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Owner's Manual Original Instructions Commercial Air Conditioners DC Inverter Multi VRF System Models: GMV-24WL/C-T(U) GMV-28WL/C-T(U)
Preface For correct installation and operation, please read all instructions carefully. Before reading the instructions, please be aware of the following items: This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey all safety messages that follow this symbol to avoid possible injury or death. This mark indicates procedures which, if improperly performed, might lead to the death or serious injury of the user. This mark indicates procedures which, if improperly performed, might possibly result in personal harm to the user, or damage to property. NOTICE is used to address practices not related to personal injury. (1) The design standard of multi VRF system conforms to related standard of sales countries. (2) To ensure safety when operating this system, please strictly follow the instructions in this manual. (3) The total capacity of running indoor units must not exceed that of the outdoor units. Otherwise, the cooling (heating) effect of each IDU would be poor. (4) Make sure that this manual is kept by direct operators and maintainers. (5) If the product needs to be installed, moved or maintained, please contact our designated dealer or local service center for professional support. Users should not disassemble or maintain the unit by themselves, otherwise it may cause relative damage, and our company will bear no responsibilities. (6) All the illustrations and information in the instruction manual are only for reference. In order to make the product better, we will continuously conduct improvement and innovation. If there is adjustment in the product, please subject to actual product. (7) Under the standby status, the unit will consume a little power for ensuring reliability of the complete unit, maintaining normal communication and preheating refrigerant. When the unit won’t be used for a long time, please cut off the power of the complete unit. However, please preheat it when operating the unit next time. User Notice DISPOSAL: Do not dispose this product as unsorted municipal waste. Collection of such waste separately for special treatment is necessary.
Manufacturer will bear no responsibilities when personal injury or property loss is caused by the following reasons: (1) Damage the product due to improper use or misuse of the product. (2) Alter, change, maintain or use the product with other equipment without abiding by the instruction manual of manufacturer. (3) After verification, the defect of product is directly caused by corrosive gas. (4) After verification, defects are due to improper operation during transportation of product. (5) Operate, repair, maintain the unit without abiding by instruction manual or related regulations. (6) After verification, the problem or dispute is caused by the quality specification or performance of parts and components that produced by other manufacturers. (7) The damage is caused by natural calamities, bad using environment or force majeure. Exception Clauses
1 Safety Precautions..................................................................................................... 1 2 Product Introduction ................................................................................................. 2 2.1 Names of Main Parts ........................................................................................................ 2 2.2 Combinations of Indoor and Outdoor Units ....................................................................... 2 2.3 Operating Range .............................................................................................................. 2 3 Preparation before Installation ................................................................................. 2 3.1 Standard Parts .................................................................................................................. 3 3.2 Installation Site ................................................................................................................. 3 3.3 Piping Work Requirements ............................................................................................... 4 4 Installation Instruction .............................................................................................. 5 4.1 Dimension of Outdoor Unit and Mounting Hole ................................................................. 5 4.2 Connection Pipe ............................................................................................................... 6 4.3 Installation of Connection Pipe.........................................................................................10 4.4 Vacuum Pumping, Refrigerant Adding .............................................................................13 4.5 Electric Wiring ..................................................................................................................15 5 Check Items after Installation and Test Operation ................................................ 17 5.1 Check Items after Installation ...........................................................................................17 5.2 Test Operation and Debugging ........................................................................................17 6 Common Malfunctions and Troubleshooting ........................................................ 22 7 Error Indication ........................................................................................................ 24 8 Maintenance and Care ............................................................................................. 26 8.1 Outdoor Heat Exchanger .................................................................................................27 8.2 Drain Pipe ........................................................................................................................27 8.3 Notice before Seasonal Use ............................................................................................27 8.4 Maintenance after Seasonal Use .....................................................................................27 8.5 Parts Replacement ..........................................................................................................27 9 After-sales Service ................................................................................................... 27 Contents
1 Safety Precautions (1) This product can’t be installed at corrosive, inflammable or explosive environment or the place with special requirements, such as kitchen. Otherwise, it will affect the normal operation or shorten the service life of the unit, or even cause fire hazard or serious injury. As for above special places, please adopt special air conditioner with anti-corrosive or anti-explosion function. (2) Follow this instruction to complete the installation work. Please carefully read this manual before unit startup and service. (3) Wire size of power cord should be large enough. The damaged power cord and connection wire should be replaced by exclusive cable. (4) After connecting the power cord, please fix the electric box cover properly in order to avoid accident. (5) Never fail to comply with the nitrogen charge requirements. Charge nitrogen when welding pipes. (6) Never short-circuit or cancel the pressure switch to prevent unit damage. (7) Please firstly connect the wired controller before energization, otherwise wired controller can not be used. (8) Before using the unit, please check if the piping and wiring are correct to avoid water leakage, refrigerant leakage, electric shock, or fire etc. (9) Do not insert fingers or objects into air outlet/inlet grille. (10) Open the door and window and keep good ventilation in the room to avoid oxygen deficit when the gas/oil supplied heating equipment is used. (11) Never start up or shut off the air conditioner by means of directly plug or unplug the power cord. (12) Turn off the unit after it runs at least five minutes; otherwise it will influence oil return of the compressor. (13) Do not allow children operate this unit. (14) Do not operate this unit with wet hands. (15) Turn off the unit or cut off the power supply before cleaning the unit, otherwise electric shock or injury may happen. (16) Never spray or flush water towards unit, otherwise malfunction or electric shock may happen. (17) Do not expose the unit to the moist or corrosive circumstances. (18) Under cooling mode, please don't set the room temperature too low and keep the temperature difference between indoor and outdoor unit within 5℃ (41℉). (19) User is not allowed to repair the unit. Fault service may cause electric shock or fire accidents. Please contact our designated dealer or local service center for help. (20) Before installation, please check if the power supply is in accordance with the requirements specified on the nameplate. And also take care of the power safety. (21) Installation should be conducted by dealer or qualified personnel. Please do not attempt to install the unit by yourself. Improper handling may result in water leakage, electric shock or fire disaster etc. (22) Be sure to use the exclusive accessory and part to prevent the water leakage, electric shock and fire accidents. (23) Make sure the unit can be earthed properly and soundly after plugging into the socket so as to avoid electric shock. Please do not connect the ground wire to gas pipe, water pipe, lightning rod or telephone line. (24) Electrify the unit 8 hours before operation. Please switch on for 8 hours before operation. Do not cut off the power when 24 hours short-time halting (to protect the compressor). (25) If refrigerant leakage happens during installation, please ventilate immediately. Poisonous gas will emerge if the refrigerant gas meets fire. (26) Volatile liquid, such as diluent or gas will damage the unit appearance. Only use soft cloth with a little neutral detergent to clean the outer casing of unit. (27) If anything abnormal happens (such as burning smell), please power off the unit and cut off the main power supply, and then immediately contact our designated dealer or local service center. If abnormality keeps going, the unit might be damaged and lead to electric shock or fire. If the product needs to be installed, moved or maintained, please contact our designated dealer DC Inverter Multi VRF System 1
DC Inverter Multi VRF System or local service center for professional support, otherwise our company would bear no legal reliability for the related damages arising therefrom. 2 Product Introduction Gree Multi VRF System adopts inverter compressor technology. By changing the displacement of compressor, stepless capacity regulation within range of 10%~100% can be realized. Various product lineups are provided with capacity range from 7kW to 8kW, which can be widely used in residential, commercial and working area and especially applicable to places with big load change. Gree residential air conditioner is absolutely your best choice. 2.1 Names of Main Parts No. ① ② ③ ④ ⑤ Name Motor Fan blade Electric box assembly Gas pipe valve Liquid pipe valve 2.2 Combinations of Indoor and Outdoor Units (1) See below the number of indoor units that can be connected to the outdoor unit. (2) The total capacity of indoor units should be within 50%~135% of that of the outdoor unit. Model Max sets of connectable IDUS GMV-24WL/C-T(U) 4 GMV-28WL/C-T(U) 4 (3) Can be connected to various indoor units. When any one of the indoor units receives operating command, outdoor unit will start operation as per required capacity. When all indoor units stop, outdoor unit will be shut off. 2.3 Operating Range Cooling Outdoor temperature: -5°C~48°C(23°F~118°F) Heating Outdoor temperature: -20°C~27°C(-4°F~81°F) 3 Preparation before Installation Graphics here are only for reference. Please refer to actual products. Unspecified dimensions are all in mm/inch. Fig.1 2
3.1 Standard Parts Please use the supplied standard parts as required. No. Name Appearance Qty Remark 1 User Manual 1 — 2 Wiring (match with resistance) 1 Must be connected to the last IDU of communication connection 3 Corrugated pipe 1 — 4 Chassis gluey plug 3 — 5 Drainage joint 1 — 6 Tube Connector Sub-assy 1 GMV-24WL/C-T(U) GMV-28WL/C-T(U) Some accessories are not available for some models. Please refer to the present product for details. 3.2 Installation Site (1) The unit must be installed where strong there is a danger the weight of the unit and fixed securely, otherwise the unit would topple or fall off. (2) Do not install where there is a danger of combustible gas leakage. (3) Do not install the unit near heat source, steam, or flammable gas. (4) Children under 10 years old must be supervised not to operate the unit. (5) Select a location which is out of children’s reach. Keep the unit away from children. (6) Make sure the location has space for heat exchange and maintenance so that unit can operate reliably with good ventilation. (7) Install the unit where it will not be tilted by more than 5°. (8) During installation, if the outdoor unit has to be exposed to strong wind, it must be fixed securely. (1) If possible, do not install the unit where it will be exposed to direct sunlight (If necessary, install a blind that does not interfere with the air flow). (2) Install ODU in a place where it will be free from getting dirty or getting wet by rain as much as possible. (3) Install ODU where it is convenient to connect IDU. (4) ODU and IDU should stay as close as possible to shorten the length of refrigerant pipe and reduce bend angles. (5) Install ODU where the condensate water can be drained out freely during heating operation. Do not place animals and plants in the path of the warm air. (6) Take the air conditioner weight into account and select a place where noise and vibration are small. DC Inverter Multi VRF System Parts for Outdoor Unit 3
DC Inverter Multi VRF System If the ODU is totally surrounded by walls, please refer to the following figures for space dimension: Fig. 2 3.3 Piping Work Requirements Refer to the table below for piping work requirements: R410A Refrigerant System Outer diameter (mm/inch) Wall thickness (mm/inch) Φ6.35 (1/4) ≥0.8(1/32) Φ9.52 (3/8) ≥0.8(1/32) Φ12.70 (1/2) ≥0.8(1/32) Φ15.9(5/8) ≥1.0(1/25) Φ19.05 (3/4) ≥1.0(1/25) 4 Unit: mm(inch)
4 Installation Instruction Graphics here are only for reference. Please refer to actual products. Unspecified dimensions are all in mm/inch. 4.1 Dimension of Outdoor Unit and Mounting Hole Unit Outline and Installation Dimension (mm/inch). Model A B C D E 395 (15-5/9) GMV-24WL/C-T(U) GMV-28WL/C-T(U) DC Inverter Multi VRF System Fig.3 Unit: mm/inch 980 (38-6/19) 360 (14-3/16) 790 (31-2/16) 650 (25-3/5) 5
DC Inverter Multi VRF System 4.2 Connection Pipe 4.2.1 Schematic Diagram of Piping Connection Fig.4 6
4.2.2 Allowable Length and Height Difference of Connection Pipe Y type branch joint is adopted to connect indoor and outdoor units. Connecting method is shown in the figure below: Equivalent length of one Y-type branch is 0.5m(1-5/8feet). Fig.5 Allowable Length and Height Difference of Connection Pipe Piping parameters of GMV-24WL/C-T(U), GMV-28WL/C-T(U). Allowable value Fitting pipe m feet Total length (actual length) of fitting pipe 250 820 L1+L2+L3+a+b+c+d Actual length 100 328 L1+L2+L3+d Equivalent Length of farthest fitting pipe (m) length 120 394 From the 1st branch to the farthest indoor pipe 40 131 L2+L3+d ODU at upper side 30 98 —— Height difference between ODU and IDU ODU at lower side 30 98 —— Height difference between IDUs 10 33 —— 7 DC Inverter Multi VRF System
DC Inverter Multi VRF System 4.2.3 Dimension of Pipe (Main Pipe) from ODU to the 1st Indoor Branch Dimension of pipe from ODU to the 1st indoor branch will be determined by the dimension of outdoor connection pipe. Dimension of outdoor connection pipe. Basic module GMV-24WL/C-T(U) Φ15.9(5/8) Φ9.52(3/8) GMV-28WL/C-T(U) Φ15.9(5/8) Φ9.52(3/8) 4.2.4 Selection of Indoor Branches Select indoor branches according to the total capacity of downstream indoor units. If the capacity exceeds that of the outdoor unit, capacity of outdoor unit prevails. R410A Refrigerant system Total capacity of downstream indoor units X (kW) Model Y type branch 135<X FQ04 Fig.6 Pipe dimension Gas pipe (mm/inch) Liquid pipe (mm/inch) Fig.7 X<20 FQ01A 20≤X≤30 FQ01B 30<X≤70 FQ02 70<X≤135 FQ03 8
4.2.5 Dimension of Pipe between Indoor Branches Select pipe between indoor branches according to the capacity of downstream indoor units; if the capacity exceeds that of the outdoor unit, capacity of outdoor unit prevails. Total capacity of downstream indoor units C (kW) Gas pipe (mm/inch) Liquid pipe (mm/inch) C≤5.6 Φ12.7(1/2) Φ6.35(1/4) 5.6<C≤14.2 Φ15.9(5/8) Φ9.52(3/8) 14.2<C≤22.4 Φ19.05(1/4) Φ9.52(3/8) 4.2.6 Dimension of Pipe between Indoor Branch and IDU Dimension of pipe between indoor branch and IDU should be consistent with the dimension of indoor pipe. Rated capacity of IDU C(Btu/h) Gas pipe (mm/inch) Liquid pipe (mm/inch) C≤9600 Φ9.52(3/8) Φ6.35(1/4) 9600<C≤17000 Φ12.7(1/2) Φ6.35(1/4) 17000<C≤48000 Φ15.9(5/8) Φ9.52(3/8) 48000<C≤55000 Φ19.05(3/4) Φ9.52(3/8) 55000<C≤96000 Φ22.2(7/8) Φ9.52(3/8) If the distance between IDU and its nearest branch is over 10m, then the liquid pipe of IDU (rated capacity ≤17000 Btu/h) shall be enlarged. DC Inverter Multi VRF System Fig. 8 Fig. 9 9
DC Inverter Multi VRF System
4.3 Installation of Connection Pipe
4.3.1 Precautions for the Installation of Connection Pipe
(1)
Conform to the following principles during pipe connection: Connection pipe should be as
short as possible, so is the height difference between indoor and outdoor units. Keep the
number of bends as little as possible. Radius of curvature should be as large as possible.
(2)
Weld the connection pipe between indoor and outdoor units. Please strictly follow the
requirements for welding process. Rosin joint or pin hole is not allowed.
(3)
Radius of bending parts should be over 200mm(8inch). Note that pipes cannot be
repeatedly bent or stretched; otherwise the material will get harder. Do not bend or stretch
the pipe for more than 3 times at the same position.
4.3.2 Flaring Process
(1)
Use pipe cutter to cut the connection pipe in case it is unshaped.
(2)
Keep the pipe downward in case cutting scraps get into the pipe. Clear away the burrs after
cutting.
(3)
Remove the flared nut connecting indoor connection pipe and outdoor unit. Then use flaring
tool to fix the flared nut into the pipe (as shown in Fig.10).
(4)
Check if the flared part is flaring evenly and if there is any crack.
4.3.3 Pipe Bending
(1)
Reshape the pipe by hand. Be careful not to damage the pipe.
Fig. 11 Fig. 12
(2)
Do not bend the pipe over 90°.
(3)
If pipe is repeatedly bent or stretched, it will get hard and difficult to bend and stretch again.
Therefore, do not bend or stretch the bend for over 3 times.
(4)
In case that direct bending will open cracks to the pipe, first use sharp cutter to cut the
insulating layer, as shown in Fig.12. Do not bend the pipe until it is exposed. When bending
is done, wrap the pipe with insulating layer and then secure it with adhesive tape.
Fig. 10
10 4.3.4 Indoor Pipe Connection (1) Remove pipe cover and pipe plug. (2) Direct the flared part of copper pipe to the center of screwed joint. Twist on the flared nut tightly by hand, as in Fig.13 (Make sure indoor pipe is correctly connected. Improper location of the center will prevent flared nut from being securely twisted. Thread of nut will get damaged if the flared nut is twisted forcibly). (3) Use torque wrench to twist on the flared nut tightly until the wrench gives out a click sound (Hold the handle of wrench and make it at right angle to the pipe. as in Fig.14). (4) Use sponge to wrap the un-insulated connection pipe and joint. Then tie the sponge tightly with plastic tape. (5) Connection pipe should be supported by a bearer rather than the unit. (6) The bending angle of piping should not be too small; otherwise the piping might have cracks. Please use a pipe bender to bend the pipe. (7) When connecting IDU with connection pipe, do not pull the big and small joints of IDU with force in case the capillary tube or other tubes have cracks and cause leakage. Fig. 13 Fig. 14 4.3.5 Outdoor Pipe Connection Twist the flared nut on the connection pipe of outdoor valves. Twisting method is the same as for indoor pipe connection. During engineering installation, the connection pipe inside the unit must be wrapped by insulation sleeve. Below is the piping diagram of GMV-24WL/C-T(U), GMV-28WL/C-T(U). According to customer requirement or space limit, outlet pipe can be installed from the front, right or rear side. DC Inverter Multi VRF System Pipe Diameter Tightening Torque 6mm(1/4inch) 15-30N·m(11-22ft.-1b.) 9.5mm(3/8 inch) 35-40N·m(26-29ft.-1b.) 12.7mm(1/2 inch) 45-50N·m(33-37ft.-1b.) 16mm(5/8 inch) 60-65N·m(44-48ft.-1b.) Fig.15 11
DC Inverter Multi VRF System 4.3.6 Installation of Y-type Branch (1) Y-type Branch. (2) Y-type branch has several pipe sections with different dimension, which facilitates to match with various copper pipes. Use pipe cutter to cut in the middle of the pipe section that is of proper dimension and remove burrs as well. See Fig.17. (3) Y-type branch must be installed vertically or horizontally. (4) Branch shall be isolated by insulating material that can bear 120°C(248°F) or even higher temperature. The attached foam of branch cannot be taken as insulating material. 4.3.7 Thermal Insulation for Pipeline (1) For multi VRF system, every copper pipe should be labeled so as to avoid misconnection. (2) At the branch inlet, leave at least 500mm(19-3/4inch) straight pipe section. (3) Thermal insulation for pipeline. 1) To avoid condensate or water leakage on the connection pipe, the gas pipe and liquid pipe must be wrapped with thermal insulating material and adhesive tape for insulation from the air. 2) Thermal insulating material shall be able bear the pipe temperature. For heat pump unit, liquid pipe should bear 70°C(158°F) or above and gas pipe should bear 120°C(248°F) or above. For cooling only unit, both liquid pipe and gas pipe should bear 70°C (158°F) or above. 3) Example: Polyethylene foam (bear 120°C(248°F) or above); foaming polyethylene Fig. 16 Fig. 17 12
(bear 100°C(212°F) or above). 4) Joints of indoor and outdoor unit should be wrapped with insulating material and leave no gap between pipe and wall. See Fig.18. Fig. 18 5) Thermal insulating material of branches should be the same as that of the pipeline. The attached foam of branches cannot be taken as insulating material. 6) When wrapping the tape, the later circle should cover half of the former one. Don’t wrap the rape too tight, otherwise the insulation effect will be weakened. 7) After wrapping the pipe, apply sealing material to completely seal the hole on the wall. 4.3.8 Support and Protection of Pipeline (1) Support should be made for hanging connection pipe. Distance between each support cannot be over 1m. (2) Protection against accidental damage should be made for outdoor pipeline. When pipeline exceeds 1m, a pinch board should be added for protection. 4.4 Vacuum Pumping, Refrigerant Adding 4.4.1 Vacuum Pumping (1) Outdoor unit has been charged with refrigerant before delivery. Field-installed connection pipe needs to be charged with additional refrigerant. (2) Confirm whether outdoor liquid and gas valves are closed. (3) Use vacuum pump to withdraw the air inside indoor unit and connection pipe from the outdoor valve, as shown below. DC Inverter Multi VRF System Fig. 19 13
DC Inverter Multi VRF System 4.4.2 Refrigerant Adding (1) Refrigerant quantity of outdoor unit before delivery: Model GMV-24WL/C-T(U), GMV-28WL/C-T(U) Refrigerant Qty (kg) 2.4 (1) The refrigerant amount charged before delivery doesn’t include the amount that needs to be added to indoor units and the connection pipeline. (2) Length of connection pipe is decided on site. Therefore the amount of additional refrigerant shall be decided on site according to the dimension and length of field-installed liquid pipe. (3) Record the amount of additional refrigerant for convenience of after-sales service. (2) Calculation of the amount of additional refrigerant. Calculation method of the quantity of additional refrigerant (based on liquid pipe) Quantity of additional refrigerant = ∑length of liquid pipe × quantity of additional refrigerant per meter(39-3/8inch) +(quantity of indoor unit -2) ×0.3 Quantity of additional refrigerant per meter for liquid pipe (kg/m)/(oz/inch) Φ22.2(Φ7/8) Φ19.05(Φ3/4) Φ15.9(Φ5/8) Φ12.7(Φ1/2) Φ9.52(Φ3/8) Φ6.35(Φ1/4) 0.35 0.25 0.17 0.11 0.054 0.022 0.314 0.224 0.152 0.099 0.048 0.020 First confirm that there is no leakage from the system. When compressor is not working, charge additional R410A with specific amount to the unit through the filling opening of the liquid pipe valve of the outdoor unit. If required amount cannot be quickly filled due to pressure increase of the pipe, then set the unit in cooling startup and fill refrigerant from the low pressure check valve of the outdoor unit. (3) Calculation example. Fig. 20 IDU: No. IDU ① IDU ② IDU ③ IDU ④ Model Duct type GMV-ND72PL/B-T Duct type GMV-ND50PL/B-T Duct type GMV-ND36PL/B-T Liquid pipe: No. A B C D Pipe size Φ9.52(Φ3/8) Φ9.52(Φ3/8) Φ9.52(Φ3/8) Φ6.35(Φ1/4) 14 Duct type GMV-ND25PL/B-T
Length 10m(32-3/4feet) 5m(16-3/8feet) 5m(16-3/8feet) 5m(16-3/8feet) No. a b c d Pipe size Φ9.52(Φ3/8) Φ6.35(Φ1/4) Φ6.35(Φ1/4) Φ6.35(Φ1/4) Length 3m(9-3/4feet) 3m(9-3/4feet) 2m(6-5/8feet) 1m(3-1/4feet) Total length of each liquid pipe Φ9.52: A+B+C+a=10+5+5+3=23m (75-1/2 feet) Φ6.35: D+b+c+d=5+3+2+1=11m(36feet) Quantity of indoor unit: 4 sets Therefore, the minimum quantity of additional refrigerant = (23×0.054+11×0.022) +(4-2) ×0.3= 2.084kg 4.5 Electric Wiring 4.5.1 Notices for Wiring (1) Install units according to national wiring codes. (2) Use air conditioner specialized power supply and make sure that it is consistent with system’s rated voltage. (3) Do not pull the power cord with force. (4) All electrical installation must be performed by qualified technicians in accordance with local laws, regulations and this user manual. (5) Caliber of the power cord must be large enough. A damaged power cord or connection wire must be replaced by specialized electrical cords. (6) If the supply cord is damaged, it must be replaced by the manufacturer or its service agent or a similarly qualified person in order to avoid a hazard. (7) An all-pole disconnection device which has at least 3mm (3/25 inch) clearances in all poles, and disconnection must be incorporated in the fixed wiring in accordance with the wiring rules. (8) Details of type and rating for fuse: Model: GMV-24WL/C-T(U), GMV-28WL/C-T(U). Ceramic 250V5A (front main board), ceramic 250V30A (front main board). Connect the unit to specialized grounding device and make sure it is securely grounded. It’s a must to install air switch and current circuit breaker that can cut off the power of the entire system. The circuit breaker should include magnetic trip function and thermal trip function so that system can be protected from short circuit and overload. (9) Grounding Requirements. 1) Air conditioner belongs to class I electrical appliance, so it must be securely grounded. 2) The yellow-green wire inside the unit is a ground wire. Do not cut it off or secure it with tapping screws, otherwise it will lead to electric shock. 3) Power supply must include secure grounding terminal. Do not connect the ground wire to the following: ①Water pipe; ②Gas pipe; ③Drain pipe; ④Other places that are deemed as not secure by professional technicians. DC Inverter Multi VRF System 15
DC Inverter Multi VRF System 4.5.2 Wiring Diagram (1) Connection of power cord and communication wire Separate power supply for IDU and ODU Single-phase power supply unit. GMV-24WL/C-T(U), GMV-28WL/C-T(U): Fig.21 Connection of power cord and communication wire for IDU and ODU (2) Selection of circuit breaker and power cord. Model Power supply GMV-24WL/C-T(U) 208/230V~ 60Hz 25 25 21 GMV-28WL/C-T(U) 208/230V~ 60Hz 30 30 21 (1) Selection of circuit breaker and power cord in the above table is based upon unit’s maximum power (maximum current). (2) Specification of power cord is based on the working condition where ambient temperature is 40°C (104°F) and multi-core copper cable (working temperature is 90°C (194°F), e.g. power cable with YJV cross-linked copper, insulated PE and PVC sheath) is lying on the surface of slot. If working condition changes, please adjust the specification according to national standard. (3) Specification of circuit breaker is based on the working condition where ambient temperature of circuit breaker is 40°C (104°F). If working condition changes, please adjust the specification according to national standard. 4.5.3 Engineering Wiring of Power Supply and Communication Cable (1) Please refer Fig. 22 for engineering wiring. If there is the hole for cable tie in wiring route, please fix the wire with cable tie. Connect the power cord and communication cable to the corresponding terminal board and grounding screw according to the wiring diagram. (2) Please be noted that engineering wiring cannot touch the pipe and appliance. (3) This figure is only applicable for engineering wiring reference of power supply and communication cable. If there are differences between the figure structure and actual unit, please refer to the actual unit. Max Fuse Size/Fusible Max. Max Ckt, Bkr Size/Disjoncteur Max. Min. Circuit Ampacity (A) (A) (A) 16
(4) For engineering wiring, please refer to the wiring diagram provided with the unit. Fig. 22 Engineering Wiring View of GMV-24WL/C-T(U), GMV-28WL/C-T(U) 5 Check Items after Installation and Test Operation 5.1 Check Items after Installation Check items Possible conditions due to improper installation Check Each part of the unit is installed securely? Unit may drop, shake or emit noise. Gas leakage test is taken or not? Insufficient cooling (heating) capacity. Unit gets proper thermal insulation or not? There may be condensation and dripping. Drainage is smooth or not? There may be condensation and dripping. Is the voltage in accordance with the rated voltage specified on the nameplate? Is the electric wiring and pipe connection installed correctly? Unit is securely grounded or not? Electrical leakage. Power cord meets the required specification? Unit may have malfunction or components may get damaged. Is the air inlet/outlet blocked? Insufficient cooling (heating) capacity. Length of refrigerant pipe and the charging amount of refrigerant are recorded or not? The refrigerant charging amount is not accurate. Binding pieces on compressor feet are removed or not? Compressor may get damaged. 5.2 Test Operation and Debugging (1) After finishing the first installation or replacing the main board of outdoor unit, it is necessary to perform test operation and debugging. Otherwise, unit won’t be able to work. (2) Test operation and debugging must be performed by professional technicians or under the guidance of professional technicians. 5.2.1 Prepare the Test Operation and Debugging (1) Do not connect power until all installation work is finished. (2) All control circuits and wires are correctly and securely connected. (3) Check whether the fixing loops for compressor foots are removed. (4) All small pieces, especially metal chips, thread ends and forceps holder, must be removed from the unit. DC Inverter Multi VRF System Unit may have malfunction or components may get damaged. Unit may have malfunction or components may get damaged. 17
DC Inverter Multi VRF System (5) Check whether unit’s appearance and pipeline system has been damaged during transportation. (6) Calculate the quantity of refrigerant that needs to be added according to the pipe length. Pre-charge the refrigerant. In case that the required charging quantity is not reached while refrigerant can’t be added, record the quantity of refrigerant that still needs to add and complement the quantity during test operation. For details of adding refrigerant during test operation, see below. (7) After refrigerant is added, make sure valves of outdoor unit are completely open. (8) For the convenience of troubleshooting during debugging, unit shall be connected to a PC with applicable debugging software. Make sure unit’s real-time data can be checked through this computer. The installation and connection of debugging software can be found in the Service Manual. (9) Before test operation, make sure unit is power on and compressor has been preheated for more than 8 hours. Touch the unit to check whether it’s normally preheated. If yes, start test operation. Otherwise, compressor might be damaged. 5.2.2 Test Operation and Debugging Description of test operation procedures and main board display of ODU. Description of each stage of debugging progress —— Debugging code Code meaning and operation method Progress LED Code Display status A0 ON System is not debugged, hold main board’s SW3 button for 5s to start debugging. 01_Set master unit 01 ON 2s later, next step starts. 02/Ad Display circularly System is allocating addresses. 10s later, display as below: No master indoor unit. Display will be on for 1min, during which master IDU can be set manually. If not, system will set the unit with minimum IP address as the master IDU. 02_ Allocate addresses 02/L7 Display circularly 02/oC Display circularly Allocation is finished. 2s later, next step starts. 03_ Confirm the quantity of ODU 03/01 Display circularly System is confirming. 1s later, next step starts. “00~16” displays the quantity of indoor unit. Confirm the number manually. If the number is not consistent the display one, cut off power of IDU and ODU and check whether communication wire of IDU is correctly connected. After the check, connect power and start debugging from progress 01. If the number is then correct, press main board’s SW3 button to confirm. Then the display is as below: 04/00~16 Display circularly 04_ Confirm the quantity of IDU 04/oC Display circularly System has confirmed the quantity. 2s later, next step starts. 18
Description of each stage of debugging progress —— Debugging code Code meaning and operation method Progress LED Code Display status Communication between master ODU and driver has error. Check the communication connection of ODU’s main board and drive board. When the error is eliminated, start next step. If power is off during troubleshooting, then restart debugging from progress 01 after power is on. 05/C2 Display circularly Communication of master ODU and driver is normal. Unit will display as in the left for 2s and detect the capacity ratio of IDU and ODU. If the ratio is within range, then next step will start 2s later. If the ratio is out of range, unit will display as below: 05_ Detect ODU’s internal communication and capacity ratio 05/oC Display circularly Rated capacity ratio of IDU is too high. Change the combination way of IDU and ODU to make the ratio within range. And restart debugging from progress 01. 05/CH Display circularly Rated capacity ratio of IDU is too low. Change the combination way of IDU and ODU to make the ratio within range. And restart debugging from progress 01. 05/CL Display circularly Outdoor component’s error. Besides “06”, the other blinking will display the related error code. After errors are eliminated, system will start next step automatically. If power is off during troubleshooting, then restart debugging from progress 01 after power is on. 06/error code Display circularly 06_ Detect outdoor components 06/oC Display circularly System detects no error on outdoor component. 10s later, next step starts. System detects error on indoor components. XX means the project code of IDU with error, e.g. no.1 IDU has d5 and d6 errors, meanwhile no.3 IDU displays error d6 and d7, then the nixie tube will display “07”, “01”, “d5”, “d6” and “03” circularly. After errors are eliminated, system will start next step automatically. If power is off during troubleshooting, then restart debugging from progress 01 after power is on. 07/XX/error code Display circularly 07_ Detect indoor components If errors occur in IDU which the project code is ≥ 3-digit number, then it will display the 2 big digits of project code first, then the 2 small digits, finally the error code, e.g: L1 error occurs in no.101 IDU, and then the nixie tube will display “01”,“01” and “L1” circularly. Display method is the same for several IDUs with multiple errors. 07/XXXX/error code Display circularly 07/oC Display circularly No error on components of IDU. 5s later, next step starts. Preheat time for compressor is less than 8 hours. Display will be as in the left until the preheat time reaches 8 hours. Press main board’s SW3 button to confirm manually that the preheat time has reached 8 hours. Then start next step (Note: Compressor may get damaged if it is started without 8 hours of preheat time). 08/U0 Display circularly 08_ Confirm preheated compressor 08/oC Display circularly Compressor has been preheated for 8 hours. 2s later, next step starts. System is lack of refrigerant and display will be as in the left. Please cut off power of IDU and ODU and check if there is leakage on pipeline. Solve the leakage problem and complement refrigerant into the unit. Then connect power and restart debugging from progress 01 (Note: Before re-charging refrigerant, unit must be power off in case system starts progress 10 automatically). 09/U4 Display circularly 09_ Refrigerant judgments before startup 09/oC Display circularly Refrigerant is normal and unit will display as in the left for 2s. Then next step starts. 19 DC Inverter Multi VRF System
DC Inverter Multi VRF System Description of each stage of debugging progress —— Debugging code Code meaning and operation method Progress LED Code Display status Valves of ODU are being inspected. Compressor will start operation for 2min or so and then stop. The opening and closing status of outdoor valves are as below: 10/on Display circularly Outdoor valves are not fully turned on. Press main board’s SW4 button and display shows “09/OC”. Then check if the gas and liquid valves of ODU are completely open. After confirmation, press the SW4 button again. Then compressor will start running for about 2min to inspect the status of valves. 10_ Status judgments of outdoor valves 10/U6 Display circularly before startup 10/oC Display circularly Valves status is normal. Unit will display as in the left for 2s and then start next step. Ready for units to start debugging. Press main board’s SW3 button to confirm startup of debugging. 2s later, main board will display as below: 12/AP Display circularly Startup is confirmed. After displaying for 2s, system will choose “15_ Cooling debugging” or “16_ Heating debugging” according to ambient temperature. If the project requests to add refrigerant but it is not complemented before debugging, then refrigerant can be added in this process through the L-VALVE. 12_ Confirm debugging startup 12/AE Display circularly Debugging for cooling mode. If no malfunction occurs for 50min when compressor is running, then the system is certified as normal. After shutting down the unit for 5s, the system will enter normal standby status. 15/AC Display circularly 15_ Cooling debugging 15/error code Display circularly Malfunction occurs when debugging for cooling mode. Debugging for heating mode. If no malfunction occurs for 50min when compressor is running, then the system is certified as normal. After shutting down the unit for 5s, the system will enter normal standby status. 16/AH Display circularly 16_ Heating debugging 16/error code Display circularly Malfunction occurs when debugging for heating mode. 17_ Debugging finished oF ON The entire unit has finished debugging and under standby-by condition. 20
DC Inverter Multi VRF System 5.2.3 Appendix: Reference of normal operation parameters No Debug item Parameter name Unit Reference Outdoor temperature °C(°F) —— 1 When compressor starts, discharge temp in cool mode is within 70~105°C(158~221°F) and at least 10°C(50°F) higher than the high pressure saturation temp. As for temp in heat mode, it is within 2 Compressor discharge temp °C(°F) 65~90°C(149~194°F) and at least 10°C(50°F) higher than the high pressure saturation temp. In cool mode, defrosting temp is 4~10°C(39~50°F) lower than system’s high pressure value. In heat mode, defrosting temp is about 2°C(36°F) 3 Defrosting temp °C(°F) different from system’s low pressure value. In cool mode, the normal high pressure value is within 20°C~55°C(68~131°F). According to the change of ambient temp and system’s operating capacity, the high pressure value will be 10°C~30°C(50~86°F) higher than ambient temp. The higher ambient temp is, the smaller temp difference is. If ambient temp is 25~35°C (77~95°F) in cool mode, system’s high pressure value will be within 44~53°C(111~127°F). In heat mode, if ambient temp is above -5°C(23°F), 4 System high pressure °C(°F) ODU parameters system’s high pressure value is within 40~52°C(104~126°F). If ambient temp is low and many IDUs are turned on, the high pressure will be lower. System parameters When ambient temp in cool mode is 25~35°C(77~95°F), the low pressure value is 0~8°C(32~46°F). When ambient temp in heat mode is above -5°C(23°F), 5 System low pressure °C(°F) the low pressure value is -15~8°C(5~46°F). In cool mode, the thermal electronic expansion valve 6 Opening angle of thermal EXV PLS remains 480PLS. In heat mode, the adjustable opening angle of EXV is 40~480PLS. 7 Compressor’s operating freq Hz Changes in 10Hz~80Hz. 8 Compressor’s A When compressor works normally, the current is no more than 18.4A. operating current When ambient temp is below 35°C(95°F), IPM temp is lower than 80°C(176°F) and the highest temp won’t be above 95°C(203°F). 9 Compressor’s IPM temp °C 10 Fan motor’s operating freq Hz Changes in 0~49Hz according to system’s pressure. IDU ambient 11 temp °C(°F) —— 12 Indoor heat exchanger’s According to ambient temp, for a same IDU in cool °C(°F) mode, the inlet temp will be 1°C~7°C (34~45°F) lower than the outlet temp, and 4~9°C(39~48°F) higher than the low pressure value. For a same IDU in heat mode, the inlet temp will be inlet temp 10°C~20°C(50~68°F) lower than the outlet temp. 13 Indoor heat exchanger’s IDU parameters °C(°F) inlet temp In cool mode, the opening angle of indoor EXV varies 14 Opening angle within 70~480PLS. In heat mode, the opening angle of indoor EXV varies of indoor EXV PLS within 70~480PLS. 21
DC Inverter Multi VRF System No Debug item Parameter name Unit Reference 15 Communication Communication data — Number of IDUs detected by software is the same with the actual number. No communication error. parameters Indoor unit can drain water out completely and smoothly. Condensate pipe has no backward slope of water; Water of outdoor unit can be drained completely through drainage pipe. No water drop from unit base. 16 Drainage system —— — 17 Others —— — Compressor and indoor/outdoor fan motor do not have strange noise. Unit can operate normally. 6 Common Malfunctions and Troubleshooting (1) If an abnormal situation (such as peculiar smell) occurs, please stop the operation immediately and turn off the main power supply, and then contact Gree authorized maintenance center. If the unit continues to operate under abnormal situation, the air conditioner will be damaged and an electric shock or fire accident may result. (2) Do not maintain the air conditioner by yourself, misoperation may cause electric shock or fire hazard. Please contact professional personnel of Gree authorized maintenance center to maintain. ● Before asking for maintenance, please check the following issues first. (1) Please check the items below before calling for maintenance. Problems Causes What to do Fuse or circuit breaker is cut off. Replace fuse or reset the circuit breaker. Power failure. Restart unit when power is restored. Unit doesn’t work. Power supply is not connected Connect the power. Remote controller’s power is not enough. Replace new battery. Remote controller is out of the control range. Control range is within 8m. Unit runs but stops immediately. Air inlet or air outlet of indoor and outdoor units is blocked. Clear obstructions. Air inlet or air outlet of indoor and outdoor units is blocked. Clear obstructions. Improper temp setting. Adjust setting at remote controller or wired controller. Fan speed is set too low. Adjust setting at remote controller or wired controller. Abnormal cooling or heating. Wind direction is not correct. Adjust setting at remote controller or wired controller. Door or window is open. Close the door or window. Direct sunshine. Draw curtain or louver. Too many people in the room. — Too many heat resources in the room. Reduce heat resources. Filter is blocked and dirty. Clean the filter. If problem cannot be solved after checking the above items, please contact Gree service center and describe the cases and models. 22
(2) Following circumstances are not malfunctions. Malfunction Reason Unit doesn’t starts up after it is just being turned off. Unit doesn’t operate When power is turned on. Standby operating for about 1 minute. Mist comes from the unit Under cooling. Indoor high humidity air is cooled rapidly. When the power supply is connected, there is small “dada” sound. It is the sound of startup action of electronic expansion valve. When the system is conducting cooling or defrosting, there is continuous “sa——” sound. This is the sound of refrigerant flowing inside the unit. When the system is switching cooling and heating modes; during heating operation, the unit enters or quits defrosting operation or oil return operation, there is “chi——” sound. When the system is started or stopped for a short time, you can hear the sound of “sa——”; you can also hear this sound for a short time after the start or stop of the defrosting operation. When the system is in cooling operation or after it stops running, a continuous “sa——” sound can be heard When the system is running or after it stops running, a “creaking” sound can be heard. Noise is emitted When the system is in heating operation, after the indoor unit stops running, the sound like running water can be heard. This sound can be heard when other indoor units are running. This is to prevent oil and refrigerant from staying in the indoor unit, and to keep a small amount of refrigerant flowing. When the unit is running, the operating sound of the compressor changes. When the indoor unit stops running, a faint “sa ——” sound or “gurgling” sound can be heard. This is caused by changes in compressor operating frequency. During the operation of the unit or after the operation is started or stopped, a continuous “sa——” sound can be heard. When the operating mode of the unit changes, the indoor unit and outdoor unit will produce “sa——” and "gurgling" sounds. The sound from the outdoor unit can be heard indoors There is dust blowing out from the unit Start operation after it is not used for a long time The unit emits odor Operating. The odor of the air conditioner is sucked into the room and then blown out The indoor unit is still running after shutting down The indoor unit is still running after shutting down DC Inverter Multi VRF System Overload protection switch makes it run after 3 minutes delay. This is the sound for direction reversal of 4-way valve. This is the sound produced when the refrigerant stops or changes the flow. This is the operation sound of drain system. This is the sound produced when plastic parts such as panels expansion and contraction due to temperature changes. The unit is melting the frost on the outdoor unit, please wait about 10 minutes (due to different unit models, the waiting time will vary). This is the sound produced when the refrigerant bypass valve operates. This is the sound produced when the refrigerant stops or changes flow. This is because the outdoor unit is installed close to the window or wall, and the sound insulation is poor, and the external noise is transmitted in. Dust in indoor unit is blew out. The fan of indoor unit will continue to work for 20 to 70 seconds to fully use the residual cooling or heat of the heat exchanger, and to prepare for the next use. 23
DC Inverter Multi VRF System Malfunction Reason When the selected operation mode of the indoor unit conflicts with the operation mode of the outdoor unit, after five seconds, the indoor unit error indicator flashes or the remote controller displays the operation conflict, and the indoor unit shuts down. At this time, the indoor unit can be converted to run with the outdoor unit. The mode can be restored to normal without conflict. The cooling mode and dry mode do not conflict, and the air supply does not conflict with any mode. 7 Error Indication Mode conflict Cooling or heating mode cannot start up Inquiry method of error indication: combine division symbol and content symbol to check the corresponding error. Indoor: Error Code Content Error Code Content L0 Malfunction of IDU (uniform) d1 Indoor PCB is poor L1 Protection of indoor fan d3 Malfunction of ambient temperature sensor L2 Auxiliary heating protection d4 Malfunction of entry-tube temperature sensor L3 Water-full protection d5 Malfunction of middle temperature sensor L4 Abnormal power supply for wired controller d6 Malfunction of exit-tube temperature sensor L5 Freeze prevention protection d7 Malfunction of humidity sensor L6 Mode shock d9 Malfunction of jumper cap L7 No main IDU dA Web address of IDU is abnormal L8 Power supply is insufficient dH PCB of wired controller is abnormal L9 1-to-more: number of IDU is inconsistent dC Setting capacity of DIP switch code is abnormal LA t1-to-more: IDU series is inconsistent dL Malfunction of air outlet temperature sensor LH Alarm due to bad air quality (Fresh air unit) dE Malfunction of indoor CO2 sensor LC IDU is not matching with outdoor unit db Debugging status Outdoor: Error Code Content Error Code Content E0 Malfunction of ODU (uniform) F0 Main board of ODU is poor E1 High-pressure protection F1 Malfunction of high-pressure sensor E2 Discharge low-temperature protection F3 Malfunction of low-pressure sensor E3 Low-pressure protection F5 Malfunction of discharge temperature sensor of compressor 1 E4 High discharge temperature protection of compressor FP Malfunction of DC motor E5 High discharge temperature protection of compressor 1 b1 Malfunction of outdoor ambient temperature sensor EC Drop protection of discharge temperature sensor of compressor 1 b2 Malfunction of defrosting temperature sensor 1 J1 Over-current protection of compressor 1 b4 Malfunction of liquid temperature sensor of sub-cooler 24
Error Code Content Error Code Content J7 Gas-mixing protection of 4-way valve b5 Malfunction of gas temperature sensor of sub-cooler J8 High pressure ratio protection of system b6 Malfunction of inlet tube temperature sensor of vapor liquid separator J9 Low pressure ratio protection of system b7 Malfunction of exit tube temperature sensor of vapor liquid separator JA Protection because of abnormal pressure b9 Malfunction of gas temperature sensor of heat exchanger JL Protection because high pressure is too low bH Clock of system is abnormal P0 malfunction of driving board of compressor (uniform) H0 Malfunction of driving board of fan (uniform) P1 Driving board of compressor operates abnormally (uniform) H1 Driving board of fan operates abnormally (uniform) P2 Voltage protection of driving board power of compressor (uniform) H2 Voltage protection of driving board power of fan (uniform) P3 Reset protection of driving module of compressor H3 Reset protection of driving module of fan P4 Drive PFC protection of compressor H4 Drive PFC protection of fan P5 Over-current protection of inverter compressor H5 Over-current protection of inverter fan P6 Drive IPM module protection of compressor H6 Drive IPM module protection of fan P7 Malfunction of drive temperature sensor of compressor H7 Malfunction of drive temperature sensor of fan P8 Drive IPM high temperature protection of compressor H8 Drive IPM high temperature protection of fan P9 Desynchronizing protection of inverter compressor H9 Desynchronizing protection of inverter fan PH High-voltage protection of compressor’s drive DC bus bar HH High-voltage protection of fan’s drive DC bus bar PC Malfunction of current detection circuit drive of compressor HC Malfunction of current detection circuit of fan drive PL Low voltage protection for DC bus bar of drive of compressor HL Low voltage protection of bus bar of fan drive PE Phase-lacking of inverter compressor HE Phase-lacking of inverter fan PF Malfunction of charging loop of driven of compressor HF Malfunction of charging loop of fan drive PJ Failure startup of inverter compressor HJ Failure startup of inverter fan PP AC current protection of inverter compressor HP AC current protection of inverter fan Ed Low temperature protection for drive module Debugging: Error Code Content Error Code Content U0 Preheat time of compressor is insufficient C4 Malfunction of lack of IDU U2 Wrong setting of ODU’s capacity code/jumper cap C5 Alarm because project code of IDU is inconsistent U4 Refrigerant-lacking protection C8 Emergency status of compressor U5 Wrong address for driving board of compressor C9 Emergency status of fan U6 Alarm because valve is abnormal CH Rated capacity is too high U8 Malfunction of pipeline for IDU CC Malfunction of lack of main control unit U9 Malfunction of pipeline for ODU CL Rated capacity is too low UC Setting of main IDU is successful CF Malfunction of multiple main control units DC Inverter Multi VRF System 25
DC Inverter Multi VRF System Error Code Content Error Code Content UL Wrong button-dial CJ Address DIP switch code of system is shocking UE Charging of refrigerant is invalid CP Malfunction of multiple wired controller C0 Communication malfunction between IDU, ODU and IDU’s wired controller CU Communication malfunction between IDU and the receiving lamp plate Communication malfunction between main control and inverter compressor driver C2 C3 Communication malfunction between main control and inverter fan driver — — Status: Error Code Content Error Code Content A0 Unit waiting for debugging AP Debugging confirmation when starting up the unit A1 Inquiry of compressor operation parameters AU Long-distance emergency stop A2 Refrigerant recovery operation of after-sales Ab Emergency stop of operation A3 Defrosting Ad Limit operation A4 Oil-return n0 SE operation setting of system A6 Heat pump function setting n1 Setting of defrosting cycle K1 A7 Quiet mode setting n2 Setting of upper limit of IDU/ODU capacity distribution ratio A8 Vacuum pump mode n4 Limit setting for max. capacity/output capacity A9 IPLV test n6 Inquiry of malfunction AA EU AA level EER test mode n7 Inquiry of parameters AH Heating n8 Inquiry of project code of IDU AC Cooling nA Heat pump unit AL Charge refrigerant automatically nH Heating only unit AE Charge refrigerant manually nC Cooling only unit AF Fan nE Negative code AJ Cleaning reminding of filter nF Fan model q1 Anti-ice temperature setting under low temperature condition qA Heat recover status q2 Shield setting for compressor frequency qH main body conducts heating q3 Upper limit of correction value for target low pressure is Z0 qC The main body conducts cooling q4 Upper limit of correction value for target low pressure is Z2 qL Static pressure setting Setting for general unit and high sensible heat unit (0 represents general, 1 represents high sensible heat) q5 q6 Setting for engineering ability correction factor θ qF Compulsory cooling mode q7 Select Centigrade or Fahrenheit qJ Dual heat source water emptying q8 Low temperature protection correction value for discharge qy Working mode of compressor heating zone q9 Defrost mode setting 8 Maintenance and Care Regular check, maintenance and care can extend unit’s service life. Please have specialized person in charge of the management of air conditioners. Cb Overflow distribution of IP address qE EVI operation status setting 26
8.1 Outdoor Heat Exchanger Outdoor heat exchanger shall be cleaned regularly, which is at least once every two months. You can use a dust catcher with nylon brush to clean away the dust on the heat exchanger. If compressed air source is available, it also can be used to clean the heat exchanger. Do not clean it with water. 8.2 Drain Pipe Please check regularly whether drain pipe is blocked or not. Make sure condensate can be drained out smoothly. 8.3 Notice before Seasonal Use (1) Check whether air inlets and air outlets of indoor and outdoor units are blocked. (2) Check whether ground connection is reliable or not. (3) Check whether batteries in the remote controller are replaced or not. (4) Check whether air filter is properly installed. (5) If unit starts up after not operating for a long time, it should be power on 8 hours before operation starts so as to preheat the outdoor compressor. (6) Check whether outdoor unit is securely installed. If there is any problem, please contact Gree authorized service center. 8.4 Maintenance after Seasonal Use (1) Disconnect power of the entire system. (2) Clean the air filter and outer case of indoor and outdoor units. (3) Clean away the dust and obstacles on indoor and outdoor units. (4) If outdoor unit has rust, please apply some paint to it so as to prevent the rust from growing. 8.5 Parts Replacement Parts and components can be obtained from nearby Gree office or Gree distributor. When you are conducting air tightness test and leakage test, do not mix oxygen, C2H2 or other dangerous gas into the refrigerant circuit. Otherwise, it may lead to danger. Use nitrogen or refrigerant to conduct the tests. 9 After-sales Service If there’s quality defect or other problems in the product, please contact Gree local after-sales service department for help. Warranty must be based on the following conditions: (1) Product’s initial startup must be performed by professional technicians from Gree service center or persons assigned by Gree. (2) Only Gree spare parts are used. (3) All instructions of unit operation and maintenance in this manual must be strictly followed according to set period and set frequency. (4) Any breach of the above conditions will disable the warranty. DC Inverter Multi VRF System 27
GREE ELECTRIC APPLIANCES, INC. OF ZHUHAI Add: West Jinji Rd, Qianshan, Zhuhai, Guangdong, China, 519070 Tel: (+86-756) 8522218 Fax: (+86-756) 8669426 E-mail: global@cn.gree.com www.gree.com