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Grunaire GMU018HXB-2 Service Manual

Refrigerant r410a
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Service Manual

MODEL: GMU018HXB-2
GMU024HXB-2
GMU028HXB-3
GMU028HXB-4
(Refrigerant R410A)

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Summary of Contents for Grunaire GMU018HXB-2

  • Page 1: Service Manual

    Service Manual MODEL: GMU018HXB-2 GMU024HXB-2 GMU028HXB-3 GMU028HXB-4 (Refrigerant R410A)

  • Page 2: Table Of Contents

    ..................10 5.1 Electrical Data......................10 5.2 Electrical Wiring....................10 5.3 Printed Circuit Board.....................13 Part 6 Description of Each Control Operation ..........20 6.1 Models GMU018HXB-2,GMU024HXB-2..............20 6.2 Models GMU028HXB-3,GMU028HXB-4..............24 Part 7 Installation Manual ..................29 7.1 Installing the Outdoor Unit..................29 7.2 Bleeding.......................29 7.3 Installation Dimension Diagram................30 7.4 Check After Installation..................31...

  • Page 3: Summary And Features

    Summary and features Summary and features Model: GMU018HXB-2 GMU024HXB-2 GMU028HXB-4 GMU028HXB-3...

  • Page 4: Part 1 Safety Precautions

    Safety Precautions 1.Safety Precautions Installing, starting up, and servicing air conditioner can be Make sure the outdoor unit is installed on a stable, level hazardous due to system pressure, electrical components, and surface with no accumulation of snow, leaves, or trash beside.

  • Page 5: Part 2 Specifications

    Specifications 2.Specifications GMU018HXB-2 GMU024HXB-2 Outdoor unit Model （ 1 to 2 ） （ 1 to 2 ） Product Code CB228W0030_ K27204 CB228W0040_ K27204 Power supply 1PH 208-230V~60Hz Refrigerant R410A R410A Cooling capacity (KBTU) 2300 3300 Total power input in cooling mode (W)
  • Page 6 Specifications 780/ － /600 780/ － /600 Fan Motor Speed (rpm) (H/M/L) Output of Fan Motor (W) Fan Motor RLA(A) 0.65 0.65 Fan Motor Capacitor (μF) Air Flow Volume of Outdoor Unit Fan Type Axial fan Axial fan Fan Diameter (mm) Defrosting Method Auto defrost Auto defrost...

  • Page 7: Gmu028Hxb

    Specifications GMU028HXB-3 GMU028HXB-4 Outdoor unit Model （ 2 to 3 ） （ 2to 4 ） Product Code CB228W0050_ K27204 CB228W0060_ K27204 Power supply 1PH 208-230V~60Hz Refrigerant R410A R410A Cooling capacity (KBTU) 4700 4700 Total power input in cooling mode (W) 2600 2600 SEER...
  • Page 8 Specifications Fan Motor Speed (rpm) (H/M/L) 840/740/640 840/740/640 Output of Fan Motor (W) Fan Motor RLA(A) 0.68 0.68 Fan Motor Capacitor (μF) Air Flow Volume of Outdoor Unit Fan Type Axial fan Axial fan Fan Diameter (mm) Defrosting Method Auto defrost Auto defrost Climate Type Isolation...

  • Page 9: Part 3 Construction Views

    Constrction views 3. Construction Views Model GMU018HXB-2 GMU024HXB-2 Unit:mm 1018...

  • Page 10: Gmu028Hxb

    Constrction views GMU028HXB-3 1018 GMU028HXB-4 1018...

  • Page 11: Part 4 Refrigerant System Diagram

    Heat exchanger Electric expansion valve Discharge temp sensor Filter Heat exchanger Electric expansion valve Filter Gas-liquid separator GMU018HXB-2 GMU024HXB-2 Refrigerant pipe diameter Refrigerant pipe diameter Liquid : 1/4" (6 mm) Liquid : 1/4" (6 mm) Gas :3/8" (9.52mm) Gas :1/2" (12mm)

  • Page 12: Part 5 Schematic Diagram

    Main Board Drive Board PFC Module Power Module 5.2 Electrical wiring Model GMU018HXB-2 WARNING WHEN THE UNIT IS RUNNING OR STOPED IN 2 MINUTES OR THE VOLTAGE LESS THAN 30V BETWEEN P AND N OF IPM,PLEASE DON© T TOUCH 14YEGN ANY TERMINAL,AVOIDING ELECTRICAL SHOCK HAZARD.

  • Page 13: Outdoor Unit

    Schematic Diagram Model GMU024HXB-2 WARNING WHEN THE UNIT IS RUNNING OR STOPED IN 2 MINUTES OR THE VOLTAGE LESS THAN 30V BETWEEN P AND N OF IPM,PLEASE DON© T TOUCH 14YEGN ANY TERMINAL,AVOIDING ELECTRICAL SHOCK HAZARD. 15BN AC-L1 AC-L1 AC-N1 AC-N3 AC-L3 16BU...

  • Page 14: Schematic Diagram

    Schematic Diagram Model GMU028HXB-4 POWER 14BN 28BN 15BU 19YEGN 18YEGN 20BN AC-L1 AC-N1 AC-N3 AC-L3 16BN 9YEGN AC-L1 P(1) P© (3) X10(AC-L) N(1) FILTER 21BU 17BU AC-N1 X9(AC-N) XH-3 N(2) N© (4) 10BK 26BK 27RD A(BK) PR N N(1) 11GY 35BK 36RD B(GY)

  • Page 15: Printed Circuit Board

    Schematic Diagram 5.3 Printed Circuit Board Mainboa rd Model GMU018HXB-2,GMU024HXB-2 TOP VIEW Electric heater on chassis（reserved） Ground wire Terminal of temp sensor Heating tape of compressor (reserved) Live wire Reserved terminal Low speed of fan Null wire Reserved terminal for adjusting frequency...
  • Page 16 Refrigerant System Diagram BOTTOM VIEW...
  • Page 17 Refrigerant System Diagram Model GMU028HXB-3,GMU028HXB-4 TOP VIEW Live wire behind wave filter, Terminal for electric heater on chassis Temp sensor terminal connecting to PFC board Terminal for pre-heating tape of Ground wire Reserved terminal for adjusting frequency compressor Connecting wire for fan Live wire Error LED Terminal for 4-way valve...
  • Page 18 Schematic Diagram BOTTOM VIEW...
  • Page 19 Schematic Diagram Drive Board TOP VIEW Negative terminal for input DC of PFC board Terminals for three phases of compressor Positive terminal for input DC of PFC board Terminal for 2-core connecting wire of outdoor mainboard Terminal for 5-core connecting wire of outdoor mainboard Terminal for 3-core connecting wire of PFC board...
  • Page 20 Schematic Diagram BOTTOM VIEW...
  • Page 21 Schematic Diagram Board TOP VIEW Zero terminal of DC, connecting to blue wire of inductor and null wire of outdoor mainboard. Live terminal of AC, connecting to brown wire of inductor and live wire of outdoor mainboard. Terminal for control signal input b drive board Positive terminal of DC of drive board Terminal for white wire of inductor Terminal for yellow wire of inductor...

  • Page 22: Model: Gmu018Hxb

    Description of Each Control Operation 6. Description of Each Control Operation 6.1 Models GMU018HXB-2,GMU024HXB-2 1. Temperature Parameter Outdoor ambient temperature (Toutside amb) Outdoor pipe of heat exchanger temperature (Toutside pipe) 2. Basis functions 2.1 Cooling Mode 2.1.1 Heating changes to Cooling (1) Compressor stops;...
  • Page 23 Description of Each Control Operation 2.3.6 Turbo When outdoor unit receives turbo command from indoor unit, outdoor unit will operate at an increased frequency. 2.4 Fan Mode When outdoor unit changes to fan mode from cooling, dry or heating mode, compressor will stop and outdoor fan will stop 1 min later.
  • Page 24 Description of Each Control Operation 2.6.7 High Temperature-proof in Heating Mode If detect that temperature in the pipe of a indoor unit is high, this indoor unit will stop when set temperature is reached. When such temperature is normal, compressor will resume operation.
  • Page 25 Description of Each Control Operation 2.7 Indicator D101 Description D102 Description D103 Description Compressor operates Blink Communication Malfunction of A Communication Malfunction of B unit Blink Blink once unit (correct data has not been (correct data has not been received for 3 once once received for 3 min)

  • Page 26: Models Gmu028Hxb-3,Gmu028Hxb-4

    Description of Each Control Operation 6.2 Models GMU028HXB-3,GMU028HXB-4 1.Temperature Parameter Indoor Ambient Temperature ( Tindoor amb.) Indoor Set Temperature(Tset) 2. Initial Energization of the Unit Once the unit is energized, by-pass valve will be energized and each electric expansion valve will close in turn. Then by-pass valve will be de-energized and all electric expansion valves will be opened to a certain angle, waiting the startup of the unit.
  • Page 27 Description of Each Control Operation 2.3.3 Switching to Cooling（dry）, or Fan Mode Stop of compressor: 4-way valve stops 2 min later and outdoor fan will stop 1 min later; 4-way valve will be energized. All electric expansion valves will be activated and adjusted to 0P. When valves are totally opened to 480P, by-pass valve will be de-energized. 2.3.4 Outdoor Fan Control In Heating operation, outdoor fan operates for 5s and then compressor operates.
  • Page 28 Description of Each Control Operation 2.4.8 Control of Electric Heating Tape of Compressor If detect that the outdoor ambient temperature is low and the compressor doesn’t operate, electric heating tape of compressor will operate; If compressor operates or the outdoor temperature is high although the compressor doesn’t operate, the electric heating tape doesn’t operate.
  • Page 29 Description of Each Control Operation...
  • Page 30 Description of Each Control Operation...

  • Page 31: Part 7 Installation Manual

    Installation Manual 7. Installation Manual 7.1 Installing the Outdoor Unit Location Use bolts to secure the unit to a flat, solid floor.When mounting the unit on a wall or the roof, make sure the support is firmly secured so that it cannot move in the event of intense vibrations or a strong wind. Do not install the outdoor unit in pits or air vents Installing the pipes Use suitable connecting pipes and equipment for the refrigerant R410A.

  • Page 32: Installation Dimension Diagram

    Installation Manual Models GMU018HXB-2,GMU024HXB-2 Models GMU028HXB-3,GMU028HXB-4 Vacuum pump INDOOR Pompa a vuoto UNITA' INTERNA UNIT Vacuum pump Vacuum pump Refrigerant fluid direction of flow Direzione del fluido refrigerante 2-way valve Valvola a 2 vie Valvola a 3 vie 3-way valve...

  • Page 33: Check After Installation

    Installation Manual GMU028HXB-3 GMU028HXB-4 Air outlet side Air outlet side 7.4 Check After Installation Check Items ProblemsOwing to Improper Installation Is the installation reliable? The unit may drop, vibrate or make noises Has the gas leakage been checked? May cause unsatisfactory cooling (heating) effect Is the thermal insulation of the unit sufficient? May cause condensation and water dropping Is the drainage smooth?

  • Page 34: Part 8 Exploded Views And Parts List

    Exploded Views and Parts list 8. Exploded Views and Parts List 8.1 GMU018HXB-2...
  • Page 35 Exploded Views and Parts list Part Code Description GMU018HXB-2 CB228W0030_ K27204 Front Grill 01473008 Handle 26235401 Front Plate 0130316201P Axial Flow Fan 10335253 Motor FW60C 15013706 Motor Support 01705003 Drainage Choke 06813401 Drainage Pluge 06123401 Metal Base 01203594P Condenser Assy...

  • Page 36: Gmu024Hxb-2

    Exploded Views and Parts list 8.2 GMU024HXB-2 16 17 18...

  • Page 37: Front Grill

    Exploded Views and Parts list Part Code Description GMU024HXB-2 CB228W0040_ K27204 Front Grill 01473001 Housing 01433011 Sm all Handle 26235401 Clapboard Assy 0123303901 Axial Flow Fan 10335253 Fan Motor FW60C 15013706 Motor Support Sub-Assy 01703087 Condenser Assy 01103927 Tem p Sensor Support 24213005 Top Cover 01255262...
  • Page 38 Exploded Views and Parts list Liquid-gas Separator 07225014 Valve 1/4" 07130208 Cable-Cross Loop 76513011 Valve 1/2" 07130210 Valve Support 01713027 Compressor 00105204 C-7RZ233H1A Handle 26235253 Front Side Plate 01305247 Electric Heater Band 76518732 Drainage Choke 06813401 Drainage Pluge 06123401 Power Cord The above data are subject to change without notice.

  • Page 39: Gmu028Hxb-3 Gmu028Hxb-4

    Exploded Views and Parts list 8.3 GMU028HXB-3 GMU028HXB-4 11 12 13...

  • Page 40: Front Plate

    Exploded Views and Parts list Part Code Description GMU028HXB-3 CB228W0050_ K27204 Front Grill 01473001 Front plate 01433011 Axial Flow Fan 10335253 Motor FW60K 15013712 Power Module DY82A 32210057 Radiator 49013013 PFC Module JGP011A 30111019 Module Bracket 24213007 Power Module DY82PFC 2617300601 Reactor LO.275uH+275uH/40A 3120022...
  • Page 41 Exploded Views and Parts list Part Code Description GMU028HXB-4 CB228W0060_ K27204 Front Grill 01473001 Front plate 01433011 Axial Flow Fan 10335253 Motor FW60K 15013712 Power Module DY82A 32210057 Radiator 49013013 PFC Module JGP011A 30111019 Module Bracket 24213007 Power Module DY82PFC 32210058 Reactor LO.275uH+275uH/40A 43120022...

  • Page 42: Part 9 Troubleshooting

    Troubleshooting 9. Troubleshooting Comman Parts 1. Preparation before maintenance Step 1: Confirm the model of inverter unit that needs for repairing at first, search the model and material encode of the main parts that will be damaged easily, especially the controller of outdoor unit. Step 2: According to the malfunction phenomenon, judge the part that may need to be replaced at first and bring those part with you for repairing the unit convenient.

  • Page 43: Troubleshooting

    Troubleshooting Analysis or dishandling for some display malfunction: High pressure protection of system E1 or operation indicator OFF 3s and blinks once High pressure protection of system Check whether the pressure switch is damaged, Replace high pressure switch after stop of unit(pressure< 3.6MPa, the normal status is ON status Check whether the outdoor unit is installed unproperly;...
  • Page 44 Troubleshooting Communication malfunction E6 or operation indicator OFF 3s and blinks 6 times Possible causes: communication lines havn't been connected tightly or wrongly connected; malfunction of communiation circuit module on main board for indoor unit; malfunction of communication circuit module for outdoor unit; abnormal power supply for outdoor unit or the fuse is burnt out Processing method: Make sure that the wire The communication line hasn't...
  • Page 45 Troubleshooting Overload protection of compressor H3 or heating indicator OFF 3s and blinks 3 times Possible causes: Refrigerant is insufficient or superaboundant; compressor can't operate smoothly and dicharge valve is damaged; malfunction of protector. Processing method: Adjust the refrigerant volume; replace compressor; check whether the contact point of protector is conducted when the compressor is not overheating, if not, replace the protector.
  • Page 46 Troubleshooting PFC protection or heating indicator OFF 3s and blinks 6 times Possible causes: Voltage will change suddenly, radiating of PFC module is not good; connecting wires between power module and PFC module have't been connected tightly; overcurrent, etc. Processing method: Cut off the main power supply and then test the DC voltage between P and N of power module.
  • Page 47 Troubleshooting Malfunction of temperature sensor F1, F2, F3, F4, F5 or cooling indicator OFF 3s and blinks once, OFF 3s and blinks twist, OFF 3s and blinks 3 times, OFF 3s and blinks 4 times, OFF 3s and blinks 5 times Processing method: please check whether the resistance value of temperature sensor is normal, whether the temperature sensor is inserted tightly, whether the leading wire of damaged, otherwise, it’s the malfunction of circuit for temperature sensor or controller.

  • Page 48: Troubleshooting

    Troubleshooting Common malfunction analysis method: Model GMU018HXB-2,GMU024HXB-2 Operation indicator of indoor unit (red indicator) blinks 6 times or the nixie tube displays E6. Analysis for communication malfunction Indoor fan's running LED blinks for 6 times or the nixietube display E6,...
  • Page 49 Troubleshooting The red LED101 on drive board AP3 of outdoor unit blinks 5 times, PFC protection analysis The red LED 101 on the outdoor unit’s drive board AP3 blinks for 5 times, and alarm PFC protection According to wiring diagram, check whether the wire connection in outdoor unit’s electric box is loosened, especially the connection line on AP3 , AP2...
  • Page 50 Troubleshooting 3.D101 on system board AP1 blinks 5 times or LED1 on drive board AP3 blinks 3 times, drive board AP2 module protection analysis Unit will be stopped for protection of drive board AP3 if D101 on system board AP1 blinks 5 times or LED1 on drive board AP3 blinks 3 times.
  • Page 51 Troubleshooting 5. Tripping after energization Trip off after energization Check if the connection lines in electric box of ODU are proper according to wiring diagram Correct connection Is malfunction Is there a problem? method according eliminated? to wiring diagram Pull out the connection lines BU and BN at X1 and X6 of system board and then test it...
  • Page 52 Troubleshooting Model GMU028HXB-3,GMU028HXB-4 Operation indicator of indoor unit (red indicator) blinks 6 times or the nixie tube displays E6. Analysis for communication malfunction Indoor running LED blinks for 6 times or the nixietube display E6, malfunction of communication Check whether the Connect it well border line for outdoor or according to the...
  • Page 53 Troubleshooting The red LED101 on drive board AP3 of outdoor unit blinks 5 times, PFC protection analysis The red LED 101 on the outdoor unit’s drive board AP3 blinks for 5 times, and alarm PFC protection According to wiring diagram, check whether the wire connection in outdoor unit’s electric box is loosened, especially the connection line on AP3 , AP2...
  • Page 54 Troubleshooting D101 on system board AP1 blinks 5 times or LED1 on drive board AP3 blinks 3 times, drive board AP2 module protection analysis Unit will be stopped for protection of drive board AP3 if D101 on system board AP1 blinks 5 times or LED1 on drive board AP3 blinks 3 times.
  • Page 55 Troubleshooting Tripping after energization Trip off after energization Check if the connection lines in electric box of ODU are proper according to wiring diagram Correct connection Is malfunction Is there a problem? method according eliminated? to wiring diagram Pull out the connection lines BU and BN at X1 and X6 of system board and then test it...

  • Page 56: Part10 Removal Procedure

    Removal Procedure 10. Removal Procedure 10.1 Model:GMU018HXB-2 Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Top Cover 1. Disassemble Top Cover and Handle Unscrew the screws fixing the top cover, and then lift the top cover to remove it.
  • Page 57 Removal Procedure 4. Disassemble the front panel Screw off the tapping screws of front panel, motor suppoter, chassis condenser side plate, then can take down the front panel. Screws 5. Disassemble the right side plate Screw off the tapping screws of the right side plate, then take down the right side plate.
  • Page 58 Removal Procedure 7. Disassemble Axial Flow Fan Unscrew the nut fixing the fan with a spanner to take out the fan. Axial flow fan 8. Disassemble the motor Unscrew the screws fixing the motor support ,and then lift it upwards to remove it. Unscrew the screws fixing the motor to remove it.
  • Page 59 Removal Procedure 10. Disassemble valve support assembly Unsolder connecting pipe sub-assy and cut-off weld sub-assy from pipeline. Unscrew nut which fixes valve support and then remove valve support sub-assy. Hexangular Nut 11. Disassemble Electronic Expansion Valve Unsolder welding points between electric expansion Electronic Expan- valve and then remove the valve sion Valve...

  • Page 60: Model:gmu024Hxb-2

    Removal Procedure 10.2 Model:GMU024HXB-2 1.Remove Top Cover, Front Side Plate Top Cover Unscrew the screws fixing the top cover, and then lift the top cover to remove it. Unscrew the screws fixing the front side plate to remove it. Front Side Plate 2.Remove Rear Grill Rear Grill Unscrew the 4 screws fixing the rear grill to re-...
  • Page 61 Removal Procedure 4.Remove Cabinet Unscrew the screws fixing the cabinet to remove Screws Cabinet 5. Remove the electric box Unscrew the 4 screws fixing the electric box cover to remove the electric box cover. And then unscrew the 4 screws fixing the electric box, Unplug each leading-wire of electric box.
  • Page 62 Removal Procedure 6. Remove the axial flow fan Unscrew the nut fixing the fan with a spanner to take out the fan. Axial Flow Fan 7. Remove Motor Unscrew the screws fixing the motor support ,and then lift it upwards to remove it. Unscrew the screws fixing the motor to remove it.
  • Page 63 Removal Procedure Remove Electric Expansion Valve Assy (Electric expansion valve assy includes liquid valve, filter, current divider). Remove screw fixing liquid valve, unsolder welding point between current divider and biflow filter, and then remove electric expansion valve. Electric expansion valve Filter Liquid valve Weld...

  • Page 64: Model:gmu028Hxb-3 Gmu028Hxb-4

    Removal Procedure 10.3 ModelS GMU028HXB-3 GMU028HXB-4 1.Remove Top Cover, Front Side Plate Top Cover Unscrew the screws fixing the top cover, and then lift the top cover to remove it. Unscrew the screws fixing the front side plate to remove it. Front Side Plate 2.Remove Rear Grill Rear Grill...
  • Page 65 Removal Procedure 4. Remove Right Side Plate Unscrew the screws at the right side plate, the valve support and the side plate of the condenser to re- move the right Side Plate. Right Side Plate 5. Remove the electric box Unscrew the 4 screws fixing the electric box cover to remove the electric box cover.
  • Page 66 Removal Procedure 6. Remove the axial flow fan Unscrew the nut fixing the fan with a spanner to take out the fan. Axial Flow Fan 7. Remove Motor Unscrew the screws fixing the motor support ,and then lift it upwards to remove it. Unscrew the screws fixing the motor to remove it.
  • Page 67 Removal Procedure Remove Valve Support Assy and Two-way Liquid Receiver (Valve support assy includes gas valve, liquid valve, valve support, effuser, electromagnetic expansion valve and current divider) remove screws fixing valve support, unsolder welding point on two-way liquid receiver and then remove valve support assy (effuser connecting to 4-way valve) Effuser Valve support...

This manual is also suitable for:

Gmu024hxb-2Gmu028hxb-3Gmu028hxb-4

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