Related Manuals for Mars Comfort-Aire Century VMH-SV Series
Summary of Contents for Mars Comfort-Aire Century VMH-SV Series
- Page 1 Service Manual - B-VMHxxAV-1 Service Manual VMH-SV Series Air-Handler Air Conditioners Model B-VMH18, 24 AV-1 Series www.marsdelivers.com...
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Page 2: Table Of Contents
Service Manual - B-VMHxxAV-1 Table of Contents §. Safety Precautions Precautions Information servicing §. Model Reference & External Appearance Model Reference External Appearance §. Indoor Unit Indoor Unit - Air Handler Type §. Outdoor Unit Dimensional Drawings Service Space Capacity Correction Factor for Height Difference Noise Criterion Curves Refrigerant Cycle Diagrams Electrical Wiring Diagrams... - Page 3 Service Manual - B-VMHxxAV-1 Table of Contents §. Troubleshooting Safety Caution General Troubleshooting Outdoor Unit Point Check Function Information Inquiry Error Diagnosis and Troubleshooting Without Error Code Quick Maintenance by Error Code Troubleshooting by Error Code Check Procedures §. Indoor Unit Disassembly Indoor Unit - Air Handler Type §.
- Page 4 Service Manual - B-VMHxxAV-1 Safety Precautions Contents Precautions ......................2 Information servicing(For flammable materials) ..........3...
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Page 5: Safety Precautions
Service Manual - B-VMHxxAV-1 1. Precautions CAUTION To prevent personal injury, or property or unit damage, • • While unpacking be careful of sharp edges around adhere to all precautionary measures and instructions the unit as well as the edges of the fins on the con- denser and evaporator. -
Page 6: Information Servicing
Service Manual - B-VMHxxAV-1 2. Information servicing(For • Prior to work taking place, the area around the equipment is to be surveyed to make sure that there are no flammable flammable materials) hazards or ignition risks. • NO SMOKING signs shall be displayed. Checks to the area Ventilated area •... - Page 7 Service Manual - B-VMHxxAV-1 • that capacitors are discharged: this shall be done in shall also take into account the effects of aging or a safe manner to avoid possibility of sparking; continual vibration from sources such as compressors or fans. •...
- Page 8 Service Manual - B-VMHxxAV-1 • The refrigerant charge shall be recovered into the • Before attempting the procedure ensure that: correct recovery cylinders. The system shall be flushed • mechanical handling equipment is available, if with OFN to render the unit safe. This process may required, for handling refrigerant cylinders;...
- Page 9 Service Manual - B-VMHxxAV-1 • Empty recovery cylinders are evacuated and, if • The recovered refrigerant shall be returned to the possible, cooled before recovery occurs. refrigerant supplier in the correct recovery cylinder, and the relevant Waste Transfer Note arranged. Do not •...
- Page 10 Service Manual - B-VMHxxAV-1 Model Reference Contents Model Reference ....................2 External Appearance .....................3...
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Page 11: Model Reference
Service Manual - B-VMHxxAV-1 1. Model Reference Refer to the following table to determine the specific indoor and outdoor unit model number of your purchased equipment. Indoor Unit Model Outdoor Unit Model Capacity (Btu/h) Power Supply B-VMH18AV-1 A-VMH18SV-1 1Ph, 208/230V~, A-VMH24SV-1 60Hz B-VMH24AV-1... -
Page 12: External Appearance
Service Manual - B-VMHxxAV-1 2. External Appearance Indoor Unit Air handler Outdoor Unit Single Fan Outdoor Unit Model Reference ... - Page 13 Service Manual - B-VMHxxAV-1 Indoor Unit-Air Handler Contents Feature........................2 Dimensional Drawings ..................3 Part names ......................4 Service Place ......................4 Accessories ......................5 Fan Performance ....................6 Capacity Tables ......................9 9 Noise Criterion Curves ..................1 1 5 5 Electrical Characteristics ..................1 1 6 6 Electrical Wiring Diagrams ..................1 1 7 7...
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Page 14: Feature
Service Manual - B-VMHxxAV-1 1. Feature Full Multi-position installation • This AHU is capable of upflow, downflow, horizontal left, or horizontal right configurations. Installation Convenience • It simplifies the airflow volume adjustment process and saves lots of installation efforts. The traditional adjustment method needs the installers to manually set the motor speed, according to the installation instruction and ducting design. -
Page 15: Dimensional Drawings
Service Manual - B-VMHxxAV-1 2. Dimensional Drawings Dimensions(mm) Drain hole Model Unit 1143 Main Overflow 18k~24k drain drain inch 17-1/2 15-3/4 10-1/4 IDU-Air Handler 3 ... -
Page 16: Part Names
Service Manual - B-VMHxxAV-1 3. Part names coil compartment (Access panel Removed) Up ow drain pan Horizontal drain pan 4. Service Place MINIMUM CLEARANCE OF 25.4mm/1″ALL SIDES FLEXIBLE DUCT COLLAR IDU-Air Handler 4 ... -
Page 17: Accessories
Service Manual - B-VMHxxAV-1 5. Accessories The air conditioning system comes with the following accessories. Use all of the installation parts and accessories to in- stall the air conditioner. Improper installation may result in water leakage, electrical shock and fire, or equipment failure. Name Shape Quantity... -
Page 18: Fan Performance
Service Manual - B-VMHxxAV-1 6. Fan Performance 0.04 0.148 External static pressure (in.w.c.) 0.04 0.1 0.148 0.2 External static pressure (in.w.c. IDU-Air Handler 6 ... -
Page 19: Capacity Tables
Service Manual - B-VMHxxAV-1 7. Capacity Tables Cooling B B - - V V M M H H 1 1 8 8 A A V V - - 1 1 ID WB 60.8 64.4 66.2 71.6 INDOOR OUTDOOR AIR FLOW ID DB (CFM) 73.4... - Page 20 Service Manual - B-VMHxxAV-1 5.62 5.68 5.74 5.80 5.90 5.90 5.90 5.96 6.06 6.06 6.06 6.06 6.43 6.43 6.43 6.43 0.75 0.86 0.98 1.00 0.59 0.69 0.79 0.89 0.51 0.61 0.70 0.81 0.33 0.42 0.52 0.61 0.98 0.98 0.98 0.98 0.98 0.98 0.98...
- Page 21 Service Manual - B-VMHxxAV-1 B B - - V V M M H H 2 2 4 4 A A V V - - 1 1 ID WB 60.8 64.4 66.2 71.6 INDOOR OUTDOOR AIR FLOW ID DB (CFM) 73.4 77.0 80.6 84.2...
- Page 22 Service Manual - B-VMHxxAV-1 7.34 7.40 7.46 7.52 7.73 7.73 7.73 7.82 7.93 7.93 7.93 7.93 8.40 8.40 8.40 8.40 0.78 0.90 1.00 1.00 0.60 0.71 0.83 0.98 0.52 0.63 0.73 0.84 0.33 0.42 0.53 0.63 1.27 1.27 1.27 1.27 1.27 1.27 1.27...
- Page 23 Service Manual - B-VMHxxAV-1 Heating B-VMH18AV-1 [SI_Unit] HEATING PERFORMANCE AT INDOOR DRY BULB TEMPERATURE TC:TOTAL CAPACITY IN KILOWATTS (KW) PI:TOTAL POWER IN KILOWATTS (KW) INDOOR OUTDOOR AIRFLOW (CFM) Indoor Conditions (DB °F ) Indoor Conditions (DB °F ) DB(°F) 60.8 68.0 71.6 75.2...
- Page 24 Service Manual - B-VMHxxAV-1 B-VMH18AV-1 [SI_Unit] HEATING PERFORMANCE AT INDOOR DRY BULB TEMPERATURE TC:TOTAL CAPACITY IN KILOWATTS (KW) PI:TOTAL POWER IN KILOWATTS (KW) INDOOR OUTDOOR AIRFLOW (CFM) Indoor Conditions (DB °F ) Indoor Conditions (DB °F ) DB(°F) 60.8 68.0 71.6 75.2 60.8...
- Page 25 Service Manual - B-VMHxxAV-1 B-VMH24AV-1 [SI_Unit] HEATING PERFORMANCE AT INDOOR DRY BULB TEMPERATURE TC:TOTAL CAPACITY IN KILOWATTS (KW) PI:TOTAL POWER IN KILOWATTS (KW) INDOOR OUTDOOR AIRFLOW (CFM) Indoor Conditions (DB °F ) Indoor Conditions (DB °F ) DB(°F) 60.8 68.0 71.6 75.2 60.8...
- Page 26 Service Manual - B-VMHxxAV-1 B-VMH24AV-1 [SI_Unit] HEATING PERFORMANCE AT INDOOR DRY BULB TEMPERATURE TC:TOTAL CAPACITY IN KILOWATTS (KW) PI:TOTAL POWER IN KILOWATTS (KW) INDOOR OUTDOOR AIRFLOW (CFM) Indoor Conditions (DB °F ) Indoor Conditions (DB °F ) DB(°F) 60.8 68.0 71.6 75.2 60.8...
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Page 27: Noise Criterion Curves
Service Manual - B-VMHxxAV-1 8. Noise Criterion Curves Notes: -Sound measured at 1.5m away from the center of the unit. -Data is valid at free field condition -Data is valid at nominal operation condition -Reference acoustic pressure OdB = 20µPa -Sound level will vary depending on a range of factors such as the construction -(acoustic absorption coefficient) of particular room in which the equipment is installed. -
Page 28: Electrical Characteristics
Service Manual - B-VMHxxAV-1 9. Electrical Characteristics Capacity (Btu/h) 18k hyper Heat 24k hyper Heat Phase Power (Outdoor) Frequency And Volt 208/230V,60Hz Indoor unit(A) Max Fuse Outdoor unit(A) Line quantity Outdoor Unit Line 12/4.0mm² 12/4.0mm² Power Wire diameter(AWG) Line quantity Outdoor-indoor Line 16/1.5mm... -
Page 29: Electrical Wiring Diagrams
Service Manual - B-VMHxxAV-1 10. Electrical Wiring Diagrams IDU Capacity (Btu/h) IDU Wiring Diagram 18k~24k 16023000012126 Abbreviation Paraphrase Yellow-Green Conductor Indoor Fan Capacitor Indoor Fan Motor Indoor ECM Motor TO CCM Comm.Bus Central Controller Indoor Room Temperature Sensor Indoor Coil Inlet Temperature Sensor Indoor Coil Outlet Temperature Sensor Indoor Coil Temperature Sensor IDU-Air Handler 1 1 7 7... - Page 30 Service Manual - B-VMHxxAV-1...
- Page 31 Service Manual - B-VMHxxAV-1 10.1 Micro-Switch Introduce: A For ALARM terminal port CN33 1. Provide the terminal port to connect ALARM, but no voltage of the terminal port , the power from the ALARM system (not from the unit ) 2.
- Page 32 Service Manual - B-VMHxxAV-1 B. For remote control (ON-OFF) terminal port CN2 and short connector of JR1 1. Remove the short connector of JR1 when you use ON-OFF function; 2. When remote switch off (OPEN); the unit would be off; 3.
- Page 33 Service Manual - B-VMHxxAV-1 10.2 Micro-Switch Introduce: FOR SETTING NETADDRESS S1+S2 CODE 0~15 16~31 32~47 48~63 NETADDRESS F A C T O R Y S E T T I N G A. Micro-switch S1 and dial-switch S2 are for address setting when you want to control this unit by a central controller. Range: 00-63 ENC1 CODE...
- Page 34 Service Manual - B-VMHxxAV-1 The first group controls the electric SW2-1 heating to turn on the temperature 1°C(1.8°F) 2°C(3.6°F) difference Whether the electric heating is SW2-2 delayed Electric auxiliary heating delay start SW2-3 30min 15min time Compressor allowed to Electric heating allowed to Electric heating/compressor allow SW2-4 operate to low limit set by...
- Page 35 Service Manual - B-VMHxxAV-1 Outdoor Unit Contents Dimensional Drawings ..................2 Service Place ......................5 5 Capacity Correction Factor for Height Difference ..........6 6 Noise Criterion Curves ..................7 7 Refrigerant Cycle Diagrams ................9 9 Electrical Wiring Diagrams ..................1 1 0 0...
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Page 36: Dimensional Drawings
Service Manual - B-VMHxxAV-1 1. Dimensional Drawings Please check the corresponding dimensional drawing according to the panel plate. ODU Model Panel Plate A-VMH18SV-1 X430 A-VMH24SV-1 Outdoor Unit 2 ... - Page 37 Service Manual - B-VMHxxAV-1 X430(Square grille) Panel Plate Outdoor Unit 3 3 ...
- Page 38 Service Manual - B-VMHxxAV-1 Panel Plate D30(Square grille) Outdoor Unit 4 4 ...
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Page 39: Service Place
Service Manual - B-VMHxxAV-1 2. Service Place Minimim 4” Recommended 12” Outdoor Unit 5 5 ... -
Page 40: Capacity Correction Factor For Height Difference
Service Manual - B-VMHxxAV-1 3. Capacity Correction Factor for Height Difference Capacity(Btu/h) Pipe Length (m) Cooling 0.941 0.919 Indoor Upper 0.974 0.951 0.928 than Outdoor 0.995 0.983 0.960 0.937 Height difference 1.000 0.988 0.965 0.942 H (m) 1.000 0.988 0.965 0.942 Outdoor Upper 0.988... -
Page 41: Noise Criterion Curves
Service Manual - B-VMHxxAV-1 4. Noise Criterion Curves Note: H= 0.5 × height of outdoor unit Notes: -Sound measured at 1.0m away from the center of the unit. -Data is valid at free field condition -Data is valid at nominal operation condition -Reference acoustic pressure OdB=20µPa -Sound level will vary depending on arrange off actors such as the construction (acoustic absorption coefficient) of particular room in which the equipment is installed. - Page 42 Service Manual - B-VMHxxAV-1 A-VMH18SV-1 A-VMH24SV-1 Outdoor Unit 8 8 ...
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Page 43: Refrigerant Cycle Diagrams
Service Manual - B-VMHxxAV-1 5. Refrigerant Cycle Diagrams Pipe Size (Diameter:ø) Piping length (m/ft) Elevation (m/ft) mm(inch) Model Additional Refrigerant Liquid Rated Max. Rated Max. A-VMH18SV-1 12.7(1/2) 6.35(1/4) 7.5/24.6 30/98.4 20/65.6 15g/m (0.16oz/ft) A-VMH24SV-1 15.9(3/4) 9.52(3/8) 7.5/24.6 30/98.4 20/65.6 30g/m (0.32oz/ft) Outdoor Unit 9 9 ... -
Page 44: Electrical Wiring Diagrams
Service Manual - B-VMHxxAV-1 Electrical Wiring Diagrams ODU Model ODU Wiring Diagram A-VMH18SV-1 16022000035849 A-VMH24SV-1 16022000036331 ODU Model ODU Main Printed Circuit Board ODU IPM Printed Circuit Board A-VMH18SV-1 17122000048064 A-VMH24SV-1 17122000047742 Outdoor Unit 1 1 0 0 ... - Page 45 Service Manual - B-VMHxxAV-1...
- Page 46 Service Manual - B-VMHxxAV-1 BLACK BLUE COMP_ T OP OPTIOna l CN3 2 CN2 9 CN3 0 CN2 6 CN4 2 CN1 6 BLACK BLUE BLUE CN2 0 OPTIONAL HE AT1 CN 8 BLACK CN2 1 WHITE OPTIONAL HE AT2 CN3 6 BLACK CN2 7...
- Page 47 Service Manual - B-VMHxxAV-1 Outdoor unit printed circuit board diagram: 17122000047742...
- Page 48 Service Manual - B-VMHxxAV-1 Name Meaning CN11 N_in: connect to N-line (208-230V AC input) Power Supply CN12 L_in: connect to L-line (208-230V AC input) EEV-A CN16 EEV-B CN13 EEV-C EEV-D CN15 connect to electric expansion valve EEV-E EEV-F CN17 EEV-G CN14 connect to pipe temp.
- Page 49 Service Manual - B-VMHxxAV-1 Name Meaning HEAT_D CN20 connect to the heater, 208-230V AC when is ON CN21 HEAT_Y CN36 4-WAY CN38 connect to 4 way valve, 208-230V AC when is ON. CN27 connect to key board CN1 Note: This section is for reference only. Please take practicality as standard.
- Page 50 Service Manual - B-VMHxxAV-1 Outdoor unit printed circuit board diagram: 17122000048064 RC 2 VU B...
- Page 51 Service Manual - B-VMHxxAV-1 Name Meaning Earth: connect to Ground Power Supply N_in: connect to N-line (208-230V AC input) L_in: connect to L-line (208-230V AC input) S: connect to indoor unit communication 4-WAY CN60 connect to 4 way valve, 208-230V AC when is ON. AC-FAN connect to AC fan HEAT2...
- Page 52 Service Manual - B-VMHxxAV-1 Installation Contents Installation Overview Location Selection Indoor Unit Installation Outdoor Unit Installation Drainage Pipe Installation Refrigerant Pipe Installation Vacuum Drying and Leakage Checking Additional Refrigerant Charge Engineering of Insulation Engineering of Electrical Wiring Test Operation...
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Page 53: Installation Overview
Service Manual - B-VMHxxAV-1 1. Installation Overview Indoor Unit Indoor Unit Install the indoor unit Install the outdoor unit Install the drainpipe Connect the wires Connect the refrigerant pipes Evacuate the refrigeration system Install the panel Perform a test run (only for cassette type) ... -
Page 54: Location Selection
Service Manual - B-VMHxxAV-1 2. Location selection 2.1 Unit location selection can refer to installation manual. 2.2 DO NOT install the unit in the following locations: • Where oil drilling or fracking is taking place. • Coastal areas with high salt content in the air. •... -
Page 55: Indoor Unit Installation
Service Manual - B-VMHxxAV-1 3. Indoor Unit Installation(AHU) Horizontal installation 3.1 Service space for indoor unit Horizontal installation Plenum Clearances: 24inch(min) MINIMUM CLEARANCE OF 25.4mm/1″ALL SIDES 3.2 Install the main body FLEXIBLE The unit may be installed in one of the upflow, downflow, DUCT COLLAR horizontal left or horizontal right orientations. - Page 56 Service Manual - B-VMHxxAV-1 For the Horizontal left installation and vertical down installation, the direction of the evaporator should be changed and the drain pan should be removed first. Please do it according to the following steps: 1. Remove the fixed plate of the filter ,then take the filter off.
- Page 57 Service Manual - B-VMHxxAV-1 4. Unplug temperature sensors T1,T2 from the control board. 6. Take out the evaporator and drain pan and rotate 180 T1: Room temperature sensor(only available for some models) T2: Evaporator central temperature sensor 7.Adjust the position of the mounting parts. NOTE: T1 is only available for some models.
- Page 58 Service Manual - B-VMHxxAV-1 Hook the wire into the buckle and go down from the wire slot. Replace foam gaster over wires. 9. Reinstall T1,T2 sensor plug and tie up the sensor wires. Note: The wire body needs to pass through the wire 10.
- Page 59 Service Manual - B-VMHxxAV-1 12. Connect the wire according to the wiring diagram. 13. Reassemble the upper cover. 14. Reinstal the flter and flter cover plate. 15. Connect the pipes. 16. Install the drainage pipes. 3. IDU Installation-AHU ...
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Page 60: Outdoor Unit Installation
Service Manual - B-VMHxxAV-1 4. Outdoor unit installation 4.3 Install Outdoor Unit Fix the outdoor unit with anchor bolts(M10) 4.1 Service space for outdoor unit Minimum 4”- Reccomended 12” >60cm / 23.6” Fix with bolts Caution Since the gravity center of the unit is not at its physical center, so please be careful when lifting it with a sling. - Page 61 Service Manual - B-VMHxxAV-1 For Vertical drainage pipe (The following table is for 5. Drainage Pipe Installation reference) Install the drainage pipe as shown below and take Reference measures against condensation. Improperly installation Allowable value of inner could lead to leakage and eventually wet furniture and maximum water Remark pipe...
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Page 62: Drainage Pipe Installation
Service Manual - B-VMHxxAV-1 5.3 Insulation work of drainage pipe Refer the introduction to the insulation engineering parts. • The correct installation will not cause converse water flow and the slope of the branch pipes can be adjusted freely • The false installation will cause converse water flow and the slope of the branch pipe can not be ad- justed. -
Page 63: Refrigerant Pipe Installation
Service Manual - B-VMHxxAV-1 6. Refrigerant Pipe Installation 2.Confirm the cross way of the pipes. 3.Measure the necessary pipe length. 6.1 Maximum length and drop height 4.Cut the selected pipe with pipe cutter Ensure that the length of the refrigerant pipe, the number •... -
Page 64: Vacuum Drying And Leakage Checking
Service Manual - B-VMHxxAV-1 7. Vacuum Drying and Leakage 10. Set the wall conduit Checking 11. Set the supporter for the pipe. 12. Locate the pipe and fix it by supporter 7.1 Purpose of vacuum drying • For horizontal refrigerant pipe, the distance be- •... -
Page 65: Additional Refrigerant Charge
Service Manual - B-VMHxxAV-1 4. Rain water might penetrate into pipeline during 8. Additional Refrigerant Charge construction. • After the vacuum drying process is carried out, the additional refrigerant charge process need to be performed. Procedures of special vacuum drying are as follows: •... -
Page 66: Engineering Of Insulation
Service Manual - B-VMHxxAV-1 9 . Engineering of Insulation insulation and cause easy aging of the material. 9.2 Insulation of drainage pipe 9.1 Insulation of refrigerant pipe 1. Operational procedure of refrigerant pipe 1. Operational procedure of refrigerant pipe insulation insulation Select the suitable pipe →... -
Page 67: Engineering Of Electrical Wiring
Service Manual - B-VMHxxAV-1 2. Specific wiring method Engineering of Electrical Wring Connection method A: 1. Highlights of electrical wiring installation Refer to the wiring method of internal and external • All field wiring construction should be finished by machine communication and wired controller as follows: qualified electrician. - Page 68 Service Manual - B-VMHxxAV-1 NOTE: The wiring method of the thermostat and 3.4 Dehumidification control wiring the internal machine refers to the wiring of the non- communication scheme. 3. Optional function wiring HUMIDISTAT 3.1 Condensate overflow switch The unit will accommodate a remote condensate overflow switch.
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Page 69: Test Operation
Service Manual - B-VMHxxAV-1 11. Test Operation b. Remove the test cover. Add 2000ml of water to the tank through the attached tube. 1. The test operation must be carried c. Turn on the main power switch and run the air out after the entire installation has been conditioner in COOL mode. - Page 70 Service Manual - B-VMHxxAV-1 Maintenance Contents First Time Installation Check .................2 Refrigerant Recharge ....................4 Re-Installation .......................5 Indoor Unit ....................5 Outdoor Unit ....................7...
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Page 71: First Time Installation Check
Service Manual - B-VMHxxAV-1 1. First Time Installation Check Air and moisture trapped in the refrigerant system affects To prevent air and moisture from affecting the air the performance of the air conditioner by: conditioner’s performance, the indoor unit, as well as the pipes between the indoor and outdoor unit, must be be •... - Page 72 Service Manual - B-VMHxxAV-1 Procedure: • If the pressure successfully reaches -0.1 MPa Tighten the flare nuts of the indoor and outdoor units, and confirm that both the 2- and 3-way valves (14.5 Psi), fully close the Handle Lo valve, then cease vacuum pump operations.
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Page 73: Refrigerant Recharge
Service Manual - B-VMHxxAV-1 2. Refrigerant Recharge mA A Procedure: Close both 2- and 3-way valves. 3-way valves. Slightly connect the Handle Lo charge hose to the Operate the air conditioner in cooling mode to charge 3-way service port. the system with liquid refrigerant. Connect the charge hose to the valve at the bottom When the electronic scale displays the correct of the cylinder. -
Page 74: Re-Installation
Service Manual - B-VMHxxAV-1 3. Re-Installation Indoor Unit Collecting the refrigerant into the outdoor unit Procedure: Confirm that the 2- and 3-way valves are opened. Close the 3-way valve so that the gauge rests between 0.3 MPa (43.5 Psi) and 0.5 MPa (72.5 Psi). Connect the charge hose with the push pin of Handle Lo to the 3-way valve’s gas service port. - Page 75 Service Manual - B-VMHxxAV-1 Air purging with vacuum pump Procedure: • If the pressure successfully reaches -0.1 MPa Tighten the flare nuts of the indoor and outdoor (14.5 Psi), fully close the Handle Lo valve, then units, and confirm that both the 2- and 3-way valves cease vacuum pump operations.
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Page 76: Outdoor Unit
Service Manual - B-VMHxxAV-1 Outdoor Unit Evacuation for the whole system Procedure: Wait for 5 minutes then check whether the gauge Confirm that the 2- and 3-way valves are opened. needle moves after turning off the vacuum pump. If Connect the vacuum pump to the 3-way valve’s the gauge needle moves backward, check whether service port. - Page 77 Service Manual - B-VMHxxAV-1 Refrigerant charging mA A Procedure: Close both 2- and 3-way valves. Fully open the Handle Lo manifold valve, 2- and 3-way valves. Slightly connect the Handle Lo charge hose to the 3-way service port. Operate the air conditioner in cooling mode to charge the system with liquid refrigerant.
- Page 78 Service Manual - B-VMHxxAV-1 Product Features Contents Display Function ....................2 Safety Features ......................3 Basic Functions .......................3 Abbreviation ....................3 Fan Mode ......................3 Cooling Mode ....................3 Heating Mode(Heat Pump Units) ..............4 Auto Mode ....................5 Drying Mode ....................5 Forced Operation Function ................5 Timer Function ....................6 Sleep Function ....................6 3.10 Auto-Restart Function ..................6 Remote Controller Functions ................7...
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Page 79: Display Function
Service Manual - B-VMHxxAV-1 1. Display Function Mode Priority Y/Y2 W W1 W2 E/AUX DH/DS/BK Display Shut down Cooling Cooling 2 Dehumidification 1 Dehumidification 2 Heating 1 Heating 2 Heating 2 Electric heating 1 Electric heating 1 Electric heating 2 Heating 1+Electric heating 1 Heating 1+Electric heating 1 Heating 2 +Electric heating 1... -
Page 80: Safety Features
Service Manual - B-VMHxxAV-1 2. Safety Features Fan Mode Compressor three-minute delay at restart When fan mode is activated: • The outdoor fan and compressor are stopped. Compressor functions are delayed for up to ten seconds upon the first startup of the unit, and are delayed for up •... -
Page 81: Heating Mode(Heat Pump Units)
Service Manual - B-VMHxxAV-1 2) Auto fan action in cooling mode: 2) When the current is higher than the predefined safe value, surge protection is activated, causing the • Descent curve compressor to cease operations. • When T1-Tsc is lower than or equal to 3.5°C, fan speed reduces to high;... -
Page 82: Auto Mode
Service Manual - B-VMHxxAV-1 different. and the temperature setting can be adjusted between 16°C~30°C. 3.4.4 Defrosting mode • In auto mode, the machine selects cooling, heating, or • The unit enters defrosting mode according to the fan-only mode on the basis of ∆T (∆T =T1-TS). temperature value of T3 and T4 as well as the compressor running time. -
Page 83: Timer Function
Service Manual - B-VMHxxAV-1 Timer Function • The timing range is 24 hours. • Timer On. The machine turns on automatically at the preset time. • Timer Off. The machine turns off automatically at the preset time. • Timer On/Off. The machine turns on automatically at the preset On Time, and then turns off automatically at the preset Off Time. -
Page 84: Remote Controller Functions
Service Manual - B-VMHxxAV-1 4. Remote Controller Functions LCD Wired Remote Controller- KJR-120X/TFBG-E(Standard) i) Buttons and Functions 1. POWER button 6. TIMER button Turn on of turn off the unit. To set timer on and timer off time of one day MODE button 7. - Page 85 Service Manual - B-VMHxxAV-1 ii) LCD Screen 1 Operation mode indication 8 Sleep mode indication 2 Fan speed indication 9 Electric Auxiliary Heat/Turbo function indication(some models) 3 Temperature display NOTE: AHU models only have turbo functions. 4 Lock indication 10 Left-right swing indication (some models) 5 °C / °F indication 11 Clock display 6 Room temperature indication...
- Page 86 Service Manual - B-VMHxxAV-1 iii) Installation • Dimensions 20mm 120mm 46mm 60mm 1) Connection • Wire with the indoor unit: 60mm Wiring hole HA HB • 1: Indoor Unit. • 2: Notch the part for the wiring to pass through with a nipper tool. •...
- Page 87 Service Manual - B-VMHxxAV-1 For some models: The wired controller connects to terminal board, terminal board connects to main control board. Main control board Terminal board CN40 ENC1 HA HB HA HB Wired controller 2) Address setting Unit1 Unit2 Unit16 HA HB HA HB HA HB...
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Page 88: Centralized Controller
Service Manual - B-VMHxxAV-1 Centralized Controller 1) Connection For Light commercial air conditioner with XYE port, it can be directly connected to Centralized Controller (CCM03, CCM09). 2) Address setting When setting the address, please make sure the unit is powered off. The address can be set from 0 to 63 by the switch. Turn on the unit, then the address will be effective. - Page 89 Service Manual - B-VMHxxAV-1 Troubleshooting Contents Safety Caution .......................3 General Troubleshooting ..................4 Outdoor Unit Point Check Function ..............7 Information Inquiry ....................9 Error Diagnosis and Troubleshooting Without Error Code .......13 Remote maintenance ...................13 Field maintenance ..................14 Quick Maintenance by Error Code ..............19 Troubleshooting by Error Code ................21 EH 00 / EC 51 (EEPROM parameter error Diagnosis and Solution) ....21 EL 01 (Indoor and outdoor unit communication error Diagnosis and Solution) 22...
- Page 90 Service Manual - B-VMHxxAV-1 Troubleshooting Contents 7.11 PC 02 (Top temperature protection of compressor or High temperature protection of IPM module Diagnosis and Solution) ........34 7.12 EC 0d (Outdoor unit malfunction Diagnosis and Solution) ......35 7.13 PC 40(Communication error between outdoor main PCB and IPM board diagnosis and solution) ................36 7.14 PC 08(Current overload protection)/PC 44(Outdoor unit zero speed protection)/ PC 46(Compressor speed has been out of control)/PC 49(Compressor...
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Page 91: Safety Caution
Service Manual - B-VMHxxAV-1 1. Safety Caution WARNING Be sure to turn off all power supplies or disconnect all wires to avoid electric shock. While checking indoor/outdoor PCB, please equip oneself with antistatic gloves or wrist strap to avoid damage to the board. WARNING Electricity remains in capacitors even when the power supply is off. -
Page 92: General Troubleshooting
Service Manual - B-VMHxxAV-1 2. General Troubleshooting Error Display (Indoor Unit) When the indoor unit encounters a recognized error, the operation lamp will flash in a corresponding series, the timer lamp may turn on or begin flashing, and an error code will be displayed. These error codes are described in the following table: Display Error Information... - Page 93 Service Manual - B-VMHxxAV-1 PC 03 Low pressure protection (for some models) TS33 Outdoor unit malfunction TS35 ec 0 Low ambient temperature protection TS42 PC 0L Mismatch between the new and old platforms TS48 FL 09 For other errors: The display board may show a garbled code or a code undefined by the service manual. Ensure that this code is not a temperature reading.
- Page 94 Service Manual - B-VMHxxAV-1 Error Display (For Some Outdoor Unit) Display Malfunction or Protection Solution Outdoor EEPROM malfunction TS21 EC 51 Indoor / outdoor units communication error TS22 EL 01 Communication malfunction between adapter board and outdoor main board TS48 EL 16 IPM module protection TS30...
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Page 95: Outdoor Unit Point Check Function
Service Manual - B-VMHxxAV-1 3. Outdoor Unit Point Check Function • A check switch is included on the outdoor PCB. • Push SW1 to check the unit’s status while running. The digital display shows the following codes each time the SW1 is pushed. - Page 96 Service Manual - B-VMHxxAV-1 Frequency limit caused by The display value is a Bit7 IGBT radiator hexidecimal number. For example, the Bit6 Reserved digital display show Bit5 Reserved 2A, then Bit5=1, Frequency limit caused by low Bit4 Bit3=1, and Bit1=1. temperature of T2.(LH00) Frequency limit caused by Frequency limit symbol...
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Page 97: Information Inquiry
Service Manual - B-VMHxxAV-1 4. Information Inquiry • To enter engineer mode, in power-on or standby mode, and in non-locked state, press the key combination “ON/OFF + Air Speed” for 7s: • After entering the engineer mode, the remote control will display icons of “Auto, Cool, Dry, Heat”, and the Battery icon;... - Page 98 Service Manual - B-VMHxxAV-1 press "On/Off" for 2s to enter Twins Selector, the code displayed is “Ch”, Compressor press "OK" to send the Query Twins Selector code; press the Up/Down key to Running select, 0 indicates that there is no Twins, 1 indicates the host, and 2 indicates Frequency Fr the slave.
- Page 99 Service Manual - B-VMHxxAV-1 press "On/Off" for 2s to enter the Cooling Temperature Compensation Value Settings, the code displayed is “Ch”, then press "OK" to send the Query Cooling Temperature Compensation Value code; press the Up/Down key to select the cooling temperature compensation value, then press "OK"; and press "On/Off"...
- Page 100 Service Manual - B-VMHxxAV-1 Error code of engineer mode Display Error Information EH 00 Indoor unit EEPROM parameter error EL 01 Indoor / outdoor unit communication error Communication malfunction between adapter board and outdoor main board EL 16 The indoor fan speed is operating outside of the normal range EH 03 Outdoor unit EEPROM parameter error EC 51...
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Page 101: Error Diagnosis And Troubleshooting Without Error Code
Service Manual - B-VMHxxAV-1 5. Error Diagnosis and Troubleshooting Without Error Code WARNING Be sure to turn off unit before any maintenance to prevent damage or injury. Remote maintenance SUGGESTION: When troubles occur, please check the following points with customers before field maintenance. Problem Solution Unit will not start... -
Page 102: Field Maintenance
Service Manual - B-VMHxxAV-1 Field maintenance Problem Solution Unit will not start TS17 - TS18 Compressor will not start but fans run TS17 - TS18 Compressor and condenser (outdoor) fan will not start TS17 - TS18 Evaporator (indoor) fan will not start TS17 - TS18 Condenser (Outdoor) fan will not start TS17 - TS18... - Page 103 Service Manual - B-VMHxxAV-1 Troubleshooting 15 ...
- Page 104 Service Manual - B-VMHxxAV-1 1.Remote Maintenance Others Possible causes of trouble Unit will not start The power switch is on but fans will not start ☆ The temperature on the display board cannot be set Unit is on but the wind is not cold(hot) Unit runs, but shortly stops The unit starts up and stops frequently ☆...
- Page 105 Service Manual - B-VMHxxAV-1 2.Field Maintenance Refrigerant Circuit Others Possible causes of trouble Unit will not start Compressor will not start but fans run ☆ Compressor and condenser (outdoor) fan will not start Evaporator (indoor) fan will not start Condenser (Outdoor) fan will not start Unit runs, but shortly stops ☆...
- Page 106 Service Manual - B-VMHxxAV-1 2.Field Maintenance Electrical Circuit Possible causes of trouble Unit will not start ☆ ☆ ☆ ☆ ☆ ☆ Compressor will not start but fans run ☆ ☆ ☆ ☆ ☆ Compressor and condenser (outdoor) fan will not start ☆...
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Page 107: Quick Maintenance By Error Code
Service Manual - B-VMHxxAV-1 6. Quick Maintenance by Error Code If you do not have the time to test which specific parts are faulty, you can directly change the required parts according the error code. You can find the parts to replace by error code in the following table. Error Code Part requiring replacement... - Page 108 Service Manual - B-VMHxxAV-1 Part requiring EL 16 eh 0b pc 06 pc 08/44/ 49 pc 0a pc 0f replacement Indoor PCB Outdoor PCB Outdoor fan motor T3 Sensor TP Sensor Pressure sensor Reactor Compressor IPM module board Data adapter board High pressure valve assy High pressure protector Low pressure protector...
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Page 109: Troubleshooting By Error Code
Service Manual - B-VMHxxAV-1 7. Troubleshooting by Error Code EH 00 / EC 51 (EEPROM Parameter Error Diagnosis and Solution) Description: Indoor or outdoor PCB main chip does not receive feedback from EEPROM chip. Recommended parts to prepare: • Indoor PCB •... -
Page 110: El 01 (Indoor And Outdoor Unit Communication Error Diagnosis And Solution)
Service Manual - B-VMHxxAV-1 EL 01 (Indoor and Outdoor Unit Communication Error Diagnosis and Solution) Description: Indoor unit can not communicate with outdoor unit Recommended parts to prepare: • Signal wires • Magnet ring • Indoor PCB • Outdoor PCB Troubleshooting and repair: XYE Communication: Power off, then restart the unit 2... - Page 111 Service Manual - B-VMHxxAV-1 S Communication: Power off, then restart the unit after 2 minutes. Does the error code Solved disappear? Check the wiring connection Correct the connection or between indoor and outdoor change wires unit, are they good? The value is alternative from negative to positive Check the wiring connection Measure the DC voltage between N/L2...
- Page 112 Service Manual - B-VMHxxAV-1 Remarks: • Use a multimeter to test the DC voltage between 2 port(or S or L2 port) and 3 port(or N or S port) of outdoor unit. The red pin of multimeter connects with 2 port(or S or L2 port) while the black pin is for 3 port(or N or S port) . •...
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Page 113: Eh 03 / Ec 07 (Fan Speed Is Operating Outside Of The Normal Range )/Ec
Service Manual - B-VMHxxAV-1 EH 03 / EC 07 (Fan Speed Is Operating Outside of Normal Range)/EC 71(Over Current Failure of Outdoor DC Fan Motor)/ EC73(Zero-speed failure of outdoor DC fan motor) Diagnosis and Solution Description: When indoor / outdoor fan speed keeps too low or too high for a certain time, the unit ceases operation and the LED displays the failure. - Page 114 Service Manual - B-VMHxxAV-1 Index: 1. Indoor DC Fan Motor(control chip is in fan motor) Power on and when the unit is in standby, measure the voltage of pin1&pin2 of CN15, pin3 of CN34 in fan motor connector. If the value of the voltage is not in the range showing in below table, the PCB must has problems and need to be replaced.
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Page 115: Eh 60/Eh 61/Ec 53/Ec 52/Ec 54/Ec 56/Ec 57/Ec 50/Ec 5C
Service Manual - B-VMHxxAV-1 EH 60/EH 61/EH 62/ EH 65/ EC 53/EC 52/EC 54/EC 56/EC 57/EC 50/EC 5C (Open Circuit or Short Circuit of Temperature Sensor Diagnosis and Solution) Description: If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED displays the failure. Recommended parts to prepare: •... -
Page 116: El 0C (Refrigerant Leakage Detection Diagnosis And Solution)
Service Manual - B-VMHxxAV-1 EL 0C (Refrigerant Leakage Detection Diagnosis and Solution) Description: Judging the abnormality of the refrigeration system according to the number of compressor stops and the changes in operating parameters caused by excessive exhaust temperature. Recommended parts to prepare: •... -
Page 117: Eh 0E(Water-Level Alarm Malfunction Diagnosis And Solution)
Service Manual - B-VMHxxAV-1 EH 0E(Water-Level Alarm Malfunction Diagnosis and Solution) Description: If the sampling voltage is not 5V, the LED displays the failure code. Recommended parts to prepare: • Connection wires • Water-level switch • Water pump • Indoor PCB Shut off the power supply and Shut off the power supply and turn it on 2 minutes later. -
Page 118: Pc 00(Ipm Malfunction Or Igbt Over-Strong Current Protection Diagnosis And Solution)
Service Manual - B-VMHxxAV-1 PC 00(IPM malfunction or IGBT over-strong current protection Diagnosis and Solution) Description: When the voltage signal the IPM sends to the compressor drive chip is abnormal, the display LED shows “PC 00” and the AC turn off. Recommended parts to prepare: •... -
Page 119: Pc 01(Over Voltage Or Too Low Voltage Protection)/Pc
Service Manual - B-VMHxxAV-1 PC 01(Over voltage or too low voltage protection)/PC 10(Outdoor unit low AC voltage protection)/PC 11(Outdoor unit main control board DC bus high voltage protection)/PC 12(Outdoor unit main control board DC bus high voltage protection /341 MCE error) Diagnosis and Solution Description: Abnormal increases or decreases in voltage are detected by checking the specified voltage detection circuit. -
Page 120: Pc 04(Inverter Compressor Drive Error Diagnosis And Solution)
Service Manual - B-VMHxxAV-1 PC 04(Inverter compressor drive error Diagnosis and Solution) Description: An abnormal inverter compressor drive is detected by a special detection circuit, including communication signal detection, voltage detection, compressor rotation speed signal detection and so on. Recommended parts to prepare: •... -
Page 121: Pc 03/Pc 31(Low Pressure Protection Diagnosis And Solution)
Service Manual - B-VMHxxAV-1 7.10 PC 03/PC 31(Low Pressure Protection Diagnosis and Solution) Description: If the sampling voltage is not 5V, the LED displays a failure code. Recommended parts to prepare: • Connection wires • Low pressure protector • Indoor fan assembly •... -
Page 122: Protection Of Ipm Module Diagnosis And Solution)
Service Manual - B-VMHxxAV-1 7.11 PC 02/LC 06(Top temperature protection of compressor or High temperature protection of IPM module diagnosis and solution) Description: For some models with overload protection, If the sampling voltage is not 5V, the LED will display the failure. If the temperature of IPM module is higher than a certain value, the LED displays the failure code. -
Page 123: Ec 0D(Outdoor Unit Malfunction Diagnosis And Solution)
Service Manual - B-VMHxxAV-1 Check the fastening screws on the PCB and IPM radiator. Replace the outdoor Are they fixed tightly? control PCB. Tighten the screws and apply silicon grease. 7.12 EC 0d(Outdoor unit malfunction Diagnosis and Solution) Description: The indoor unit detect the outdoor unit is error. Recommended parts to prepare: •... -
Page 124: Pc 40(Communication Error Between Outdoor Main Pcb And Ipm Board Diagnosis And Solution)
Service Manual - B-VMHxxAV-1 7.13 PC 40(Communication error between outdoor main PCB and IPM board diagnosis and solution) Description: The main PCB cannot detect the IPM board. Recommended parts to prepare: • Connection wires • IPM board • Outdoor main PCB •... -
Page 125: Pc 08(Current Overload Protection)/Pc 44(Outdoor Unit Zero Speed Protection)
Service Manual - B-VMHxxAV-1 7.14 PC 08(Current overload protection)/PC 44(Outdoor unit zero speed protection)/ PC 46(Compressor speed has been out of control)/PC 49(Compressor overcurrent failure) diagnosis and solution Description: An abnormal current rise is detected by checking the specified current detection circuit. Recommended parts to prepare: •... - Page 126 Service Manual - B-VMHxxAV-1 Was the protection activated Was the protection activated in standby? in standby? Restart the unit when the power supply Restart the unit when the power supply Is the power voltage is normal? Is the power voltage is normal? returns to normal returns to normal Is outdoor terminal voltage...
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Page 127: Pc 0F(Pfc Module Protection Diagnosis And Solution)
Service Manual - B-VMHxxAV-1 7.15 PC 0F PFC module protection diagnosis and solution) Description: When the voltage signal that IPM send to compressor drive chip is abnormal, the LED displays the failure code and the AC turns off. Recommended parts to prepare: •... -
Page 128: Ec 72 (Lack Phase Failure Of Outdoor Dc Fan Motor Diagnosis And Solution)
Service Manual - B-VMHxxAV-1 7.16 EC 72 (Lack phase failure of outdoor DC fan motor diagnosis and solution) Description: When the three-phase sampling current of the DC motor is abnormal, especially when the current of one or more phases is always small and almost 0, the LED displays the failure code. Recommended parts to prepare: •... -
Page 129: Pc 43 (Outdoor Compressor Lack Phase Protection Diagnosis And Solution)
Service Manual - B-VMHxxAV-1 7.17 PC 43 (Outdoor compressor lack phase protection diagnosis and solution) Description: When the three-phase sampling current of the compressor is abnormal, especially when the current of one or more phases is always small and almost 0, the LED displays the failure code Recommended parts to prepare: •... -
Page 130: Pc 45 (Outdoor Unit Ir Chip Drive Failure Diagnosis And Solution)
Service Manual - B-VMHxxAV-1 7.18 PC 45 (Outdoor unit IR chip drive failure diagnosis and solution) Description: When the IR chip detects its own parameter error, the LED displays the failure code when power on. Recommended parts to prepare: • Inverter module PCB. Troubleshooting and repair: Power off,then restart the unit 2 minutes later. -
Page 131: Pc 30 (High Pressure Protection Diagnosis And Solution)
Service Manual - B-VMHxxAV-1 7.20 PC 30 (High pressure protection diagnosis and solution) Description: Outdoor pressure switch cut off the system because high pressure is higher than 4.4 MPa Recommended parts to prepare: • Connection wires • Pressure switch • Outdoor fan •... - Page 132 Service Manual - B-VMHxxAV-1 High pressure protection High pressure protection Are the high pressure switch Are the high pressure switch Connect high pressure switch and Connect high pressure switch and and main control boar wired and main control boar wired mian control board mian control board correctly?
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Page 133: Pc 0A (High Temperature Protection Of Condenser Diagnosis And Solution)
Service Manual - B-VMHxxAV-1 7.21 PC 0A (High temperature protection of condenser diagnosis and solution) Description: When the outdoor pipe temperature is more than 65°C, the unit stops. It starts again only when the outdoor pipe temperature is less than 52°C. Recommended parts to prepare: •... -
Page 134: Pc 06 (Discharge Temperature Protection Of Compressor Diagnosis And Solution)
Service Manual - B-VMHxxAV-1 7.22 PC 06 (Discharge temperature protection of compressor diagnosis and solution) Description: If the compressor discharge temperature exceeds a certain level for nine seconds, the compressor ceases operation, the LED displays the failure code Recommended parts to prepare: •... -
Page 135: Eh 0B(Communication Error Between Indoor Two Chips Diagnosis And Solution)
Service Manual - B-VMHxxAV-1 7.23 EH 0b(Communication error between indoor two chips diagnosis and solution) Description: Indoor PCB main chip does not receive feedback from another chip. Recommended parts to prepare: • Indoor main board • Adapter board Troubleshooting and repair: Shut off the power supply and turn it on 2 minutes later. -
Page 136: El 16(Communication Malfunction Between Adapter Board And Outdoor Main Board Diagnosis And Solution)
Service Manual - B-VMHxxAV-1 7.24 EL 16(Communication malfunction between adapter board and outdoor main board diagnosis and solution) Description: The adapter PCB cannot detect the main control board. Recommended parts to prepare: • Connection wires • Adapter board • Outdoor main PCB Troubleshooting and repair: Power off, then restart the unit after 3 minutes. -
Page 137: Eh B3 (Communication Error Between Wired Controller And Indoor Unit Diagnosis And Solution)
Service Manual - B-VMHxxAV-1 7.26 PC 41(Outdoor compressor current sampling circuit failure diagnosis and solution) Description: Three-phase sampling offset voltage error, the static bias voltage is normally 2.5V Recommended parts to prepare: • Outdoor main PCB Troubleshooting and repair: Shut off the power supply and turn it on 2 minutes later. -
Page 138: Check Procedures
Service Manual - B-VMHxxAV-1 8. Check Procedures 8.1 Temperature Sensor Check WARNING Be sure to turn off all power supplies or disconnect all wires to avoid electric shock. Operate after compressor and coil have returned to normal temperature in case of injury. 1. - Page 139 Service Manual - B-VMHxxAV-1 Resistance Value ASM135D23UFZ ATQ420D1UMU ASN98D22UFZ ATF235D22UMT ATQ360D1UMU Blue-Red Ω Blue-Black 1.75Ω 0.37Ω 0.75Ω 0.37Ω 1.57 Red-Black ATF250D22UMT Resistance Value ATM115D43UFZ2 ATF310D43UMT KSK103D33UEZ3 ASM98D32UFZ KTF250D22UMT Blue-Red Blue-Black 1.87Ω 0.75Ω 0.65Ω 2.13Ω 2.2Ω Red-Black Resistance Value ASN140D21UFZ ASK89D29UEZD KSN140D21UFZ KTM240D57UMT KSN140D58UFZ...
- Page 140 Service Manual - B-VMHxxAV-1 Note: The picture and the value are only for reference, actual condition and specific value may vary. 8.3 IPM Continuity Check WARNING Electricity remains in capacitors even when the power supply is off. Ensure the capacitors are fully discharged before troubleshooting. 1.
- Page 141 Service Manual - B-VMHxxAV-1 Note: The picture and the value are only for reference, actual condition and specific value may vary. Normal voltage of P and N 208-240V(1-phase,3-phase) 380-415V(3-phase) In standby around 310VDC around 530VDC In operation With passive PFC module With partial active PFC With fully active PFC module...
- Page 142 Service Manual - B-VMHxxAV-1 Indoor Unit Disassembly-Air Handle Contents Indoor Unit Disassembly ..................1 Electrical Parts ....................2 Fan Motor and Fan ..................5 Evaporator .....................7...
- Page 143 Service Manual - B-VMHxxAV-1 1. Indoor Unit Disassembly Electrical Parts (Antistatic gloves must be worn.) Procedure Illustration 1) Remove 2 screws of the upper cover Plate assembly and then remove the it. (see CJ_AHU_001) CJ_AHU_001 2) Remove 2 screws and unplug the plugs. (see CJ_AHU_002) 3) Pull out the electric control box subassembly.(see CJ_AHU_002)
- Page 144 Service Manual - B-VMHxxAV-1 Procedure Illustration 4) Release 2 fixing screws and 1earthing screw.(see CJ_AHU_003) 5) Unplug the plugs and then remove the main control board subassembly. (see CJ_AHU_003) CJ_AHU_003 6) Release 1 fixing screw of the data transfer module control board to remove it.
- Page 145 Service Manual - B-VMHxxAV-1 Procedure Illustration 7) Release 2 screws and then remove the transformer. (see CJ_AHU_005) CJ_AHU_005 Note: This section is for reference only. Actual unit appearance may vary. Indoor Unit Disassembly 4 ...
- Page 146 Service Manual - B-VMHxxAV-1 Fan Motor and Fan Procedure Illustration 1) Remove 2 screws of fan assembly (see CJ_AHU_006) CJ_AHU_006 2) Take out the fan assembly (see CJ_ AHU_007) CJ_AHU_007 Note: This section is for reference only. Actual unit appearance may vary. ...
- Page 147 Service Manual - B-VMHxxAV-1 Procedure Illustration 3) Release 3 nuts fixing the fan motor and then take out the fan motor. (see CJ_AHU_008) CJ_AHU_008 4) Release the 1 nut fixing the fan and then take out the fan. (see CJ_AHU_009) CJ_AHU_009 Note: This section is for reference only.
- Page 148 Service Manual - B-VMHxxAV-1 Evaporator Procedure Illustration 1) Remove the cover plate (see CJ_ AHU_010) CJ_AHU_010 2) Remove 3 screws of cover plate assembly(below) (see CJ_AHU_011) CJ_AHU_011 Note: This section is for reference only. Actual unit appearance may vary. Indoor Unit Disassembly 7 ...
- Page 149 Service Manual - B-VMHxxAV-1 Procedure Illustration 3) Take out the evaporator(with water collector assembly). (see CJ_AHU_012) CJ_AHU_012 4) Remove 2 screws of water collector assembly.(see CJ_AHU_013) 4) Release evaporator and the water collector assembly. CJ_AHU_013 Note: This section is for reference only. Actual unit appearance may vary. ...
- Page 150 Service Manual - B-VMHxxAV-1 Outdoor Unit Disassembly Contents Outdoor Unit Table ....................2 Outdoor Unit Disassembly ..................3 Panel Plate .....................3 Electrical Parts .....................1 1 0 0 Fan Assembly ....................1 1 3 3 Fan Motor ....................1 1 4 4 Sound Blanket .....................1 1 5 5 Four-way Valve ....................1 1 6 6 Compressor ....................1 1 7 7...
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Page 151: Outdoor Unit Table
Service Manual - B-VMHxxAV-1 1. Outdoor Unit Disassembly Outdoor Unit Table Outdoor Unit Model Panel Plate PCB Board 18AV-1 X430 PCB Board 3 24AV-1 PCB Board 10 Outdoor Unit Disassembly 2 ... - Page 152 Service Manual - B-VMHxxAV-1 2 2 . . O O u u t t d d o o o o r r U U n n i i t t D D i i s s a a s s s s e e m m b b l l y y 2 2 .
- Page 153 Service Manual - B-VMHxxAV-1 Procedure Illustration 4) Remove the screws of water collecting cover and then remove the water collecting cover (2 screws) (see CJ_ X430_003). Water Collecting Cover CJ_X430_003 5) Remove the screws of the front panel and then remove the front panel (7 screws(onoff models) or 9 screws(inverter models) (see CJ_ X430_004).
- Page 154 Service Manual - B-VMHxxAV-1 Procedure Illustration 6) Remove the screws of the right panel and then remove the right panel (6 screws) (see CJ_X430_005). Right Panel CJ_X430_005 Note: This section is for reference only. Actual unit appearance may vary. Outdoor Unit Disassembly 5 5 ...
- Page 155 Service Manual - B-VMHxxAV-1 2 2 . D30 Procedure Illustration 1) Turn off the air conditioner and the Big Handle power breaker. 2) Remove the screws of the big handle and then remove the big handle (2 screws) (see CJ_D30_001). CJ_D30_001 3) Remove the screws of the top cover and then remove the top cover (4...
- Page 156 Service Manual - B-VMHxxAV-1 Procedure Illustration 4) Remove the screws of the front right panel and then remove the front right panel (2 screws) (see CJ_D30_003). Front Right Panel CJ_D30_003 5) Remove the screws of the front panel and then remove the front panel (9 screws) (see CJ_D30_004).
- Page 157 Service Manual - B-VMHxxAV-1 Procedure Illustration 6) Remove the screws of water collecting cover and then remove the water collecting cover (2 screws) (see CJ_ D30_005). Water Collecting Cover CJ_D30_005 7) Remove the screws of the rear net and then remove the rear net (2 screws) (see CJ_D30_006).
- Page 158 Service Manual - B-VMHxxAV-1 Procedure Illustration 8) Remove the screws of the right panel and then remove the right panel (8 screws) (see CJ_D30_007). Right Panel CJ_D30_007 Note: This section is for reference only. Actual unit appearance may vary. Outdoor Unit Disassembly 9 9 ...
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Page 159: Electrical Parts
Service Manual - B-VMHxxAV-1 Electrical parts Antistatic gloves must be worn when you disassemble the electronic box. WARNING: Note: Remove the air outlet grille(refer to 3.1 Panel Plate) before disassembling electrical parts. 1 1 . . P P C C B B b b o o a a r r d d 3 3 Procedure Illustration 1) Remove the screws and unfix the... - Page 160 Service Manual - B-VMHxxAV-1 2 2 . PCB board 10 Procedure Illustration 1) Unfix the hooks and then open the electronic control box cover (4 hooks) (see CJ_ODU_PCB_010-1 ). CJ_ODU_PCB_010-1 2) Remove 6 screws on the electronic control board and then remove the electronic control box subassembly.
- Page 161 Service Manual - B-VMHxxAV-1 Procedure Illustration 3) Pull out the connector, remove one screw and then remove the key board subassembly on terminal board. (see CJ_ODU_PCB_010-3 ) (for some models). CJ_ODU_PCB_010-3 Note: This section is for reference only. Actual unit appearance may vary. Outdoor Unit Disassembly 1 1 2 2 ...
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Page 162: Fan Assembly
Service Manual - B-VMHxxAV-1 2.3 Fan Assembly Note: Remove the panel plate (refer to 3.1 Panel Plate) before disassembling fan. Procedure Illustration 1) Remove the nut securing the fan with a spanner (see CJ_ODU_ FAN_001-1&2). 2) Remove the fan. CJ_ODU_FAN_001-1 CJ_ODU_FAN_001-2 Note: This section is for reference only. -
Page 163: Fan Motor
Service Manual - B-VMHxxAV-1 Fan Motor Note: Remove the panel plate and the connection of fan motor on PCB (refer to 3.1 Panel Plate and 3.2 Electrical parts) before disassembling fan motor. Procedure Illustration 3) Remove the fixing screws of the fan motor (4 screws) (see CJ_ODU_MOTOR_001). -
Page 164: Sound Blanket
Service Manual - B-VMHxxAV-1 Sound blanket Note: Remove the panel plate (refer to 3.1 Panel plate) before disassembling sound blanket. Procedure Illustration 1) Remove the sound blanket (side and top) (see CJ_ODU_BLANKET_001). Sound Blanket(top) (Applicable to models with blanket) Sound Blanket(side) (Applicable to models with blanket) CJ_ODU_BLANKET_001 Note: This section is for reference only. -
Page 165: Four-Way Valve
Service Manual - B-VMHxxAV-1 Four-way valve (for heat pump models) WARNING: Evacuate the system and confirm that there is no refrigerant left in the system before removing the four-way valve and the compressor. (For R32 & R290, you should evacuate the system with the vacuum pump; flush the system with nitrogen;... -
Page 166: Compressor
Service Manual - B-VMHxxAV-1 2.7 Compressor WARNING: Evacuate the system and confirm that there is no refrigerant left in the system before removing the four-way valve and the compressor. (For R32 & R290, you should evacuate the system with the vacuum pump; flush the system with nitrogen;... - Page 167 Service Manual - B-VMHxxAV-1 Procedure Illustration 3) Remove the hex nuts and washers securing the compressor, located on the bottom plate (see CJ_ODU_COMP_003). CJ_ODU_COMP_003 Suction Pipe 4) Heat up the brazed parts and then remove the the discharge pipe and the suction pipe (see CJ_ODU_COMP_004).
- Page 168 Service Manual - B-VMHxxAV-1 Appendix Contents Temperature Sensor Resistance Value Table for T1, T2, T3, and T4 (°C – K) ..2 Temperature Sensor Resistance Value Table for TP (for some units)(°C --K) ..3 iii) Pressure On Service Port ..................4...
- Page 169 Service Manual - B-VMHxxAV-1 i) Temperature Sensor Resistance Value Table for T1,T2,T3 and T4 (°C – K) °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm 115.266 12.6431 2.35774 0.62973 108.146 12.0561 2.27249 0.61148 101.517 11.5...
- Page 170 Service Manual - B-VMHxxAV-1 ii) Temperature Sensor Resistance Value Table for TP(for some units) (°C --K) °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm...
- Page 171 Service Manual - B-VMHxxAV-1 iii) Pressure On Service Port Cooling chart(R410A): ODU(DB) °F(°C) 0(-17) 5(-15) 95 (35) (-9.44) (7.22) (23.89) (29.44) (40.56) (46.11) (48.89) IDU(DB/WB) 70/59 (21.11/15) 10.1 10.6 75/63 (23.89/17.22) 10.7 11.2 80/67 (26.67/19.44) 11.2 11.9 90/73 (32.22/22.78) 10.5 10.3 10.0 10.6...
- Page 172 Service Manual - B-VMHxxAV-1 Heating chart(R410A): ODU(DB/WB) 57/53 47/43 37/33 27/23 17/13 (-8.33/- 0/-2 -17/-18 °F(°C) (13.89/11.67) (8.33/6.11) (2.78/0.56) (-2.78/-5) 10.56) (-17/-19) (-27/-28) IDU(DB) 55(12.78) 30.3 28.5 25.3 22.8 20.8 18.5 16.5 65(18.33) 32.5 30.0 26.6 25.4 23.3 20.5 19.0 75(23.89) 33.8 31.5...
- Page 173 Service Manual - B-VMHxxAV-1 Cooling chart(R22): ODU(DB) °F(°C) 0(-17) 5(-15) 95 (35) (-9.44) (7.22) (23.89) (29.44) (40.56) (46.11) (48.89) IDU(DB/WB) 70/59 (21.11/15) 75/63 (23.89/17.22) 80/67 (26.67/19.44) 90/73 (32.22/22.78) 70/59 (21.11/15) 75/63 (23.89/17.22) 80/67 (26.67/19.44) 90/73 (32.22/22.78) 70/59 (21.11/15) 0.40 0.41 0.46 0.50 0.51...
- Page 174 Service Manual - B-VMHxxAV-1 Heating chart(R22): ODU(DB/WB) 57/53 47/43 37/33 27/23 17/13 (-8.33/- 0/-2 -17/-18 °F(°C) (13.89/11.67) (8.33/6.11) (2.78/0.56) (-2.78/-5) 10.56) (-17/-19) (-27/-28) IDU(DB) 55(12.78) 18.9 17.8 15.8 14.3 13.0 11.6 10.3 65(18.33) 20.3 18.8 16.6 15.9 14.6 12.8 11.9 75(23.89) 21.1 19.7...
- Page 175 Service Manual - B-VMHxxAV-1 Cooling chart(R32): ODU(DB) °F(°C) 0(-17) 5(-15) 95 (35) (-9.44) (7.22) (23.89) (29.44) (40.56) (46.11) (48.89) IDU(DB/WB) 70/59 (21.11/15) 10.3 10.8 75/63 (23.89/17.22) 10.9 11.4 80/67 (26.67/19.44) 11.4 12.1 90/73 (32.22/22.78) 10.7 10.5 10.2 10.8 12.6 13.3 70/59 (21.11/15) 75/63 (23.89/17.22) 80/67 (26.67/19.44)
- Page 176 Service Manual - B-VMHxxAV-1 Heating chart(R32): ODU(DB/WB) 57/53 47/43 37/33 27/23 17/13 (-8.33/- 0/-2 -17/-18 °F(°C) (13.89/11.67) (8.33/6.11) (2.78/0.56) (-2.78/-5) 10.56) (-17/-19) (-27/-28) IDU(DB) 55(12.78) 30.9 29.1 25.8 23.3 21.2 18.9 16.8 65(18.33) 33.2 30.6 27.1 25.9 23.8 20.9 19.4 75(23.89) 34.5 32.1...
- Page 177 Service Manual - B-VMHxxAV-1 System Pressure Table-R22 Pressure Temperature Pressure Temperature °C °F °C °F 14.5 -41.091 -41.964 1600 41.748 107.146 21.75 -32.077 -25.739 1650 16.5 239.25 43.029 109.452 -25.177 -13.319 1700 246.5 44.281 111.706 36.25 -19.508 -3.114 1750 17.5 253.75 45.506 113.911...
- Page 178 Service Manual - B-VMHxxAV-1 System Pressure Table-R410A Pressure Temperature Pressure Temperature °C °F °C °F 14.5 -51.623 -60.921 2350 23.5 340.75 38.817 101.871 21.75 -43.327 -45.989 2400 39.68 103.424 -36.992 -34.586 2450 24.5 355.25 40.531 104.956 36.25 -31.795 -25.231 2500 362.5 41.368 106.462...
- Page 179 Service Manual - B-VMHxxAV-1 System Pressure Table-R32 Pressure Temperature Pressure Temperature °C °F °C °F 14.5 -51.909 -61.436 1850 18.5 268.25 28.425 83.165 21.75 -43.635 -46.543 1900 275.5 29.447 85.005 -37.323 -35.181 1950 19.5 282.75 30.448 86.806 36.25 -32.15 -25.87 2000 31.431 88.576...
- Page 180 Service Manual - B-VMHxxAV-1 1900 Wellworth Ave., Jackson, MI 49203 • Ph. 517-787-2100 • www.marsdelivers.com 5/2022...