Carrier 37VMH-1P Service Manual
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Carrier 37VMH-1P Service Manual

Carrier 37VMH-1P Service Manual

Full dc inverter for variable refrigerant flow (vrf) sizes 36k-60k
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Table of Contents

GENERAL INFORMATION ..................................................... 2
ACCESSORIES .......................................................................... 5
SPECIFICATIONS ..................................................................... 8
DIMENSIONS ............................................................................ 9
CLEARANCE SPACE REQUIREMENTS ............................. 10
ELECTRICAL CHARACTERISTICS ..................................... 11
CONTROL................................................................................ 22
FIELD SETTINGS.................................................................... 37
OPERATING LIMITS.............................................................. 58
SOUND LEVELS ..................................................................... 59
DIAGNOSTICS AND TROUBLESHOOTING....................... 61
Fig. 1 -Unit Image (Size 036)
Full DC Inverter for Variable Refrigerant Flow (VRF)
Service Manual
NOTE: Carrier is committed to continuously improving its
Specifications subject to change without notice.
Fig. 2 -Unit Image (Size 048/060)
products to ensure the highest quality and
reliability standards, and to meet local regulations
and market requirements. All features and
specifications are subject to change without prior
notice.
37VMH-1P
Sizes 36K-60K

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Summary of Contents for Carrier 37VMH-1P

  • Page 1: Table Of Contents

    SOUND LEVELS ..............59 DIAGNOSTICS AND TROUBLESHOOTING....... 61 Fig. 2 —Unit Image (Size 048/060) NOTE: Carrier is committed to continuously improving its products to ensure the highest quality and reliability standards, and to meet local regulations and market requirements. All features and Fig.

  • Page 2: General Information

    37VMH-1P: Service Manual GENERAL INFORMATION INDOOR AND OUTDOOR UNIT CAPACITIES Indoor Units Table 1 — Indoor unit abbreviation codes Abbreviation Code Type 45VMC Compact Four-way Cassette 45VMF Four-way Cassette 45VML Low Static Pressure Duct 45VMM Medium Static Pressure Duct 45VMW...

  • Page 3: External Appearance

    37VMH-1P: Service Manual EXTERNAL APPEARANCE Indoor Units Table 4 — Indoor unit appearance Compact Four-way Cassette Four-way Cassette 45VMC 45VMF Low Static Pressure Duct Medium Static Pressure Duct 45VML 45VMM Wall-mounted 45VMV 45VMW Outdoor Units Table 5 — Outdoor unit appearance...
  • Page 4 37VMH-1P: Service Manual NOMENCLATURE Indoor Units F 007 Equipment Type Electrical 45 — Indoor Fan Coil Unit 3 — 208/230-1-60 Product Type Not Defined VM — Carrier VRF - — Blank Model Number Modifier Not Defined A — Outside Air - —...

  • Page 5: Accessories

    37VMH-1P: Service Manual COMBINATION RATIO Table 6 — Indoor and outdoor unit combination ratio limitations Units (kBtu/h) Minimum combination ratio Maximum combination ratio 36/48/60 130% Table 7 — Combinations of Indoor and outdoor units Outdoor unit capacity Sum of capacity indexes of connected...

  • Page 6: Selection Procedure

    37VMH-1P: Service Manual SELECTION PROCEDURE Design temperature and humidity (indoor and outdoor) Required heat load of each room System peak load Piping length, level differences Indoor unit specifications (type and quantity) Room(i) area Adjust the piping length, reduce the refrigerant charge...
  • Page 7 37VMH-1P: Service Manual Fig. 4 —Selection Procedure (Cont.) Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

  • Page 8: Specifications

    37VMH-1P: Service Manual SPECIFICATIONS Table 9 — Specifications - All Sizes 3Ton 4Ton 5Ton Sale Model 37VMH036HDS3 37VMH048HDS3 37VMH060HDS3 Power supply 208/230V-60Hz With Unitary Ducted Indoor Btu/h 34000 48000 52000 Cooling Capacity With VRF Ductless Indoor Btu/h 36000 48000 60000...

  • Page 9: Dimensions

    37VMH-1P: Service Manual DIMENSIONS Front View Top View Fig. 5 —3.0 ton unit Front View Top View Fig. 6 —4.0 / 5.0 ton unit Table 10 — Dimensions Model (Ton) 40-11/16 17-1/16 16-1/8 7-1/2 25-13/16 20-9/16 4.0/5.0 35-5/8 38-1/2 13-7/8...

  • Page 10: Clearance Space Requirements

    37VMH-1P: Service Manual CLEARANCE SPACE REQUIREMENTS (Wall or partition) Air Inlet 12 (305) Minimum (305) Minimum (610) Air inlet Minimum (Service Front of Unit Clearance) 79 (2007) Air Outlet Minimum Fig. 7 —Single Unit Installation NOTE: If unit is surrounded on three or four sides by walls or partitions that are taller than 10ft (3m), call your dealer to discuss additional requirements.

  • Page 11: Electrical Characteristics

    37VMH-1P: Service Manual ELECTRICAL CHARACTERISTICS Table 11 — Outdoor Unit Electrical Characteristics Power Supply Compressor Model Min. Max. Volts volts volts MDV-V36WMN10T 60Hz 208/230 16.5 0.215 MDV-V48WMN10T 60Hz 208/230 19.0 0.123*2 1.1*2 MDV-V60WMN10T 60Hz 208/230 24.0 0.123*2 1.1*2 Legend: MCA: Minimum Circuit Amps...

  • Page 12: Component Layout And Refrigerant Circuits12

    37VMH-1P: Service Manual COMPONENT LAYOUT AND REFRIGERANT CIRCUITS LAYOUT OF FUNCTIONAL COMPONENTS Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 13 37VMH-1P: Service Manual 4.0/5.0 ton layout of functional components Fig. 10 —4.0/5.0 ton layout of functional components Table 12 — Legend Parts Name Compressor Oil separator High pressure switch High pressure sensor One way valve 4-way valve(ST1) Heat exchanger Electronic expansion valve (EEVA)

  • Page 14: Piping Diagrams

    37VMH-1P: Service Manual PIPING DIAGRAMS 1.5/2.0 ton piping diagram Fig. 11 —1.5/2.0 ton piping diagram Table 13 — Legend Parts Name Parts Name Compressor Electronic expansion valve (EEVD) One-way valve Services valve High pressure switch Fusible plug Four-way valve Low pressure switch 18.1-18.3...
  • Page 15 37VMH-1P: Service Manual 2.5/3.0 ton piping diagram Liquid stop valve EEVA GLQ2 GLQ1 20.1 20.2 Gas stop valve GLQ3 20.3 EEVD GLQ2 20.4 T7C1 20.5 INV1 Fig. 12 —2.5/3.0 ton piping diagram Table 14 — Legend Parts name Parts name...
  • Page 16 37VMH-1P: Service Manual 4.0/5.0 ton piping diagram Liquid stop valve EEVA GLQ2 GLQ1 20.1 20.2 Gas stop valve GLQ3 20.3 EEVD GLQ2 20.4 T7C1 20.5 INV1 Fig. 13 —4.0/5.0 ton piping diagram Table 15 — Legend Parts name Parts name...
  • Page 17 37VMH-1P: Service Manual Key components 1. Oil separator: Separates oil from gas refrigerant pumped out of the compressor and quickly returns it to the compressor. Separation efficiency is up to 99%. Gas-liquid separator: Separates liquid refrigerant from gas refrigerant, stores liquid refrigerant and oil to protect compressor from liquid hammering.

  • Page 18: Refrigerant Flow Diagrams

    37VMH-1P: Service Manual REFRIGERANT FLOW DIAGRAMS COOLING OPERATION Fig. 14 —Refrigerant flow during cooling operation Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

  • Page 19: Heating Operation

    37VMH-1P: Service Manual REFRIGERANT FLOW DIAGRAMS HEATING OPERATION Fig. 15 —Refrigerant flow during heating operation Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

  • Page 20: Oil Return Operation

    37VMH-1P: Service Manual OIL RETURN OPERATION COOLING MODE Fig. 16 —Refrigerant flow during oil return operation in cooling mode Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 21 37VMH-1P: Service Manual OIL RETURN / DEFROSTOPERATION HEATING MODE Fig. 17 —Refrigerant flow during oil return defrost operation in heating mode Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

  • Page 22: Control

    37VMH-1P: Service Manual CONTROL STOP OPERATION The stop operation occurs for one of the four following reasons: 1. Abnormal shutdown: in order to protect the compressors, if an abnormal state occurs, the system will makes a 'stop with thermos-off' operation and an error code will be displayed on the outdoor unit digital displays.

  • Page 23: Startup Control

    37VMH-1P: Service Manual STARTUP CONTROL a. Third-part AHU start control Outdoor unit receives 24V electrical signal from thermostat and determines operation mode. Continuous square signal from 30 to 80 Hz which lasts more than 3 seconds is effective signal. O type: When thermostat is set with O type, and run into cooling mode, it will send 24V electrical signal from O/B and Y port on thermostat to B and Y port on signal board of outdoor unit.

  • Page 24: Normal Operation Control

    37VMH-1P: Service Manual NORMAL OPERATION CONTROL d. Component Control during Normal Operation Table 19 — Outdoor unit component control during normal operation Function of Functional Part Part Name Symbol Cooling Heating Pressure control: Compressor is used to maintain constant evaporating pressure in cooling...
  • Page 25 37VMH-1P: Service Manual b. Compressor Control Cooling operation Compressor frequency is controlled to keep IDU evaporating pressure (Te) at target pressure (Tes). • The default target pressure in cooling mode is 39.2℉, which could be changed by menu settings on main board;...
  • Page 26 37VMH-1P: Service Manual Heating operation Compressor frequency is controlled to keep IDU condensing pressure (Tc) at target pressure (Tcs). • The default target pressure in heating mode is 46°C, which could be changed by menu settings on main board; • Target condensing pressure would increase if heating capacity of indoor unit is too low;...
  • Page 27 37VMH-1P: Service Manual Operating frequency ranges During normal operation, the minimum frequency is always 18Hz for all outdoor units and the maximum one is limited as the table below. Table 21 — Outdoor unit frequency ranges during operation Frequency Range in Cooling or main...
  • Page 28 37VMH-1P: Service Manual e. Outdoor Fan Control The speed of the outdoor unit fans is adjusted in steps, as shown in Table 24. Table 23 — Outdoor fan speed steps Fan speed (rpm) Fan speed index 2.5/3.0ton 1.5/2.0ton 2.5/3.0ton FANA FANB Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

  • Page 29: Special Control

    37VMH-1P: Service Manual SPECIAL CONTROL Oil Return Operation In order to prevent compressors from running out of oil, the oil return operation is conducted to recover oil that has flowed out of the compressor and into the piping system. This operation is performed for all units including units that are in standby.
  • Page 30 37VMH-1P: Service Manual Table 27 — Outdoor unit component control during defrosting operation Symb Step1 Step2 Step3 Part Name Prepare for oil returning Oil returning After oil returning Inverter compressor Decrease to 32Hz 45-82 Hz Start platform Inverter fan 1...
  • Page 31 37VMH-1P: Service Manual 5. Enter refrigerant auto-charging mode from outdoor unit menu: Fig. 23 —Enter refrigerant auto-charging mode from outdoor unit menu NOTES: 1. During refrigerant auto-charging, do not power off the system. 2. The refrigerant charging amount should be calculated and recorded.
  • Page 32 37VMH-1P: Service Manual The situation below could lead to a display of “FAIL” on LED after entering refrigerant auto-charging mode. Be sure to check: 1. The refrigerant auto-charging time is too long Table 30 — Auto-Charge Time Auto-charging time (min.) °...
  • Page 33 37VMH-1P: Service Manual Chassis electric heating belt control Chassis electric heating belt control is used to prevent chassis from being freeze by condensate water and ice rain, when ambient temperature is less than 89.6℉. Accumulated ice on chassis would block drain hole and damage condenser, which can melted by electrical heating.
  • Page 34 37VMH-1P: Service Manual Test Operation Control Test operation is used to debug malfunction because of incorrect installation. Press “1-1-2” on PCB to enter test operation. Basic procedure of test operation Before entering test operation, debug malfunction in stop mode, such as temperature sensor error, communication error and so on.
  • Page 35 37VMH-1P: Service Manual Table 31 — Error code during test operation Test item Object Malfunction reason Error code T1 < 109.4Ń T4 < -22Ń Outdoor ambient temperature T1 ≥ 53.6Ń and T4 ≥ 131Ń T1 < 53.6Ń and T4 ≥ 86Ń...
  • Page 36 37VMH-1P: Service Manual Operation Limits Control Before compressors are about to start, the outdoor unit judge whether it’s suitable to operate or not by the value of ambient temperature (T4). Fig. 26 —Operational Limits Control NOTE: When T4 < 23°F, there is a minimum operating capacity for cooling start and operation, which is 50%.

  • Page 37: Field Settings

    37VMH-1P: Service Manual FIELD SETTINGS Overview This chapter describes how the system configuration can be implemented once the installation is completed, and other relevant information. It contains the following information: • Implement field settings • Energy-saving and optimized operation • Using the Check function NOTE: Installation personnel should read this section.
  • Page 38 37VMH-1P: Service Manual Fig. 29 —Menu Mode Selection Flowchart Table 36 — Menu mode function: Second level Specified menu First level menu Description Default menu mode Query History error (last ten error codes) (History error) Cleaning history error (Information Query Indoor unit's address...
  • Page 39 37VMH-1P: Service Manual Table 37 — Menu Mode Function (Cont.) First level Second level Specified menu Description Default menu menu mode Automatic priority mode √ Cooling priority mode VIP indoor unit voting priority mode 0[1] In response to heating mode only...
  • Page 40 37VMH-1P: Service Manual Table 38 — Menu mode function (continue) First level Second level Specified menu Defaul Description menu menu mode Evaporation temperature setting (Ke0=-3) Evaporation temperature setting (Ke0=0) Evaporation temperature setting (Ke0=2) Evaporation temperature setting (Ke0=4) √ (target evaporation...
  • Page 41 37VMH-1P: Service Manual Table 39 — Menu Mode Function (Continue) First level Second level Specified menu Description Default menu menu mode 28°F heataux operate temperature 36°F heataux operate temperature 43°F heataux operate temperature 50°F heataux operate temperature n8[1] (heat-auxiliary 59°F heataux operate temperature operate) 68°F heataux operate temperature...
  • Page 42 37VMH-1P: Service Manual Table 40 — Function of switch ENC1 Switch Setting Switch positions Description Outdoor unit model setting (Valid at 0-5 ,default is 0) 0 - MDV-V18WMN10T 1 - MDV-V24WMN10T ENC1 Model setting 2 - MDV-V30WMN10T 3 - MDV-V36WMN10T...
  • Page 43 37VMH-1P: Service Manual Cooling priority mode ODU in heating mode If ODU receive cooling demand, ODU will stop and turn to operate in cooling mode. The indoor units with heating demand are thermo-OFF and display “not priority”. ODU in cooling mode If ODU receive heating demand, ODU will continue to operate in cooling mode.
  • Page 44 37VMH-1P: Service Manual Fig. 30 —Test Operation Control Table 43 — Error Code During Test Operation Test item Object Malfunction reason Error code T1 < 109.4Ń T4 < -22Ń Outdoor ambient temperature T1 ≥ 53.6Ń and T4 ≥ 131Ń T1 < 53.6Ń and T4 ≥ 86Ń...
  • Page 45 37VMH-1P: Service Manual SYSTEM PARAMETER CHECK UP / DOWN System Check Button Before pressing UP or DOWN button, allow the system to operate steadily for more than an hour. On pressing UP or DOWN button, the parameters listed in below table will be displayed in sequence.
  • Page 46 37VMH-1P: Service Manual Table 45 — System Check List (Cont.) DISP. CONTENT DESCRIPTION EEVD position Actual Value=DISP. *4 High pressure of unit Actual Pressure=DISP. /100 Unit: MPa Low pressure of unit Actual Pressure=DISP. /100 Unit: MPa Quantity of online IDUs...

  • Page 47: Electrical Components And Wiring Diagrams47

    37VMH-1P: Service Manual ELECTRICAL COMPONENTS AND WIRING DIAGRAMS OUTDOOR UNIT ELECTRIC CONTROL BOX LAYOUT Fig. 31 —1.5/2.0 ton electric control box Fig. 32 —2.5/3.0 ton electric control box Fig. 33 —4.0/5.0 ton electric control box Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 48 37VMH-1P: Service Manual OUTDOOR UNIT MAIN CONTROL BOARD PORTS Fig. 34 —Outdoor unit main control board ports NOTE: Label descriptions are given in Table 46. Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 49 37VMH-1P: Service Manual Table 46 — Main Control Board Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 50 37VMH-1P: Service Manual OOUTDOOR UNIT MAIN CONTROL BOARD COMPONENTS Fig. 35 —Outdoor Unit Main Control Board Components Table 47 — Function of buttons SW3 to SW6 Button Function In menu mode: previous and next buttons for SW3 (UP) menu modes.
  • Page 51 37VMH-1P: Service Manual COMPRESSOR AND FAN DRIVE BOARD Fig. 36 —1.5/2.0 Ton Compressor and Fan Drive Board Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 52 37VMH-1P: Service Manual Fig. 37 —2.5 / 3.0 Ton Compressor and Fan Drive Board Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 53 37VMH-1P: Service Manual Fig. 38 —4.0 / 5.0 Ton Compressor and Fan Drive Board Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

  • Page 54: Wiring Diagrams

    37VMH-1P: Service Manual WIRING DIAGRAMS Fig. 39 —1.5 / 2.0 Ton Wiring Diagram Table 49 — Legend Code Name Code Name COMP Compressor High pressure sensor EEVA/D Electronic expansion valve Low pressure sensor DC Fan Heat exchanger middle temperature sensor...
  • Page 55 37VMH-1P: Service Manual Fig. 40 —2.5 / 3.0 Ton Wiring Diagram Table 50 — Legend Code Name Code Name COMP Compressor Low pressure sensor EEVA/D Electronic expansion valve Heat exchanger temperature sensor DC Fan Outdoor ambient temperature sensor HEAT Crankcase heater...
  • Page 56 37VMH-1P: Service Manual Fig. 41 —4.0 / 5.0 Ton Wiring Diagram Table 51 — Legend Code Name Code Name COMP Compressor Low pressure sensor EEVA/D Electronic expansion valve Heat exchanger temperature sensor FAN_UP/ DC Fan Outdoor ambient temperature sensor FAN_DOWN...

  • Page 57: Cooling Capacity <

    37VMH-1P: Service Manual COOLING CAPACITY <<Get tables in Excel>> Table 52 — 3 Ton Capacity Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

  • Page 58: Operating Limits

    37VMH-1P: Service Manual OPERATING LIMITS Fig. 42 —Operating Limits Note1: Outdoor operating temperature under 23 ºF in "Cool" mode, the startup capacity of indoor units must meet at least 50% of outdoor unit capacity. Table 53 — Operating Limits (ºF)

  • Page 59: Sound Levels

    37VMH-1P: Service Manual SOUND LEVELS Table 54 — Sound Pressure Level Mode Outdoor Temperature Room Temperature 37MVH036HDS3 37MVH048HDS3 37MVH060HDS3 NOTE: Sound pressure level is measured at a position 1m in front of the unit and Hm above the floor in a semi-anechoic chamber.
  • Page 60 37VMH-1P: Service Manual NC-70 NC-60 NC-50 NC-40 NC-30 NC-20 63 • • 125 • • 250 • • 500 • • 1000 • • 2000 • • 4000 • • 8000 Fig. 45 —4 Ton Unit NC-70 NC-60 NC-50 NC-40...

  • Page 61: Diagnostics And Troubleshooting

    37VMH-1P: Service Manual DIAGNOSTICS AND TROUBLESHOOTING Table 55 — Outdoor Error Codes Error code Error description Manual re-start require Emergency stop Indoor unit refrigerant leakage Recover refrigerant after refrigerant leakage and shut down Refrigerant shut-off device error Communication error between indoor and outdoor unit...
  • Page 62 37VMH-1P: Service Manual Table 56 — Installation and Debugging Error Codes Error code Error description Manual re-start require Technology barrier Unit type is not set Capacity setting error Indoor unit type setting error Indoor unit with old platform in the system...
  • Page 63 37VMH-1P: Service Manual Table 59 — Status Codes Error code Error description Manual re-start require Oil return running, x represents oil return operation steps Defrost running, x represents defrosting operation steps Refrigerant judgment, no result Refrigerant quantity judgment, Significantly excessive...
  • Page 64 37VMH-1P: Service Manual A11: Refrigerant Leakage Error Definition and inspection of faults: Refrigerant leakage occurs Probable causes: • Refrigerant leakage occurs • Malfunction of refrigerant detection sensor 1b01/4b01: Electronic Expansion Valve (EEVA/D) Error Definition and inspection of faults: • The electronic expansion valve signal was not detected by the mainboard for 2 minutes Probable causes: •...
  • Page 65 37VMH-1P: Service Manual C21: Communication error between indoor units and outdoor unit Definition and inspection of faults • Outdoor unit can’t communicate with indoor units Probable causes • Communication cables between ODU and IDUs are unstably or wrongly connected, or in short circuit.
  • Page 66 37VMH-1P: Service Manual C26/C28: Number of indoor units detected by the outdoor unit has decreased/increased Definition and inspection of faults • The total number of IDUs set in commission is not the same as the actual detected total ones Probable causes •...
  • Page 67 37VMH-1P: Service Manual E41/F41/F91/FA1/FC1/Fd1: T4/T3/T3B/T5/TL/Tg error (open/short) Definition and inspection of faults • The temperature sensor (T4/T3/T7C/T5/T8/TL/T7) has short circuit or open circuit. • Detective voltage > 4.95V or < 0.05V Probable causes • Contact failure between sensor and main board •...
  • Page 68 37VMH-1P: Service Manual F71: Discharge temperature sensor error (open/short) Definition and inspection of faults • The discharge temperature sensor (T7C) has short circuit or open circuit. • Detective voltage > 4.95V or < 0.05V Probable causes • Contact failure between sensor and main board •...
  • Page 69 37VMH-1P: Service Manual F62/F6A: Inverter module temperature (Tf) protection Definition and inspection of faults • NTC temperature is higher than 100°C Probable causes • Poor contact between driver board and cooler • Lack of silicone thermal grease • Defective driver board •...
  • Page 70 • Defective main board • Lack of cooling function caused by the EEV in ODU • The refrigerant blocked in high pressure zone owing to the faulty valve © 2025 Carrier. All rights reserved. Edition Date: 04/25 Catalog No: 37VMH-1P-01SM Replaces: NEW Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

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