Carrier 38VMH-1P Service Manual
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Carrier 38VMH-1P Service Manual

Outdoor units for variable refrigerant flow vrf heat pump system
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38VMH-1P (036-060)
Outdoor Units for
Variable Refrigerant Flow (VRF) Heat Pump System
Service Manual
A210217
Form No: 38VMH-1P-3SM
© 2021 Carrier. All rights reserved.
Edition Date: 07/21
A Carrier Company
Printed in USA
Replaces: 38VMH-1P-2SM
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
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Summary of Contents for Carrier 38VMH-1P

  • Page 1 Outdoor Units for Variable Refrigerant Flow (VRF) Heat Pump System Service Manual A210217 Form No: 38VMH-1P-3SM © 2021 Carrier. All rights reserved. Edition Date: 07/21 A Carrier Company Printed in USA Replaces: 38VMH-1P-2SM Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

  • Page 2: Table Of Contents

    TABLE OF CONTENTS GENERAL INFORMATION...................................3 Model Number of Outdoor Unit / Indoor Unit............................3 Connected Capacity Ratio Restrictions..............................4 External Appearance....................................5 Piping Design......................................6 Refrigerant Charge Calculation................................12 REFRIGERANT CIRCUIT..................................13 Refrigerant Circuit....................................14 Refrigerant flow for Each Operation Mode............................15 FIELD WIRING.......................................18 Typical Power Supply Wiring ................................19 Typical Control Wiring ..................................

  • Page 3: General Information

    GENERAL INFORMATION Model Number of Outdoor / Indoor Units A210214 Fig. 1 —Outdoor Units Table 1 —Outdoor Unit Nomenclature Capacity 3 Ton 4 Ton 5 Ton 38VMB036HDS3-1 38VMB048HDS3-1 38VMB060HDS3-1 Model Number Nominal Capacity 50% - 130% 50% - 130% 50% - 130% Connected Capacity Indoor Unit Connectable Max.

  • Page 4: Connected Capacity Ratio Restrictions

    Table 2 —Indoor Unit Capacity Chart CONNECTABLE INDOOR UNIT CAPACITY INDEX* 1-Way Cassette 40VMI • • • • • • • 4-Way Cassette 40VMF • • • • • • • • Compact 4-way Cassette 40VMC • • • • •...

  • Page 5: External Appearance

    External Appearance OUTDOOR UNIT A210217 Fig. 3 —38VMH-Heat Pump INDOOR UNITS LINEUP Figure 4 - 1-Way Cassette Figure 5 - 4-Way Cassette Figure 6 - Compact 4-Way Cassette A210219 A210220 A210221 (40VMI) (40VMF) (40VMC) Figure 8 - High Wall Figure 7 - High Static Duct Figure 9 - Low Static Duct A210223 A210222...

  • Page 6: Piping Design

    Piping Design Case 1 A210229 Fig. 15 —Piping Design - Case 1 • Bends in piping cause pressure loss during transportation of the refrigerant, so fewer bends increase performance. • The equivalent length of each bend is 1.64 feet. • The equivalent length of each Y-Joint is 1.64 feet. •...
  • Page 7 Case 2 A210230 Fig. 16 —Piping Design (Case 2) • Bends in piping cause pressure loss during transportation of refrigerant, so fewer bends increase performance. • The equivalent length of each bend is 1.64 feet. • The equivalent length header is 1.64 feet. •...
  • Page 8 Case 3 A210231 • Bends in piping cause pressure loss during transportation of refrigerant, so fewer bends increase performance. • The equivalent length of each bend is 1.64 feet. • The equivalent length of each Y-Joint or header is 1.64 feet. •...
  • Page 9 Case 4 A210232 Fig. 17 —Piping Design (Case 4) • Bends in piping cause pressure loss during transportation of refrigerant, so fewer bends increases performance. • The equivalent length of each bend is 1.64 feet. • The equivalent length of each Y-Joint or header is 1.64 feet. •...
  • Page 10 Case 5 A210233 • Bends in piping cause pressure loss during transportation of refrigerant, so fewer bends increase performance. • The equivalent length of each bend is 1.64 feet. • The equivalent length of each Y-Joint or header is 1.64 feet. •...
  • Page 11 Select adapter pipes based on downstream indoor capacity. Use the proper tool to cut off unnecessary parts when connecting field pipes. Table 19 —Adapter Pipe Selection Model Name Gas Side Liquid Side Heat Insulation Material 40VM900031 A210235 A210236 A210234 40VM900032 A210238 A210237 A210236...

  • Page 12: Refrigerant Charge Calculation

    Refrigerant Charge Calculation Based on the field installed refrigerant pipe and system layout, additional refrigerant charge may be required. Add additional refrigerant based on the calculation below. A210240 Fig. 19 —Calculating Refrigerant Charge R*: Amount of additional refrigerant to be charged Regardless of the total amount calculated by the formula above, the maximum additional refrigerant charge must not exceed 22.0 lbs for the system.

  • Page 13: Refrigerant Circuit

    REFRIGERANT CIRCUIT A210241 Fig. 20 —Functional Parts Layout Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

  • Page 14: Refrigerant Circuit

    Refrigerant Circuit Table 20 —Refrigerant Circuit Description Name Symbol Major Function Inverter compressor Used to vary the refrigerant flow rate by adjusting the frequency based on capacity requirement Oil separator Used to separate oil from high pressure gas refrigerant, which is pumped out from the compressor 4-way valve Switches the operation mode between heating and cooling Heat exchanger...

  • Page 15: Refrigerant Flow For Each Operation Mode

    Refrigerant Flow for Each Operation Mode A210243 Fig. 22 —Cooling Operation Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 16 A210244 Fig. 23 —Heating Operation Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 17 A210245 Fig. 24 —Oil Return and Defrost Operation Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

  • Page 18: Field Wiring

    FIELD WIRING Remove the L-shape metal plate for power supply and control wiring. A210246 Table 21 —Thickness of Wire for Main Power Supply Recommended Setting Outdoor Unit Model Minimum Wire Thickness AWG Breaker for Wiring(A) Breaker for Current Leakage Main Wire Ground 38VMB036HDS3-1 40A 100mA 0.1second.

  • Page 19: Typical Power Supply Wiring

    Typical Power Supply Wiring A210247 Fig. 25 —Outdoor Unit Power Supply Wiring A210248 Fig. 26 —Indoor Unit Power Supply Wiring Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

  • Page 20: Typical Control Wiring

    Typical Control Wiring Use 2-core stranded shielded wires for communication bus. Maximum Length to Outdoor Unit L1 + L3, L5 ≤ 3937 feet AWG 18 Maximum Length from Controller to Indoor Units L6 + L7 + L8 + L9, L10 + L11 ≤...
  • Page 21 SW1 button on PCB is for force cooling mode. Press once to enter the force cooling mode, and press twice to exit the operation. SW2 button is the query button. The LED will display the parameter values by the number of pushes per SW2 query instructions.
  • Page 22 <<start here>> Table 23 —Dip Switch Setting Dip Switch Function Definition Heating priority mode (factory setting) A210250 Cooling priority mode A210251 Indoor unit priority mode (IDU #63) or majority mode A210252 Heating mode only A210253 Cooling mode only A210254 Automatic addressing A210255 Manual addressing (factory setting) A210256...

  • Page 23: Function And Control

    FUNCTION AND CONTROL A210262 Fig. 28 —Operation Mode Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

  • Page 24: Basic Control

    Basic Control NORMAL OPERATION Table 24 —Cooling Operation COMPONENT NORMAL OPERATION REMARK Compressor (INV) Capacity demand control To build pressure difference Outdoor Unit fan (FAN) Cooling fan control 4-Way Valve Electronic Expansion Valve (EEV) Discharge temperature control Adjust refrigerant flow rate to protect compressor Fast Oil Return Valve (SV4) 17 minutes OFF then 3 minutes ON Hot Gas Bypass Valve (SV5)
  • Page 25 ELECTRONIC EXPANSION VALVE (EEV) The opening of the EEV is based on compressor discharge temperature (T5). If T5 increases, EEV operates the opening to target value directly. Otherwise, it regulates itself to step-by-step operation. A210263 A210264 Fig. 29 —Cooling Operation Fig.
  • Page 26 OUTDOOR FAN CONTROL There are eight step levels (W1 to W8); however, OFF = 0 rpm is not displayed as a step level. Table 26 —Eight Steps of Outdoor Fan Control Down Fan Control in Cooling Mode Table 27 —Fan Control by Outdoor Temperature (T4) and Compressor Frequency Frequency <...
  • Page 27 Fan Control in Heating Mode Table 28 —Fan Control by Outdoor Temperature (T4) and Compressor Frequency 38VMB036, 048HDS3-1 Frequency < 34 34 ≤ Frequency < 50 Frequency ≥ 50 T4 ≥ 50°F 41°F ≤ T4 < 50°F Max. speed 33.8°F ≤ T4 < 41°F T4 <...

  • Page 28: Special Control

    Special Control Table 29 —Startup Control Component Cooling Operation Heating Operation Remark Compressor Capacity demand control Capacity demand control Sequence A to C W7 for twenty seconds, then control based Maximum speed referred to T4 and Outdoor unit fan on frequency, T4, T5, and Tc frequency 4-Way Valve (ST1) 300 pls for three minutes when T4 ≥...

  • Page 29: Oil Return Operation

    Oil Return Operation When cumulative compressor operating time exceeds eight hours, the outdoor unit starts oil return operation. Table 30 —Oil Return in Cooling Mode Component Before Oil Return Operation Oil Return After Oil Return Operation Target frequency for oil return (58Hz Compressor Normal control for 38VMB036HDS3-1,66Hz for...

  • Page 30: Defrost Control

    Defrost Control The outdoor unit activates defrosting operation by T3 and accumulative heating time after the latest defrosting. Table 32 —Defrosting Operation Component Before Defrosting Operation Defrosting Operation After Defrosting Operation 30 Hz for 30 seconds → Target Current value frequency for defrosting operation →30 Hz for 55 seconds, then adjusts to Compressor...

  • Page 31: Protection Control

    Protection Control PRESSURE PROTECTION CONTROL These controls are used to protect the unit due to abnormal increase of high pressure or decrease of low pressure. HPS opens at 638 psi, and closes when high pressure is lower than 464 psi. LPS opens at 20 psi, and closes when detected low pressure is larger than 43 psi.

  • Page 32: Troubleshooting

    TROUBLESHOOTING Service Diagnosis If one of the following errors have occurred, contact local distributor for assistance. • The error lamp of the outdoor unit flashing rapidly even though shut down and restart of the system is carried out. • The remote controller displays error codes or the buttons on the controller do not work. •...

  • Page 33: Electrical Components And Wiring Diagrams

    Electrical Components and Wiring Diagrams OUTDOOR UNIT CIRCUIT BOARD ARRANGEMENT A210274 Fig. 39 —Integral Arrangement A210275 Fig. 40 —Inner Arrangement Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 34 CIRCUIT BOARD INSTRUCTIONS A210276 Fig. 41 —Main Board * Power output in this board is to provide power supply for power drive board. Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 35 A210277 Fig. 42 —Power Drive Board Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

  • Page 36: Troubleshooting From Outdoor Unit

    Troubleshooting from Outdoor Unit CAUTION Be sure to turn off power switch before connecting or disconnecting the connector. Failure to do so could damage the board. Table 35 —Error Code of Outdoor Unit Error Code Definition Communication error between indoor units and outdoor unit Temperature sensor (T3 or T4) error Power voltage protection DC fan error...
  • Page 37 E2: COMMUNICATION ERROR BETWEEN INDOOR UNITS AND OUTDOOR UNIT DEFINITION Outdoor unit cannot communicate with indoor units. POSSIBLE CAUSES • Communication wires between ODU and IDUs are installed incorrectly. • Communication wires between communication and main control board are installed incorrectly. •...
  • Page 38 E4: TEMPERATURE SENSOR (T3 OR T4) ERROR DEFINITION The temperature sensor (T3 or T4) on main board is short or damaged. (i.e. The test voltage > 4.95V or < 0.05V) POSSIBLE CAUSES • The temperature sensor is located at wrong place •...
  • Page 39 E5: POWER VOLTAGE PROTECTION DEFINITION The voltage of ODU is not within the acceptable range. POSSIBLE CAUSES • Improper voltage • Loose wiring between power terminals and main control board • Damaged main board of ODU A210280 Fig. 45 —E5 Troubleshooting Chart Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 40 E6 OR EB: DC FAN ERROR DEFINITION • Fan rotation is less than 240 RPM for 20 seconds during operation. • Fan rotation difference between the transient RPM and target one is larger than set value for three minutes. • Eb will be reported on DIS1 if E6 occurs two times within ten minutes. POSSIBLE CAUSES •...
  • Page 41 E7: DISCHARGE TEMPERATURE SENSOR (T5) ERROR DEFINITION • The temperature sensor (T5) is short or damaged. • Test voltage > 4.95V or < 0.05V. POSSIBLE CAUSES • The temperature sensor is installed in the wrong place • Loose connection at post on main control board •...
  • Page 42 E9 OR E.9.: EEPROM ERROR DEFINITION • E9: EEPROM damage • E.9.: Unmatched data for EEPROM POSSIBLE CAUSES • Chip or main board damaged • Wrong software in EEPROM • Wrong EEPROM mode A210283 Fig. 48 —E9 or E.9 Troubleshooting Chart EA: DC FANS STAY AT ZONE A FOR MORE THAN FIVE MINUTES IN HEATING MODE DEFINITION Low pressure is too high even though the fan step minimum is T3 >...
  • Page 43 P1: HIGH PRESSURE PROTECTION DEFINITION High pressure switch is activated for pressure > 638 psi. POSSIBLE CAUSES • Stop valve is closed • The heat exchanger is dirty or blocked • Excess refrigerant in the system • Damaged main board •...
  • Page 44 P2: LOW PRESSURE PROTECTION DEFINITION Low pressure switch is activated for pressure ≤ 20psi POSSIBLE CAUSES • Stop valve is closed • The heat exchanger is dirty or blocked • Insufficient refrigerant in the system • Damaged main board • Low pressure resulted by refrigerant blocked on high pressure zone due to the damaged valve of IDU or ODU A210286 Fig.
  • Page 45 P3: INPUT CURRENT OVERLOAD PROTECTION DEFINITION Input current overload protection is activated when current is drawn above the allowable limit. POSSIBLE CAUSES • Stop valve is closed • Improper power supply • Excess refrigerant in the system • Damaged valve or filter resulting in large pressure ratio •...
  • Page 46 P4: DISCHARGE TEMPERATURE PROTECTION DEFINITION • Discharge temperature protection is activated when discharge temperature is higher than 230°F. • System will restart once the discharge temperature (T5) is below 190°F. POSSIBLE CAUSES • Stop valve is closed • Improper power supply •...
  • Page 47 P5: CONDENSER TEMPERATURE PROTECTION DEFINITION • Condenser temperature protection is activated when condenser temperature is higher than 144°F. • System will restart once the condensing temperature (T3) is below 126°F. POSSIBLE CAUSES • Stop valve is closed • Improper airflow •...
  • Page 48 P8: FAN SPEED EXCEEDS TARGET FAN MOTOR ROTATION FOR FIVE SECONDS OR MORE DEFINITION • When fan speed exceeds minimum target fan motor rotation (500 RPM) for five seconds or more, protection is activated. • System will restart once the fan speed is < 400 RPM. POSSIBLE CAUSES Fan speed exceeds the target fan motor rotation due to excessive wind.
  • Page 49 PP: LIQUID SLUGGING PROTECTION DEFINITION The discharge superheat of compressor is less than 5.4°F for 50 minutes. POSSIBLE CAUSES • Defective discharge temperature sensor • Damaged main board • Excess refrigerant charge • Improper valve function of IDU or ODU •...
  • Page 50 A210292 Fig. 57 —PP Troubleshooting Chart Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 51 F1: DC BUS VOLTAGE TOO LOW DEFINITION If DC bus voltage of compressor module P and N is less than 200 VDC for five seconds, relay on the main board is inoperable. POSSIBLE CAUSES • Abnormal power supply to power drive board •...
  • Page 52 H0: COMMUNICATION ERROR BETWEEN POWER DRIVE AND MAIN CONTROL BOARD DEFINITION Communication error between power drive and main control board. POSSIBLE CAUSES • Communication wire between power drive board and main board is loose • Damaged power drive board • Damaged main board A210296 Fig.
  • Page 53 L0~L9 OR H4: COMPRESSOR MODULE PROTECTION DEFINITION Error Detailed Definition Number of Flashing Times for Green LED Red LED L0: Error in compressor module L1: DC bus under-voltage protection L2: DC bus over-voltage protection Compressor module protection Light on constantly L4: Compressor MCE error L8: Compressor speed difference between set and run is more than 15 rps...
  • Page 54 L0: ERROR IN COMPRESSOR MODULE A210299 Fig. 61 —L0 Troubleshooting Chart Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 55 L1: DC BUS UNDER-VOLTAGE PROTECTION A210300 Fig. 62 —L1 Troubleshooting Chart *1 L1 error will be reported when it is lower than 220 VDC. Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 56 L2: DC BUS OVER-VOLTAGE PROTECTION A210301 Fig. 63 —L2 Troubleshooting Chart *2 L2 fault will be reported when it is higher than 500 VDC. Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 57 L4: COMPRESSOR MCE ERROR A210302 Fig. 64 —L4 Troubleshooting Chart Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 58 L8: COMPRESSOR SPEED DIFFERENCE BETWEEN SET AND RUN IS MORE THAN 15 RPS L9: COMPRESSOR SPEED DIFFERENCE IS MORE THAN 15 RPS IN ONE SECOND A210303 Fig. 65 —L8 and L9 Troubleshooting Chart Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

  • Page 59: Appendix

    APPENDIX Resistance of Temperature Sensor (A)* Table 36 —Temperature Sensor Resistance Temp. Resistance Voltage Temp. Resistance Voltage Temp. Resistance Voltage (°F) (KΩ) (°F) (KΩ) (°F) (KΩ) -38.2 387.13 0.10 51.8 19.62 1.46 141.8 2.27 3.90 -36.4 360.98 0.11 53.6 18.66 1.51 143.6 2.19...
  • Page 60 Resistance of Temperature Sensor (B)** Table 37 —Temperature Sensor Resistance Temp. Resistance Voltage Temp. Resistance Voltage Temp. Resistance Voltage (°F) (KΩ) (°F) (KΩ) (°F) (KΩ) -4.0 542.70 0.0732 89.6 40.57 0.83 183.2 6.03 2.86 -2.2 511.90 0.0775 91.4 38.89 0.86 185.0 5.84 2.90...
  • Page 61 Electrical Wiring Diagrams A210304 Fig. 66 —Wiring Diagram Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

  • Page 62: Bill Of Material (Bom)

    BILL OF MATERIAL (BOM) A210305 Fig. 67 —VRF Outdoor Unit Internal Components Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 63 A210306 Fig. 68 —VRF Outdoor Unit Internal Components A210307 Fig. 69 —3-Ton Exploded View Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 64 A210308 Fig. 70 —4-Ton Exploded View A210309 Fig. 71 —5-Ton Exploded View Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 65 Table 38 —VRF Outdoor Unit Parts Breakdown CARRIER NAME PART NAME QUANTITY BOM CODE CONTROL BOX ASSEMBLY E-part box assembly 17227000001779 BOARD, MAIN CONTROL Outdoor main control board assembly 17127000005516 TRANSFORMER Transformer 11203103000225 1.11 BOX, CONTROL Supporter of electric parts...
  • Page 66 Form No: 38VMH-1P-3SM © 2021 Carrier. All rights reserved. Edition Date: 07/21 A Carrier Company Printed in USA Replaces: 38VMH-1P-2SM Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

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