Table of Contents
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37MURA
Residential Single Zone Heat Pump System
Sizes 18 to 60
Fig. 1 -Sizes 18K to 60K
NOTES: Read the entire instruction manual before starting the
installation.
Images are for illustration purposes only. Actual models may differ
slightly.
Installation Instruction
Specifications subject to change without notice.
TABLE OF CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
REFRIGERANT PIPING CONNECTION . . . . . . . . . . . . . . . . . . . 15
REFRIGERANT PIPING CONNECTION INSTRUCTIONS . . . . 16
OUTDOOR UNIT INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . 18
WIRING PRECAUTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
OUTDOOR UNIT WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
SPECIFIC WIRING METHODS . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
CROSSOVER WIRING DIAGRAMS. . . . . . . . . . . . . . . . . . . . . . . 25
WIRING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
OUTDOOR UNIT DIP SWITCH SETTING. . . . . . . . . . . . . . . . . . 36
THERMOSTAT WIRING METHODS . . . . . . . . . . . . . . . . . . . . . . 37
SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
EVACUATE COIL AND TUBING SYSTEM . . . . . . . . . . . . . . . . 41
ADDING REFRIGERANT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
TEST RUN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
CROSSOVER START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . 44
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Summary of Contents for Carrier 37MURA
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Page 1: Table Of Contents
37MURA Residential Single Zone Heat Pump System Sizes 18 to 60 Installation Instruction TABLE OF CONTENTS PAGE SAFETY CONSIDERATIONS ......2 ACCESSORIES . -
Page 2: Safety Considerations
37MURA: Installation Instructions SAFETY CONSIDERATIONS CAUTION Installing, starting up, and servicing air-conditioning equipment can be hazardous due to system pressures, electrical components, and equipment location (roofs, elevated structures, etc.). EQUIPMENT DAMAGE HAZARD Only trained, qualified installers and service mechanics should install, Failure to follow this caution may result in equipment damage or start-up, and service this equipment. - Page 3 37MURA: Installation Instructions WARNING WARNING Turn of the unit and disconnect the power before performing any FOR FLAMMABLE REFRIGERANTS installation or repairing. Failure to do so can cause electric shock. Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manufacturer.
- Page 4 37MURA: Installation Instructions Table 2 — A (min) Ho, release height ft (m) Mc or Mrel ≤ 7.2 (2.2) 7.5 (2.3) 7.9 (2.4) 8.5 (2.6) 9.2 (2.8) 9.8 (3.0) lbs ( kgs) ≤ 3.91 (1.776) 12 (1.10) 4.0 (1.8) 60 (5.53) 57 (5.29)
- Page 5 37MURA: Installation Instructions 1. Installation (where refrigerant pipes are allowed) • after completion of field piping for split systems, the field pipework • Any person who is involved with working on or breaking into a shall be pressure tested with an inert gas and then vacuum tested prior...
- Page 6 37MURA: Installation Instructions 8. Presence of fire extinguisher 14. Detection of flammable refrigerants If any hot work is to be conducted on the refrigeration equipment or any Under no circumstances shall potential sources of ignition be used in the associated parts, appropriate fire extinguishing equipment shall be searching for or detection of refrigerant leaks.
- Page 7 37MURA: Installation Instructions Ensure that contamination of different refrigerants does not occur associated shut-off valves in good working order. Empty recovery when using charging equipment. Hoses or lines shall be as short as cylinders are evacuated and, if possible, cooled before recovery occurs.
- Page 8 37MURA: Installation Instructions • for LIMITED LIFE REFRIGERANT SENSORS Used Table 3 — Symbols displayed on the indoor unit or outdoor unit REFRIGERANT DETECTION SYSTEMS, the specified end-of-life and replacement instructions; This symbol shows that this appliance • REFRIGERANT SENSORS for REFRIGERANT DETECTION used a flammable refrigerant.
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Page 9: Accessories
37MURA: Installation Instructions ACCESSORIES The system is shipped with the following accessories. Use all of the installation parts and accessories to install the system. Improper installation may result in water leakage, electrical shock and fire, or cause the equipment to fail. Keep the installation manual in a safe place and do not discard any other accessories until the installation work has been completed. -
Page 10: Dimensions
37MURA: Installation Instructions DIMENSIONS Table 5 — Dimensions and Weights System Size (208/230 V) (208/230 V) (208/230 V) (208/230 V) (208/230 V) (208/230 V) Height (H) in (mm) 21.81 (554) 26.50 (673) 31.89 (810) 31.89 (810) 38.39 (975) 38.39 (975) - Page 11 37MURA: Installation Instructions DIMENSIONS (CONT.) Fig. 4 —Sizes 24K Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
- Page 12 37MURA: Installation Instructions DIMENSIONS (CONT.) Fig. 5 —30K/36K Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
- Page 13 37MURA: Installation Instructions DIMENSIONS (CONT.) Fig. 6 —Sizes 48K/60K Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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Page 14: Front View
37MURA: Installation Instructions DIMENSIONS (CONT.) The outdoor unit can be anchored to the ground or to a wall-mounted bracket with bolt (M10). Prepare the installation base of the unit according to the dimensions below. For installation of multiple units, see Fig 15. -
Page 15: Refrigerant Piping Connection
37MURA: Installation Instructions REFRIGERANT PIPING CONNECTION SAFETY PRECAUTIONS WARNING All field piping must be completed by a licensed technician and must comply with the local and national regulations. When the air conditioner is installed in a small room, measures must be taken to prevent the refrigerant concentration in the room from exceeding the safety limit in the event of refrigerant leakage. -
Page 16: Refrigerant Piping Connection Instructions
37MURA: Installation Instructions REFRIGERANT PIPING CONNECTION Step 3: Flare Pipe Ends Proper flaring is essential to achieving an airtight seal. INSTRUCTIONS a. After removing the burrs from the cut pipe, seal the ends with PVC tape to prevent foreign materials from entering the pipe. -
Page 17: Minimum Bend Radius
37MURA: Installation Instructions Step 4: Connect the Pipes MINIMUM BEND RADIUS Connect the copper pipes to the indoor unit first, then connect the 1. Carefully bend the tubing in the middle according to Fig. 13. pipes to the outdoor unit. Connect the low-pressure pipe first, then connect the high pressure pipe. -
Page 18: Outdoor Unit Installation
37MURA: Installation Instructions OUTDOOR UNIT INSTALLATION CAUTION Prior to Installation Before installing the indoor unit, ensure the compatibility with the outdoor unit using the product data as a reference. It is also necessary to confirm the proper application of the equipment and to perform a heat load calculation for proper sizing. - Page 19 37MURA: Installation Instructions CLEARANCE Fig. 15 —Installation of Multiple Units Table 11 — Rows of Series Installation L < 1/2H 9-7/8in (250mm) or more L < H 1/2H < L < H 11-7/8in(300mm) or more L > H Cannot be installed DO NOT INSTALL UNIT IN THE FOLLOWING LOCATIONS •...
- Page 20 37MURA: Installation Instructions INSTALL DRAIN JOINT (HEAT PUMP UNIT ONLY) Before bolting the outdoor unit in place, you must install the drain joint at the bottom of the unit. NOTE: There are two different types of drain joints depending on the type of outdoor unit.
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Page 21: Wiring Precautions
37MURA: Installation Instructions WIRING PRECAUTIONS DO THE FOLLOWING to install the unit on the ground or on a concrete mounting platform. WARNING 1. Mark the positions for four expansion bolts based on dimensions chart. 2. Pre-drill holes for expansion bolts. -
Page 22: Outdoor Unit Wiring
37MURA: Installation Instructions OUTDOOR UNIT WIRING WARNING Turn off the power to the main system before performing any electrical work. Step 1: Prepare the cable for connection. 1. Choose the right cable size. 2. Using wire strippers, strip the jacket from both ends of the signal cable to reveal approximately 5.9in (150mm) of wire. -
Page 23: Specific Wiring Methods
37MURA: Installation Instructions Terminal block Connecting cable Power supply cord Conduit panel Wire Cover Select the appropriate through-hole according to the diameter of the wire. Fig. 20 —Outdoor Unit Wiring WARNING Isolate the power supply leads and communication leads by the strain relief and keep the power supply leads away from the communication leads. - Page 24 NOTE: This equipment energizes the reversing valve in heat. Ensure that the B terminal is configured at the thermostat for heat. NOTE: This method can be used for a 37MURA outdoor unit and a third party indoor unit or cased coil and gas furnace.
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Page 25: Crossover Wiring Diagrams
37MURA: Installation Instructions CROSSOVER WIRING DIAGRAMS Fig. 25 —Single-Stage Furnace with Variable Speed Heat Pump (with Single Speed Airflow) APPLIES TO: • 59SU5B / 58SC(0,1)B / 58SB(0,1)B / 59SC2E / 59SC6A /59SP6B / 58SP0B / 59CU5B / 58CU0B • 935SB / 830CB / 926SB / 81(0,1)SB / 8(0,1)SB / 912SE / 916SA / 935CB / 820SB •... - Page 26 37MURA: Installation Instructions CROSSOVER WIRING DIAGRAMS (CONT.) Fig. 26 —Single-Stage and Two-Stage Furnace with Variable Speed Heat Pump APPLIES TO: • 58SU0B / 59TN6C / 58TN0B / 59TP6C / 58TP0B • 986TD / 880TB / 926TC / 820TP / 830SB •...
- Page 27 37MURA: Installation Instructions CROSSOVER WIRING DIAGRAMS (CONT.) Fig. 27 —Single-Speed Fancoil with Variable Speed Heat Pump (1S Heat) 1 APPLIES TO: FMA5X / FMA5L NOTES: • ‘O/B’ energized on heating. • Refer to indoor unit literature for additional information. NOTE: Reference https://www.cbpeqp.com/Carrierratings.aspx...
- Page 28 37MURA: Installation Instructions CROSSOVER WIRING DIAGRAMS (CONT.) Fig. 28 —Single-Speed Fancoil with Variable Speed Heat Pump (MS Heat) APPLIES TO: FJ5 NOTES: • ‘O/B’ energized on heating. • Refer to indoor unit literature for additional information. NOTE: Reference https://www.cbpeqp.com/Carrierratings.aspx for compatible indoor units.
- Page 29 37MURA: Installation Instructions CROSSOVER WIRING DIAGRAMS (CONT.) Fig. 29 —Single-Speed Fancoil with Variable Speed Heat Pump (1S Heat) 2 APPLIES TO: FM(U,C)5(Z,X) NOTES: • ‘O/B’ energized on heating. • Refer to indoor unit literature for additional information. NOTE: Reference https://www.cbpeqp.com/Carrierratings.aspx for compatible indoor units.
- Page 30 37MURA: Installation Instructions CROSSOVER WIRING DIAGRAMS (CONT.) Fig. 30 —Two-Speed Fancoil with Variable Speed Heat Pump (1S Coil) APPLIES TO: FT5 / FG5 / F55 NOTES: • ‘O/B’ energized on heating. • Refer to indoor unit literature for additional information.
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Page 31: Wiring Diagrams
37MURA: Installation Instructions WIRING DIAGRAMS Fig. 31 — Size 18K Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. - Page 32 37MURA: Installation Instructions Fig. 32 — Size 24K Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
- Page 33 37MURA: Installation Instructions DC FAN MOTOR CN32 CN26 CN 38 CN 24 CN12 CN11 CN 37 CN 12 CN 14 CN 15 CN 17 (1)L1(2)L2 B W D Y1 Y2 L B W D CN5 B W D R C Y1 Y2 L R C Y1 Y2 L Fig.
- Page 34 37MURA: Installation Instructions DC FAN MOTOR CN 32 CN 26 CN3 0 CN3 8 CN2 4 CN 12 CN11 CN3 7 CN 19 CN2 1 CN1 2 CN1 7 CN1 5 CN 9 CN 4 CN1 4 CN 6 CN 3...
- Page 35 37MURA: Installation Instructions DC FAN MOTOR CN 32 CN 26 CN3 0 CN44 CN3 8 CN2 4 CN 12 CN11 CN 19 CN2 1 CN3 7 CN1 2 CN1 7 CN1 5 CN 9 CN1 4 CN 4 CN 6...
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Page 36: Outdoor Unit Dip Switch Setting
37MURA: Installation Instructions OUTDOOR UNIT DIP SWITCH SETTING Press the SW4 button 10S for force defrosting (the SW3 button is not active). Note that forced defrost should only be used to test defrost. All defrost termination conditions will affect the length of time that forced defrost is active. -
Page 37: Thermostat Wiring Methods
37MURA: Installation Instructions THERMOSTAT WIRING METHODS Any 24 volt connections to the outdoor should only be NOTE: The following wiring diagram are suitable for the AHU and ODU with 24V thermostat. reserved for Scenario 3 wiring. Scenario's 1 and 2 should use the S1 and S2 terminals at the outdoor unit. failure to observe this could result in damage to system components. - Page 38 37MURA: Installation Instructions COM OY2 OY1 Y/Y2 OB/O S4-2 Default on, DH function off. Turn switch off to activate DH function. Fig. 39 —Wiring for 3H and 2C thermostat COM OY2 OB/O Y/Y2 Fig. 40 —Wiring for 2H and 2C thermostat...
- Page 39 37MURA: Installation Instructions THERMOSTAT WIRING METHODS (CONT.) Y/Y2 COM OY2 OB/O S4-2 Default on, DH function off. S4-4 Default on, W1 and W2 Turn switch off to activate DH shorted for single stage Aux heat function. operation. Turn off to separate stages.
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Page 40: Control Logic
37MURA: Installation Instructions COM OY2 OB/O Y/Y2 Fig. 43 —Wiring for 1H and 1C thermostat Y/Y2 COM OY2 OB/O Fig. 44 — Wiring for 1H and 1C thermostat Control Logic LED Display Table 12 — Indoor Unit Connector The control displays unit status as well as any active fault codes on the LED display. -
Page 41: Specifications
37MURA: Installation Instructions SPECIFICATIONS Table 13 — Cooling and Heating Power Specifications MODEL (Btu/h) Phase 1 Phase Power (Outdoor) Frequency and Voltage 208/230, 60Hz 22.5A Outdoor Unit Line Quantity Outdoor-Indoor Signal Line Line Diameter (AWG) Line Quantity Thermostat Signal Line... -
Page 42: Adding Refrigerant
37MURA: Installation Instructions TEST RUN TRIPLE EVACUATION METHOD The triple evacuation method should be used when vacuum pump is not capable of pumping down to 1/4 inch and system does not contain any CAUTION liquid water. Refer to Fig. 48 and proceed as follows: 1. -
Page 43: Troubleshooting
37MURA: Installation Instructions TROUBLESHOOTING For ease of service, the systems are equipped with diagnostic code display LEDs on both the indoor and outdoor units. The outdoor diagnostic display consists of two LEDs (Red and Green) on the outdoor unit board and is limited to a few errors. -
Page 44: Crossover Start-Up Checklist
37MURA: Installation Instructions CROSSOVER START-UP CHECKLIST Installation Data Site Address:_______________________________________________________________________________________________________ City:________________________________________________________ State:___________ Zip Code:__________________ Installing Contractor:______________________________________________________ Contractor Contact #: ( ) _____-___________ Job Name:_______________________________________________________________ Start-up Date:_____________________________ Distributor:_______________________________________________________________ System Details Units Model No. Serial No. Controller OUTDOOR UNIT INDOOR UNIT A... -
Page 45: Performance Check
37MURA: Installation Instructions Crossover Start-Up Checklist (CONT) Piping Leak Check: System held 500 psig (max. 550psi) for a minimum of 30 minutes using dry nitrogen. YES:______ NO:______ Evacuation Method: • YES:______ NO:______ Was the Triple Evacuation Method used as outlined in the installation manual? •... - Page 46 37MURA: Installation Instructions Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
- Page 47 37MURA: Installation Instructions Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
- Page 48 37MURA: Installation Instructions © 2024 Carrier. All rights reserved. Edition Date: 10/24 Catalog No: 37MURA-01SI Replaces: New Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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