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37MBRAQ
Outdoor Unit Single Zone Ductless System
Sizes 36K, 48K, and 58K
Fig. 1 -Sizes 36K
Fig. 2 -Sizes 48K - 58K
NOTES: Read the entire instruction manual before
starting the installation.
Images are for illustration purposes only. Actual
models may differ slightly.
Installation Instructions
Specifications subject to change without notice.
TABLE OF CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
CLEARANCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
INSTALLATION INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . 13
REFRIGERANT CONNECTION INSTRUCTIONS . . . . . . . . . . . 18
WIRING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
CONNECTION DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
OUTDOOR UNIT WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
ELECTRICAL CONNECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . 23
WIRING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
ELECTRICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
WIRING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
AIR EVACUATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
TEST RUN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
CARE AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
DUCTLESS START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . 32
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Summary of Contents for Carrier 37MBRAQ
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Page 1: Table Of Contents
37MBRAQ Outdoor Unit Single Zone Ductless System Sizes 36K, 48K, and 58K Installation Instructions TABLE OF CONTENTS Page SAFETY CONSIDERATIONS ......2 INTRODUCTION . -
Page 2: Safety Considerations
37MBRAQ: 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 37MBRAQ: 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.
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Page 4: Prior To Installation
37MBRAQ: Installation Instructions Table 1 — 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 (kg) ≤ 3.91 (1.776) 12 (1.10) 4.0 (1.8) 60 (5.53) 57 (5.29) - Page 5 37MBRAQ: Installation Instructions 1. Installation (where refrigerant pipes are allowed) –-after completion of field piping for split systems, the field Any person who is involved with working on or breaking into a pipework shall be pressure tested with an inert gas and then...
- Page 6 37MBRAQ: Installation Instructions 9. No ignition sources 14. Detection of flammable refrigerants No person carrying out work in relation to a REFRIGERATING Under no circumstances shall potential sources of ignition be used in SYSTEM which involves exposing any pipe work shall use any the searching for or detection of refrigerant leaks.
- Page 7 37MBRAQ: Installation Instructions For appliances containing flammable refrigerants, refrigerants k. Recovered refrigerant shall not be charged into another purging shall be achieved by breaking the vacuum in the system refrigeration system unless it has been cleaned and checked. with oxygen-free nitrogen and continuing to fill until the working 18.
- Page 8 37MBRAQ: Installation Instructions The manufacturer should specify other potential continuously The effectiveness of signs should not be diminished by too many operating sources known to cause ignition of the refrigerant used. signs being placed together. The appliance shall be stored so as to prevent mechanical damage Any pictograms used should be as simple as possible and contain from occurring.
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Page 9: Introduction
37MBRAQ: Installation Instructions INTRODUCTION The Horizontal Discharge Outdoor units are R-454b condensing units designed with application flexibility in mind. These units have a max total piping length up to 246ft (75m) and a maximum piping lift of up to 98 ft (30m). -
Page 10: Dimensions
37MBRAQ: Installation Instructions DIMENSIONS Table 4 — Dimensions and Weights System Size (208/230 V) (208/230 V) (208/230 V) Height (H) in (mm) 31.89 (810) 52.48 (1333) 52.48 (1333) Width (W) in (mm) 37.24 (946) 37.48 (952) 37.48(952) Depth (D) in (mm) 16.14 (410) - Page 11 37MBRAQ: Installation Instructions DIMENSIONS (CONT.) Fig. 5 —Sizes 48K - 58K Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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Page 12: Clearances
37MBRAQ: Installation Instructions CLEARANCES Air inlet Air outlet Fig. 6 — Outdoor Unit Clearances Table 5 — Outdoor Unit Clearance Dimensions MINIMUM VALUE UNIT in. (mm) 20 (500) 14 (350) 20 (500) 4 (100) 4 (100) Table 6 — Rows of Series Installation The relationship between H, A, and L are as follows L <... -
Page 13: Installation Instructions
37MBRAQ: Installation Instructions INSTALLATION INSTRUCTIONS IMPORTANT: Both refrigerant lines must be insulated separately. Use refrigerant grade tubing ONLY. No other type • A location which is convenient to installation and not exposed to strong tubing may be used. Use of other types of tubing will void the winds. -
Page 14: Installation Summary
37MBRAQ: Installation Instructions INSTALLATION SUMMARY D. AIR EVACUATION A. INSTALLATION INSTRUCTIONS (Set Installation Location, Install Drain Joint, Anchor Outdoor Unit). Fig. 11 —Evacuate the Refrigeration System E. TEST RUN Fig. 8 —Install the Outdoor Unit B. REFRIGERANT CONNECTION INSTRUCTIONS (Cut pipes, Remove burrs, etc.). -
Page 15: Install Drain Joint
37MBRAQ: Installation Instructions 22.Install drain joint Step 1: Find out the base pan hole of outdoor unit. Base pan hole of outdoor unit Fig. 13 —Find Base Pan Hole Step 2: • Fit the rubber seal on the end of the drain joint that will connect to the outdoor unit. -
Page 16: Anchor Outdoor Unit
37MBRAQ: Installation Instructions 23.Anchor Outdoor Unit WARNING When drilling into concrete, eye protection is recommended at all times. • 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. - Page 17 37MBRAQ: Installation Instructions Table 9 — Relationship Between H, A, and L. L ≤ 1/2H 9.8in (25 cm) or more L ≤ H 1/2H < L ≤ H 11.8in (30 cm) or more L > H Cannot be installed NOTE...
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Page 18: Refrigerant Connection Instructions
37MBRAQ: Installation Instructions REFRIGERANT CONNECTION 5. Flare Pipe Ends Proper flaring is essential to achieve an airtight seal. INSTRUCTIONS a. After removing burrs from cut pipe, seal the ends with PVC tape to prevent foreign materials from entering the pipe. - Page 19 37MBRAQ: Installation Instructions h. Remove the flaring tool and flare form, then inspect the end of the pipe for cracks and even flaring. CAUTION 6. Connect Pipes Connect the copper pipes to the indoor unit first, then connect it to the outdoor unit.
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Page 20: Refrigerant Piping
37MBRAQ: Installation Instructions REFRIGERANT PIPING WARNING Table 12 — Piping and Refrigerant Information 37MBRAQ 37MBRAQ 37MBRAQ OUTDOOR MODEL 36AA3 48AA3 58AA3 All field piping must be completed by a licensed technician and must comply with the local and national regulations. -
Page 21: Wiring Instructions
37MBRAQ: Installation Instructions WIRING INSTRUCTIONS • Only connect the unit to an individual branch circuit. Do not connect another appliance to that outlet. WIRING PRECAUTIONS • Make sure to properly ground the unit. • Every wire must be firmly connected. Loose wiring can cause the... - Page 22 37MBRAQ: Installation Instructions CONNECTION DIAGRAMS (CONT.) Fig. 26 —Grounding Wire Image - Size 48K-58K Fig. 27 —Connection Diagram (Sizes 36K-58K) NOTES: 1. Do not use the thermostat wire for any connection between indoor and outdoor units. 2. All connections between indoor and outdoor units must be as shown in Figure and 26. The connections are sensitive to polarity and will result in a fault code.
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Page 23: Outdoor Unit Wiring
37MBRAQ: Installation Instructions OUTDOOR UNIT WIRING ELECTRICAL CONNECTIONS Install All Power and Interconnecting Wiring to WARNING Outdoor Units 1. Mount the outdoor power disconnect. 2. Run the power wiring from the main box to disconnect per NEC and Before performing any electrical or wiring work, turn off the main local codes. -
Page 24: Wiring Instructions
37MBRAQ: Installation Instructions WIRING INSTRUCTIONS WARNING The main power is supplied to the outdoor unit as shown in Table All wires must be sized per NEC (National Electrical Code) or CEC (Canadian Electrical Code) and local codes. Use Electrical Data table MCA... -
Page 25: Electrical Data
37MBRAQ: Installation Instructions ELECTRICAL DATA Table 14 — Electrical Data Outdoor Unit Size Power (Voltage-Phase-Frequency V-P-H 208/230-1-60 MCA (Minimum Circuit Ampacity) MOPA (Maximum Overcurrent Protection Ampacity) Min – Max Voltage Range 187-253 Cooling (with Ceiling and Floor IDU) Running current 15.3... -
Page 26: Wiring Diagrams
37MBRAQ: Installation Instructions WIRING DIAGRAMS Fig. 31 —Wiring Diagram - Size 36K NOTE: Refer to the actual diagram on the unit. Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. - Page 27 37MBRAQ: Installation Instructions WIRING DIAGRAMS (CONT.) Fig. 32 —Wiring Diagram - Size 48K-58K NOTE: Refer to the actual diagram on the unit. Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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Page 28: Air Evacuation
37MBRAQ: Installation Instructions AIR EVACUATION CAUTION Manifold Gauge The service port (Schrader Fitting) for R454b refrigerant is a -76cmHg special fitting that requires a new type adapter. Compound Pressure gauge gauge The Service Port Adapter used for R410A refrigerant units will not High work with the new equipment. -
Page 29: Adding Refrigerant
37MBRAQ: Installation Instructions ADDING REFRIGERANT TRIPLE EVACUATION METHOD The triple evacuation method should be used when vacuum pump CAUTION is not capable of pumping down to 500 microns and system does not contain any liquid water. Refer to Fig. 36 and proceed as follows: 1. -
Page 30: Test Run
37MBRAQ: Installation Instructions TEST RUN TEST RUN INSTRUCTIONS 1. Open both the liquid and gas stop valves. CAUTION 2. Turn on the main power switch and allow the unit to warm up. 3. Set the air conditioner to COOL mode. -
Page 31: Troubleshooting
37MBRAQ: 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 has one red LED on the outdoor unit board and is limited to very few errors. The indoor diagnostic display is a combination of flashing LEDs on the display panel or the front of the unit. -
Page 32: Ductless Start-Up Checklist
37MBRAQ: Installation Instructions DUCTLESS 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 33: Performance Check
37MBRAQ: Installation Instructions Ductless 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 34 37MBRAQ: Installation Instructions © 2024 Carrier. All rights reserved. Edition Date: 10/24 Catalog No: 37MBRAQ-01SI Replaces: NEW Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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