Table of Contents
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45MUHAQ
Crossover Air Handler
Sizes 18K-60K
TABLE OF CONTENTS
A NOTE ABOUT SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
INDOOR UNIT PARTS AND MAJOR FUNCTIONS. . . . . . . . . . . 7
CONTROLS OPTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
WIRELESS REMOTE CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . 9
OPERATION INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
CARE AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
ERROR CODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Please read this Owner's Information Manual carefully before installing and using this appliance and keep this manual for future
reference.
For your convenience, please record the model and serial numbers of your new equipment in the spaces provided. This information, along
with the installation data and dealer contact information, will be helpful should your system require maintenance or service.
UNIT INFORMATION
Model # _______________________________
Serial # ________________________________
INSTALLATION INFORMATION
Date Installed ___________________________
Specifications subject to change without notice.
Owner's Manual
PAGE
NOTE TO EQUIPMENT OWNER:
DEALERSHIP CONTACT INFORMATION
Company Name: ______________________
Address:_____________________________
Phone Number:________________________
Technician Name:______________________
Fig. 1 - Sizes 18K - 60K
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Table of Contents
Troubleshooting
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Summary of Contents for Carrier 45MUHAQ Series
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Page 1: Table Of Contents
45MUHAQ Crossover Air Handler Sizes 18K-60K Owner’s Manual TABLE OF CONTENTS PAGE A NOTE ABOUT SAFETY ....... 2 For R454B refrigerant charge amount and minimum room area: . -
Page 2: A Note About Safety
45MUHAQ: Owner’s Manual A NOTE ABOUT SAFETY WARNING Any time you see this symbol in manuals, instructions and on the unit, be aware of the potential for personal injury. There are 3 levels of precaution: 1. DANGER identifies the most serious hazards which will result in PERSONAL INJURY, DEATH AND / OR PROPERTY severe personal injury or death. -
Page 3: For R454B Refrigerant Charge Amount And Minimum Room Area
45MUHAQ: Owner’s Manual This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. FOR CLASS B DIGITAL DEVICE NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. -
Page 4: Information Servicing
45MUHAQ: Owner’s Manual 1. Installation (where refrigerant pipes are allowed) a. The minimum test pressure for the low side of the system shall be –Any person who is involved with working on or breaking into a the low side design pressure and the minimum test pressure for the refrigerant circuit should hold a current valid certificate from an high side of the system shall be the high side design pressure, industry-accredited assessment authority, which authorizes their... - Page 5 45MUHAQ: Owner’s Manual 5. Presence of fire extinguisher effects. The check shall also take into account the effects of aging or continual vibration from sources such as compressors or fans. If any hot work is to be conducted on the refrigeration equipment or any associated parts, appropriate fire extinguishing equipment 13.
- Page 6 45MUHAQ: Owner’s Manual • Ensure that contamination of different refrigerants does not occur the recovery of refrigerant). Cylinders shall be complete with when using charging equipment. Hoses or lines shall be as short as pressure-relief valve and associated shut-off valves in good working possible to minimize the amount of refrigerant contained in them.
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Page 7: Accessories
45MUHAQ: Owner’s Manual ACCESSORIES INDOOR UNIT PARTS AND MAJOR FUNCTIONS The system is shipped with the following accessories (see Table 2). Keep the owner's manual in a safe place and do not discard any accessories Unit Parts until the installation has been completed. Table 2 —... -
Page 8: Controls Options
45MUHAQ: Owner’s Manual CONTROLS OPTIONS To further optimize the performance of the unit, perform the following steps: The air handler fan coil unit can be controlled mainly through the • Keep doors and windows closed. following methods. • Limit energy usage by using TIMER ON and TIMER OFF functions. •... -
Page 9: Wireless Remote Control
45MUHAQ: Owner’s Manual WIRELESS REMOTE CONTROL Before you begin using your new unit, familiarize yourself with the remote control. See page 10 through page 14 for more information on these controls ON/OFF MODE Turns the unit on or off. Scroll through operation modes as follows: AUTO COOL TEMP... -
Page 10: Transmission Indicator
45MUHAQ: Owner’s Manual Wireless Remote Control LCD Screen Indicators Information appears when the remote controller is powered up. Sleep mode display I Sence feature display Wireless control feature display Low battery detection display Transmission Indicator (If flashes) Lights up when remote sends signal to indoor MODE display unit... -
Page 11: Remote Control
45MUHAQ: Owner’s Manual REMOTE CONTROL Remote Control Operation - Quick Start All features may not be available. This remote is NOTE: NOTE: When transmitting a command from the remote control to shared across other indoor units. the unit, be sure to point the control toward the right side of the unit. -
Page 12: Basic Remote Control Operation
45MUHAQ: Owner’s Manual BASIC REMOTE CONTROL OPERATION AUTO Mode Before operation, ensure the unit is plugged in and power is available. In AUTO mode, the unit automatically selects the COOL, FAN, or HEAT operation based on the set temperature. COOL Mode For Reference For Reference Only... -
Page 13: Remote Control Functions
45MUHAQ: Owner’s Manual FAN Mode Setting the Room Temperature Set Point Press TEMP or TEMP to raise or lower the temperature. The unit confirms the signal receipt with a beep and the value of the set temperature appears on the display and changes accordingly. The temperature can be set between 62°F (17°C) and 86°F (30°C) in increments of 1°F or 1°C. -
Page 14: Led Light
45MUHAQ: Owner’s Manual UNIT OFF CLEAN Mode Press CLEAN to activate or deactivate the self-cleaning function. Under 1. Set TIMER ON as previously described. this function, the air conditioner automatically cleans and dries the 2. Set TIMER OFF as previously described. The unit starts evaporator. -
Page 15: Operation Instructions
45MUHAQ: Owner’s Manual OPERATION INSTRUCTIONS Other Features NOTES: Default Setting • Different models have different front panel and display window. When the unit restarts after a power failure, it will default to the factory Not all the indicators describing below are available for the air settings (AUTO mode, AUTO fan, 76°F (24°C)). -
Page 16: Care And Maintenance
45MUHAQ: Owner’s Manual CARE AND MAINTENANCE CAUTION CLEANING THE INDOOR UNIT CAUTION CLEANING AND MAINTENANCE WARNINGS Turn off the device and disconnect the power before cleaning. Failure BEFORE CLEANING OR MAINTENANCE to do so can cause electric shock. Always TURN OFF your AC system and disconnect its power DO NOT clean the air conditioner with excessive amounts of water. - Page 17 45MUHAQ: Owner’s Manual Maintaining Your AC Cleaning Your Indoor Unit (Air Filter) Maintenance – Long Periods of Non-Use If you plan not to use your air conditioner for an extended period of time, CAUTION do the following: Before changing the filter or cleaning, turn off the unit and disconnect its power supply.
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Page 18: Troubleshooting
45MUHAQ: Owner’s Manual TROUBLESHOOTING WARNING SAFETY PRECAUTIONS If any of the following conditions occur, turn off the unit immediately: The power cord is damaged or abnormally warm. You smell a burning odor. The unit emits loud or abnormal sounds. A power fuse blows or the circuit breaker frequently trips. Water or other objects fall into or out of the unit. -
Page 19: Troubleshooting (Cont)
45MUHAQ: Owner’s Manual TROUBLESHOOTING (CONT) When issues occur, please review the following common issues in Table 4 prior to contacting a service company. Table 4 — Troubleshooting Tips Problem Possible Causes Solution Temperature setting may be higher than the ambient Lower the temperature setting room temperature The heat exchanger on the indoor or outdoor unit is... -
Page 20: Error Codes
If you receive one of the codes in Table 6 , call a technician as soon as possible. No need to panic, the unit goes into TURBO mode until the error code is cleared. There is a “beep” noise coming from the indoor unit, which is normal in this case. © 2024 Carrier. All rights reserved. Edition Date: 10/24...
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Questions and answers
What are the heating and cooling values of 37muhaq48aa3
The Carrier 45MUHAQ Series model 37MUHAQ48AA3 supports the following temperature ranges:
- Cooling Mode Room Temperature: 60°F to 90°F (16°C to 32°C)
- Heating Mode Room Temperature: 32°F to 86°F (0°C to 30°C)
- Cooling Mode Outdoor Temperature: -13°F to 122°F (-25°C to 50°C) for Regular Heat Series or -22°F to 122°F (-30°C to 50°C) for Hyper Heat Series
- Heating Mode Outdoor Temperature: -13°F to 75°F (-25°C to 24°C) for Regular Heat Series or -22°F to 75°F (-30°C to 24°C) for Hyper Heat Series
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