40MUAA Air Handler

Product Information

Specifications

• Model: 40MUAA
• Sizes: 18K to 60K

Product Usage Instructions

Installation

Please follow these steps to install the Air Handler fan coil
unit:

1. The installation should be done by authorized personnel
   only.

2. Use approved tubing and accessories for installation.

3. If you need technical assistance, service, or repair, contact
   the installer.

Operation

The Air Handler fan coil unit can be set up and operated using
either the remote control or the wired controller (both
provided).

Fan Only Mode

In this mode, the Air Handler fan coil unit operates as a fan to
circulate air without cooling or heating.

Cooling Mode

In the cooling mode, the Air Handler fan coil unit cools, dries,
and filters the room air to provide maximum comfort.

Accessories

The system is shipped with the following accessories:

FAQ (Frequently Asked Questions)

Q: Can anyone install the Air Handler fan coil unit?

A: No, the installation should be done by authorized personnel
only.

Q: How can I operate the Air Handler fan coil unit?

A: You can operate it using either the remote control or the
wired controller provided.

Q: What is the purpose of the Fan Only mode?

A: The Fan Only mode allows the Air Handler fan coil unit to
circulate air without cooling or heating.

Q: What does the Cooling mode do?

A: In the Cooling mode, the Air Handler fan coil unit cools,
dries, and filters the room air to provide maximum comfort.

40MUAA Sizes 18K to 60K

Owner’s Manual

TABLE OF CONTENTS
PAGE
A NOTE ABOUT SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 CONTROLS OPTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 REMOTE CONTROLLER FUNCTIONS . . . . . . . . . . . . . . . . . . . . 4 REMOTE SCREEN INDICATORS . . . . . . . . . . . . . . . . . . . . . . . . . 5 AUTO START . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 ENERGY SAVING RECOMMENDATIONS . . . . . . . . . . . . . . . . . 6 CARE AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Fig. 1 — Air Handler

A220698

NOTE TO EQUIPMENT OWNER:

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

DEALERSHIP CONTACT INFORMATION Company Name: __ Address:_____
Phone Number:____
Technician Name:__

Specifications subject to change without notice.

40MUAA: Owner’s Manual

A NOTE ABOUT SAFETY
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 severe personal injury or death.
2. WARNING signifies hazards that could result in personal injury or death.
3. CAUTION is used to identify unsafe practices which could result in minor personal injury or product and property damage.
NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.
WARNING
PERSONAL INJURY, DEATH AND / OR PROPERTY DAMAGE HAZARD Failure to follow this warning could result in personal injury, death or property damage. Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock, or other conditions which may cause personal injury or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance. The qualified installer or service agency must use factory-authorized kits or accessories when modifying this product. Read and follow all instructions and warnings, including labels shipped with or attached to the unit before operating your new air conditioner.

GENERAL
The Air Handler fan coil unit provides quiet, maximum comfort. In addition to cooling and/or heating, the Air Handler fan coil unit, matched with an outdoor condensing unit, filters and dehumidifies the air in the room to provide maximum comfort.
IMPORTANT: The Air Handler fan coil unit should be installed by authorized personnel only; using approved tubing and accessories. If technical assistance, service or repair is needed, contact the installer.
The Air Handler fan coil unit can be set up and operated from the remote control or the wired controller (both provided).
Operating Modes: The Air Handler fan coil unit has four operating modes: · FAN ONLY · AUTO · HEATING · COOLING
FAN ONLY
In the FAN ONLY mode, the system filters and circulates the room air without changing the room air temperature. AUTO In the AUTO mode, the system automatically cools or heats the room according to the user-selected set point. NOTE: AUTO mode is recommended for use on single zone applications only. Using AUTO changeover on multi-zone applications could set an indoor unit to STANDBY mode, indicated by two dashes (–) on the display, which turns the indoor unit off until all the indoor units are in the same mode; either COOLING or HEATING. NOTE: HEATING is the system’s priority mode. Simultaneous HEATING and COOLING is not allowed. HEATING In the HEATING mode, the system heats and filters the room air.
COOLING In the COOLING mode, the system cools, dries and filters the room air.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 2

40MUAA: Owner’s Manual

ACCESSORIES

The system is shipped with the following accessories (see Table 1). Keep the owner’s manual in a safe place and do not discard any accessories until the installation has been completed.

Table 1 — Accessories

Name

Shape

Quantit y

Owner’s and Installation Manual

2

Remote Controller
Batteries Suction Line Flare to Weld Adapter
3/4″ (18K-48K) 7/8″ (60K) Liquid Line Flare to Weld Adapter 3/8″ (All Sizes) Fasten Belt
Sponge
Flare Nut (18K-60K)
Accessories included with the outdoor unit
Drain Joint
Seal
Suction Line Flare to Weld Adapter
3/4″ (18K-48K) 7/8″ (60K) Liquid Line Flare to Weld Adapter 3/8″ (All Sizes)
Suction Line reducer

1 Drain Hose Drain Hose

Refrigerant Connecting Pipe

2
A220704
Fig. 2 — Air Handler 1

1

2 4

A220705

2

Fig. 3 –Indoor Unit Representation

1 1 1 1 1

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 3

40MUAA: Owner’s Manual
CONTROLS OPTIONS
The air handler fan coil unit can be controlled mainly through the following methods.
1. Wired controller (Not Included) – KSACN1001AAA Non-polarity controller used to operate all functions. The wired controller is equipped with an infrared receiver and can be used in conjunction with the wireless controller.
2. Wireless controller (Included) Hand-held wireless remote provides the same functionality as the wired controller and can be used independently or in conjunction with the wired controller.
3. Third party heat pump thermostat (Not Included) Allows the control of the air handler via the built-in 24V interface.
Refer to the installation manual for additional information.
REMOTE CONTROLLER FUNCTIONS
Review Figure 4 for a description of the remote controller functions.

ON/OFF Turns the unit on or off.
TEMP
Increases temperature in 1°F (1°C) increments. Max. temperature is 86°F (30°C).
SET Scrolls through operation functions as follows: I SENSE ( ) J AP mode( ) JI SENSE…
The selected symbol will flash on the display area, press OK to confirm.
TEMP Decreases temperature in 1°F(1°C) increments. Minimum temperature is 60 °F(16 °C).
FAN SPEED
Selects fan speeds in the following order: AUTO JLOW J MED JHIGH

TIMER ON
Sets timer to turn unit on. See How to Use Basic Functions.

Turbo
Enables unit to reach preset temperature in shortest possible time

MODE Scrolls through operation modes as follows: AUTO J COOL J DRY J HEAT J FAN
NOTE: Do not select HEAT mode if the machine you purchased is cooling only type. HEAT mode is not supported by the cooling only appliance.
SHORTCUT Use to restore the current settings or resume previous settings.
OK Use to con rm the selected functions.
SLEEP Saves energy during sleeping hours.
TIMER OFF Sets timer to turn unit off. See How to Use Basic Functions for details.
°C/°F The temperature display between the °C & °F.
LED
Turns indoor unit’s LED display and air conditioner buzzer on and off (model dependent), which creates a comfortable and quiet environment.

Fig. 4 –Remote Controller Functions

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 4

40MUAA: Owner’s Manual
REMOTE SCREEN INDICATORS
Transmission Indicator Lights up when remote sends signal to indoor unit

Sleep mode display I Sence feature display Wireless control feature display
Low battery detection display (If flashes)
MODE display Displays the current mode, including:

TIMER ON display
TIMER OFF display
FAN SPEED display Displays selected fan speed: LOW MED HIGH AUTO This fan speed can not be adjusted in AUTO or DRY mode.

LOCK display Displays when LOCK feature is activated.

Not available for this unit
TURBO mode display

Temperature/Timer/Fan speed display Displays the set temperature by default, or fan speed or timer setting when using TIMER ON/OFF functions.
Temperature range: 16-30oC/60-86 oF
Timer setting range: 0-24 hours
This display is blank when operating in FAN mode.

Fig. 5 — Remote Screen Indicators

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 5

40MUAA: Owner’s Manual

AUTO START
If the power fails while the unit is operating, the unit stores the operating condition, and the unit automatically starts operating under those conditions once the power is restored.
ENERGY SAVING RECOMMENDATIONS
The following recommendations will add greater efficiency to the ductless system:
· Select a comfortable thermostat setting and leave it at the selected setting. Avoid continually raising and lowering the setting.
· Keep the filter clean. Frequent cleaning may be necessary depending on the indoor air quality.
· Use drapes, curtains or shades to keep direct sunlight from heating the room on very hot days.
· Limit the unit’s run time by using the TIMER function. · Do not obstruct the air intake on the front panel. · Turn on the air conditioning unit before the indoor air becomes too
uncomfortable. · DO NOT set the unit to excessive temperature levels. · While cooling, close the curtains to avoid direct sunlight. · Doors and windows should be kept closed to keep cool or warm air
in the room. · DO NOT place objects near the air inlet and outlet of the unit. · Clean the air filter every two weeks. · Adjust the louvers properly and avoid direct airflow.

CARE AND MAINTENANCE
CLEANING YOUR INDOOR UNIT
CAUTION
BEFORE CLEANING OR MAINTAINING THE UNIT Always turn the unit off and disconnect its power supply before cleaning or maintaining the unit. When removing filter, do not touch metal parts in the unit. The sharp metal edges can cut. DO NOT use water to clean the inside of the indoor unit. This can destroy insulation and cause an electrical shock. DO NOT expose the filter to direct sunlight when drying. This can shrink the filter.
CAUTION
Any maintenance and cleaning of the outdoor unit should be performed by an authorized dealer or a licensed service provider. Any unit repairs should be performed by an authorized dealer or a licensed service provider.
Contact an authorized service technician for repair or maintenance. Improper repair and maintenance may cause water leakage, electrical shock, or fire and may void your warranty.
DO NOT substitute a blown fuse with a higher or lower amperage rating fuse, as this may cause circuit damage or an electrical fire.
Ensure the drain hose is set up according to the instructions. Failure to do so may cause leakage and result in personal property damage, fire and electric shock. Ensure all wires are connected properly. Failure to connect wires according to instructions can result in electrical shock or fire.

Closing curtains during heating also helps keep the heat in

Doors and windows should be kept closed

A220717

Fig. 6 –Close curtains, doors and windows

CAUTION
MAINTAINING THE UNIT Only use a soft, dry cloth to wipe the unit clean. If the unit is especially dirty, you can use a cloth soaked in warm water to wipe it clean. DO NOT use chemicals or chemically treated cloths to clean the unit. DO NOT use benzene, paint thinner, polishing powder or other solvents to clean the unit. They can cause the plastic surface to crack or deform. DO NOT use water hotter than 104°F (40°C) to clean the front panel. This can cause the panel to deform or become discolored. DO NOT wash the unit under running water. Doing so creates an electrical hazard. Clean the unit using a damp, lint-free cloth and neutral detergent. Dry the unit with a dry, lint-free cloth.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 6

40MUAA: Owner’s Manual

CLEANING THE FILTER
The filter prevents dust and other particles from entering the indoor unit. Dust buildup can reduce the efficiency of the air conditioner. For optimum efficiency, clean the air filter every two weeks or more frequently if you reside in a dusty area. Replace the filter with a new one if the filter is heavily clogged and cannot be cleaned.
NOTE: In households with animals, you may have to periodically wipe down the grille to prevent animal hair blocking the unit’s airflow.
1. Remove the filter cover. 2. Remove the air filter. 3. Clean the air filter by vacuuming the surface or washing the filter in
warm water with mild detergent.

3. Turn off the unit and disconnect the power.
A220723
Fig. 11 –Turn off the unit and disconnect the power
MAINTENANCE – PRE-SEASON INSPECTION
After long periods of non-use, or before periods of frequent use, do the following:

1. Check for damaged wires.

Fig. 7 –Remove the air filter cover

A220718

Fig. 12 –Check for damaged wires 2. Clean all filters

A220724

A220719
Fig. 8 –Cleaning filter with water or vacuum
MAINTENANCE ­ LONG PERIODS OF NON-USE
If you plan not to use the air conditioner for an extended period of time, perform the following steps:
1. Clean all filters.

Fig. 13 –Clean all filters 3. Check for leaks.

Fig. 9 –Clean all filters

A220720

2. Turn on the FAN function until the unit dries out completely.

Fig. 14 –Check for leaks 4. Ensure nothing is blocking the air inlets and outlets.

A220720 A220721

Fig. 10 –Turn on the FAN function

A220722

A220725
Fig. 15 –Remove obstacles blocking air inlets/outlets

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 7

40MUAA: 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. DO NOT attempt to fix these issues yourself. Contact an authorized service provider immediately!

The issues in Table 2 are not malfunctions and in most cased do not require repairs.

Table 2 — Common Issues

Issue
Unit does not turn on when user presses ON/OFF

Possible Causes
The unit has a 3-minute protection feature that prevents the unit from overloading. The unit cannot be restarted within three minutes after being turned off. COOLING and HEATING models: If the Operation light and PRE-DEF (Pre-heating/ Defrost) indicators are illuminated, the outdoor temperature is too cold and the unit’s anti-cold wind is activated to defrost the unit.

In the COOLING-only models: If the “Fan Only” indicator is illuminated, the outdoor temperature is too cold and the unit’s anti-freeze protection activates to defrost the unit.

The unit changes from COOL/ HEAT mode to FAN mode

The unit may change its setting to prevent frost from forming on the unit. Once the temperature increases, the unit starts operating in the previously selected mode again. The set temperature has been reached, at which point the unit turns off the compressor. The unit continues operating when the temperature fluctuates again.

The indoor unit emits white mist

In humid regions, a large temperature difference between the room’s air and the conditioned air can cause white mist.

Both the indoor and outdoor units emit white mist

When the unit restarts in the HEAT mode (after defrosting), white mist may be emit due to moisture generated from the defrosting process.

The indoor unit makes noises

A squeaking sound is heard when the system is OFF or in the COOL mode. The noise is also heard when the drain pump (optional) is operating. A squeaking sound may occur after running the unit in the HEAT mode due to expansion and contraction of the unit’s plastic parts.

Low hissing sound during operation: This is normal and is caused by refrigerant gas flowing through both the indoor and outdoor units.

Both the indoor unit and outdoor unit make noises

Low hissing sound when the system starts, has just stopped running, or is defrosting. This noise is normal and is caused by the refrigerant gas stopping or changing direction.

Squeaking sound: Normal expansion and contraction of plastic and metal parts caused by temperature changes during operation can cause squeaking noises.

The outdoor unit makes noises The unit makes different sounds based on the current operating mode.

Dust emits from either the indoor or outdoor unit

The unit may accumulate dust after extended periods of non-use. Dust can emit when the unit is turned on. This can be mitigated by covering the unit during long periods of inactivity.

The unit emits a bad odor

The unit may absorb odors from the environment (such as furniture, cooking, cigarettes, etc.) which will emit during operations. The unit’s filters have become moldy and should be cleaned.

The outdoor unit fan does not During operation, the fan speed is controlled to optimize product operation. operate

NOTE: If an issue persists, contact a local dealer or your nearest customer service center. Provide them with a detailed description of the unit’s malfunction as well as the unit’s model number.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 8

40MUAA: Owner’s Manual
TROUBLESHOOTING (CONT)
When issues occur, please review the following common issues in Table 3 prior to contacting a service company.

Problem
Poor Cooling Performance
The unit is not working The unit starts and stops frequently Poor heating performance

Table 3 — Troubleshooting Tips

Possible Causes

Solution

Temperature setting may be higher than the ambient room temperature

Lower the temperature setting

The heat exchanger on the indoor or outdoor unit is dirty

Clean the affected heat exchanger

The air filter is dirty

Remove the filter and clean it according to instructions

The air inlet or outlet of either unit is blocked.

Turn the unit to remove the obstruction and turn it back on

Doors and windows are open

Ensure all doors and windows are closed while operating the unit

Excessive heat is generated by sunlight

Close windows and curtains during periods of high heat or bright sunshine

There are too many heat sources in the room (people, computers, electronics, etc.)

Reduce the amount of heat sources

Low refrigerant due to leak or long-term use

Check for leaks, re-seal if necessary and top off the refrigerant

Power failure

Wait for the power to be restored

The power is turned off

Turn on the power

The fuse is burned out

Replace the fuse

The unit’s 3-minute protection has been activated Wait three minutes after restarting the unit

Timer is activated

Turn timer off

There is too much or too little refrigerant in the system

Check for leaks and recharge the system with refrigerant

Incompressible gas or moisture has entered the system Evacuate and recharge the system with refrigerant

System circuit is blocked

Determine which circuit is blocked and replace the malfunctioning piece of equipment

The compressor is broken

Replace the compressor

The voltage is too high or too low

Install a manostat to regulate the voltage

The outdoor temperature is extremely low

Use an auxiliary heating device

Cold air is entering through doors and windows

Ensure that all doors and windows are closed during use

Low refrigerant due to leak or long-term use

Check for leaks, re-seal if necessary and top off refrigerant

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 9

40MUAA: Owner’s Manual

© 2023 Carrier. All rights reserved.

Edition Date: 08/23

Catalog No: OM-40MUAA-02

A Carrier Company

Replaces: OM-40MUAA-01

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 10

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