McQuay MLC025B User Manual

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CEILING CASSETTE

SPLIT TYPE

AIR CONDITIONER

INSTALLATION MANUAL

COVER-CK-20A 2/1/01, 10:34 AM3

Questions and Answers:

L
lindsey16Aug 12, 2025
What to do if my McQuay Air Conditioner unit does not operate?
- L
  Lauren FrazierAug 12, 2025
  If your McQuay Air Conditioner unit isn't operating, there are several things you can check: * First, ensure there isn't a power failure or a blown fuse by checking the power supply. * Make sure the power plug is securely connected. * Verify that the delay timer is set correctly. If the issue continues after checking these items, it is best to contact the air conditioner unit installer.
M
Mrs. Melissa Butler DVMAug 16, 2025
How to increase air flow in McQuay Air Conditioner?
- B
  Brenda PerezAug 16, 2025
  If the air flow from your McQuay Air Conditioner is too low, consider the following: 1. Clean the air filter to remove any accumulated dust or debris. 2. Ensure that all doors and windows are closed to maintain optimal cooling efficiency. 3. Check for and clear any obstructions blocking the air suction and discharge points. 4. Increase the regulated temperature, as a lower temperature setting can sometimes reduce airflow.
L
Lisa BeltranAug 19, 2025
Why is there condensation on my McQuay Air Conditioner?
- M
  Misty PhillipsAug 19, 2025
  Condensation on the front air grille of your McQuay indoor unit is typically due to air humidity or a too-low temperature setting after prolonged use. To address this, increase the temperature setting and operate the unit at a high fan speed.
J
James PhillipsAug 23, 2025
How to eliminate bad odor from McQuay MLC025B?
- J
  Jacqueline LeeAug 23, 2025
  If your McQuay Air Conditioner discharge air flow has a bad odor, it's likely due to particles like cigarette smoke or perfume that have adhered to the coil. Cleaning the coil should remove these odors.
J
Jon OconnorAug 27, 2025
How to increase air flow in my McQuay MLC025B Air Conditioner?
- A
  Angela StewartAug 27, 2025
  If the airflow from your McQuay Air Conditioner is too low, try the following: 1. Clean the air filter. 2. Close any open doors and windows. 3. Clear any blockages from the air suction and discharge areas. 4. Increase the temperature setting.
M
Mark HallAug 30, 2025
Why is my McQuay Air Conditioner hissing?
- J
  jgomezAug 30, 2025
  The hissing sound you hear from your McQuay air conditioner during operation is caused by refrigerant fluid flowing into the evaporator coil.
E
Edward BurnsSep 3, 2025
Why McQuay MLC025B compressor does not operate after starting?
- K
  kathleen45Sep 3, 2025
  The compressor on your McQuay air conditioner may take 3 to 4 minutes to start operating after the unit is turned on. Please wait for this period.
R
Rachel MooreSep 7, 2025
How to fix bad odor from McQuay MLC025B?
- T
  Tamara WilliamsSep 7, 2025
  If your McQuay Air Conditioner discharge air flow has a bad odor, the coil may have absorbed odors from sources like cigarettes, smoke, or perfume. Cleaning the coil should resolve this issue.

McQuay MLC025B Specifications

General

Model	MLC025B
Category	Air Conditioner
Cooling Capacity	25, 000 BTU/h
Energy Efficiency Ratio (EER)	10.5
Voltage	208/230V
Phase	1
Frequency	60Hz

Summary

Ceiling Cassette Split Type Air Conditioner Installation Manual

Safety Precautions

Installation Diagram

Indoor Unit Installation

Indoor Unit Preliminary Site Survey

Guidelines for preliminary site survey for indoor unit installation.

Indoor Unit Installation Procedure

Details on positioning, drilling, and hanging the indoor unit.

Indoor Unit Hanging

Steps for securely hanging the indoor unit using hanging rods.

Indoor Unit Drain Piping Work

Instructions for proper drain pipe installation and gradient.

Indoor Unit Drain Test

Procedure for testing drain piping for leaks and proper flow.

Indoor Unit Panel Installation

Steps for installing the front panel, air intake grille, and connecting wires.

Air Intake Grille and Filter Installation

Outdoor Unit Installation

Outdoor Unit Preliminary Site Survey

Guidelines for selecting a suitable location for the outdoor unit.

Outdoor Unit Mounting

Instructions for firmly and horizontally mounting the outdoor unit with clearance.

Refrigerant Piping Work

Refrigerant Piping Length and Elevation

Recommendations for maximum piping length and elevation differences.

Refrigerant Piping Connection

Steps for connecting refrigerant pipes, including brazing and tightening.

Refrigerant Additional Charge

Guidance on calculating and adding refrigerant based on pipe length.

Electrical Wiring Connection

Electrical Wiring Connection (Cooling Only)

Wiring specifications for cooling-only models.

Wiring Diagram (CK20A/25A/30A)

Wiring Diagram (CK30A/40A/50A)

Wiring Diagram (CK30A / SL30C)

Wiring Diagram (CK40A/50A / SL40C/50C)

Electrical Wiring Connection (Heat Pump CK20AR/25AR)

Wiring Diagram (CK20AR/25AR <> SL20BRK/25BRK)

Wiring Diagram (CK30AR/40AR/50AR)

Wiring Diagram (CK30AR <> SL30CR)

Wiring Diagram (CK40AR/50AR <> SL40CR/50CR)

Vacuuming and Charging

Vacuuming Procedure

Steps for vacuuming the air conditioner system to remove moisture and air.

Refrigerant Charging Procedure

Steps for charging refrigerant after vacuuming and system checks.

Overall Checking

Pre-Operation Checks

Test Run Procedure

Steps for conducting a test run and checking unit operation.

Post-Test Run Confirmations

Servicing Safety Warning

Service and Maintenance

Indoor Air Filter Maintenance

Indoor Unit Cleaning

Trouble Shooting

Trouble: Compressor Not Starting

Trouble: Unit Not Operating

Trouble: Low Air Flow

Trouble: Water Leakage

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