What to do if my McQuay M4LC is not cooling enough?
If your McQuay Air Conditioner isn't cooling sufficiently, it might be due to a dirty indoor or outdoor coil. Try cleaning the coil. Also check for any obstructions at the air inlet or outlet of the indoor or outdoor unit and remove them. It could also be caused by a refrigerant short charge or leakage, in which case you should add refrigerant and repair the leakage.
How to fix a McQuay M4LC that won't turn on (no cooling/heating)?
If your McQuay Air Conditioner fails to start, it could be due to a faulty contactor, contacts or motor. Try changing the contactor or the contacts. You might also need to repair or change the motor.
Why McQuay Air Conditioner shows high side low side?
If your McQuay Air Conditioner is showing a high side low side issue, it could be due to: * An undercharge of refrigerant. * Refrigerant leakage. * A clogged or dirty air filter in the indoor unit. * A locked indoor fan (during cooling). * A defective defrost control causing outdoor coil freeze-up (during heating). * A locked outdoor fan (during heating).
General| Model | M4LC |
|---|---|
| Refrigerant | R-410A |
| Phase | 1 |
| Type | Air Conditioner |
| Voltage | 208/230V |
Lists McQuay brand and generic model names for various fan coil units and condensing units.
Provides conversion factors for capacity, pressure, flow rate, temperature, velocity, volume, and area.
A matrix showing compatibility between different McQuay main boards and various handset models.
Explains the operation of the G6 remote control, covering buttons, modes, and functions like sleep and timer.
Details the operation of the G7 remote control, including its buttons, modes, and special functions like turbo and clock setting.
Describes the functions and operation of the G11 remote control, including temperature, mode, fan speed, and sleep settings.
Covers the operation of the G17 remote control, including personalize settings, turbo function, and sleep mode.
Explains the operation of the GS01 remote control, covering modes, fan speed, automatic air swing, and turbo function.
Details the operation of the APJ1 remote control, focusing on its LCD display, ECONO, POWERFUL, and COMFORT modes.
Describes the operation of the SLM3 controller, including temperature setting, operation modes, fan speed, timer, and sleep mode.
Explains the operation of the SLM8 controller, covering mode, turbo fan speed, automatic air swing, quiet fan speed, and timer functions.
Explains the operation of Netware 3 and Netware 3C controllers, including modes, fan speed, and sleep mode settings.
Details the operation of the Rooftop Panel, including its LCD display, ON/OFF switch, and various mode buttons.
Describes the operation of the Chiller Panel, including its LCD display, ON/OFF switch, and mode selection buttons.
Explains the operation of the MC301 controller, covering ON/OFF, temperature setting, fan speed, mode setting, and sleep functions.
Explains how to configure the auto random restart function using jumpers on the main board.
Details the three available selections for the hot keep function, configurable via slide switches or jumpers.
Describes the dip switch settings for the Sequential Board (SQ2.0), covering models, operating modes, and hot keep options.
Explains jumper settings for W1V3 fan coil units to configure valve and heat pump modes.
Details jumper configurations for W2.0 fan coil units to select operating modes and set valve/heat options.
Outlines hardware settings for SLM8, specifically jumper configurations for temperature range and turbo/quiet features.
Provides instructions for converting U1.5 Heatpump PCB to auxiliary heater application by adding components.
Explains how to convert Cooling Only and Heatpump models to Multi Split units using jumpers and slide switches.
Details the differences and necessary spare parts for converting U1.5 units to L208A, focusing on connector types.
Describes the conversion from WMF U1.4 to L2EF, noting PCB compatibility and incompatible display/switch board pins.
Provides work instructions to convert SQ Board for wiring up to 1000m, involving jumper removal and component soldering.
Details the steps for converting Sequential LCD for long-distance wiring, including component additions.
Explains how to use the temperature sensor on the Netware 3 controller as a room sensor.
Diagnoses faults for Wall Mounted F Series Cooling Only units using LED indicator patterns.
Lists error codes and faulty indications for various McQuay models diagnosed via handset.
Provides diagnosis information for MDS Indoor Units via LED indicators and wired controller codes.
Provides a general troubleshooting guide for common AC malfunctions, listing symptoms, check items, and suggested actions.
Offers troubleshooting advice based on pressure readings (high/low side) to identify probable causes of AC issues.
Provides resistance values (kΩ) for sensors across a range of temperatures (T°C) for specific McQuay models.
Shows compatibility matrices between MDS indoor PCBs, wired handsets, and outdoor PCBs.
Details the dip switch settings for MDS Outdoor Units based on PCB version and HP capacity.
Lists recommended cable types and lengths (standard, optional, maximum) for various wired handsets.
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