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| Brand | McQuay |
|---|---|
| Model | MDS |
| Category | Air Conditioner |
| Language | English |
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.
Matrix showing compatibility between McQuay mainboards and various handset models.
Detailed operation guide for the G6 model remote control, explaining buttons and functions.
Detailed operation guide for the G7 model remote control, explaining buttons and functions.
Detailed operation guide for the G11 model remote control, explaining buttons and functions.
Detailed operation guide for the G17 model remote control, explaining buttons and functions.
Detailed operation guide for the GS01 model remote control, explaining buttons and functions.
Detailed operation guide for the APJ1 model remote control, explaining buttons and functions.
Detailed operation guide for the SLM3 model remote control, explaining buttons and functions.
Detailed operation guide for the SLM8 model remote control, explaining buttons and functions.
Operation guide for the sequential controller, covering modes, settings, and functions.
Operation guide for Netware 3 and 3C handsets, detailing their features and differences.
Operating instructions for the rooftop panel, including LCD display and button functions.
Operating instructions for the chiller panel, including LCD display and button functions.
Detailed operation guide for the MC301 model remote control, explaining buttons and functions.
Detailed operation guide for the MC303 model remote control, explaining buttons and functions.
Configuration for auto random restart function via PCB jumpers.
Details on three available selections for hot keep function based on jumpers.
Dip switch settings for sequential controller SQ2.0, including models and operating modes.
Jumper selection for W1V3 board to configure valve and heat pump modes.
Jumper settings for W2.0 board to configure operating modes and valve/heat pump functions.
Summary of hardware settings for SLM8 using jumpers for temperature range and turbo/quiet features.
Instructions for converting U1.5 heatpump PCB by adding heater relay, transistor, and diode.
Procedures for converting cooling-only and heatpump models to multi-split units.
Details on replacing U1.5 PCB with L208A PCB, including connector differences and spare parts.
Instructions for converting WMF U1.4 to L2EF, highlighting PCB and display panel compatibility.
Work indication for converting SQ board to support wiring up to 1000m.
Work indication for converting Sequential LCD for wiring up to 1000m.
Instructions on using the temperature sensor on the Netware 3 controller as a room sensor.
Table correlating LED indicators on different models with operation/faulty indications and actions.
Lists error codes and faulty indications for various handset models (SLM3, Netware 3).
Diagnosis information for MDS units, covering indoor and outdoor units, and error codes.
General troubleshooting steps for common unit malfunctions like no operation or fan issues.
Troubleshooting guide based on pressure readings (high/low side) and probable causes.
Table showing resistance values for sensors at different temperature points.
Compatibility matrix between MDS indoor PCBs, wired handsets, and outdoor PCBs.
Dip switch settings for MDS outdoor units based on PCB version and HP capacity.
Specifications for standard, optional, and maximum cable lengths for various wired handsets.
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