McQuay SEASONCON ALP-037A User Manual (English)

Questions and Answers:

K
Keith PattersonAug 16, 2025
What to do if my McQuay SEASONCON ALP-037A compressor will not run?
- J
  Jack SimsAug 16, 2025
  If the McQuay Heat Pump compressor won't run, first close the switch. Then, check the electrical circuits and motor winding for shorts or grounds, and investigate for possible overloading. Replace the fuse or reset breakers after correcting the fault. Check the motor for opens, short circuits, or burn out. Also, check all wire junctions and tighten all terminal screws. Finally, check the unit closely when it comes back online. If none of this helps, repair or replace the faulty components. If the safety switch is off, determine the type and cause of the shutdown and correct it before resetting it. If the unit is not calling for cooling, wait until it does.
S
Steve GarciaAug 18, 2025
Why do motor overload relays open or fuses blow in my McQuay SEASONCON ALP-037A?
- D
  Douglas LeAug 19, 2025
  If the motor overload relays are open or fuses are blown on your McQuay Heat Pump, check the supply voltage for excessive line drip. Inspect all connections and tighten them. Also, check the supply voltage and notify the power company if there are any issues, and do not start the unit until the fault is corrected. Provide ventilation to reduce heat. Repair or replace the starter or time delay mechanism. Consider replacing the compressor motor. Refer to the corrective steps for high discharge pressure as well.
L
Laura FoxAug 22, 2025
What causes little or no oil pressure in my McQuay SEASONCON ALP-037A?
- L
  Lindsey MyersAug 22, 2025
  If there is little or no oil pressure in your McQuay Heat Pump, try the following: Clean the components. Check the crankcase heater, reset the expansion valve for higher superheat, and check the liquid line solenoid valve operation. Add oil. Check and tighten the system, and replace the gasket if needed. Adjust the thermal expansion valve. If these steps don't resolve the issue, consider replacing the oil filter, oil pressure regulating valve, or the compressor itself. Reverse the direction of compressor rotation, if applicable. Keep valve closed except when taking readings. Finally, repair or replace any faulty components.
C
Cody WestAug 25, 2025
What to do if my McQuay SEASONCON ALP-037A Heat Pump has high discharge pressure?
- I
  iparkerAug 26, 2025
  If your McQuay Heat Pump has high discharge pressure, purge any non-condensibles. Remove excess refrigerant, open the valve, and check the electrical circuit.
Z
Zachary PenaAug 27, 2025
How to troubleshoot low suction pressure in a McQuay SEASONCON ALP-037A Heat Pump?
- G
  George MooreAug 28, 2025
  If your McQuay Heat Pump has low suction pressure, check for leaks, repair them, and add refrigerant. Clean chemically. Replace the cartridge. Clean the strainers. Check and reset for proper superheat. Check the means for regulating condensing temperature. See Corrective Steps for failure of compressor to unload.
C
Christine HudsonAug 31, 2025
What causes low discharge pressure in my McQuay Heat Pump?
- H
  htaylorAug 31, 2025
  If your McQuay Heat Pump has low discharge pressure, check the condenser control operation and open the valve. Check for leaks, repair them, and add charge. Also, refer to the corrective steps for low suction pressure and for failure of the compressor to load up.
S
Shawn BautistaSep 3, 2025
Why does my McQuay Heat Pump have high suction pressure?
- J
  Jesse MooreSep 3, 2025
  If your McQuay Heat Pump has high suction pressure, reduce the load or add additional equipment. Check the remote bulb and regulate superheat. Refer to the corrective steps for failure of the compressor to load up.
E
ehuffSep 5, 2025
How to fix a noisy or vibrating McQuay SEASONCON ALP-037A compressor?
- K
  Karen HornSep 6, 2025
  If the compressor in your McQuay Heat Pump is noisy or vibrating, check the setting of the expansion valve. Relocate, add, or remove hangers. If the problem persists, replace the compressor.
R
reednicholasSep 9, 2025
What should I do if my McQuay Heat Pump compressor loses oil?
- T
  teresamitchellSep 9, 2025
  If the compressor in your McQuay Heat Pump is losing oil, check for leaks and repair them. Add refrigerant. If the problem continues, replace the compressor.
J
James BrewerSep 12, 2025
What to do if McQuay SEASONCON ALP-037A compressor will not unload or load up?
- W
  William StewartSep 12, 2025
  If the compressor on your McQuay Heat Pump will not unload or load up, replace the compressor. Alternatively, reset the pressurestat setting to fit the application.

McQuay SEASONCON ALP-037A Specifications

General

Category	Heat Pump
Model	SEASONCON ALP-037A
Cooling Capacity	3.7 kW
Heating Capacity	4.0 kW
Refrigerant	R410A
Power Supply	220-240V, 50Hz

Summary

Introduction to the McQuay Seasoncon Unit

General Description of the Unit

Overview of the Seasoncon air-cooled condensing unit's design and capabilities.

Unit Nomenclature Explained

Explanation of the model naming convention and component identification.

Inspection Upon Receiving the Unit

Procedures for checking the unit for damage and verifying shipment completeness.

Unit Installation Guidelines

Proper Unit Handling and Lifting

Instructions for safely moving and positioning the condensing unit.

Selecting the Unit Location

Recommendations for optimal placement considering airflow and winds.

Ensuring Service Access

Requirements for accessibility to unit components for maintenance.

Required Unit Clearances

Minimum space requirements around the unit for proper operation and service.

Vibration Isolator Information

Vibration Isolator Selection and Load Data

Guidance on selecting and applying vibration isolators based on unit size and loads.

Refrigerant Piping Requirements

General Refrigerant Piping Guidelines

Basic principles for connecting refrigerant lines to the unit.

Evaporator Above/Below Condensing Unit Piping

Specific piping considerations for different evaporator installation configurations.

Liquid Line Components

Details on available liquid line accessory kits and their components.

Unit Dimensional Drawings

Unit Dimensions and Connection Sizes

Detailed physical dimensions and refrigerant/electrical connection sizes.

Field Wiring and Components

Hot Gas Bypass Kit Components

Description of the optional hot gas bypass accessory kit.

Refrigerant Charge and Pumpdown Capacity

Information on the R-22 refrigerant charge and pumpdown capacity.

Typical Field Wiring Diagrams

Schematics illustrating field wiring for thermostats and controls.

Unit Layout and Principles of Operation

Major Component Locations by Unit Size

Illustrations showing component placement and compressor/fan horsepower.

Control Center Layout and Components

Description and diagrams of the weatherproof control center compartments.

Sequence of Operation for Cooling

Step-by-step explanation of how the unit operates to provide cooling.

Pumpdown Cycle Explanation

How the unit manages refrigerant during shutdown.

Electrical Schematics and Legends

Electrical Legend for Schematic Symbols

Definitions of symbols used in electrical diagrams.

Power Schematics for Motors

Wiring diagrams for compressor and condenser fan motors.

Compressor Control Schematics

Detailed wiring diagrams for compressor control circuits.

Thermostat Circuit Schematics

Wiring diagrams illustrating thermostat connections and logic.

Start-Up and Shutdown Procedures

Pre Start-Up Inspection Checklist

Essential checks to perform before the initial unit start-up.

Initial Unit Start-Up Sequence

Step-by-step instructions for starting the unit for the first time.

Temporary and Extended Shutdown

Procedures for safely shutting down the unit for short or long periods.

System Maintenance Procedures

General Maintenance and Checks

Routine service tasks and checks for optimal unit performance.

Compressor Oil Level Monitoring

How to check and maintain the compressor oil level.

Refrigerant Sightglass Inspection

Checking the sightglass for refrigerant charge status.

Service Actions and Component Replacement

Filter-Drier Core Replacement

Procedure for pumping down and replacing filter-drier cores.

Liquid Line Solenoid Valve Service

Maintenance and replacement of liquid line solenoid valves.

Thermostatic Expansion Valve Service

Adjusting superheat and servicing the expansion valve.

Warranty and Appendix Information

In-Warranty Return Material Procedure

Guidelines for returning parts under warranty for inspection.

Standard Controls - Oil Pressure Safety Control

Description and testing procedure for the oil pressure safety control.

Control System Descriptions

High Pressure Control Operation

How the high-pressure safety switch functions.

Low Pressure Control Operation

How the low-pressure switch operates for unit control.

FANTROL Head Pressure Control

System for automatic condenser fan control based on pressure.

Optional Control Systems

SPEEDTROL Head Pressure Control

Variable speed fan control for head pressure management.

DAMPERTROL Head Pressure Control

Damper system for reducing condenser capacity.

Optional Part Winding Start

Method to reduce compressor start-up current.

Specialized Optional Controls

Low Ambient Start (Optional)

Enables unit operation at low ambient temperatures.

Compressor Lockout (Optional)

Prevents rapid compressor cycling during erratic cooling demands.

Hot Gas Bypass System

Hot Gas Bypass Operation and Adjustment

System for maintaining minimum evaporator pressure and oil return.

Troubleshooting Common Issues

Troubleshooting Chart for Common Problems

Guide to identifying causes and corrective steps for unit malfunctions.

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McQuay SEASONCON ALP-037A User Manual

Table of Contents

Questions and Answers:

McQuay SEASONCON ALP-037A Specifications

Summary

Introduction to the McQuay Seasoncon Unit

General Description of the Unit

Unit Nomenclature Explained

Inspection Upon Receiving the Unit

Unit Installation Guidelines

Proper Unit Handling and Lifting

Selecting the Unit Location

Ensuring Service Access

Required Unit Clearances

Vibration Isolator Information

Vibration Isolator Selection and Load Data

Refrigerant Piping Requirements

General Refrigerant Piping Guidelines

Evaporator Above/Below Condensing Unit Piping

Liquid Line Components

Unit Dimensional Drawings

Unit Dimensions and Connection Sizes

Field Wiring and Components

Hot Gas Bypass Kit Components

Refrigerant Charge and Pumpdown Capacity

Typical Field Wiring Diagrams

Unit Layout and Principles of Operation

Major Component Locations by Unit Size

Control Center Layout and Components

Sequence of Operation for Cooling

Pumpdown Cycle Explanation

Electrical Schematics and Legends

Electrical Legend for Schematic Symbols

Power Schematics for Motors

Compressor Control Schematics

Thermostat Circuit Schematics

Start-Up and Shutdown Procedures

Pre Start-Up Inspection Checklist

Initial Unit Start-Up Sequence

Temporary and Extended Shutdown

System Maintenance Procedures

General Maintenance and Checks

Compressor Oil Level Monitoring

Refrigerant Sightglass Inspection

Service Actions and Component Replacement

Filter-Drier Core Replacement

Liquid Line Solenoid Valve Service

Thermostatic Expansion Valve Service

Warranty and Appendix Information

In-Warranty Return Material Procedure

Standard Controls - Oil Pressure Safety Control

Control System Descriptions

High Pressure Control Operation

Low Pressure Control Operation

FANTROL Head Pressure Control

Optional Control Systems

SPEEDTROL Head Pressure Control

DAMPERTROL Head Pressure Control

Optional Part Winding Start

Specialized Optional Controls

Low Ambient Start (Optional)

Compressor Lockout (Optional)

Hot Gas Bypass System

Hot Gas Bypass Operation and Adjustment

Troubleshooting Common Issues

Troubleshooting Chart for Common Problems

Related product manuals