McQuay SEASONCON ALP-080C

59 pages

Questions and Answers:

M
Michael AndrewsAug 19, 2025
Why McQuay Heat Pump compressor will not run?
- J
  Jason PatelAug 19, 2025
  The compressor might not be running due to several reasons. The main switch could be open (close it), a fuse could be blown (replace the fuse or reset breakers after correcting the fault), or circuit breakers could be open (check electrical circuits and motor winding for shorts or grounds). Thermal overloads might have tripped (check the unit closely when it comes back online), the contactor or coil could be defective (repair or replace it), or the system might have been shut down by safety devices (determine the type and cause of shutdown and correct it before resetting the safety switch).
M
Matthew RodgersAug 21, 2025
What to do if my McQuay Heat Pump has low suction pressure?
- M
  mcknightsethAug 21, 2025
  Low suction pressure may be due to several factors. There could be a lack of refrigerant (check for leaks, repair, and add charge), a dirty evaporator (clean it chemically), or a clogged liquid line filter-drier (replace it). Additionally, the suction line or compressor suction gas could be clogged (clean strainers), the expansion valve might be malfunctioning (check and reset for proper superheat), or the condensing temperature may be too low (check the means for regulating condensing temperature).
B
blevinsbillyAug 25, 2025
How to fix high discharge pressure in McQuay Heat Pump?
- E
  Emma DanielAug 25, 2025
  High discharge pressure can occur due to several reasons: there may be noncondensables in the system (purge them), the system might be overcharged with refrigerant (remove the excess), the discharge shutoff valve could be partially closed (open the valve), or the fan might not be running (check the electrical circuit).
J
Jennifer PadillaAug 28, 2025
Why my McQuay Heat Pump compressor loses oil?
- C
  Charles ReevesAug 28, 2025
  The compressor may lose oil due to a lack of refrigerant (check for leaks and repair; add refrigerant), excessive compression ring blow-by (replace the compressor), suction superheat being too high (adjust superheat), or a burned-out crankcase heater (replace the crankcase heater). Other causes may include insufficient oil in the system (add oil until the sight glass is 1/3 full), suction risers that are too large (check line sizing at design conditions and change if incorrect), or insufficient traps in suction risers (install suction P-traps at each 20-foot vertical rise).
J
johnstephensonAug 30, 2025
How to reduce noise of vibrating McQuay Heat Pump compressor?
- D
  drew43Aug 30, 2025
  A noisy or vibrating compressor may be caused by flooding of refrigerant into the crankcase (check the setting of the expansion valve) or improper piping support on the suction or liquid line (relocate, add, or remove hangers).
L
Lauren RoachSep 1, 2025
What causes low discharge pressure in McQuay Heat Pump?
- T
  Thomas KempSep 1, 2025
  Low discharge pressure can be attributed to a dirty condenser coil (clean the coil) or a FANTROL out of adjustment (adjust FANTROL settings).
C
Carla DelacruzSep 3, 2025
What to do if McQuay Heat Pump has high suction pressure?
- D
  david46Sep 3, 2025
  High suction pressure can be caused by an excessive load (reduce the load or add additional equipment) or an expansion valve overfeeding (check the remote bulb and regulate superheat).
S
Samantha CarterSep 5, 2025
Why McQuay Heat Pump compressor thermal protector switch open?
- S
  Samantha HoffmanSep 5, 2025
  The compressor thermal protector switch might be open due to operating beyond design conditions (add facilities so conditions are within allowable limits), a discharge valve being partially shut (open the valve), or a blown valve plate gasket (replace the gasket).
K
kimberly31Sep 7, 2025
What causes McQuay Heat Pump compressor not to unload or load?
- M
  Matthew MorrisSep 8, 2025
  The compressor's failure to unload or load may be due to a defective capacity control (replace it), a defective unloader mechanism (replace it), or a faulty thermostat stage or broken capillary tube (replace it). Also, ensure that the thermostat setting is appropriate for the application by resetting it.
W
Wayne EllisSep 9, 2025
What to do if liquid line solenoid will not open in McQuay Heat Pump?
- M
  Michele CurtisSep 9, 2025
  Repair or replace the coil.

McQuay SEASONCON ALP-080C Specifications

General

Brand	McQuay
Model	SEASONCON ALP-080C
Category	Heat Pump
Language	English

Summary

Introduction and Installation

Handling

Guidance on safely moving and lifting the unit to prevent damage.

Evacuation and Charging

Evacuation

Procedure for removing air and moisture from the system using vacuum pumps.

Charging the System

Steps for charging the system with refrigerant, including initial and final stages.

Refrigerant Charge

Normal Sequence of Operation

Startup

Initial startup procedures for the unit.

Pumpdown

Explanation of the pumpdown cycle and its purpose.

Startup and Shutdown Procedures

Pre-Startup Checks

Checks before initial unit startup.

Initial Startup

Steps for starting the unit for the first time.

Temporary Shutdown

Startup After Temporary Shutdown

Extended Shutdown

System Maintenance

General Maintenance Checks

Compressor Oil Level

Checking and adding oil to the compressor.

Refrigerant Sightglass Observation

Service Procedures

Filter-Drier Replacement

Procedure for changing filter-driers in the system.

Liquid Line Solenoid Valve Maintenance

Thermostatic Expansion Valve

Appendix: Standard Controls

Oil Pressure Safety Control

How the oil pressure safety control operates and is checked.

Appendix: Optional Controls

Compressor Unloaders

Low Ambient Start

Function of the optional low ambient start for cold weather operation.

High Ambient Control

Part Winding Start

PhaseVoltage Monitor and Hot Gas Bypass

PhaseVoltage Monitor

Function of the optional phase/voltage monitor for motor protection.

Hot Gas Bypass

Explanation and diagram of the optional hot gas bypass system.

ALP Controls, Settings, and Functions

High Pressure Control Settings

Detailed settings for the high-pressure control.

Low Pressure Control Settings

Detailed settings for the low-pressure control.

Compressor Motor Protector

Function and settings for the motor protector.

Oil Pressure Control

Function and settings for the oil pressure control.

High Ambient Unloader Pressure Control

FANTROL Condenser Pressure Control

Speedtrol Head Pressure Control

Unit Thermostat (Master)

Compressor Lockout Time Delay

Function and setting of the lockout time delay.

Part Winding Start Time Delay

ALP Controls, Settings, and Functions (Continued)

Low Ambient Start Time Delay

Function and setting of the low ambient start time delay.

Compressor Sequencing Time Delays

Compressor Unloaders Controlled Remotely

Suction Unloader Pressure Control

Troubleshooting Chart

Compressor Will Not Run

Possible causes and corrective steps for a non-running compressor.

Compressor Noisy or Vibrating

Possible causes and corrective steps for noise and vibration.

High Discharge Pressure

Low Discharge Pressure

High Suction Pressure

Low Suction Pressure

Compressor Will Not Unload or Load

Compressor LoadingUnloading Intervals Too Short

Loss of Oil Pressure or Nuisance Oil Pressure Control Trips

Causes and steps for oil pressure issues.

Compressor Loses Oil

Possible causes and corrective steps for oil loss.

Troubleshooting Chart (Continued)

Motor Overload Relays Open or Blown Fuses

Causes and steps for motor overload or fuse issues.

Compressor Thermal Protector Switch Open

Causes and steps for thermal protector trips.

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