McQuay SEASONCON ALP-100C User Manual

59 pages

Questions and Answers:

J
johnatkinsonAug 19, 2025
Why McQuay Heat Pump compressor will not run?
- R
  Randall GillSep 12, 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
mary29Aug 21, 2025
What to do if my McQuay Heat Pump has low suction pressure?
- C
  Cesar NguyenAug 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).
R
Riley ReynoldsAug 23, 2025
How to fix high discharge pressure in McQuay Heat Pump?
- M
  Melissa ShieldsAug 23, 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).
S
Sean HernandezAug 27, 2025
Why my McQuay Heat Pump compressor loses oil?
- R
  Robert McdanielAug 27, 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).
S
schultzjamesAug 29, 2025
How to reduce noise of vibrating McQuay Heat Pump compressor?
- J
  Jennifer RivasAug 29, 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).
J
John KirbySep 1, 2025
What causes low discharge pressure in McQuay Heat Pump?
- A
  Alexander BrownSep 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).
Y
yyangSep 3, 2025
What to do if McQuay Heat Pump has high suction pressure?
- Y
  ymarshallSep 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).
T
Timothy RiosSep 5, 2025
Why McQuay Heat Pump compressor thermal protector switch open?
- W
  Wanda MorganSep 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).
D
Dustin BakerSep 7, 2025
What causes McQuay Heat Pump compressor not to unload or load?
- N
  Nancy PerrySep 7, 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.
I
icallahanSep 9, 2025
What to do if liquid line solenoid will not open in McQuay Heat Pump?
- S
  Scott JonesSep 9, 2025
  Repair or replace the coil.

McQuay SEASONCON ALP-100C Specifications

General

Model	ALP-100C
Category	Heat Pump
Cooling Capacity	10.0 kW
Power Supply	380-415V/3Ph/50Hz
Refrigerant	R410A
Weight	85 kg

Summary

Refrigerant Piping Design and Installation

General Refrigerant Piping Recommendations

Covers general piping design principles, ASHRAE guidelines, and line sizing.

Suction and Liquid Line Sizing

Details recommendations for suction and liquid line sizing based on pressure drop.

System Charging Procedures

Explains the process for charging the system with refrigerant.

Field Wiring Requirements and Diagrams

Field Wiring Compliance and Options

Discusses wiring compliance, wire types, and single/multiple point power connections.

Wire Sizing Ampacities Table

Provides tables for selecting wire sizes based on electrical data and load requirements.

Normal Sequence of Operation for ALP Units

Unit Startup Sequence

Details the step-by-step process for starting the unit.

Pumpdown Operation Explanation

Explains the pumpdown function and its role in normal operation.

Typical Power Wiring Diagrams

Typical Control and Safeties Wiring Diagrams

Typical Thermostat Wiring Diagrams

Drawing Reference Decision Tables

Power Schematics Decision Table

Decision table to select the correct power schematic drawing based on unit configuration.

Control and Safety Schematics Decision Table

Decision table to select the correct control and safety schematic drawings.

Thermostat Control Schematic Decision Table

Decision table to select the correct thermostat control schematic drawings.

Startup and Shutdown Procedures

Pre-Startup Checks

Essential checks to perform before initial unit startup for safety and performance.

Initial Startup Process

Procedures for starting the unit for the first time, including checks and adjustments.

System Maintenance Procedures

Compressor Oil Level Management

Instructions on checking and adding oil to compressor crankcases.

Refrigerant Sightglass Interpretation

Service Procedures for Key Components

Filter-Drier Replacement

Thermostatic Expansion Valve Adjustment

Appendix: Controls and Safety Features

Oil Pressure Safety Control

Explains the function, testing, and operation of the oil pressure safety control.

High Pressure Control Operation

Details the operation and testing of the high pressure control switch.

Low Pressure Control Function

Explains the function and testing of the low pressure control for pumpdown.

FANTROL Head Pressure Control

Compressor Lockout Function

Compressor Motor Protector Module

Optional Compressor Unloaders

Optional Low Ambient Start Feature

Optional Phase/Voltage Monitor

Optional Hot Gas Bypass System

ALP Controls, Settings, and Functions Summary

High Pressure Control Settings

Low Pressure Control Settings

Compressor Motor Protector Details

Oil Pressure Control Settings

Compressor Lockout Time Delay

Troubleshooting Chart for Compressor Issues

Compressor Will Not Run

Lists possible causes and corrective steps for a compressor that will not run.

High Discharge Pressure Problems

Low Suction Pressure Issues

Loss of Oil or Nuisance Oil Pressure Trips

Compressor Oil Loss

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