McQuay SEASONCON ALP-070C User Manual

59 pages

Questions and Answers:

C
Crystal WhiteAug 19, 2025
Why McQuay Heat Pump compressor will not run?
- S
  Stephanie GrayAug 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).
R
Rebecca GonzalesAug 21, 2025
What to do if my McQuay Heat Pump has low suction pressure?
- D
  darrell24Aug 22, 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).
M
Matthew JohnsonAug 23, 2025
How to fix high discharge pressure in McQuay Heat Pump?
- G
  gerald75Aug 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).
M
Mercedes FitzgeraldAug 28, 2025
Why my McQuay Heat Pump compressor loses oil?
- K
  Keith TurnerAug 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).
C
Courtney KerrAug 30, 2025
How to reduce noise of vibrating McQuay Heat Pump compressor?
- D
  Denise MurphyAug 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).
M
Melissa AcostaSep 1, 2025
What causes low discharge pressure in McQuay Heat Pump?
- J
  Jodi GeorgeSep 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
Christina SandersSep 3, 2025
What to do if McQuay Heat Pump has high suction pressure?
- D
  Dennis BrownSep 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).
R
Richard NguyenSep 5, 2025
Why McQuay Heat Pump compressor thermal protector switch open?
- B
  bensonphilipSep 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).
S
Sarah HarrisSep 8, 2025
What causes McQuay Heat Pump compressor not to unload or load?
- F
  floresjesseSep 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.
A
Amanda ThomasSep 10, 2025
What to do if liquid line solenoid will not open in McQuay Heat Pump?
- J
  John JonesSep 10, 2025
  Repair or replace the coil.

McQuay SEASONCON ALP-070C Specifications

General

SEER	16
Power Supply	220-240V/1Ph/50Hz
Refrigerant	R410A
Sound Pressure Level (Indoor)	38 dB(A)
Cooling Capacity (BTU/h)	24000
Cooling Capacity (kW)	7.0

Summary

Installation and Maintenance Data

INSTALLATION

HANDLING

REFRIGERANT PIPING

EVACUATION

CHARGING THE SYSTEM

Instructions for charging the refrigerant into the unit and system.

FIELD WIRING

TYPICAL FIELD WIRING DIAGRAM

Illustrates typical field wiring connections for unit power and controls.

UNIT LAYOUT & PRINCIPLES OF OPERATION

MAJOR COMPONENT LOCATIONS

ELECTRICAL LEGEND

STARTUP AND SHUTDOWN

PRE-STARTUP

Checks to perform before initial unit startup.

INITIAL STARTUP

Steps for starting the unit for the first time.

SYSTEM MAINTENANCE

COMPRESSOR OIL LEVEL

SERVICE

FILTER-DRIERS

LIQUID LINE SOLENOID VALVE

APPENDIX

STANDARD CONTROLS

Details the function and settings of standard safety and operational controls.

HIGH PRESSURE CONTROL

FANTROL HEAD PRESSURE CONTROL

Details the FANTROL system for head pressure and fan speed control.

COMPRESSOR LOCKOUT

COMPRESSOR MOTOR PROTECTOR

OPTIONAL CONTROLS

SPEEDTROL HEAD PRESSURE CONTROL (OPTIONAL)

Modulates fan speed based on head pressure for low ambient operation.

LOW AMBIENT START (OPTIONAL)

ALP CONTROLS, SETTINGS, AND FUNCTIONS

HIGH PRESSURE CONTROL

LOW PRESSURE CONTROL

Used for pumpdown; stops compressor when suction pressure is too low.

TROUBLESHOOTING CHART

COMPRESSOR WILL NOT RUN

COMPRESSOR NOISY OR VIBRATING

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