ASPT Service Manual
Table Of Contents
- IMPORTANT INFORMATION
- PRODUCT IDENTIFICATION
- Checking Voltage
- Checking Wiring
- Checking Thermostat And Wiring
- Thermostat Wiring
- Checking Transformer And Control Circuit
- Checking Contactor And/Or Relays
- Checking Contactor Contacts
- Checking Fan Relay Contacts
- Checking Loss Of Charge Protector (Heat Pump Models)
- Checking High Pressure Control
- Checking Low Pressure Control
- Copeland Comfort Alert™ Diagnostics - 3-Wire module
- Copeland Coresense™ Diagnostics - 3-Wire module
- Checking Capacitor
- Resistance Check Using A Digital Multi-Meter
- Capacitance Check Using A Digital Multi-Meter (In Capacitance Mode)
- Testing a Run Capacitor Under Load
- Checking Outdoor Fan and Blower Motors (PSC Motors)
- Checking Fan and Blower Motor (ECM Motors)
- Checking ECM Motor Windings
- ECM CFM Adjustments MBE/AEPF
- Blower Performance Data
- Checking High Efficiency Motors
- EEM Blower Replacement
- MBR/AR*F Electronic Blower Time Delay Relay
- Checking Compressor
- Resistance Test
- Ground Test
- Unloader Test Procedure
- Operation Test
- Checking 3-Phase Scroll Compressor Rotation
- Testing Crankcase Heater (Optional Item)
- Checking Reversing Valve and Solenoid
- Testing Defrost Control
- Testing Defrost Thermostat
- Checking Heater Limit Control(s)
- Checking Heater Elements
- Electric Heater (Optional Item)
- Checking Heater Limit Control(s)
- Checking Heater Elements
- Refrigeration Repair Practice
- Leak Testing (Nitrogen or Nitrogen-Traced)
- Evacuation
- Charging
- Checking Compressor Efficiency
- Overfeeding
- Underfeeding
- Checking Superheat
- Subcooling on Expansion Valve System
- Checking Expansion Valve Operation
- Checking Restricted Liquid Line
- Overcharge Of Refrigerant
- Non-Condensables
- Compressor Burnout
- Refrigerant Piping
- Duct Static Pressures
- Single Piece Air Handler External Static
- Two Piece Air Handler External Static Pressure
- Furnace External Static Pressure
- Periodic Maintenance
SERVICING
69
WARNING
4. The measured voltage between circuit 3 and circuits
2 or 1 should be approximately 0VAC, which indicates
the relay contacts are closed. A voltage measurement
of approximately 115VAC indicates the relay is open.
Replace the control if the relay checks open when it should
be closed. See notes and cautions below.
fan motoR disconnected will cause the high pressure
switch to trip.
The loss of charge protectors senses the pressure in the
liquid line and will open its contacts on a drop in pressure.
the low pressure control will automatically reset itself with a
rise in pressure.
The low pressure control is designed to cut-out (open) at
approximately 21 PSIG. It will automatically cut-in (close)
at approximately 50 PSIG.Test for continuity using a VOM
and if not as above, replace the control.
WARNING
The high pressure control capillary senses the pressure
in the compressor discharge line. If abnormally high
condensing pressures develop, the contacts of the control
open, breaking the control circuit before the compressor
motor overloads. This control is automatically reset.
Test 1. Testing High Pressure Control in Cooling Mode
1. Connect refrigerant gages to unit.
2. Disconnect power to outdoor unit.
3. Remove control panel cover.
4. Disconnect black wire from condenser fan motor (single
stage units) or remove plug from control board on 2 stage
units. Note: Tape or isolate black wire to prevent possible
short.
5. Apply power to unit and set thermostat to cool and set for
all for cool.
6. High pressure switch should open at 610 PSIG +/- 10 PSIG
and close at 420 PSIG +/- 25 PSIG
7. If high pressure switch does not operate in these
parameters replace switch.
Test 2. Testing High Pressure Control in Heating Mode
1. Connect refrigerant gages to unit.
2. Disconnect power to indoor unit.
3. Remove control panel cover.
4. Disconnect black wire from evaporator fan motor (single
stage units) or remove plug from control board on 2 stage
units. Note: Tape or isolate black wire to prevent possible
short.
5. Apply power to unit and set thermostat to heat and set
for call for heat.
6. High pressure switch should open at 610 PSIG +/- 10 PSIG
and close at 420 PSIG +/- 25 PSIG
7. If high pressure switch does not operate in these
parameters replace switch.
With power ON:
WARNING
The low pressure control senses the pressure in the
suction line and will open its contacts on a drop in
pressure. The low pressure control will automatically reset
itself with a rise in pressure.
Test 1. Testing Low Pressure Control in Cooling Mode
1. Connect refrigerant gages to unit.
2. Disconnect power to indoor unit.
3. Remove control panel cover.
4. Disconnect black wire from evaporator fan motor (single
stage units) or remove plug from control board on 2 stage
units. Note: Tape or isolate black wire to prevent possible
short.