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
89
1. When operating properly the valve contains refrigerant
gases at certain temperatures.
2. The discharge line should be the same temperature after
the valves discharge line.
3. The true suction should be the same as the suction line
after the valve. If there is a 4-degree dierence, valve is
leaking
When stuck in the mid-position, part of the discharge gas
from the compressor is directed back to the suction side,
resulting in excessively high suction pressure. An increase
in the suction line temperature through the reversing valve
can also be measured. Check operation of the valve
by starting the system and switching the operation from
COOLING to HEATING cycle.
If the valve fails to change its position, test the voltage
(24V) at the valve coil terminals, while the system is on the
COOLING cycle.
All heat pumps and communicating heat pumps wired
in legacy - If no voltage is registered at the coil terminals,
check the operation of the thermostat and the continuity
of the connecting wiring from the “O” terminal of the
thermostat to the unit.
Communicating heat pumps only - Check voltage
(24VAC) at the non-insulated terminal E22 on the UC
control board (RVS on silkscreen) and “C” terminal on the
7-pin or 4-pin connector on the UC control
If voltage is registered at the coil, tap the valve body lightly
while switching the system from HEATING to COOLING,
etc. If this fails to cause the valve to switch positions,
remove the coil connector cap and test the continuity of
the reversing valve solenoid coil. If the coil does not test
continuous - replace it.
If the coil test continuous and 24 volts is present at the coil
terminals, the valve is inoperative - replace it.
Testing Defrost Control
To check the defrost control for proper sequencing,
proceed as follows: With power ON; unit not running.
1. Jumper defrost thermostat by placing a jumper wire across
the terminals “DFT” and “R”/”R-DFT” at defrost control
board.
2. Connect jumper across test pins on defrost control board.
3. Set thermostat to call for heating. System should go into
defrost within 21 seconds.
4. Immediately remove jumper from test pins.
5. Using VOM check for voltage across terminals “C & O”.
Meter should read 24 volts.
6. Using VOM check for voltage across fan terminals DF1
and DF2 on the board. You should read line voltage (208-
230 VAC) indicating the relay is open in the defrost mode.
7. Using VOM check for voltage across “W”/”W2” & “C”
terminals on the board. You should read 24 volts.
8. If not as above, replace control board.
9. Set thermostat to o position and disconnect power before
removing any jumpers or wires.
Testing Defrost Thermostat
1. Install a thermocouple type temperature test lead on the
tube adjacent to the defrost control. Insulate the lead
point of contact.
2. Check the temperature at which the control closes its
contacts by lowering the temperature of the control. Part #
0130M00009P which is used on 2 and 2.5 ton units should
close at 34°F ± 5°F. Part # 0130M00001P or B1370803
which is used on 3 thru 5 ton units should close at 31°F
± 3°F.
3. Check the temperature at which the control closes its
contacts by lowering the temperature of the control. Part
# 0130M00085, which is used onunits with 5 mm coils,
should close at 30°F ± 5°F.
4. Check the temperature at which the control opens its
contacts by raising the temperature of the control. Part
#0130M00009P which is used on 2 and 2.5 ton units should
open at 60°F ± 5°F. Part # 0130M00001P or B1370803
which is used on 3 thru 5 ton units should open at 75°F
± 6°F.
5. Check the temperature at which the control opens its
contacts by raising the temperature of the control. Part
# 0130M00085, which is used on units with 5 mm coils,
should open at 60°F ± 5°F.
6. If not as above, replace control.
Each individual heater element is protected with an
automatic rest limit control connected in series with each
element to prevent overheating of components in case
of low airow. This limit control will open its circuit at
approximately 150°F. to 160°F and close at approximately
110°F.
WARNING