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
SYSTEM OPERATION
58
Operation
Most expansion valves used in current Amana Heat Pump products use an internally checked expansion valve. This type
of expansion valve does not require an external check valve as shown above.
In the cooling mode, the orice is pushed into its seat,
forcing refrigerant to ow through the metered hole in the
center of the orice.
Operation
In the heating mode, the orice moves back o its seat
allowing refrigerant to ow unmetered around the outside
of the orice.
SEQUENCE OF OPERATION
Refer to the installation instructions and wiring
MBR/AR*F With Single Stage Condensers
1.0 Cooling Operation
1.1 On a demand for cooling, the room thermostat
energizes “G” and “Y” and 24Vac is supplied to “Y” at the
condensing unit and the “G” terminal on the EBTDR board.
1.2 The compressor and condenser fan are turned on and
after a 7 second on delay, the relay on the EBTDR board is
energized and the blower motor starts.
1.3 When the cooling demand “Y” is satised, the room
thermostat removes the 24Vac from “G” and “Y”.
1.4 The compressor and condenser fan are turned o and
after a 65 second delay o, the relay on the EBTDR board
is de-energized and the blower is turned o.
2.0 Heating Operation
2.1 On a demand for heat, the room thermostat energizes
“W1” and 24Vac is supplied to heat sequencer, HR1, on the
heater assembly.
2.2 The contacts M1 and M2 will close within 10 to 20
seconds and turn on heater element #1. The normally
closed contacts on the EBTDR are also connected to
terminal M1. When M1 and M2 close, the blower motor
will be energized thru the normally closed contacts on the
EBTDR board. At the same time, if the heater assembly
contains a second heater element, HR1 will contain a
second set of contacts, M3 and M4, which will close to turn
on heater element #2.