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
59
If more than two heater elements are on
sequencer, HR2,which will control the 3rd and 4th
the temperature indoors will continue to drop. The
remove the 24Vac from HR2. The contacts on HR2 will
2.3 When the “W1” heat demand is satised, the room
thermostat will remove the 24Vac from HR1. Both set of
contacts on the relay opens within 30 to 70 seconds and
turn o the heater element(s) and the blower motor.
MBR/AR*F With Single Stage Heat Pumps
3.0 Cooling Operation
On heat pump units, when the room thermostat set to the
cooling mode, 24Vac is supplied to “O” which energizes
the reversing valve. As long as the thermostat is set for
cooling, the reversing valve will be in the energized position
for cooling.
3.1 On a demand for cooling, the room thermostat
energizes “G” and “Y” and 24Vac is supplied to “Y” at the
heat pump and the “G” terminal on the EBTDR board.
3.2 The heat pump turned on in the cooling mode and after
a 7 second on delay, the relay on the EBTDR board is
energized and the blower motor starts.
3.3 When the cooling demand is satised, the room
thermostat removes the 24Vac from “G” and “Y”.
3.4 The heat pump is turned o and after a 65 second
delay o, the relay on the EBTDR board is de-energized
and the blower motor is turned o.
4.0 Heating Operation
On heat pump units, when the room thermostat set to the
heating mode, the reversing valve is not energized. As
long as the thermostat is set for heating, the reversing
valve will be in the de-energized position for heating except
during a defrost cycle. Some installations may use one or
more outdoor thermostats to restrict the amount of electric
heat that is available above a preset ambient temperature.
Use of optional controls such as these can change
the operation of the electric heaters during the heating
mode. This sequenceof operation does not cover those
applications.
4.1 On a demand for rst stage heat with heat pump units,
the room thermostat energizes “G” and “Y” and 24Vac is
supplied to “Y” at the heat pump unit and the “G” terminal
on the EBTDR board. The heat pump is turned on in the
heating mode and the blower motor starts after a 7 second
on delay.
4.2 If the rst stage heat demand cannot be satised by
the heat pump, the temperature indoors will continue to
drop. The room thermostat will then energize terminal “W2’
for second stage heat and 24Vac will be supplied to heat
sequencer HR1 on the heater assembly.
4.3 HR1 contacts M1 and M2 will close will close within 10
to 20 seconds and turn on heater element #1. 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 and turn on heater element #2. The
blower motor is already on as a result of terminal “G” on
the EBTDR board being energized for the rst stage heat
demand.
If more than two heater elements are on
sequencer, HR2, which will control the 3rd and 4th
the temperature indoors will continue to drop. The
remove the 24Vac from HR2. The contacts on HR2 will
4.4 As the temperature indoors increase, it will reach
a point where the second stage heat demand, “W2”, is
satised. When this happens, the room thermostat will
remove the 24Vac from the coil of HR1. The contacts on
HR1 will open between 30 to 70 seconds and turn o both
heater element(s). The heat pump remains on along with
the blower motor because the “Y” demand for rst stage
heat will still be present.
4.5 When the rst stage heat demand “Y” is satised, the
room thermostat will remove the 24Vac from “G” and “Y”.
The heat pump is turned o and the blower motor turns o
after a 65 second o delay.
5.0 Defrost Operation
On heat pump units, when the room thermostat is set to
the heating mode, the reversing valve is not energized.