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
85
9. Remove the bolts holding the motor bracket to the
blower and slide out of blower shell.
10. Replace the motor and reinstall blower and control box.
11. Reconnect power and test operation.
MBR/AR*F Electronic Blower Time Delay Relay
The MBR/AR*F contains an Electronic Blower Time Delay
Relay board, B1370735. This board provides on/o time
delays for the blower motor in cooling and heat pump
heating demands when “G” is energized.
During a cooling or heat pump heating demand, 24Vac is
supplied to terminal “G” of the EBTDR to turn on the blower
motor. The EBTDR initiates a 7 second delay on and then
energizes it’s onboard relay. The relay on the EBTDR
board closes it’s normally open contacts and supplies
power to the blower motor. When the “G” input is removed,
the EBTDR initiates a 65 second delay o. When the 65
seconds delay expires the onboard relay is de-energized
and it’s contacts open and remove power from the blower
motor.
During an electric heat only demand, “W1” is energized but
“G” is not. The blower motor is connected to the normally
closed contacts of the relay on the EBTDR board. The
other side of this set of contacts is connected to the heat
sequencer on the heater assembly that provides power
to the rst heater element. When “W1” is energized, the
sequencer will close it’s contacts within 10 to 20 seconds to
supply power to the rst heater element and to the blower
motor through the normally closed contacts on the relay
on the EBTDR. When the “W1” demand is removed, the
sequencer opens it contacts within 30 to 70 seconds and
removes power from the heater element and the blower
motor.
The EBTDR also contains a speedup terminal to reduce
the delays during troubleshooting of the unit. When this
terminal is shorted to the common terminal, “C”, on the
EBTDR board, the delay ON time is reduced to 3 seconds
and the delay OFF time is reduced to 5 second.
Two additional terminals, M1 and M2, are on the EBTDR
board. These terminals are used to connect the unused
leads from the blower motor and have no aect on the
board’s operation.
WARNING
If the compressor terminal PROTECTIVE COVER and
gasket (if required) are not properly in place and secured,
there is a remote possibility if a terminal vents, that the
vaporous and liquid discharge can be ignited, spouting
ames several feet, causing potentially severe or fatal
injury to anyone in its path.
This discharge can be ignited external to the compressor
if the terminal cover is not properly in place and if the
discharge impinges on a sucient heat source.
Ignition of the discharge can also occur at the venting
terminal or inside the compressor, if there is sucient
contaminant air present in the system and an electrical arc
occurs as the terminal vents.