SERVICING
70
5. Apply power to unit and set thermostat to cool and set for
a call for cool.
6. Low pressure switch should open at 21 PSIG, and auto
reset (close) at approximately 50 PSIG.
7. If low pressure switch does not operate in these parameters
replace switch.
Test 2. Testing Low Pressure Control in Heating 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. Low pressure switch should open at 21 PSIG and auto
reset (close) at approximately 50 PSIG
7. If low pressure switch does not operate in these parameters
replace switch.
Copeland Comfort Alert™
Diagnostics - 3-Wire module
Applies to ASX /ASZ and DSX/DSZ units
WARNING
High Voltage!
Disconnect all power before servicing
or installing. Multiple power sources
may be present. Failure to do so may
cause property damage, personal injury
or death.
Comfort Alert™ is self-contained with no required external
sensors and is designed to install directly into the electrical
box of any residential condensing unit that has a Copeland
Scroll™ compressor inside.
Once attached, Comfort Alert provides around-the-clock
monitoring for common electrical problems, compressor
defects and broad system faults. If a glitch is detected, an
LED indicator flashes the proper alert codes to help you
quickly pinpoint the problem.
(See Diagnostic Table: 3-Wire
Comfort Alert Module on previous page.)
Schematic Abbreviation Descriptions
HTCO High Temperature Cut Out Switch
HPCO High Pressure Cut Out Switch
LPCO Low Pressure Cut Out Switch
CC Compressor Contactor
ECB Electronic Control Board
(Defrost or Time Delay)
ECB
CC
HTCO LPCO
HPCO
Comfort Alert
Diagnostics Module
Bold line shows field
installed wiring
Dashed line shows thermostat
demand wiring in system without
HTCO, HPCO, CPCO, and ECB
LOGIC
R
C
Y
Y1
R
C
Wiring Schematic - 3-Wire Comfort Alert Module
Copeland Coresense™ Diagnostics - 3-Wire module
Applies to ASX /ASZ and DSX/DSZ units
WARNING
High Voltage!
Disconnect all power before servicing
or installing. Multiple power sources
may be present. Failure to do so may
cause property damage, personal injury
or death.
The CoreSense™ module is self-contained with no
required external sensors and works with any residential
condensing unit that has a Copeland Scroll™ compressor
inside.
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