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UltraTech
Solenoid
Three Phase
Copeland Scroll
2 Stage Only
Note: Y2 and DC SOL are not applicable for models
543-0038-02 and 943-0038-02.
L Terminal Wiring
The L connection is used to communicate Alert codes to compatible White-Rodgers
thermostats. An icon on the thermostat display will fl ash at the same rate as the Comfort
Alert yellow Alert LED. The L terminal of the thermostat should be connected directly
to the Comfort Alert L terminal. Refer to White-Rodgers thermostat manuals for more
information.
DC SOL Connection
(Not applicable to single stage models 543-0038-02 and 943-0038-02)
The two pin DC SOL connector provides a connection to the Copeland UltraTech
second stage compressor solenoid. This solenoid is internal to the compressor. This
24VDC solenoid will not operate properly if 24VAC is applied to the compressor solenoid
terminals.
To reduce the VA load of the solenoid on the system, Comfort Alert uses a phase control
method to reduce the DC voltage to the solenoid to the minimum level required to keep
the solenoid pulled in. As the 24VAC supply voltage varies, Comfort Alert intelligently
changes the solenoid DC voltage supply to minimize power consumption. A voltmeter
attached to the DC SOL output will measure 4-18VDC, when solenoid should be
energized, depending on the level of the 24VAC supply.
6
COMFORT ALERT
DIAGNOSTICS
MODULE
543-0038-00
T1
T2
T3
Y2
Y
L
R
C
PROT
DC SOL
Figure 6 System Controller Schematic
CC
10 k Ohm Resistor
2 Stage Only
C
I2
O2
SYSTEM CONTROLLER
L1
3 Phase
L2
208-575VAC
50/60Hz
L3
HPCO
LPCO
Optional
R
I1
O1
I1, I2 = Controller Inputs
O1, O2 = Controller Outputs
R, C = Controller Power
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