10
See Table 4
See Table 2
See Table 1
Test Point
Common
J3
J8
T2
T5
J4
24VAC to SHR-1 for
sump heat
Low Pressure Cut Out
0 VAC = Closed
24 VAC = Open
(pin to pin)
J6 J7
See Table 3
J9
DCV Test
Point (+VP)
See Table 5
CONTROL BOARD TEST POINTS
Test DC voltages at the locations shown below. Corresponding tables show proper values or ranges.
Sump Heat ON At power up (10 hours max) if compressors remain OFF
Sump Heat OFF When a compressor is running
Sump Heat OFF For 30 minutes after compressor(s) have stopped running
Sump Heat OFF
When outdoor temperature goes above 85'F (sump heat remains off
down to 75'F)
Note: The system is designed so that a compressor and sump heat will not run at the same time
Sump Heat Control - T2
TABLE 2
Cooling & Heating Speed Volts DC at plug J3-PWM (to test point common)
Low Stage 5 to 7
High Stage 7.5 to 10
Defrost Soft-Switchover 0.5
TABLE 1
20 SEER Outdoor ECM Fan Control Signals
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