Trane R Series Diagnostic Troubleshooting Repair page 76

Table 22 Compressor Module Normal Terminal Voltages (1 U4 and 1 U5)
Terminal Description
Designation of Circuit
J7-8,9 Step Load Solenoid
J7-1, E7 Slide Valve Open
(Load Solenoid) Output
J7-1, E8 Slide Valve Close
(Unload Solenoid) Output
J8-1, 3 Fan Relay 1 Output
J8-1, 4 Fan Relay 2 Output
J8-1, 5 Fan Relay 3 Output
J8-1, 6 Fan Relay 4 Output
J9-6, 5 Variable Frequency
Fan Output PWM
J9-4, 3 Variable Frequency
Fan Fault Signal
J9-2, 1 Not Used
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Module Power and Miscellaneous I/O
Normal Terminal Voltages
for Various Conditions
Normally open contact, closes to energize the Step Load Solenoid Valve.
Triac Output, Refer to Checkout Procedure for MCSP Load/Unload
Outputs.
Triac Output, Refer to Checkout Procedure for MCSP Load/Unload
Outputs.
Normally open contact for Variable Speed Fan contactor control.
Normally open contact for fan contactor(s) control.
Same as above.
Same as above.
10 Volt Peak, 10 Hz fundamental. Its average value can be read with a DC
voltmeter. Refer to Section 11 Variable Speed Fan System Trouble-
shooting.
Fault: 11 V (connector plugged on)
No Fault: 0 VDC (connector plugged on)
Refer to Section 11 Variable Speed Fan System Troubleshooting.
N/A
RLC-SVD03A-EN