Trane IntelliPak CGAF Series - Page 49

49
System Testing & Troubleshooting
DIAGNOSTIC DISPLAYED REASON FOR DIAGNOSTIC UCM’S REACTION RESET REQUIRED
Circuit 1 Pumpdown Terminated by Time Problem: Unit went through Pumpdown on Circuit 1 and LPC never tripped. Pumpdown was terminated after 30 seconds. Check: Check circuit 1 pumpdown solenoid valve and low pressure switch to verif
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Unit remained in pumpdown for 30 seconds without the occurrence of an LPC event. Pumpdown sequence was terminated by a 30 second timer.
No Change in unit operation occurs. This diagnostic is for information only.
(INFO) This diagnostic is reset when a compressor on Circuit 1 is staged on due to a cooling demand.
Crcuit 2 Pumpdown Terminated by Time (Circuit #2 40-60 Ton units only) Problem: Unit went through Pumpdown on Circuit 2 and LPC never tripped. Pumpdown was terminated after 30 seconds. Check: Check circuit 2 pumpdown solenoid valve and low pressure switch to verif
y
p
ro
p
er o
p
eration.
Unit remained in pumpdown for 30 seconds without the occurrence of an LPC event. Pumpdown sequence was terminated by a 30 second timer.
No Change in unit operation occurs. This diagnostic is for information only.
(INFO) This diagnostic is reset when a compressor on Circuit 2 is staged on due to a cooling demand.
Compressor Contactor Fail - Circuit 1 Problem: The Compressor Contactor for Circuit #1 has malfunctioned.
The circuit #1 compressor proving input on the SCM/MCM is detected closed continuously for more than 3 seconds while neither compressor output on Circuit #1 is closed.
A "Lockout Circuit #1" request is issued to the Compressor Staging Control function. The Compressor Relays, LPC Bypass Relay, Liquid Line Solenoid Relay, and Hot Gas Bypass Relay for Circuit 1 are all de-energized
(PMR) A manual reset is required after the diagnostic is set. It can be reset by the HI or Tracer, or by cycling power to the CGM.
Compressor Contactor Fail - Circuit 2 (Circuit #2 40-60 Ton units only) Problem: The Compressor Contactor for Circuit #2 has malfunctioned.
The Circuit #2 compressor proving input on the MCM is detected closed continuously for more than 3 seconds while neither compressor output on Circuit #2 is closed.
A "Lockout Circuit #2" request is issued to the Compressor Staging Control function. The Compressor Relays, LPC Bypass Relay, and Liquid Line Solenoid Relay for Circuit 2 are all de-energized
PMR) A manual reset is required after the diagnostic is set. It can be reset by the HI or Tracer, or by cycling power to the CGM.