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CODE
TITLE
The following pre-trip codes perform diagnostic checks on main components of the remote evaporator component
when Code 52 (Cd52) is active. The system must be configured for a Dual Temperature Unit for pre-trip codes to
be activated.
P4-2
Remote Evaporator
Fans On Test
P4-3
Remote Evaporator
Fans Off Test
P5-6
Remote Evaporator
Fan Direction Test
P6-8
Host Liquid Solenoid
Valve (HLSV) Test
P6-9
Remote Liquid
Solenoid Valve
(RLSV) Test
P6-10
Remote Suction
Modulation Valve
(RESMV) Close Test
T-319
Table 3–4 Remote Controller Pre-Trip Test Codes
NOTE
Setup: Evaporator fans start in the OFF condition, current draw is measured,
then evaporator fans will be turned on. After 60 seconds, the current draw is
measured again. The change in current draw is then recorded.
Pass/Fail Criteria: Passes if change in current draw is in specified range.
Setup: Evaporator fans are turned off. After 10 seconds, the current draw is
measured. The change in current draw is then recorded.
Pass/Fail Criteria: Passes if change in current draw is in specified range.
Setup: With evaporator fan running on high speed, turn the heaters on for
30 seconds, then measure the temperature difference between the primary
supply and primary return probes.
Pass/Fail Criteria: Passes if primary supply temperature is 1.0 degrees
higher than primary return temperature. Test P5-0 must pass before this test
is run.
Setup: The system is allowed to run (remote evaporator, condenser and
compressor) for 1 minute with the SMV at 100% and HLSV open. A current
draw test is performed and the values are saved. The HLSV is then closed,
and a 15 second delay follows. A current draw test is again performed and
the values are compared to the original saved values.
Condenser Pressure Control logic should be used for this test if the control-
ler is configured for it. The quench valve, if configured, will operate accord-
ing to normal operating rules.
Pass/Fail Criteria: Passes if current draw drops below acceptable value.
Setup: Once the HLSV pre-trip has completed, open the RLSV and allow
the remote unit to run (remote evaporator, condenser and compressor) for
1 minute with the SMV at 100% and HLSV and host evaporator fans off. A
current draw test is performed and the values are saved. The RLSV is then
closed, and a 15 second delay follows. A current draw test is again per-
formed and the values are compared to the original saved values.
Condenser Pressure Control logic should be used for this test if the control-
ler is configured for it. The quench valve, if configured, will operate accord-
ing to normal operating rules.
Pass/Fail Criteria: Passes if current draw drops below acceptable value.
Setup: Once the RLSV pre-trip has completed, open the RLSV and allow
the remote unit to run (remote evaporator, condenser and compressor) for
1 minute with the SMV at 100% and HLSV and host evaporator fans off. A
current draw test is performed and the values are saved. The RRESMV is
then closed to 1% and a 30 second delay follows. A current draw test is
again performed and the values are compared to the original saved values.
Condenser Pressure Control logic should be used for this test if the control-
ler is configured for it. The quench valve, if configured, will operate accord-
ing to normal operating rules.
Pass/Fail Criteria: Passes if current draw drops below acceptable value.
DESCRIPTION
3–8
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