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Test 8 - Evaporator Fan Motor Amperage
Check
The evaporator motor contactor is energized and
check for proper current draw. An alarm will be dis-
played if the fan motors test outside the current range
(amps).
Test 9 - Condenser Fan Motors Amperage
Check
The condenser motor contactor is energized and
check for proper current draw. An alarm will be dis-
played if fan motors test outside the current range
(amps).
Test 10 - Check Compressor Suction Modula-
tion Valve (CSMV)
This test ensures that the CSMV is opening and clos-
ing properly. If suction pressure doesn’t change as
expected with CSMV closed then "CHECK SUCTION
MOD VALVE" alarm will be displayed and Pretrip is
aborted. This test may take several minutes.
Test 11 - Electronic Expansion Valve (EVXV)
This test checks the operation of the EVXV. If valve
doesn’t test properly "CHECK EVAP SUPERHEAT"
alarm will be displayed.
NOTE
Tests 12, 13 & 14 may be display only on Field
Trial Units, depending on software revision.
Test 12 - Unloader Solenoid Valve (USV)
This test checks the operation of the unloader solenoid
valve. If suction pressure does not change when USV
is de-energized, the "CHECK BYPASS" alarm will be
displayed.
Test 13 - Economizer Solenoid Valve (ESV)
This test checks the operation of the economizer sole-
noid valve. If discharge pressure does not change
when ESV is energized, the "CHECK ECONOMIZER"
alarm will be displayed.
Test 14 - Liquid Injection Solenoid Valve (LIV)
This test checks the operation of the liquid injection
solenoid valve. If compressor suction temperature
does not change when LIV is energized, the "CHECK
LIV" alarm will be displayed.
Test 15 - Check For Other Alarms
Checks the current alarm list for other active alarms.
Pretrip Termination
When the Pretrip cycle is completed, the unit will
return to normal temperature control operation.
"PRETRIP PASS" will be displayed in the Message-
Center until the operator presses any key. In the event
that the Pretrip test triggered an alarm(s), the
MessageCenter will display either "PRETRIP FAIL &
COMPLETE" (if the entire Pretrip cycle was complet-
ed), or "PRETRIP FAIL IN TEST XX", (if the Pretrip
cycle was aborted by an alarm before it was complet-
ed).
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