7−86
62-11389
Alarm
NO.
Steps Alarm/Cause Corrective Action
P180 CHECK SUCTION MOD VALVE
• TRIGGER–ON: With the unit running in Pretrip Test #11, after the microprocessor attempts to close
CSMV, the suction pressure fails to drop below 4in. Hg (-0.14 bar.)
• UNIT CONTROL: Engine and Standby Operation: Pretrip will fail and display
“PRETRIP FAIL IN TEST 11”.
• RESET CONDITION: Auto Reset if Pretrip is started again or alarm may be manually reset via
keypad or by turning the unit off then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, clear the
alarm(s). (See Note 1 page 7−2.) Operate the unit through the appropriate modes to see if any active alarm
occurs. Continue with the steps below as necessary.
1 Check Software Revision Level
Upgrade software. Install (or have Carrier Transicold dealer install) latest
revision.
2 Check wiring to DPT & SPT
a. Verify that correct wires are con-
nected to each transducer.
Plugs to transducers are the same. The correct wire
plug must be connected to the proper transducer.
b. Verify that correct transducer is be-
ing used in each position.
Mechanical connections to transducers are the
same.
The Discharge Transducer should have a RED mark-
ing dot on it.
The Suction Transducer should have a BLUE mark-
ing dot on it.
3 Check Compressor Operation
Check compressor operation. Refer to Section 8.7.1.
If compressor does not pass all tests, repair or re-
place compressor.
4 Check Suction Modulating Valve
a. Visually inspect CSMV. No damage to valve.
b. Inspect CSMV coil and wire con-
nections. Refer to Section 8.8.5.
No damage to coil.
No damage, moisture, or corrosion in connector.
c. Check CSMV operation. Refer to
Section 8.8.5.
Must perform correctly.
d. Check wires from CSMV to micro-
processor.
No visual damage to wires
Continuity test verifies that each wire is good.
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