Carrier VECTOR 6500 Operation & Service Manual page 219

Alarm
Steps
NO.
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:
•
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.
2 Check wiring to DPT & SPT
a. Verify that correct wires are con-
nected to each transducer.
b. Verify that correct transducer is be-
ing used in each position.
3 Check Compressor Operation
Check compressor operation.
4 Check Suction Modulating Valve
a. Visually inspect CSMV.
b. Inspect CSMV coil and wire con-
nections. Refer to Section 8.8.5.
c. Check CSMV operation. Refer to
Section 8.8.5.
d. Check wires from CSMV to micro-
processor.
62-11389
Alarm/Cause
Engine and Standby Operation: Pretrip will fail and display
"PRETRIP FAIL IN TEST 11".
7−86
Corrective Action
Install (or have Carrier Transicold dealer install) latest
revision.
Plugs to transducers are the same. The correct wire
plug must be connected to the proper transducer.
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.
Refer to Section 8.7.1.
If compressor does not pass all tests, repair or re-
place compressor.
No damage to valve.
No damage to coil.
No damage, moisture, or corrosion in connector.
Must perform correctly.
No visual damage to wires
Continuity test verifies that each wire is good.