Carrier VECTOR 6500 Operation & Service Manual page 153

Alarm
Steps
NO.
27 HIGH SUCTION PRESSURE
•
TRIGGER ON: The refrigeration system is running and the suction pressure has been greater than
98 psig (6.7 bar) for more than 10 minutes.
•
UNIT CONTROL:
•
RESET CONDITION: Auto reset when suction pressure is less than 75 psig (5.1 bar) for 5 minutes
and configured for Alarm Only, or Auto Reset after 15 minutes if configured as a Shutdown Alarm
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, the active
alarm should clear itself (see reset condition above). Operate the unit through the appropriate modes to see if
any active alarm occurs. Continue with the steps below as necessary.
1 Check System Pressures
Install manifold gauge set and check
and compare compressor discharge
& suction pressures with those
shown on the microprocessor dis-
play.
2 Check For Refrigerant Overcharge
Check refrigerant level in the receiv-
er.
3
Perform Pretrip Check
Clear Active Alarm list, then run Pre-
trip & check for any new alarms.
4 Check EVXV
a. Check wiring and connections to
EVXV.
b. Check operation of EVXV.
5 Check Compressor.
a. Perform Pump-Down Test.
Refer to Section 8.7.1
b. Cover condenser and build-up
discharge pressure.
c. Disassemble and inspect
compressor valve plates, reeds,
pistons, etc.
62-11389
Alarm/Cause
Engine Operation: alarm only or (if configured for shutdown) engine and
unit shutdown and alarm.
Standby Operation: alarm only or (if configured for shutdown) refrigeration
system shutdown and alarm with PSCON still energized.
7−20
Corrective Action
Suction pressure must be above 3 psig (0.2 bar.)
Suction & Discharge Pressures must have the same
reading on gauges & on microprocessor display.
NOTE: Microprocessor suction (CSP) and evap-
orator (EVOP) pressure readings have a maxi-
mum value of 100 psig (7.5 bar) The actual suc-
tion pressure must be lower than 100 psig in or-
der to perform this test.
Refer to Section 8.6.2.
Any active alarms must be corrected and cleared be-
fore proceeding.
No physical damage to harness. No damage or
corrosion in connectors. Connector tight on valve.
Refer to Section 8.8.6.
Must hold a vacuum and not equalize in a short peri-
od of time
Must be able to pump up to 400 psig (27.2 bar.)
Must be intact, clean, and in good working order.