Carrier VECTOR 6500 Operation & Service Manual page 144

Alarm
Steps
NO.
17 HIGH COMP DISCHARGE TEMP
•
TRIGGER–ON: Discharge sensor alarm not active AND:
Ambient temp below 120°F (48.9°C) and discharge temp was between 310 and - 349°F
(154.4 to - 176.7°C) for 3 minutes, or
Ambient temp above 120°F (48.9°C) and discharge temp was between 340 and - 349°F
(171.1 and - 176.7°C) for 3 minutes, or
Discharge temp ever reaches 350°F (176.7°C.)
•
UNIT CONTROL:
•
RESET CONDITION: Auto Reset after 15 minutes with Ambient temp below 120°F (48.9°C) the
discharge temp falls below 300°F (148.8°C), or Auto Reset after 15 minutes with Ambient temp
above 120°F (48.9°C) the discharge temp falls below 330°F (165.4°C), 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 For Bad Compressor Discharge Temperature Sensor
Check for Alarm 125.
2 Check Refrigerant Charge
Check for undercharged system.
3 Check Airflow Through Condenser Coil
a. Inspect condenser & radiator.
b. Check airflow (with unit running).
4 Check CSMV
Check
modulation valve.
5 Check System Pressures
Install manifold gauge set and check
and compare compressor discharge
& suction pressures with those
shown on the microprocessor dis-
play.
6 Perform Pretrip Check
Clear Active Alarm list, then run Pre-
trip & check for any new alarms.
7 Check Compressor Reed Valves & Gaskets
Remove compressor heads & in-
spect condition of all reeds & gas-
kets.
8 Check Expansion Valve (EVXV)
Check operation of valve.
9 Check System For Non-Condensables
Check refrigeration system for non-
condensable gas(es).
Alarm/Cause
Engine Operation: engine and unit shutdown and alarm.
Standby Operation: refrigeration system shutdown and alarm with PSCON
still energized.
compressor suction
7−11
Corrective Action
Alarm conditions must be corrected and the alarm
cleared to continue.
Refer to Section 8.6.2.
Ninety percent or more of the coil surface must be
undamaged. No "dead" air spaces. Condenser coil
and radiator must be clean.
Even airflow through the entire coil
No "dead" spots
Refer to Section 8.8.5.
Suction & Discharge Pressures must have the same
reading on gauges & on microprocessor display.
NOTE: Microprocessor suction (CSP) and evaporator
(EVOP) pressure readings have a maximum value of
100 psig (7.5 bar) The actual suction pressure must
be lower than 100 psig in order to perform this test.
Any active alarms must be corrected and cleared
before proceeding.
Must be in good condition. Install new parts and gas-
kets as required.
Refer to Section 8.8.6
No non–condensable gas(es) may be present. (Refer
to Section 8.6.2.)
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