00012 High Coolant Temperature - Carrier X4 7300 Operation & Service Manual

00012 HIGH COOLANT TEMPERATURE
• ACTIVATION:
Condition 1: Ambient temperature is below 120°F (48.9°C) and engine coolant temperature is above
230°F (110°C).
Condition 2: Ambient temperature is above 120°F (48.9°C) and, engine coolant temp is above 241°F
(116°C).
Condition 3: Ambient temperature is below 120°F (48.9°C) and the engine coolant temperature has
remained between 230 and 241°F (110 and 116°C) for more than 5 minutes.
• UNIT CONTROL: Shutdown and alarm.
• RESET CONDITION: Auto reset after 15 minutes if the engine coolant temp falls below 212°F (100°C), or
alarm may be manually reset using the display mounted keys or by turning the unit off and 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 (refer to reset condition above). Operate the unit through the appropriate modes to see if
any active alarm occurs.
CORRECTIVE ACTIONS:
1. Check Coolant Level
Do not remove the cap from a hot coolant system. If the cap must be removed, do so very
slowly in order to release the pressure without spray.
a. Check coolant level in overflow bottle. Level must be in the normal range.
b. Inspect connecting tube between overflow bottle and radiator. Connections must be airtight. No
leakage or holes in tube.
2. Check Engine Coolant Temperature Sensor (ENCT)
a. Refer to procedure for alarm
corrected and the alarm cleared to continue.
3. Check Freeze Point Of Coolant
Use Coolant Tester to check concentration of anti-freeze mixture. Must be between 40% to 60% Eth-
ylene Glycol to water mixture.
4. Check Water Pump / Alternator Belt
Check belt condition. Verify no Glazing, no Cracking, no Slipping. Replace belt if required. Refer to
Section 8.5.15.
5. Check Airflow Through Radiator & Condenser Coil
a. Inspect condenser & radiator. Ninety percent or more of the coil surface must be undamaged. Con-
denser/Radiator coil must be clean.
b. Check airflow (with unit running). Verify even airflow through the entire coil and no "dead" spots.
c. Check upper and lower fan belt tension & condition. Verify no glazing, cracking, or slipping. Replace
if required. Refer to
WARNING
!
00129 CHECK ENG COOLANT
Section 8.6.
SENSOR. Alarm condition must be
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