Low Water Level Fault - Unitrol 8400 Manual

TROUBLE SHOOTING
UNITROL MODEL 8400, 8401, 8406, 8450, 8451, 8456
conditions, or more frequently for factories that have a large dust or grinding dust content in the
air.
DIRTY CONDENSER COILS: If dirt has been trapped on the surfaces of the condenser coil's
fins, the ability for these surfaces to transfer air to the passing air stream will be greatly reduced.
See the maintenance section for coil cleaning directions.
LOW AIR FLOW ACROSS THE CONDENSER CAUSED BY INSTALLATION OF CHILLER
TOO CLOSE TO A WALL: If the air intake (air intake filter) is less than 36" from a wall, or the
air exhaust grill on the back of the chiller is less than 36" from a wall, air flow will be restricted
and will reduce the ability of this air to remove heat from the condenser coil. The chiller has to
be moved to eliminate this problem.
USE OF AN INTAKE AIR FILTER DURING EXTREMELY HOT DAYS: If the room temperature
exceeds 90ºF, it is possible that the small reduction caused by even a clean intake air filter will
cause the system to overheat and trip the HIGH FREON safety switch. Remove the air filter and
replace it when air temperature falls below 90ºF.
THE NEED FOR MORE AIR FLOW OVER THE CONDENSER COIL: In extreme cases of high
room temperature and restricted air flow around the chiller, it might be necessary to use an
additional fan to force air across the condenser coil. This can be done using a commercial fan
blowing air into the front of the coil (where air filter is located), or by installing a factory fan
booster kit. Consult the Unitrol service department on this.
WATER LEVEL LOW:
Glows when the water level in the tank drops below the water float switch. The water pump and
compressors will turn off when this fault is detected.
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