UNITROL MODEL #8000, 8012
CHILLER
DIAGNOSTICS
6
LOW FREON FAULT:
The Freon pressure in the sealed refrigeration system has
fallen below the setting on the LOW FREON safety switch.
When this switch trips, it is probable that it will start again for a
few seconds, go to fault, etc. This indicates that the Freon level
is low, but that Freon is present. This conditions is caused by a
Freon leak within the sealed system.
Contact a certified refrigeration technician to check the
system, find and repair the leak, and charge it properly.
HIGH FREON FAULT:
The Freon pressure in the sealed refrigeration system has
gone above the setting on the HIGH FREON safety switch.
When this switch trips, the chiller will reset in a few minutes.
This HIGH FREON FAULT can be caused by one of the
following:
DIRTY AIR INTAKE FILTER: If the airflow across the
condenser coil is below a minimum requirement, the ability for
heat to be removed from this coil will be greatly reduced. The
temperature of the Freon in this coil will continue to rise until
the set pressure value has been exceeded. This filter should be
cleaned with soapy water once per week for normal factory
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.
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