ClimaCool IOM AR2 SERIES - Manual (Page 77)

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Troubleshooting Guide
COMPRESSOR CYCLES ON HIGH PRESSURE CONTROL
Possible Cause Remedy
1 . Compressor discharge valve partially closed 1 . Open valve fully
2 . Non-condensable gases in hydronic system 2 . Purge non-condensable gases from bleed valve on condenser or at bleed
valve of the building condenser water system
3 . Overcharge of refrigerant (R-22 or R-407C) 3 . Purge refrigerant from system while in operation until the first sign of
bubbles are shown in sight glass . Add back refrigerant just until bubbles clear .
4 . Air temp entering condenser too high 4 .
5 . Insufficient air flow thru condenser 5 . Check fan blade operation and condenser for debris
6 . Fouled air cooled condenser entering face 6 . Clean entering face of air cooled condenser
7 . Defective high pressure switch 7 . Replace
8 . Non-condensable gases in refrigerant 2 . Purge refrigerant from system, properly evacuate, recharge with new
refrigerant
CAUSES AND PREVENTION OF FREEZE-UP
Possible Cause Prevention
1 . Improper charging 1 . Charge per manufacturer’s recommendation
2 . Improperly set low pressure freeze ctrl 2 . Check the safety time delay low pressure control for proper setting at the
beginning of each season
3 . Operating with LPC bypassed 3 . The safety time delay low pressure control is wired in series with the
compressor motor contactors . (Do not bypass it)
4 . Improper chilled water circulation 4 . Use an ample sized cleanable strainer in the chilled water circuit . Make
certain in the strainer is clean to insure full flow and velocity of chilled water .
It may sometimes be necessary to treat the water to prevent
formation of deposits
5 . Not draining for winter shutdown 5 . When the system is shut down for the winter, remove the drain plugs and
drain the cooler . Blow out remaining water with air
6 . Improper setting of low water temp . control 6 . Check setting of (freeze-stat) temperature control