Manual
75
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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 rst sign of
bubbles are shown in sight glass Add back refrigerant just until bubbles clear
4 Air temp entering condenser too high 4
5 Insufcient air ow 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 ow 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