AEC FSS Series 1.5- 10 HP Fountain Solution Systems - Manual (Page 65)

Page 64 FSS Series Fountain Solution Systems
IAE-600
Problem Possible cause Solution
Compressor contactor
holding coil open.
Repair or replace.
Defective pump motor to
compressor auxiliary contact.
Repair or replace.
Pump runs; compressor does
not (cont’d.).
Broken wire in the
compressor control circuit.
Locate and repair.
Clear any blockages of flow
through the condensor.
Compressor does not run.
Tripping of the high pressure
switch indicates a lack of
water flow through the
condensor coil (water-cooled
condensor) or a lack of air
flow (air-cooled condensor).
Tripping of the differential
pressure switch indicates
Freon leakage.
Repair Freon leak.
Pump runs, compressor
cycles at short intervals. Incorrect High/Low
Thermostat setting.
Lower set point to 10°F (6°C)
below desired leaving water
temperature.
Water/glycol mixture
inadequate for process.
Make sure that the
water/glycol mixture
protection is right for the
process.
Defective or improperly set
High/Low thermostat.
Adjust or replace.
Refrigerant low pressure
switch is set too high. Call service to adjust
pressure control.
Solution temperature is too
high.
Refrigerant charge is low.
Call service to find and repair
the leak, then have
refrigerant added.
Pump running in reverse.
Verify rotation; if running in
reverse rotation, reverse any
two main power leads. Re-
verify for correct pump
rotation.
Pump pressure low (refer to
curves for normal pressure
for various pumps).
Check for foreign matter. Clean the system.
Pump pressure is too high. Restricted water flow.
Check for partially closed
valves etc. Make sure that all
lines are properly sized.
Clean filters.
Restricted condenser air.
Clean condenser.
Unit low on refrigerant. Check the refrigerant charge.
Compressor not operating
efficiently.
Call service.
Unit runs continuously, but
not enough cooling power.
Unit under-sized for
application.
Call sales rep.