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Troubleshooting (continued)
Problem
Chiller shuts down due to a
High Pressure switch alarm.
Chiller shuts down due to a
Low Pressure switch.
Possible cause
Low air flow across the condenser.
Fan not operating.
High ambient temperature.
Insufficient clear space around unit.
Clogged air filter.
Attempting to operate the chiller with
process coolant below 45°F {7.2°C}.
Low refrigerant charge.
Poor heat transfer in the evaporator
tank due to a high percentage of glycol
to water.
Low flow through the evaporator due
to glycol foaming.
Low flow through the evaporator.
Faulty pump motor.
Clogged pump strainer.
Solution
Check for dirty condenser fins. Clean
as necessary. See Maintenance section
entitled, Cleaning the Air-cooled
Condenser.
Reset High Pressure switch. See
Operation section entitled, Resetting the
High Pressure Safety Switch.
Check for loose fan blade or
open/grounded motor winding.
Move the chiller to a lower ambient
temperature location.
Increase clearance around the chiller.
Replace filter. See Maintenance section
entitled, Cleaning the Air-cooled
Condenser.
Increase temperature setpoint above
45°F {7.2°C}. See Operation section
entitled, Starting the Chiller.
See Installation section entitled,
Checking the Refrigerant Charge.
Reduce the glycol mixture of the
process coolant. See Installation
section entitled, Filling the Chiller.
Replace the process coolant. See
Installation section entitled, Filling the
Chiller.
See Maintenance section entitled,
Cleaning the Brazed Plate Evaporator.
Contact Conair Service.
Clean or replace the strainer. See
Maintenance section entitled, Cleaning
the Pump Strainer.
6
Troubleshooting
Troubleshooting l 6-7
NOTE: The is a normal
shutdown for other
alarm conditions when
the chiller’s main power
has been switch off.
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