(© Oct, 2007)
Air Technology Systems, Inc.
Compact CW Series Installation, Operation & Maintenance Manual
SYMPTOM
PROBABLE CAUSE
RECOMMENDATION
Chilled Water Valve Fails
a. Temperature setpoint too high
Adjust to correct temperature setting
to Open or Close
b. No control power to the valve
Valve actuator is wired incorrectly.
Check wiring schematic and rewire if
required.
c. Actuator failed
Replace actuator
Blower(s) Fail to Start
a. Power failure
Check main voltage power source
input cable
b. Control transformer circuit
Check for short circuit or ground fault,
breaker tripped
if none re-set circuit breaker.
c. Motor starter protector tripped
Reset motor starter protector and check
amperage of motor. Compare to setting
on motor starter protector and adjust to
FLA.
d. Condensate overflow switch open.
1. Ensure unit is level
2. Check that condensate pan is draining
properly. Clear obstructions.
e. Defective contactor
Repair or replace
Control is Erratic
Wiring improperly connected or
Check wiring against schematic
broken
diagram
4-2
humidifier. A change cylinder light on the humidifier
cabinet will illuminate (red) when the cylinder requires
replacement.
NOTE
The red light may illuminate during initial start-
up but it doesn’t necessarily mean the cylinder
needs to be replaced.
Refer to the humidifier operator’s manual supplied
under separate cover for detailed instructions for
changing the cylinder.
4.1.1.7 Condensate Pump
The condensate pump should be inspected semi-
annually and cleaned. Ensure that the float works freely.
Wipe the float with a wet cloth and detergent to remove
dirt. Clean the tank bottom. Check that the discharge
line is open and water can pass through it freely.
4.2
Troubleshooting
Turn off all power to the unit before conducting any troubleshooting procedures, unless the procedure specifi-
cally requires the system to operate. For troubleshooting purposes, the system may be operated with the
doors open by using
the yellow knob
to turn the shaft of the main power disconnect switch to the
"On"
position. When the switch is turned on, high voltage will be present inside the cabinet. Exercise caution
to prevent injury. Keep hands, clothing and tools clear of the electrical terminals and rotating components.
Ensure that your footing is stable at all times.
