CyberAiR DX Floor Mounted IOM Manual
SYMPTOM
PROBABLE CAUSE
RECOMMENDATION
Evaporator Fan(s)
Fail to Start
a. Power failure.
b. Motor starter protector tripped.
c. Control transformer circuit
breaker tripped.
d. Defective contactor
e. No control signal to fan(s).
f. EC fan’s internal overheat protection
interrupted fan motor operation
1. Check main power source voltage.
2. Check power input cable.
Reset motor starter protector and check
amperage of motor.
Check for short circuit or ground fault, if
none, reset circuit breaker.
Repair or replace.
Check the Control I/O Board for a 0-10 VDC
control signal to the fan(s). Refer to the
electric drawing to determine the correct I/O
board terminal numbers.
This must be done within 15 seconds of turning
the disconnect switch “On” or the controller will
go into “Air Proving
Alarm” mode.
Determine the cause of the interruption and
correct. Possible causes are:
1. Blocked rotor
2. Low supply voltage > 5 seconds
3. Loss of phase > 5 seconds After
causes 1, 2, and 3 above are
corrected, the motor will automatically
reset.
After causes 4 and 5 below are corrected, the
fan(s) must be manually reset by turning off
power for 20 seconds:
4. Over temperature of electronics
5. Over temperature of motor
Control is Erratic
Wiring improperly connected or
broken.
Check wiring against schematic
diagram.
Condenser
Pressure Too
High
a. Non condensable gas or air in
the refrigeration system.
b. Condenser air intake is blocked.
c. Overcharge of refrigerant.
d. Condenser fan not operating.
e. Control pressure set too high
f. Water/glycol temperature too high.
g. Flow of water/glycol too low.
Recover refrigerant. Replace drier/strainer.
Evacuate to 50 microns and recharge.
Remove debris and clean condenser. Reclaim
excess refrigerant from system.
Check pressure/temperature operating
switches and motor. Replace as needed.
Adjust setting to obtain correct
pressure.
Check flow and operation of drycooler.
1. Check glycol solution level and
concentration.
2. Valves not open or partially open.
Repair or replace as needed.
3. Air in system - bleed system.
4-3
