CyberOne EC DX IOM Manual
Symptom
Probable Cause
Recommendation
Blower Fails to Start (Con’t)
g. EC fan’s internal overheat protection
Determine the cause of the interruption
interrupted fan motor operation.
Determine the cause of the interruption and
correct. Possible causes are:
1.
Locked rotor.
2.
Low supply voltage > 5 seconds.
3.
Loss of phase > 5 seconds.
After causes 1, 2, and 3 are corrected, the
motor will automatically reset.
After the causes 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 electrical drawing.
Condenser Pressure Too High
a. Non-condensable gas or air in system.
Recover system and recharge. Replace
drier/strainer. Evacuate to 50 microns and
recharge.
b.
Condenser air intake is blocked.
Remove debris and clean condenser.
c.
Overcharge of refrigerant.
Reclaim excess refrigerant from system.
d.
Low water/glycol flow to water-cooled
condenser.
Reset-determine cause and fix.
e.
Condenser fan not operating.
Check pressure/temperature operating
switches and motor. Replace as needed.
f.
Water/glycol temperature too high.
Check flow and operation of drycooler.
g.
Condenser pressure regulating valve set-
ting too high.
Adjust to obtain correct pressure.
h.
Flow of water/glycol too low.
1. Check glycol solution level and concentra-
tion.
2.
Valves not open or partially open. Repair/
replace as needed.
3.
Air in system - bleed system.
4.
Check all strainers and clean if needed.
i. Water/glycol solution not mixed prior to
adding to system.
Condenser Pressure Too Low
a. Loss of refrigerant (indicated by bubbles
in sight glass).
Remove solution and premix. Refill system.
Locate and repair leak. Recharge system.
b.
Condenser fan controls not set properly.
Adjust or repair controls.
c.
Control pressure adjusted too low.
R407C- Readjust to 320 psig.
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