Airedale Air Cooled Condensers R407C - Manual (Page 20)

C11-45 / CS50 - 105 CONDENSERS
20
Condensers
Installation and Maintenance Manual: 6259642 V1.2.0 02/2013
Troubleshooting
FAULT POSSIBLE CAUSE REMEDY/ACTION
Unit Will Not Start No power. Check power supply to the controller.
Wired incorrectly. Check wire connections in accordance with wiring
diagram on control box lid.
Loose wires. Check all wires, connections, terminals etc.
Head Pressure too High Condenser coil clogged or dirty. Clean condenser.
Overcharge of refrigerant. Normally troublesome
in warm weather. Remove excess refrigerant from system.
Air or other non-condensable gas in system. Evacuate system and re-charge with new
refrigerant.
Head pressure controller faulty. Check fan speed controller - if faulty - replace.
Fan not operating or operating inefficiently. Check motor - if faulty - replace.
Head Pressure Too Low Fan operating too fast in low ambient conditions. Check fan speed controller adjustment - if faulty -
replace.
Condenser Fan Not Operating -
Power On Power supply failure. Check power supply at circuit breaker.
Wiring to motor. Check voltage at motor terminals.
Motor / fan assembly jammed. Isolate unit and check free rotation of motor/fan
assembly. If faulty - replace.
Motor internal overheat protector tripped. C arry out continuity check at terminals “TK” in
motor terminal box. If tripped and motor hot -
check bearings. If tripped and motor cold - replace
motor.
Faulty motor windings/capacitor. Motor humming would indicate fault in motor or
capacitor. Check windings for continuity and if OK
replace capacitor.
Minimum speed set too low. Adjust head pressure controller to suit.
Faulty pressure sensor. Check electrical connections are secure at
controller and pressure sensor. Replace controller
and sensor (as they are matched sets).
Faulty Fan Speed Controller. Link wires “line” and “load” to bypass controller. If
motor runs full speed - replace unit.
Condenser Fan Runs Too Fast High ambient condition or excessive re-
circulation of air around condenser coil.
Check installation against design.
Minimum set speed setting incorrect. Adjust as necessary.
Incorrect pressure sensor setting. Adjust sensor screw as necessary.
Faulty Fan Speed Controller. Replace controller and sensor (as they are
matched sets).
Faulty pressure sensor. Replace controller and sensor (as they are
matched sets).
Condenser Fans Runs Only
Slowly Incorrect pressure setting. Adjust sensor screw as necessary.
Faulty Controller. Replace controller and sensor (as they are
matched sets).
Faulty Pressure sensor. Replace controller and sensor (as they are
matched sets).
Motor/capacitor faulty. Replace.