SmartCool
TM
- D
Precision Air Conditioning
214
Precision Air Conditioning
Installation, Maintenance and Commissioning Manual :6877419 02/2013
Troubleshooting –
Unmatched Outdoor Units
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
Condenser coil clogged or dirty Clean condenser
Overcharge of refrigerant, normally troublesome
in warm weather
Reclaim excess refrigerant from system
-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
Fan operating too fast in low ambient conditions Check fan speed controller adjustment - if faulty -
replace
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 Carry out continuity check at terminals “TK” in
motor terminal box, if tripped and motor hot -
check bearings, if tripped and motor cold -
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)
slowly
Incorrect pressure 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)
Motor/capacitor faulty Replace
OUTDOOR
(34 pages)
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