EXH EXQ RPCQi Icon DD Motor or Control Box Diagnostics
Note! To accurately diagnose faults on Seeley products, we recommend that Service Technicians use a wall controller on a short test lead at the cooler. This way the functions of the cooler, as well as the diagnostics LED's can be immediately observed in relation to the commands issued by the controller.
EXH compatible - 4 pin RJ connector communication cable - 1 metre test loom Pt# 831534
EXQ compatible - 6 pin RJ connector communication cable - 1.5 metre test loom Pt# 862873
RPCQi compatible - 6 pin RJ connector communication cable - 1.5 metre test loom Pt# 862
IMPORTANT SAFETY NOTE! When any side panels are removed, always test evaporative coolers with the pump disconnected or in ventilation mode, as wet roof surfaces can create a safety hazard. Also care must be taken when working in close proximity to moving parts.
PROBLEM:
Unit fills with water, pump runs but fan motor does not start.
Fan does not run in “vent” mode either.
THE 2 GREEN FLASHES and the RED SAL LIGHT ARE NOT RELEVANT TO THIS ISSUE
The following points should help determine whether it’s the fan motor or the control box which is at fault.
IMPORTANT!!! Due to the protective design of the circuitry of the motor and control box, the chance of both components failing together is extremely low. Hence, the importance to diagnose correctly to prevent unnecessary costly part replacement.
• Does the motor spin by hand?
The fan should spin freely and do at least one or two full turns.
If the fan is stiff to turn, unplug the motor power cable at the box and try spinning again. If still not turning easily, measure the motor winding resistances.
• What are the ohms readings of the 3 x phases or the motor?
This is a 3 phase DC motor, tested the same way as any 3 phase motor.
The readings, in Ohms (Ω) should all be approximately the same.
Any significantly different readings indicate a short or open circuit in the motor windings. If all resistance readings are acceptable and the fan spins freely when disconnected from ICON box, then there is a short circuit in the 3 phase supply section of the PCB. A new ICON control box is required.
Looking at the 4 x motor diagnostic LED's on the left hand side of the Icon control box
• Does the “Power” LED light up when switched to vent mode?
Turn the unit on in “vent” mode while you are on the roof.
If the Power LED does NOT light up, the control box has failed to switch power to the motor. Unplug both cables from the motor and try again. If the result is the same, replace the control box. If the LED comes on when the motor is fully disconnected, replace the motor.
If the Power LED comes on but the other three stay off, unplug the sensor cable at the control box and closely inspect both plugs for any obstructions then plug back in and try again. If the result is the same, replace the motor.
• Do all four LED’s come on?
During normal operation all four LED’s should come on. If one of these goes out, then that is the fault indicator e.g. Thermal O/L goes out, motor has tripped its internal thermal overload switch.
If the Fan Speed LED goes out (or starts to flash) it may be something simple like not enough windows open, squashed or restricted ducting, some vents have been shut off or the weather seal has opened fully.
IMPORTANT! If a motor has recently been changed and it only runs for a brief period of 30 second to a minute and the fan speed LED is flashing - check the fan has not been put in backwards when motor was replaced.
See attached Icon DD Service Guide extracts Pdf : For some more comprehensive information on Diagnosing Motor and Control box diagnostics and DD motor replacement procedures.
EXQ130 & EXS140 COOLERS ONLY FAN MOTOR REMOVAL - SMALL CABINET
