GB.EXCHSILV2.141119
We reserve the right to alter specifications.
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5. Trouble shooting
To open the heat exchanger control system
Before you open the heat exchanger control system, isolate the line voltage and wait at least 2 minutes. Failure to do so
will expose you to the risk of coming into contact with harmful residual voltage inside the unit.
Troubleshooting when the heat exchanger control system is controlled with external (A/D) signals:
Symptoms
Cause
Action
The motor is not rotating
There is no power supply
Check whether there is voltage on the heat exchanger control system's ”L” and ”N” terminals on
the models for 230 V.
(Operating voltage is specified on the rating plate, affixed to the side of the heat exchanger control
system.)
Poor electrical connections
Check the connectors and other electrical connections
There is no in-operation signal
Short-circuit Terminals 7 and 8 in the heat exchanger control system junction box marked (GND)
and ”Start/Stop” (Fig. 5).
There is no 0 – 10 V DC control
signal
Check that the 0 - 10 V DC control signal is correctly connected to Terminals 13 and 14 in the heat
exchanger control system junction box marked (GND) and ”0-10 V in” (Fig. 5).
The motor has been stopped by the
internal protective motor switch 3
times due to overloading or some
other alarm.
Reset the alarm by short-circuiting Terminals 11 and 12 in the heat exchanger control system
junction box marked (GND) and ”Alarm reset” (Fig. 5).
You can also reset the alarm by switching off the supply voltage to the heat exchanger control
system and switching it back on after 60 seconds.
Defective heat exchanger control
system
Replace the heat exchanger control system
Defective motor
Replace the motor
The heat exchanger control
system switches off.
¤) Remember to reset the
alarm by short-circuiting
Terminals (GND) and
"Alarm Reset".
At least two phases are short-circuit-
ed on the motor wiring terminals.
Eliminate the short-circuit on the motor wiring terminals ¤)
Defective motor
Replace the motor ¤)
Overloaded motor
Remedy the overload condition of the motor ¤)
Defective motor
Replace the motor ¤)
Overloaded motor
Remedy the overload condition of the motor ¤)
