SystemAir RB Serie Manuel page 5

Maintenance
1. Normally, no maintenance is needed. A periodic function check, and re-tightening of the power
terminals, must be carried out at least once a year.
2. To maintain the insulation characteristics of the heating coils, they must be activated for 24h,
at least every 3 months.
Overheating
If the manually reset cut-out has tripped, the following must be considered:
1. Switch the power supply off.
2. The lid of the heater may only be opened by qualified and authorized personnel.
3. Carefully investigate the cause of the tripping of the cut-out.
4. When the fault has been rectified, the overheating cut-out may be reset.
Troubleshooting
RBM
● Check that the sensor is of the correct type and that it is terminated correctly.
●
Check the resistance of the sensor and the set value potentiometer.
Disconnect them from the terminals before any measurements are taken.
Sensors for 0...30°C should have a resistance of 10k @ 30°C, 11 k @ 20°C and 15k @ 0°C.
The external set value potentiometer should have a resistance of 0...5k .
Full heating power but no regulation
●
Strap/short-circuit the PCB terminals #15 and #18.
If this results in the heating now being turned off, then the fault is in the external sensor
circuitry. If this doesn't turn the heating off and no LED is lit up on the PCB, then there may
be a short in a triac.
No heating
●
Check that there is mains voltage at the heater supply terminals, and that the manual reset
overheating cut-out, has not tripped.
●
Check the interlocking devices, fuses, breakers, etc.
●
Disconnect the sensor from the terminals.
If the heater starts now, then the fault is in the external sensor circuitry.
Otherwise, the fault is in the controller (TTC).
Ω
5
Ω
.7
Ω
Ω