12
Maintenance
Co-operation with other appliances
Unit is equipped with the BLOK and NA clamps.
BLOK - relay input that switches off the slave appliance, the circuit that is connected
to the BLOK clamps (max. 0,1A 250V-) will be opened at the time of heating operation
starts up.
NA - input that locks the unit operation, opened NA contacts locks the heating operation
- co-operation with the master appliance.
Wire (2 x 0,5mm
2
) for BLOCK and NA clamps should be run inside the unit on the right
side.
The wire connections must be performed by a qualied person.
Filter cleaning:
1. Cut off power and cold water supplies.
2. Take off the unit’s cover.
3. Undo the inlet tting - on the cold water side.
4. Take the lter out from the inlet tting.
5. Clean up the lter.
6. Fix the lter back, put the gasket and do up the inlet
tting.
7. Open the cut-off valve on cold water supply pipe - check
connections for leaks.
8. Fix the unit’s cover back.
9. Vent the water system - see Venting section.
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