10
Maintenance
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.
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.
Number of impulses
(green indicator)
description
1
The unit was switched off because the temperature has exceeded the
maximum value (fault signal will not disappear until the appropriate rate
of water ow is reached).
2 The unit was switched off by a master appliance.
3 The inlet temperature sensor failure.
4
The unit was switched off because the air bubbles in the heating box (the
unit will not heat again until the fault is resolved and the appropriate rate of
water ow is reached).
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