Dip Switch Settings - Riello NXHM 04 Installation Manual

The Domestic Hot water sensor is connected directly to the
PCB on plug CN13. There is a flying lead with a plug on for
connecting this, this is located at the right-hand side of the
unit. As in the
picture to the right-hand side.
The Domestic Hot water sensor is supplied with a 10m Cable,
this cable can be extended to a maximum of 20m. This
should not be shortened.

DIP SWITCH SETTINGS

There are 3 sets of dip switch located on the unit's main PCB, these are S1, S2, S4 these control certain
function of the unit, so must be set accordingly to allow correct operation.
S1 Dip Switch's control the IBH if fitted in the unit.
S2 Dip Switch's control the Internal Pump.
S4 Dip Switched are for multiple unit setups.
S1 Dip switch 1/2 should be set to OFF/OFF, this will deactivate the IBH (internal back up
heater is not fitted to the Riello unit as standard)
S1 Dip switch 3/4 should be set to OFF/OFF, this will deactivate the IBH and AHS
(additional heat Source) if fitted set to OFF/ON
S2 Dip switch 1 should be OFF
S2 Dip switch 2 should be set to OFF if the immersion heater is connected to the unit. If
the Immersion heater is independent from the heat pump this must be set ON, failure to
do so will lead to faults.
S2 Dip switch 3/4 should be set according to the pump installed in the unit.
S4 Dip switch 1/2/3/4 all off as Default.
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