INSTALLATION
Electrical connection
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f Pivot the terminal area to the side.
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f Fix the terminal area in place with the locking mechanism.
XD02 connection: Electric emergency/booster heater (NHZ)
f Connect the electric emergency/booster heater:.
If the heating water temperature falls below 15°C while defrost-
ing, the emergency/booster heater is switched on. If on special
systems you can ensure that no defrosting will occur, you need
not connect the emergency/booster heater.
Additional functions of the emergency/booster heater:
Appliance func-
tion
Effect of the electric emergency/booster
heater
Mono energetic op-
eration
If the dual mode point is undershot, the electric emer-
gency/booster heater safeguards both the heating oper-
ation and the provision of high DHW temperatures.
Emergency mode
If the heat pump shuts down due to a fault, the heating
output is covered by the electric emergency/booster
heater.
Heat-up program
(only for underfloor
heating systems)
Where return temperatures are <25°C, the electric
emergency/booster heater must provide the necessary
heat for screed drying.
With such low system temperatures, the heat for screed
drying must not be provided by the heat pump, other-
wise the frost protection of the appliance can no longer
be guaranteed during the defrost cycle.
When the heat-up program has ended, the electric
emergency/booster heater can be disconnected if it is
not required for appliance operation.
Please note that during the heat-up program, emergency
mode is not available.
Pasteurisation
mode
The electric emergency/booster heater starts automat-
ically when pasteurisation mode is active. The DHW is
then regularly heated to 60°C to protect it against the
growth of legionella bacteria.
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