Unical XC-K Series, Инструкция по установке и обслуживанию

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Installation instructions
53
The panel boards of the XC-K boilers (in cascade) automatically
switch the burners off when the temperature in the boiler reaches
the value set on the heating controller.
They also manage the pump to fill a storage tank for DHW
production.
The heating systems are managed automatically based on the
data detected by the boiler, external, ambient and flow probes.
The high temperature zone system pump is made ready for
operation by the control switch pos. 20 of the MASTER board,
and will only switch off when the temperature set on the heating
controller has been reached.
The low temperature zone system pump is made ready for
operation by the control switch pos. 21 of the MASTER board,
and will only switch off when the temperature set on the heating
controller has been reached.
The storage tank charge pump for DHW production switches
on automatically and will only switch off when the temperature
set on the heating controller has been reached.
The panel is set up to manage the modulating burners.
With this system configuration, the heat controller is capable
of regulating:
- direct zone system; the control unit commands the
system pump. The room temperature is controlled by
the programming curves set in the heating controller;
- one zone system with motorised mixer valve: the flow
For practical connections, both electrical and of the probes, see the diagrams supplied with the
panel boards code 38778 and 37901.
probe (downstream the mixer valve) must be fitted; the
control unit commands the system pump and the mixer
valve. The room temperature is controlled by the
programming curves set in the heating controller;
- DHW production through storage tank;
- anti-legionella function with increase of water
temperature in storage tank (function not enabled in
factory, but can be enabled by customer)