Functional Description - Danfoss VVX-I Operating Manual

Operating Guide Termix VVX-I with complete insulation

2.0 Functional description

Indirect substation for flats and single family houses.
Application
The Termix VVX-I is a complete solution for hot water and
space heating with optimal safety, efficient energy transfer,
service-friendly construction and a compact design. The substation
is used if a heat exchanger is required or on a conversion to district
heating where the existing equipment is unsuitable for direct
connection.
District heating (DH)
The substation is prefabricated with a differential pressure
controller, fitting piece and sensor pockets for insertion of an
energy meter as well as strainers.
Heating (HE)
The heating side consists of a plate heat exchanger, safety valve,
manometer, drain valve, air valve, expansion vessel and circulation
pump. The temperature of the heating can be controlled
thermostatically or by an electronic controller with an outdoor
temperature sensor. Depending on the application, different heat
exchangers dimensioned for central or floor heating will be used.
Domestic hot water (DHW)
The domestic hot water is prepared in the heat exchanger and the
temperature is regulated with a flow-compensated temperature
controller with integrated differential pressure controller. The
DH water is cooled very efficiently by the heat exchanger,
thereby creating an excellent operating economy. The IHPT
valve ensures a stable hot water temperature by varying loads,
supply temperatures and by high and varying differential pressure
without the need for readjusting the valve. This protects the
heat exchanger against overheating and lime scale formation.
Furthermore the IHPT valve has an integrated idle temperature
controller, which keeps the house supply line warm. This shortens
the waiting periods during summer when the heating system is in
reduced operation, which is ideal where high comfort is requested.
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