Functional Description - Danfoss Termix VMTD-F MIX-I Operating Manual

Operating Guide Termix VMTD-F MIX-I

2.0 Functional description

District heating substation for direct heating and
instantaneous domestic hot water with thermostatic control.
Designed for wall-mounting.
Application
The Termix VMTD-F MIX-I is a complete solution with built-in
water heater and heating system with differential pressure control
and mixing loop. The Termix VMTD-F MIX-I is applicable for for
single-family houses and for decentralized systems in multi-family
houses.
District heating (DH)
The substation is prefabricated with a differential pressure
controller, fitting piece and sensor pocket for insertion of a
heat meter as well as strainer and ball valves. Furthermore the
substation is delivered with a mixing loop including pump, controls
and non-return valve.
Heating (HE)
The heating circuit is designed for direct connection. The
differential pressure controller sets the optimum operation
conditions for radiator thermostats in order to enable individual
temperature control in each room. The mixing loop creates a
suitable temperature level e.g. for floor heating. In order to enable
a timedependent temperature control program, a zone valve with
actuator and a room thermostat can be included as an option.
Domestic hot water (DHW)
The domestic hot water is prepared in the heat exchanger and
the heat exchanger and the temperature is regulated with a flow
compensated temperature controller with integrated differential
pressure controller. The heat exchanger cools out the DH water
very efficiently, thereby creating an excellent operating economy.
The Danfoss 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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