3.8 Distribution circuits
The only use for a mixing valve is in a heating system with an external
heat source (an oil burner or equivalent) or where there are more than
one heating circuits, for example a mix of radiator and underfloor
heating.
There are three available mixing valve options:
▪
Mixing valve (Activation, see chapter "Activate the external auxiliary heater in iTec Standard")
▪
Distribution circuit (DISTR. CIRCUIT) 1
▪
Distribution circuit (DISTR. CIRCUIT) 2 (Requires expansion card)
The mixing valve is used between the heat pump, an external auxiliary heater (may be an oil burner or equivalent) and the heating
system. The purpose of this valve is to mix cold water into the heated water from the external auxiliary heater (on/off heater) to ensure
that the temperature out on the heating system is not too high. The control system in the heat pump controls the mixing of hot and cold
water out on the heating system.
Distribution circuits 1 and 2 are used where there are more than one heating circuit, for example a mix of radiator and underfloor
heating. The purpose of these distribution circuits are to supply a preset temperature to each one of the heating circuits.
Activating DISTR. CIRCUIT 1
The following settings are made in the Service Menu. If not already in the Service Menu, enter the Service Menu by pressing and holding
left arrow (<) for at least 5 seconds. Use + or – to move up and down in the menu.
Activating distribution circuit 1 in the SERVICE menu:
▪
SERVICE
▪
INSTALLATION
▪
SYSTEM
▪
DISTR. CIRCUIT 1
▪
HEAT CURVE or CONSTANT TEMP
When HEAT CURVE is selected, the dis-
tribution circuit controls to the set
heat curve.
When CONSTANT TEMP is selected,
distribution circuit controls a constant
temperature regardless of outdoor
temperature.
▪
Press left arrow (<) several times to exit the Service Menu.
DISTR. CIRCUIT 2 requires expansion card.
Commissioning iTec
Thermia Värmepumpar VIJSR102
15
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