HS Tarm TPK, User Manual

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3.3 Installation with domestic hot water tank (Scandpell)
The boiler can be installed with either a storage tank or a domestic hot water tank, if the control unit is to
control one of these.
In other words, it is not possible to set up a system with both a storage tank and a hot water
tank controlled by the control unit.
In order to avoid corrosion in the boiler, a device must be installed that ensures a minimum
return temperature of 55 °C to the boiler from the unit.
3.3.1 Installation with pump for domestic hot water priority
1: TPK/Scandpell
2: Loading Unit 55 °C (you could also use a thermostatic 3-way valve and pump – use a balancing valve on the shunt loop.
3: Hot water tank VBF 85, VBF 100 or VBF 150
4: Domestic hot water priority pump
5: Expansion tank (the size should be adapted to the total volume of the system)
6: Safety valve
7: Non return valve
If it is decided that the control unit’s hot water facility is to be used, it is important that the non return
valve is installed, as shown in the diagram. The summer/winter function could easily be used with this kind
of installation (Boiler parameters in User’s manual): In case this function is desired it is set to summer
function.
Control unit set up:
Function of extra sensor is set to the domestic hot water (Service menu).
Pump function: Boiler pump (Service menu)
Set the desired hot water temperature (storage tank menu in User’s menu)
Minimum temperature is set at the same place by setting the hysteresis at a suitable value.
You can either choose between absolute or divided priority (domestic hot water in Hot water menu in
User’s menu).
See also the functional description in 5.1.2.