WALLTHERM
®
produced and developed by
Walltherm
®
27/64
The water connections:
Legend:
a)
Cold water inlet with thermal process safeguard valve
b)
Pressure safety valve 3 bar
c)
Filling and drain valves
d)
Manometer (pressure) (not visible on the picture)
e)
Expansion vessel (not visible on the picture)
f)
Non return valve
g)
Discharge
Information for the water connection:
The installation of filling and drain valves is
recommended to clean the water circuit and to bleed
the system with an external pump unit.
A pressure safety valve 3 bar (b) has to be installed
between boiler stove and pump unit.
An expansion vessel with enough capacity has to be
installed in the heating system.
Fig. 4.e.1
Pump unit with mixing valve:
To avoid that the boiler stoves heating exchanger cools down and to avoid the
development of condensation because of a too low water return temperature (under
60°C), the pump unit is equipped with a 3 way mixing valve.
This mixing valve makes the heating water partly re-circulate until the return temperature
achieves more than 60°C. This pump unit should be installed in the heating room near the
storage tank.
The mixing valve is equipped with a thermostat head, which can be turned from pos. 1 to
7, by turning the thermostat head you can decrease or increase the temperature of the
return flow.
The pump of this unit is a high efficiency pump.
The return flow temperature should have minimum 60°C.
!