Manual Wamsler K148F (page 50 of 120) (English, German, French, Italian)

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Up to a static height of 10 m, the capacity pressure expansion vessel is dependent on the

water capacity of the system as follows:

Water content Vessel size

Litre Litre

up to 111 12

112 - 167 18

168 - 231 25

232 - 324 35

325 - 463 50

464 - 741 80

There should no manually operable shut off valves installed between the expansion vessel

and the stove.

A ventilation section at least 0.5 m above the highest circulation point in closed systems

with a diameter of at least 1″ should be arranged and a ventilation valve provided at the

upper end.

In gravity systems the rise and fall of horizontal pipes should be at least 0.5 cm/m.

Radiators with more than 25 ribs or plate heat exchangers over 1.5 m long should be di-

agonally connected to the flow and return pipes.

Where there is a lower distribution ventilating valve it must be provided on each radiator.

The radiators should not be inclined towards the ventilation. As radiators are usually at the

same level on the floor where the stove is installed, these radiators should all be connected

to a circulating pump as matter of course.

If however a pure gravity plant has to be executed without pumps, then the centre of the

radiator should not be lower than the centre of the boiler.

In the simplest installation case, the circulation pump is connected to the mains by a switch

and runs continuously during the heating period, while the water capacity of the stove is

regulated by an integrated temperature controller.

The pumps can however also be controlled from a maximum-thermostat in the domestic

water boiler, to ensure a minimum temperature for the domestic hot water.

It is also possible to switch the circulating pumps through a room thermostat. In this case

however the gravity circulating domestic water boiler should not have a capacity of less

than 260 l, if there are no other radiators on gravity circulation are connected.

Independently of the control types described above, the heating circulation and/or boiler

loading pump should primarily be controlled through a thermostat with a fixed switch on

temperature of between 50 and 55 °C, situated immediately at the stove's return flow con-

nection following an adjustable bypass close to the stove between the flow and return

lines, to avoid a low temperature operation of the stove boiler.

In the installation unit which can be supplied as an accessory there is a thermal boiler

monitor integrated as a continuous regulating valve. The pump controls mentioned above

are then not needed.

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Wamsler K148F Manual

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