Planning Notes - Wolf SED-750/250 Instructions De Montage

Installation
Connection to solar circuit
Connection to heating equip-
ment
Sizing of the
safety devices
Sizing of the
safety devices
12

Planning notes

The double tank may be installed only in a frost-protected area. Otherwise, it must be
emptied in case of danger of frost.
The foundation must be even and able to support weight in order to carry the weight of
the tank including its water content.
Connect the solar circuit supply to pipe coupling (H) and the solar circuit return to the
underlying pipe coupling (F), 1".
We recommend connecting the double tank according to the pipework diagram on
page 13.
The tank must be equipped with its own safety devices (safety valve, expansion tank)
if it can be disconnected from the heating system or the existing components are in-
sufficient for the additional buffer volume.
The installation of splash guards or other narrowings into the supply pipe leading to the
safety valve is not permitted.
Safety valves:
Only a component-tested safety valve may be used. The response pressure must fit
all system components and may not exceed 3 bar on the heating water side or 10 bar
on the industrial water side.
Exceeding the permissible operating pressure may cause leakages and destruc-
tion of the storage tank.
The safety valve is designed according to DIN EN 12828. For each collector a thermal
output of 1.5 kW is assumed:
Total thermal output
(boiler + collector)
< 50 kW
< 100 kW
The exit pipe must be at least equal in size to the safety valve outlet cross-section, may
have no more than 2 elbows and a maximum length of 2 m. If 3 elbows or a length up
to 4 m are absolutely required, then the total exit pipe must be designed one nominal
size larger. The use of more than 3 elbows or a length over 4 m is not permitted. The
exit pipe must be installed with downward gradient. The drain pipe behind the drain
funnel must have at least twice the cross section of the valve entry. In the proximity
of the exit pipe of the safety valve, generally on the safety valve itself, a warning label
must be attached with the following text: "During heating, water exits from exit pipe for
safety reasons! Do not plug the pipe!"
Diaphragm expansion tank, on heating water side
The diaphragm expansion tank is designed according to DIN 4807:
Size of diaphragm
Total volume of the
expansion tank* [litres]
heating water [litres]
according to DIN 4807
< 750
< 1 000
* Selected boundary conditions:
- Primary pressure diaphragm expansion tank = 1.5 bar
- Response pressure of the safety valve = 2.5 bar
- Hot water heating system up to 110 °C (no steam)
nominal size
DN15
DN20
90
120
3043753_0108