Planning Notes - Wolf SPU-2 Assembly Instructions Manual

Installation
Connection to heating
equipment
Sizing of the
safety devices
Sizing of the
safety devices
12

Planning notes

The buffer 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.
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 insufficient
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. See connection diagram on page 13 as an example for a
possible pipework assembly.
Safety valve, heating water side
Only a component-tested safety valve may be used. The response pressure must
fit all system components and may not exceed 6 bar. 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)
50kW
100kW
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, 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:
Total volume of the
heating water [litres]
< 500
< 750
< 1000
< 1250
< 1500
* 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
Size of diaphragm expansion
tank* [litres] accord. to DIN 4807
60
90
120
150
180
3043757_1106