9
The following material combinations are approved for metal pipework installations:
Cold water inlet
hot water outlet
Copper pipe
Copper pipe
Steel pipe
Steel pipe or copper pipe
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Thoroughly flush the pipework before connecting the appliance. Foreign bodies, such as abraded plastic
or metal, rust, sand or sealant can impair the operational reliability of the appliance.
!
Material losses
To protect the connections against corrosion the water connection must be made with flat gaskets.
The use of hemp on connections is not permissible.
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Install the hot water outlet line and the cold water inlet line (see chapter "Specification
/ Dimensions and
connections").
Hot water circulation
A hot water circulation is not allowed.
Safety equipment
A T&P valve or a cold water expansion control valve must be installed. Observe the applicable local and re-
gional regulations.
T&P valve (850
kPa)
D
00000
6
3
5
4
7
1
2
1 T&P valve
2 Reducer from R
3/4 male thread to Rp
1/2 female thread
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If specified, install a type-tested T&P valve with reducer, using the corresponding connection on the
appliance.
The response pressure of the valve must be below or equal to the permissible operating pressure of the hot
water cylinder. The valve protects the appliance against impermissible pressure or temperature rises. The
diameter of the cold water supply line must be no greater than the diameter of the valve.
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Ensure that the expansion water escaping from the valve can drip into a drain, e.g. a funnel, tundish.
Ensure the drain cannot be shut off.
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Size the drain pipe so that water can drain off unimpeded when the safety valve is fully opened.
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Ensure that the drain hose of the safety valve is open to atmosphere.
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Fit the safety valve drain pipe with a constant downward slope and in a location free from the risk of
frost.
Cold water expansion control valve (700
kPa)
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If specified, install a type-tested 700
kPa expansion control valve in the cold water supply line.
The safety valve protects the appliance against impermissible excess pressure. The diameter of the cold water
supply line must be no greater than the diameter of the safety valve.
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Ensure that the expansion water escaping from the safety valve can drip into a drain, e.g. a tank or
funnel.
Ensure the drain cannot be shut off.
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Size the drain pipe so that water can drain off unimpeded when the safety valve is fully opened.
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Ensure that the safety valve drain pipe is open to atmosphere.
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Fit the drain pipe of the safety valve with a constant downward slope and in a room free from the risk of
frost.
