Overhead Heat Exchanger Parallel Connection (Use As Solar Cylinder); Safety Equipment; Safety Valve; Pressurised Expansion Vessels - Dimplex WWSP 885S Instructions De Montage Et D'utilisation

4.4
4.4 Overhead heat exchanger parallel connection
(use as solar cylinder)
5

Safety equipment

5.1 Safety valve

Every closed water heater with up to 5000 l nominal capacity is
to be equipped with a component-tested, spring-loaded dia-
phragm safety valve. A shut-off device must not be installed be-
tween the cylinder and the safety valve. The use of dirt traps or
other restrictions in the line to the safety valve is also prohibited.
The installation height of the safety valve must be selected in
such a way that enables the discharge pipe, which is to be sub-
sequently connected, to be installed at a gradient. It is advanta-
geous to arrange the safety valve above the domestic hot water
cylinder so that it can be replaced without drainage.
Nominal inlet and outlet diameters of the safety
valves for closed water heaters
Nominal volume Valve size
in litres in DN min.
up to 200 15 (R/Rp1/2")
over 200 to 1,000 20 (R/Rp3/4")
over 1,000 to 5,000 25 (R/Rp 1")
GB-6
The nominal diameters of the discharge pipe and the outlet cross
section of the safety valve must be equal in size. A warning sign
should be affixed near to the discharge pipe (on the safety valve
itself is advisable):
"Water may escape from the discharge pipe during heating! Do
not close!

5.2 Pressurised expansion vessels

According to DIN 4807-5 closed expansion vessels with dia-
phragms can be integrated into the cold water line of closed
water heaters.
5.3 Thermal discharge safety
Heat output
in kW max.
75
150 These are to be used for closed water tanks which are heated di-
rectly with solid fuels (wood, briquettes, coal, etc.).
250
devices