73
(F) Temperature and Pressure Relief Valve
20
The Temperature and Pressure Relief Valve
20
need
appropriate discharge pipework. In accordance with
Building Regulations a tundish must be fitted into the
pipework within 600mm of the safety device. Due to
the distance between the two safety devices it may be
necessary to fit each safety device with its own
tundish before run the pipework together to a safety
discharge. The Right Plate
17
has a window so that
the connection can be made to the factory fitted
Temperature and Pressure Relief Valve
20
. For
access, first remove the 4 screws on the Access Plate
21
. Then connect the Temperature and Pressure
Relief Valve
20
to the discharge pipework (Ø15mm).
Finally, reinstall the Access Plate
21
. Always replace
the plate so that no gaps exist between the plate and
Right Plate
17
to avoid heat loss. The following
instructions are a requirement of UK Building
Regulations and must be adhere to. For the other
countries please refer to local legislation. If there is
any doubt the insulation procedure, always contact
local building office.
Cold water supply
Safety valve
>300mm
<
6
0
0
m
m
<600mm
Pressure reducing valve
(field supply)
Expansion vessel
(field supply)
Inlet pipe
Drain valve
(field supply)
Tee Joint
(field supply)
Tee Joint
(field supply)
Tundish
(field supply)
1. Connect the tundish and route the discharge pipe
as shown above. Tundish should be visible and
positioned away from frost environment and
electrical components.
2. The tundish should be fitted vertically and as
close to the safety device as possible and within
600mm of the device.
3. The tundish should be visible to users and
positioned away from electrical devices.
4. The discharge pipe from the tundish should be
terminate in a safe place where there is no risk to
person nearby to the discharge, be of metal
construction and:
Be at least one pipe size larger than the
nominal outlet size of the safety device unless
its total equivalent hydraulic resistance
exceeds that of a straight pipe 9m long.
Bends must be taken into account in
calculating the flow resistance.
Have a vertical section of pipe at least 300mm
long, below the tundish before any elbows or
bends in the pipework.
Be installed with a continuous fall.
Have discharges visible at both the tundish
and final point of discharge.
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