Tundish
Install the tundish in a vertical position within a maximum of 500mm from the Temperature and
Pressure Relief Valve drain connection. Ensure the expansion relief pipework discharges through the
tundish. Tundish pipework must be 22mm with a minimum vertical length of 300mm below the tundish.
Maximum permitted length of 22mm pipework is 9 m. Each bend or elbow is equivalent to 0.8m of
pipework.
All pipework must have continuous fall and discharge in a safe, visible position. If any doubt, refer to
Building Regulation G3.
MAINTENANCE
-6-
Annually a competent person should:-
· Inspect and clean the line strainer
· Re-commission the unit air-gap following the procedure described on page 4
· Check all valves for operation
· Complete Benchmark logbook
Pressure Reducing Valve
1. Isolate cold water supply.
2. Unscrew the retaing nut of the valve.
The complete operating mechanism,
including the strainer can be removed.
3. Clean the filter mesh and the cartridge
under running water.
4. Replace cartridge ensuring that strainer is
correctly located and reassemble the unit.
Pressure Reducing Valve cartridge and
strainer Part No. 510 501 2.1 Bar.
Expansion relief cartridge
1. Isolate cold water supply.
2. Unscrew blue expansion relief headwork
from valve body.
3. Clean valve seat face and seating - do not
scratch or damage either seat face or
seating.
4. Refit in reverse order. Do not overtighten
Expansion valve cartridge and seat Part
No. 214009 8.0 Bar. Complete Expansion
Valve Part No. 510 505 8.0 Bar.
Expansion valve
(Cartridge)
Part No.
8.0 Bar 214009
Expansion valve
Part No. 510 505
8.0 Bar
Pressure reducing valve
Cartridge and strainer
Part No. 100 510
2.1 Bar
