5.16 Checklist before filling
Check Connections!
•
Flow and Return in correct positions?
•
All union nuts have been tightened, and a visual inspection expects them to be water tight.
•
All union nuts inside are tightened, and a visual inspection expects them to be water tight.
All isolation valves in the closed position
•
Safety valve discharge pipe to the safety valve.
•
Safety valve discharge pipe installation conforms to Building Regulations. (pipework to comply with current
Building regulations and refer to BS6798)
All drain valves and air vent valves are closed.
The HIU installation on the wall is secure and conforms to the instructions in 5.1 and 5.4
If a flush bypass kit has been installed, it is in the closed position
SECTION 5
-
Installation
Page 11
5.14 Flushing Bypass Kits
-
i
nstructions for
KIT A
•
See section 6, HIU wiring complete. HIU turned off to close the PICV.
•
All HIUs on this circuit must be flushed using this method at the same time.
•
Close the isolation valves as shown, and empty of water through the drain valve into a bowl.
•
remove test port plugs.
•
Install the kit adaptors making water tight seal on the O rings of the adaptors.
•
Fix the flushing pipe in position as shown, tighten the union nuts making a water tight seal with the fibre washers provided.
•
Open the isolation valves for system flushing.
•
When the flushing operation is finished, close the isolation valves as shown below, and empty water through the drain
valve again.
•
Now remove and clean the filter mesh by undoing and removing the filter cap.
•
Replace the now clean filter mesh, and replace the filter cap. This is part of commissioning section 8, part 4. Sign complete.
•
Remove and store the flushing pipe, replace the test plugs and make water tight. Do not over tighten on the O rings.
•
Fill the HIU, ready for commissioning.
5.14 Flushing Bypass Kits
-
i
nstructions for
KIT B
, as above, but the flush pipe and valve can be left in position.
Adaptors
and fibre
washers
Test ports with plugs
Close the Primary Isolation Valves
Drain
Filter cap
Flush pipe
5.15 Flushing Bypass Kits
-
instructions for
KIT C
.
•
Kit is to be assembled and installed at first fix stage, and the tees fitted to the primary isolation valves.
•
The flushing procedure is as above, but without the use of the test ports inside the HIU
On completion of flushing and during operation the bypass valve on Kit B and C must be shut and kept shut!
06/21 E&OE
