General Installation; Cold Mains Piperwork; Connecting To The Cylinder - EHC NEPTUNE NINDSL90L Installation & Maintenance Instructions Manual

05
EHC NEPTUNE
UNVENTED HOT WATER CYLINDERS

GENERAL INSTALLATION

COLD MAINS PIPEWORK
Run the cold main through the building to the place where
the EHC Neptune is to be installed. Take care not to run the
cold pipe near hot water or heating pipework so that the
heat pick-up is minimized. Identify the cold water supply pipe
and it an isolating valve (not supplied).
A 22mm BS1010 stopcock can typically be used but a 22mm
quarter turn full bore valve would be better as it does not
restrict the low as much. Do not use "screwdriver slot" or
similar valves. Make the connection to the cold feed of the
cylinder and incorporate a drain valve. Position the drain
valve no higher than the cold inlet to ensure suficient
draining of cylinder when required. Position the inlet control
just ABOVE the Temperature & Pressure Relief Valve (TPRV)
mounted on the side of the cylinder. This ensures that
the cylinder does not have to be drained down in order to
service the inlet control set. Ensure that the arrow points
in the direction of the water low. Select a suitable position
for the expansion vessel. Mount it to the wall using the
bracket attached to the vessel. Use suitable ittings capable
of supporting full vessel weight (and with appropriate
consideration to wall material). Connect the expansion
vessel to the cold feed pipework between the inlet control
set and the cold inlet on the cylinder. Ensure that the top of
the vessel is accessible for servicing.

CONNECTING TO THE CYLINDER

All of the pipework connections on the cylinder are 22mm
compression and supplied complete with gland nuts and
olives, in the Accessory Kit box. Only connect 22mm Table X
copper tube to these connections.
Cut the tube with a pipe cutter and ensure no sharp edges or
burrs protrude. Slide both gland nut and olive onto the tube
and push tube fully home into the connection, ensuring the
tube end fully bottoms on the connection recess. Smear the
outer wall of the olive with plumbing paste and tighten gland
nut in the prescribed manner. Upon illing/commissioning,
ensure all connections are completely watertight. Note:
No control or isolation valve should be itted between the
expansion relief valve and the storage cylinder. The relief
valve connections should not be used for any other purpose.
Turn to
test
Cold
Mains In
Balanced Cold
Connection
(expansion vessel not to scale)
Expansion
Relief
Connection
Expansion
Relief to
Tundish
Outlet to Cylinder