Installation Instructions - Benchmark Green Storage WB Series Installation & Maintenance Instructions Manual

Green Storage WB Range
Installation & Maintenance Instructions

INSTALLATION INSTRUCTIONS

HOT OUTLET
SECONDARY RETURN CIRCUIT
( 210, 250 & 300 L SIZES )
NON
BRONZE RETURN
PUMP VALVE
2 PORT
VALVE
BOILER
FLOW
BOILER
RETURN
IMMERSION
HEATER
COLD MAINS PIPEWORK
Run the cold mains through the building to the place where the unvented cylinder 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 minimised. Identify the cold water supply pipe and fit an
isolating valve (not supplied).
We recommend using a full bore 22mm quarter turn ball valve, alternatively a
22mm stopcock can be used, however this may reduce the flow rate. Do not use a
"screwdriver slot" or similar service valve.
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 sufficient draining of
the 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 flow.
Select a suitable position for the expansion vessel. Mount it to the wall using the
bracket attached to the vessel. Use suitable fittings 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
BS EN1057-R250 copper tube to these connections.
Cut the tube square using a rotary tube 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
4
TEMPERATURE
& PRESSURE
RELIEF VALVE
TUNDISH
NON
RETURN
VALVE
DUAL
STAT
COLD
INLET VIA
DRAIN
EXPANSION
RELIEF
VALVE
PRESSURE
ISOLATING
REDUCING
VALVE
VALVE
BALANCED
COLD
CONNECTION
EXPANSION
VESSEL
WITH WALL
BRACKET
Turn to test
Expansion Relief
to Tundish
the outer wall of the olive with plumbing paste and tighten the gland nut in the
prescribed manner. Upon filling/commissioning, ensure all connections are completely
watertight, including immersion bosses and any pre-plumbed pipework if applicable.
Note: No control or isolation valve should be fitted between the expansion relief
valve and the storage cylinder. The relief valve connections should not be used for
any other purpose.
Notes:
The pressure reducing valve, non-
return valve and expansion relief valve
are combined together in the inlet
control set.
On 120 – 180 litre sizes there is no
dedicated secondary return boss and
the secondary return circuit should be
tee'd into the cold feed pipe just above
the drain elbow.
COLD
MAIN
Cold Mains In
Outlet to Cylinder
Balanced Cold
Connection