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Green Storage WB Range
Installation & Maintenance Instructions
INSTALLATION INSTRUCTIONS
SECONDARY CIRCULATION CONNECTION
This can be used with secondary circulation. An appropriate WRAS approved bronze
or stainless steel circulator should be used in conjunction with a non-return valve to
prevent backflow.
On large secondary circulation systems it may be necessary to incorporate an extra
expansion vessel into the circuit to accommodate the increased system water volume.
A secondary return boss is fitted as standard on 210, 250 & 300 ltr units. On smaller
sizes, use a swept tee to connect into the cold feed pipe above the drain.
IMMERSION HEATERS
Only immersion heaters with a thermal cut-out that comply with BS EN 60335-2-73
may be used. To help ensure this, the immersion heaters have a special 13/4" thread.
They are rated at 3kW at 240V and are of a low noise incoloy construction.
They have both a thermostat and a high limit cut-out. Please order the correct
replacement via ourselves; fitting non-approved immersions may affect your
guarantee. When fitting, ensure the 'O' ring is positioned correctly on the head of the
immersion heater and lubricate before fitting. Fit it by hand until almost home then
tighten gently, as the 'O' rings will seal easily. Electrical supply refer to page 3.
Do not operate the immersion heater/s until the cylinder is full of water.
Do not operate the immersion heater/s if any sterilisation liquid is in the cylinder as
this will cause premature failure.
If the water quality is aggressive we recommend exchanging the immersion heater for
a titanium element.
Note: Immersion heaters should never be used as the primary heat source.
ELECTRICAL CONNECTIONS
Complete the wiring – use the appropriate wiring diagrams on pages 13-17.
6
(CONTINUED)
DISCHARGE ARRANGEMENT
You will need to position the inlet control group so that the discharge from both
safety valves can be joined together via a 15mm tee (see diagram below). Connect
the tundish and then connect and route the discharge pipe.
Ensure all pipes to and from the tundish are cut square, are free from burrs or
damage, and that the tundish if fitted vertically.
The discharge pipework must be routed in accordance with Part G3 of schedule 1 of
the Building Regulations. The information that follows is not exhaustive and if you are
in doubt you should seek advice.
Metal discharge pipe
(D1) from both safety
valves to tundish
1
600mm
MAXIMUM
3
300mm
MINIMUM
(Building Regulation G3 section 3.61
gives alternative points of discharge)
1) Expansion relief valve on inlet control set
2) Temperature & pressure relief valve on cylinder
3) Tundish
Note: The discharge will consist of scalding water and steam. Asphalt, roofing felt
and non-metallic rainwater goods may be damaged by such discharges.
Note: Although Building Regulations now permit the D2 pipe from the tundish to
be installed in soil stacks within premises, we do not recommend this, as discharge
from the temperature and pressure valve may continue for long periods of time.
It is the installer's responsibility to ensure the discharge pipework can support
the discharge for prolonged periods. If used, follow the guidance given in the G3
Building Regulations (mechanical seal without water trap). As discharge can be in
excess of 90°C, discharge into plastic pipework is also not recommended.
2
600mm
MAXIMUM
Discharge pipe (D2)
from tundish, with
continuous fall.
See Building Regulations
G3 section 3.56,
Table 4 & worked example
Discharge below fixed grating
4
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