Installation guide

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INSTALLATION • SECTION 3
GAS SUPPLY – NATURAL GAS
The installation of the gas supply must conform,
depending on its size, to the requirements of British
Standards and Codes of Practice listed in Section 1 of
this manual.
A gas meter will be connected to the service pipe by
British Gas plc or its authorised contractor.
The meter and service pipe should be checked by British
Gas or its authorised contractor to ensure that they are
adequate to deal with the gas supply to the water
heater(s) in addition to any existing or additional
requirements.
Fit the service gas cock (supplied) to the gas connection
on top of the water heater using a suitable jointing
compound and connect to the gas supply.
Where the water heater(s) is(are) installed in a water
heater house or purpose built compartments, a manually
operated valve for the water heater house must be fitted
in accordance with the Gas Safety (Installation and Use)
Regulations 1998. The valve must be easily identified and
readily accessible.
After installation, the system should be pressure tested for
soundness and purged in accordance with BS6891 or
IM/2 and IM/5 as appropriate.
Please note that the minimum dynamic gas pressure for
Natural Gas must not fall below 18 mbar.
GAS SUPPLY – PROPANE
Contact your provider or supplier who will provide the
appropriate type and size of LPG supply vessel and
ensure its safe location and installation.
The installation of the gas supply must confirm to LGPA
Code of Practice, 22 LPG Piping Systems: Design and
Installation plus the requirements of British Standards and
Codes of Practice listed in Section 1 of this manual.
Andrews Water Heaters are unregulated and a second
stage regulator must be installed to give an inlet pressure
to the appliance as follows: (see fig 2)
PROPANE 37 mbar (14.86 in wg)
When using propane cylinders, connect a minimum of
47kg cylinders as listed below, together with a manifold
before connecting to the union.
Use a minimum pipe size of ¾" bore.
Two 47kg Cylinders LCWH30 and LCWH60
Three 47kg Cylinders LCWH90
Four 47kg Cylinders LCWH120
WARNING!
PROPANE CYLINDERS MUST BE USED AND
STORED IN ACCORDANCE WITH ‘THE HIGHLY
FLAMMABLE LIQUIDS AND LIQUIFIED
PETROLEUM GASES REGULATIONS 1972’ AND
SHOULD COMPLY WITH LPGA CODE OF PRACTICE
7: ‘STORAGE OF FULL AND EMPTY LPG
CYLINDERS AND CARTRIDGES’.
Also please note that for Propane the minimum dynamic
gas pressure to the unit must not fall below 37 mbar.
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