Installation guide

INSTALLATION SECTION 3
The installation of the gas supply must conform, depending on it's 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 it's authorised
contractor.
The meter and service pipe should be checked by British Gas or it's 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.
The water heater is not intended for operation at higher than 35mbar (14.0 in wg) supply
gas pressure. Higher gas supply pressures require supplemental reducing service
regulation. Exposure to higher gas supply pressure may cause damage to the gas
controls, which could result in fire or explosion. If overpressure has occurred such as
through improper testing of gas lines or emergency malfunction of the supply system, the
gas valve must be checked for safe operation.
Where the water heater(s) is(are) installed in a water heater house or purpose built
compartment, 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 BS 6891 or IM/2 and IM/5 as appropriate.
GAS SUPPLY
NATURAL GAS
Contact Calor Gas who will provide the appropriate type and size of LPG supply vessel
and ensure it's safe location and installation.
The installation of the gas supply must conform to LPGA Code of Practice, 22 LPG Piping
Systems: Design and installation plus the requirements of British Standards and Codes of
Practice listed in Section 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:
PROPANE: 37mbar (14.86 in wg)
When using propane cylinders, connect a minimum number of 47kg cylinders as listed
below, together with a manifold before connecting to the union.
Use a minimum pipe size of
3
⁄4in bore.
Two 47kg Cylinders LEC230/600, LEC230/700 AND LEC380/740
Three 47kg Cylinders LEC230/960 AND LEC380/980
Four 47kg Cylinders LEC380/1220 AND LEC380/1400
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’.
GAS SUPPLY
PROPANE
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