andrews MAXXflo - GAS SUPPLY - NATURAL GAS; GAS SUPPLY - PROPANE

MAXXo Water Heater
1414
GAS SUPPLY – NATURAL GAS
e 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.
e 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 plant room or purpose built compartments, a
manually operated valve for the water heater house must
be tted in accordance with the Gas Safety (Installation
and Use) Regulations. e valve must be easily identied
and readily accessible.
After installation, the system should be pressure tested for
soundness and purged in accordance with BS6891 or IGE/
UP/1A or 1B 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.
e installation of the gas supply must conrm to UKlpg
Code of Practice 22 - Design, Installation and Testing
of LPG piping systems, 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 g 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
ree 47kg Cylinders LCWH90
Four 47kg Cylinders LCWH120
Propane cylinders must be used and stored in
accordance with “e highly ammable liquids
and liquied petroleum gases regulations” and
should comply with UKlpg code of practice 7
“Storage of full and empty LPG cylinders and
Cartridges”.
Please note that for Propane the minimum
dynamic gas pressure to the unit must not fall
below 35 mbar.
SECTION 3 • INSTALLATION