Gas Connections - andrews MAXXflo EVO Installation And Maintenance Manual

4.9 GAS CONNECTIONS

4.9.1 GAS SUPPLY
The installation of the gas supply must conform, to the Standards and Codes of Practice listed in Section 2.3
of this manual.
This water heater is intended to be installed only on a gas supply with a governed meter.
The gas meter, regulator and supply pipework must be sized so as to provide an adequate supply to the
heater in addition to any other appliances connected to the supply (see 3.3 for gas consumption rates).
A 3/4" BSP threaded isolation valve with inlet pressure measuring point is supplied with the heater, to provide
a union connection at the top right hand rear of the heater. A minimum of 19mb gas pressure, must be avail-
able at the heater inlet, with this heater and other appliances connected to the same gas supply, operating at
maximum load.
Note: when replacing a MAXXfl o with a MAXXfl o EVO and reusing the existing gas isolation valve and fi t-
tings, remove the new ¾" Gas Union (MxF) from the MAXXfl o EVO, and replace it with 1" X ¾" Reducing
Socket (George Fischer Part/N 770 240 225)
4.9.2 GAS PIPE WORK
Where this heater is installed in a plant room or purpose built compartment, a manually operated valve must
be fi tted. The valve must be easily identifi ed and readily accessible.
The gas supply pipework should be fi tted with suitable unions so the heater can be safely removed for major
service or repair.
Check for gas tightness in pipework to the heater by connecting a manometer to the inlet pressure tapping
point. Gas and combustion soundness within the heater should also be checked using sense of smell and
leak detection fl uid. Ensure gas tightness before moving onto commissioning.
Installation
In In Inlet pressure tapping
m m measurement point
U U Union connection
36
I I s Isolation valve
MAXXfl o EVO