Gas Connections - andrews COMBIflo 100/300 Installation, Operation And Maintenance Manual

4.15 GAS CONNECTIONS

4.15.1 GAS SUPPLY
The installation of the gas supply must conform, to the British Standards and Codes of Practice listed in Section
2.3 of this manual.
The gas meter, regulator and supply pipework must be sized so as to provide an adequate supply to the appli-
ance in addition to any other appliances connected to the supply (see 3.2 "V Maximum gas consumption" on P8)
for fl ow rate requirements.
A 1" male BSP threaded galvanised steel gas connection is provided on the left hand side of the appliance. A
minimum of 19mb running pressure, must be available at the appliance inlet, with this appliance and other con-
nected appliances operating at maximum load.
This will require a test point on the supply to the appliance. Alternatively the gas valve inlet on one
of the heat engines can be used, but a pressure loss of 2 - 2.5 mb across the valve must be allowed
for, when calculating the fi nal pressure drop.
Inlet pressure tapping
measurement point
4.15.2 GAS PIPE WORK
A manual valve for isolation of the gas supply to the appliance should be installed nearby and it should be
clearly identifi ed and readily accessible for use at all times. Where this appliance is installed in a plant room or
purpose built compartment, a manually operated valve must be fi tted in accordance with the Gas Safety (Instal-
lation and Use) Regulations. 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 (BS. 6891) in pipework to the appliance by connecting a manometer to the inlet pres-
sure tapping point.(See Fig. 4.1) Gas and combustion soundness within the appliance should be checked using
sense of smell and leak detection fl uid. Ensure gas tightness before moving onto commissioning.
ANDREWS COMBIfl o 32 GB