SECTION 12: GAS PIPING
SECTION 12: GAS PIPING
WARNING
Fire Hazard
Tighten gas line fittings to connect gas supply according to Figure 34.
Flex gas line can crack when twisted.
Gas line moves during normal operation.
Use only 1000 mm long connector of 1/2" or 3/4" nominal ID.
Failure to follow these instructions can result in death, injury or property damage.
hose. This can cause a gas leak resulting in an unsafe condition if the gas connection is not made in strict accordance with Figure 34.
Meter and service must be large enough to handle all the burners being installed plus any other connected load. The gas hose which feeds the system must be large enough to supply the required gas with a maximum pressure drop of 13 mm wc. When gas piping is not included in the layout drawing, the local gas supplier will usually help in planning the gas piping.
IMPORTANT - the complete installation must be tested for gas soundness and be purged in accordance with local and national codes.
•Check the pipe and tubing ends for leaks before placing heating equipment into
service. When checking for gas leaks, use a soap and water solution; never use an open flame.
WARNING
Explosion Hazard
Leak test all components of gas piping before operation.
Gas can leak if piping is not installed properly.
Do not high pressure test gas piping with heater connected.
Failure to follow these instructions can result in death, injury or property damage.
It is important that the gas supply pipe and electrical connections do not support any of the heater’s weight.
Installation pipes should be fitted in accordance with National Standards. Pipe work from the meter to the heater(s) must be of adequate size. Pipes of smaller size than the heater inlet gas connection should not be used.
Install the gas hose as shown on Page 54, Figure 34. The gas hose accommodates expansion of the heating system and allows for easy installation and service of the burner. Before connecting the burners to the supply system, verify that all high pressure testing of the gas piping has been completed.
There is an expansion of the tube with each firing cycle.
This will cause the burner to move with respect to the gas
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