SECTION 9: GAS PIPING
WARNING
Fire Hazard
Tighten gas hose fittings to connect gas supply according to Figure 23.
Gas hose can crack when twisted.
Gas hose moves during normal operation.
Use only 36" (91 cm) long connector of 1/2" or 3/4" nominal ID.
Connector supplied with heater for U.S. models (not with Canadian models).
Failure to follow these instructions can result in death, injury or property damage.
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.
Install the gas hose as shown in Figure 23. 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 line. This can cause a gas leak resulting in an unsafe condition if the gas connection is not made in strict accordance with Figure 23.
Meter and service must be large enough to handle all the burners being installed plus any other connected load. The gas line which feeds the system must be large enough to supply the required gas with a maxi- mum pressure drop of 1/2" wc When gas piping is not included in the layout drawing, the local gas supplier will usually help in planning the gas piping.
Gas lines must meet applicable codes:
United States: The Flexible Stainless Steel Gas Hose (US models) supplied with the heater is certi- fied per the Standard for Connectors for Gas Appli- ances, ANSI Z21.24/CSA 6.10 - latest revision. Canada: The Rubber Type 1 Gas Hose (Canadian models) optional with the heater is certified as being in compliance with the Standard for Elastomeric Composite Hose and Hose Couplings for Conducting Propane and Natural Gas, CAN/CGA 8.1 - Latest revision.
•Check the pipe and tubing ends for leaks before placing heating equipment into ser- vice. When checking for gas leaks, use a soap and water solution; never use an open flame.
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