Gas Connections - Smith XWH 150 Instruction Manual

GAS CONNECTIONS

CONNECTING GAS SUPPLY PIPING
1. Remove the top access panel and refer to Figure's 61 thru 64
to pipe gas to the water heater.
a. Install ground joint union for servicing, when required.
b. On Models 150 - 400 install a manual shutoff valve in the
gas supply piping outside water heater jacket when required
by local codes or utility requirements.
2. Install sediment trap / drip leg.
Water heater system piping MUST be sized per the
pipe requirements listed in Table 22. Reducing the pipe
size can restrict the flow rate through the water heater,
causing inadvertent high limit shutdowns and poor system
performance.
3. Support piping with hangers, not by the water heater or its
accessories.
Figure 61. Gas Supply Piping - Models 150 - 200
Figure 62. Gas Supply Piping - Models 285 - 400
Figure 63. Gas Supply Piping - Models 500
Figure 64. Gas Supply Piping - Models 600 - 800
The gas valve and blower will not support the weight of the
piping. Do not attempt to support the weight of the piping with the
water heater or its accessories. Failure to comply could result in
severe personal injury, death, or substantial property damage.
4. Purge all air from the gas supply piping.
5. Before placing the water heater in operation, check the water
heater and its gas connection for leaks.
a. The appliance must be disconnected from the gas supply
piping system during any pressure testing of that system at a
test pressure in excess of 1/2 PSIG (3.5 kPa).
b. The appliance must be isolated from the gas supply piping
system by closing a manual shutoff valve during any pressure
testing of the gas supply piping system at test pressures
equal to or less than 1/2 PSIG (3.5 kPa).
c. The appliance and its gas connection must be leak tested
before placing it in operation.
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