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43
SECTION 9: GAS PIPING
Warning
Fire Hazard
Tighten gas hose fittings to connect gas supply
according to “FIGURE 24: Gas Connection with
Flexible Gas Hose” on page 44.
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 on “FIGURE 24: Gas
Connection with Flexible Gas Hose” on page 44.
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 hose. This can cause a gas leak resulting
in an unsafe condition if the gas connection is not
made strictly in accordance with “FIGURE 24: Gas
Connection with Flexible Gas Hose” on page 44.
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 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 certified per
the Standard for Connectors for Gas Appliances,
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 service. When
checking for gas leaks, use a soap and water
solution; never use an open flame.
Summary of Contents for IRH
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