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SECTION 11: GAS PIPING
41
SECTION 11: GAS PIPING
Install the gas hose as shown in Figure 25. 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 in strict accordance with Figure 25.
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" w.c. When gas piping
is not included in the layout drawing, the local gas
supplier will usually help in planning the gas piping.
• Do not high pressure test the gas piping with
the burner connected. Failure to follow these
instructions can result in property damage.
• 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.
FIGURE 25: Gas Connection with Flexible Gas Hose
WARNING
Fire Hazard
Tighten gas hose fittings to connect gas supply
according to Figure 24.
Gas hose can crack when twisted.
Gas hose moves during normal operation.
Failure to follow these instructions can result in death,
injury or property damage.
Fire Hazard
Tighten gas hose fittings to connect gas supply
according to Figure 25.
Gas hose can crack when twisted.
Gas hose moves during normal operation.
Failure to follow these instructions can result in death,
injury or property damage.
Horizontal
45°
Rear ViewBurner
2" (5 cm)
Flexible
Gas
Hose
Shut-Off Valve
(Included
With Gas Hose)
3/4" NPT Pipe
12"
(30 cm)
Shut-Off Valve must be
parallel to burner gas
inlet. The 2" (50 mm)
displacement shown is for
the cold condition. This
displacement may reduce
when the system is fired.
Description Part Number
1/2" Flexible Stainless Steel Gas Hose (US Models) 91412200
3/4" Flexible Stainless Steel Gas Hose (US Models) 91412203
1/2" Rubber (Type 1) Gas Hose (Canadian Models) 91412206
3/4" Rubber (Type 1) Gas Hose (Canadian Models) 91412207
Hold gas nipple securely with pipe
wrench when attaching the gas hose.
Failure to follow these instructions can
result in product damage.