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TF-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL
44
SECTION 10: GAS PIPING Install the gas hose as shown on Page 45, Figure 23.
The gas hose accommodates expansion of the
heating system and allows for easy installation and
service of the burner. A 90° pipe elbow (not supplied)
must be installed into the gas valve to ensure proper
orientation of the flex gas connector. Before
connecting the burners to the supply system, verify
that all high pressu re 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 on Page 45.
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
maximum press
ure 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.
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.
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 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.