Section 10: Gas Piping - Roberts Gorden AG15ST Installation, Operation & Service Manual

SECTION 10: GAS PIPING

WARNING
Fire Hazard
Tighten gas line fittings to connect gas supply
according to Figure 19.
Flex gas line can crack when twisted.
Gas line moves during normal operation.
Use only 1000 mm long connector of 1/2" or
3/4" nominal ID.
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.
It is important that the gas supply pipe and electrical
connections do not support any of the heater's weight.
Installation pipes should be fitted in accordance with
National Standards. Pipe work from the meter to the
heater(s) must be of adequate size. Pipes of smaller size
than the heater inlet gas connection should not be used.
Install the gas hose as shown on Page 36, Figure 19. 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 19.
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 13 mm wc. When gas piping is not
included in the layout drawing, the local gas supplier will
usually help in planning the gas piping.
IMPORTANT - the complete installation must be tested
for gas soundness and be purged in accordance with
local and national codes.
• 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.
SECTION 10: G P
AS IPING
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