Roberts Gorden AG15ST, Installation, Operation & Service Manual

Page: 41 / 62

SECTION 10: G
AS
P
IPING
35
SECTION 10: GAS PIPING
It is important that the gas supply pipe and electrical
connections do not support any of the heater’s
w eight.
Installation pipes should be fitted in accordance w ith
National Standards. Pipe w ork 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 sho w n on Page 36, Figure 19 . The
gas hose accommodates expansion of the heating
system and allo
w s for easy installation and ser v ice of the
burner. Before connecting the burners to the supply
system,
v erify that all high pressure testing of the gas
piping has been completed.
There is an expansion of the tube w ith each firing cycle.
This w ill cause the burner to mo v e w ith 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
w ith Figure 19 .
Meter and ser v ice must be large enough to handle all the
burners being installed plus any other connected load.
The gas hose
w hich feeds the system must be large
enough to supply the required gas w ith a maximum
pressure drop of 13 mm w c. When gas piping is not
included in the layout dra w ing, the local gas supplier w ill
usually help in planning the gas piping.
IMPORTANT - the complete installation must be tested
for gas soundness and be purged in accordance
w ith
local and national codes.
• Check the pipe and tubin g ends for leaks before
placin g heatin g e q uipment into service. When
checkin g for g as leaks, use a soap and water
solution; never use an open flame.
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.