Roberts Gorden HE40UT Manual Do Utilizador

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B
LACKHEAT
®
 HE I
NSTALLATION
 O
PERATION
 
AND
 S
ERVICE
 M
ANUAL
52 of 73
SECTION 12: GAS PIPING
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 showon Page 53, Figure 32. Th
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 32.
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.
WARNING
Fire Hazard
Tighten gas line fittings to connect gas supply 
according to Figure 32.
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.