6
1.6 Gas Connection and Supply
The gas connection on the heater is ½”N.P.T
external thread.
Injector sizes and manifold pressure for the
burners are shown in the table 3. The gas
supply piping and connections must be installed
so that the minimum pressure stated is
achieved.
A gas shut off valve and union should be fitted
in the gas supply line close to the heater and a
⅛
” N.P.T plugged tapping, accessible for test
gauge connection, provided immediately
upstream of the appliance gas inlet.
It is essential to provide some flexibility in the
final gas connection preferably by use of an
approved flexible gas connector or stainless
steel expansion loop.
Take care when making a gas connection
to the heater not to apply excessive turning
force to the internal controls.
Depending on the specific installation, the
flexible gas hose may be routed to the gas cock
at any of the following angles in relation to the
burner:
Care must be taken to observe the minimum
pipe bend diameter (minimum 10”, maximum
14”) & pipe expansion distance (minimum 1
⅛
”,
maximum 3¾”).
The correct installation as shown will allow
for approx 4” of movement due to expansion.
WARNING:
Before installation, check
that the local distribution conditions,
nature of gas and pressure, and adjustment
of the appliance are compatible.
Figure 3. Correct orientation of Ball Valve
Gas Flow
Gas Flow
Figure 4. Correct Installation of Flexible
Gas Connection
WARNING:
CONNECTOR MUST BE INSTALLED IN A “U” CONFIGURATION. USE
ONLY THE 24” LONG CONNECTOR OF ½” NOMINAL ID THAT WAS
FURNISHED WITH THIS HEATER.