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The gas connection tting is, 3/4” male NPT on
FTCF199 models.
The supply line must be sized for the maximum
output of the combination boiler model being
installed. If there are additional gas appliances
from the main supply line, you must measure
connected on the same main gas supply line,
according to the COMBINED total maximum
BTUH draw for the appliances as if they were
all operating at the same time.
Measure the length of the gas supply line from
the gas meter to the Combination boiler.
Use the tables in this manual or refer to the gas
line manufacturers sizing information to determine
the correct supply pipe size.
The manual gas shut-o valve in the gas supply
line should be installed close to the unit as shown
below.
CLOSED POSTION
UNION
FITTING
MANUAL SHUT OFF VALVE
GAS PIPE
Gas Line Shut O
Valve Detail
To facilitate any future maintenance, it is also
recommended that an approved gas union tting
be installed in the supply line between the shut-o
valve and the 3/4˝ male NPT connection on the
Combination boiler.
1) Install an approved gas line pipe to gas line
connection gas Combination boiler . Include
manual shut o valve and gas union on top of
the connection, as shown.
2) Test gas pressure to make sure it meets the
minimum standards and does not exceed the
maximum standards for the combination boiler.
3) Leak test the gas line pipe before placing the unit
in operation. Use approved leak detector liquid
solutions only to check for leaks.
Do Not Operate the combination boiler until all
connections have been completed, checked for
leaks, and the heat exchanger is lled with water.
4.11 Gas Supply and Piping (cont)
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