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TFTN 085-199
7.0 INSTALLING GAS PIPING
TFTN boilers are factory set to operate with Natural Gas; BEFORE OPERATING WITH PROPANE,
the boiler must be converted using the appropriate Natural Gas to LP Conversion Kit; see below.
Failure to properly convert the unit to safely operate with Propane will cause dangerous burner
operation, resulting in property damage, serious injury or death.
Table 7-1 Natural Gas to LP Conversion Kits
Boiler Model
TFTN085-110
TFTN150
TFTN199
TFTN285
TFTN340-399
Notes:
1
TFTN085-199 models are converted to Propane using a replacement LP-Mixer and Diaphragm insert, which are
provided in the respective Natural Gas to LP Conversion Kit; follow the instructions provided in the kit to
complete the conversion to LP.
2
TFTN285-399 models are converted to Propane by installing an LP-Orifice, which is provided in the respective
Natural Gas to LP Conversion Kit; follow the instructions provided in the kit to complete the conversion to LP.
Liquefied Petroleum (LP) propane gas is heavier than air. Do not install the boiler in a pit or similar
location that will permit heavier than air gas to collect. Check with Local Codes as they may require
boilers fueled with LP gas to be provided with an approved means of removing unburned gases
from the room. Failure to follow these instructions may result in serious injury or death.
Installation
Refer to the current National Fuel Gas Code ANSI Z223.1/NFPA 54 or CAN/CGA B149.1 installation codes, and local codes
for gas piping requirements and sizing. Pipe size running to the unit depends on:
• Length of pipe.
• Number of fittings.
• Type of gas.
• Maximum input requirement of all gas boilers in the residence.
Ensure that:
• The gas line connection to the boiler does not apply any weight to the gas valve. NTI recommends using approved
flexible gas piping (if acceptable by local codes) to connect the boiler to the gas supply (See Figure 7-1 for details).
• You plan the installation so the piping does not interfere with the vent pipe, or the removal of the valve, burner, and
serviceable components.
• The Boiler is installed such that the gas ignition system components are protected from water (dripping, spraying, rain
etc.) during installation and servicing.
• The gas piping is large enough for all the gas appliances in the home. No appreciable drop in line pressure should occur
when any unit (or combination of units) lights or runs. Use common gas-line sizing practices.
• Always use a pipe-threading compound that is resistant to Propane (LP) gas solvent action. Apply sparingly to all male
threads, starting at two threads from the end. Over doping or applying dope to the female end, can result in a blocked
gas line.
• DO NOT TIGHTEN FITTINGS WITHOUT SUPPORTING THE GAS VALVE as damage to the valve or blower motor can occur.
• Install a manual "Equipment Shut-Off Valve" as shown in Figure 7-1. Valve must be listed by a nationally recognized
testing laboratory.
• The gas line piping can safely be removed from the boiler for servicing, by strategically placing the gas line shutoff and
union; see example in Figure 7-1.
• All gas piping, including gas components in the boiler, are checked for leaks using a "Bubble Test", prior to operating
the boiler.
Natural Gas to LP Conversion Kit (part no.)
87752
87753
87740
87754
87755
Installation and Operation Manual
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