Tx Series Installation and Operation Instructions
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Trinity
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7.0 INSTALLING GAS PIPING
The Trinity Tx is factory equipped to operate with Natural Gas, the installation of a
conversion kit is required prior to operating with Propane Gas. The Natural to LP
Conversion Kit (see Table 7-1) must be installed prior to installing the gas piping to the boiler. Failure to
properly convert the unit to operate with Propane may result in property damage, serious injury or death.
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.
Table 7-1
Natural to LP Propane Conversion Kit
Model
Kit Number
Orifice Number
Tx51
84867-1
3.5
Tx81
84867-2
3.8
Tx101
84867-3
4.2
Tx151, Tx151C
84867-4
5.05
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.
Strain on the gas valve and fittings may result in vibration, premature component failure
and leakage and may result in a fire, explosion, property damage, serious injury or death.
Do not use an open flame to test for gas leaks. Failure to follow these instructions may
result in fire, property damage, serious injury or death.
When performing a pressure test on the gas line piping, be sure the boiler is disconnected
or isolated if the test pressure is expected to exceed 1/2 PSI (14” w.c.), as damage to the
gas valve could occur resulting in
fire, property damage, serious injury or death.
