Ti Series Installation and Operation Instructions
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Trinity
23
8.0 GAS VALVE AND BURNER SET-UP
Set-up of the Trinity Ti gas valve must be performed by a licensed Gas Technician. Failure to perform
the set-up correctly may result in incorrect operation, component failure, property damage, serious
injury or death.
Gas Line Pressure
The appliance gas valve is equipped with a line pressure test port; see Figures 8-1. Use the following procedure to measure the
gas line pressure to the appliance to ensure if falls within the range given in Table 8-1:
1.
Turn the supply of gas to the appliance off.
2.
Open the bleed screw of the line pressure test port approximately 1-1/2 turns. This port is directly connected to the gas line
feeding the appliance.
3.
Force 1/4
ID tubing over the housing of the line pressure test port; install the other end of the tubing to an appropriate line
pressure test gauge or manometer. Ensure both ends of the tubing make a tight connection.
4.
Open the supply of gas to the appliance and check for gas leaks.
5.
Observe the line pressure under static conditions and compare it to Table 8-1. The pressure will be greatest under static
conditions.
6.
With all other gas appliances in the application running, operate the burner to the maximum firing rate (See Table 8-2) and
compare the observed line pressure with Table 8-1. The pressure will be lowest during the maximum flow of gas.
7.
Adjust the gas line pressure to ensure the parameters in Table 8-1 are attained under all conditions. If possible adjust the
line pressure to the "Nominal/Desired" value listed in Table 8-1, while the unit is operating at the maximum modulation
rate, see Table 8-2.
8.
Continue observing the gas line pressure until the completion of the combustion analyses, in case adjustments need to be
made.
9.
Upon completion of the line pressure testing, return the bleed screw of the Line Pressure Test Port to the closed position.
The line pressure is a function of the gas supply and is affected solely by field provided parameters
such as line size and regulator settings. Under no circumstances can the appliance gas valve influence
or be used to adjust the gas line pressure.
Failure to close the bleed screw of the Line Pressure Test Port will cause a severe leakage of gas,
resulting in a fire or explosion causing property damage, serious injury or death.
Table 8-1 Line Pressure and Combustion Parameters
Gas
Line Pressure (inches wc)
CO
2
(%)*
CO (ppm)
Max.
Nominal/Desired
Min.
Max.
Min.
Max.
Natural
7
4
10.5
8.5
9.5
175
Propane
11
8
13
9.5
10.5
175
*Note: it is permissible to have higher CO
2
values with the burner operating at the minimum modulation rate.
Table 8-2 Minimum and Maximum “Gas Input Values” (Modulation Rates)
Model
Minimum Gas Input Value
Maximum Gas Input Value
Ti100
50
240
Ti150
50
240
Ti200
40
240
Never leave the unit operating while producing Carbon Monoxide (CO) concentrations in excess of
175ppm. CO concentration will be greatest with the boiler operating at the highest firing rate, therefore
measure and make necessary adjustments with unit operating at the Maximum Gas Input Value, see Table 8-2. Failure to follow
this warning may result in serious injury or death.
DO NOT adjust or measure boiler Manifold Pressure as correct pressure is factory set. Field adjustment
could result in improper burner operation resulting in fire, explosion, property damage or death.
