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Tx I&O Manual
Manifold Pressure - DO NOT adjust or measure the Manifold Pressure of the boiler.
Correct manifold pressure is factory set. Field adjustment could result in improper burner
operation resulting in fire, explosion, property damage or death.
Adjustments to the Throttle / Input Screw may only be made by a qualified gas
technician, while using a calibrated combustion analyzer capable of measuring CO
CO. Adjustments may only be performed if the gas line pressure is maintained above minimum levels
throughout the duration of the test, see Table 9-1. Failure to follow these instructions may result in serious
injury or death.
Decrease gas
Turn Clockwise
Adjustment
Throttle / Input Screw Adjustments - The boiler is equipped with a Throttle/Input Adjustment Screw, located
on the Gas Valve. It is used to adjust the flow of gas leaving the gas valve entering the Venturi and then the
combustion air stream. Turn the Throttle screw in (clockwise) to reduce the flow of gas, make combustion
leaner, and reduce the concentration of CO
increase the CO
level and flow of gas in the combustion air stream. Typical adjustment required is 0-1/2 full
2
turns in or out from the factory setting. See Figures 9-1 & 9-2 for Throttle screw location and Table 9-1 for
appropriate CO
levels.
2
Combustion Calibration - To calibrate burner operation, perform the following procedure using a calibrated
combustion analyzer capable of measuring CO
1. Operate the unit at the maximum modulation rate, see Table 9-2.
2. Ensure the gas line pressure is maintained within tolerance, see Table 9-1.
3. While at the maximum modulation rate, measure the CO
Screw, to be within the limits listed in Table 9-1.
4. Operate the unit at the minimum modulation rate (Table 9-2). Ensure the combustion remains smooth and
CO
and CO values are lower than the values obtained during maximum modulation (Table 9-1). If not, do
2
not adjust further, contact NTI for assistance.
Flue Gas Analysis and Adjustment
Each Trinity Tx is factory set to operate with Natural Gas, for boilers field converted to operate with Propane
Gas, a flue gas analysis and adjustment is mandatory. See Table 7-1 and Propane conversion instructions.
Failure to perform the flue gas analysis and adjustment detailed in this section may result
in erratic and unreliable burner operation, leading to reduced efficiency, increased fuel
consumption, reduced component life, heat exchanger combustion deposits, and general unsafe operation.
Failure to follow these instructions may result in serious injury or death.
Analysis – Perform flue gas analysis, and adjust throttle/input screw as required until CO
within acceptable limits.
Throttle/Input Adjustment Screw
in the flue gases. Turn the Throttle screw out (counterclockwise) to
2
and CO from Natural and Propane Gas burning boilers:
2
and CO; adjust as necessary, using the Throttle
2
│Gas Valve and Burner Set-up
Increase gas
Turn Counter Clockwise
and CO levels are
2
and
2
35
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