Input Screw Adjustments; Combustion Calibration; Flue Gas Analysis And Adjustment - NTI TRINITY Ts80 Installation And Operation Instructions Manual

Ts Series
Decrease gas
Turn Clockwise
Adjustment
Input Screw Adjustments - The boiler is equipped with a Throttle/Input Adjustment Screw, located on the Gas
Valve and Venturi Assembly. It is used to adjust the flow of gas leaving the gas valve, which enters the Venturi
and then the combustion air stream. Turn the adjustment screw in (clockwise) to reduce the flow of gas, make
combustion leaner, and reduce the concentration of CO
gas in the combustion air stream, adjust the Throttle screw out (counterclockwise).
The input screw is a multiple turn valve. Fully open to close is approximately 17 turns. Typical adjustment for
Natural Gas is 0-1 full turns in or out. Typical adjustment for LP Gas is 0-3 full turns in or out. See Figure 9-1
for input screw location.
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 remain within the limits (Table 9-1). If not, do not adjust further, contact NTI for assistance.
2

Flue Gas Analysis and Adjustment

Each Trinity Ts 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.
View from Below
Line
Pressure
Test Port
Manifold
Pressure
Test Port
Orifice
Location
(Kit 82650-1)
Installation and Operation Instructions
Throttle/Input Adjustment Screw
in the flue gases. To increase the CO
2
and CO from Natural and Propane Gas burning boilers:
2
and CO; adjust as necessary, using the Throttle
2
Figure 9-1 Ts80 Orientation
Gas Valve and Venturi Assembly
Throttle/Input
Adjustment Screw
Increase gas
Turn Counter Clockwise
level and flow of
2
and CO levels are
2
Side View
Venturi
│
Trinity Ts
Gas Valve
Gas In
Air Intake
27