NTI Ti100-200 Installation And Operation Instructions Manual page 24

Trinity │Installation and Operation Instructions
Figure 8-1 Gas Valve Venturi Assembly
Gas Valve
Line Pressure
Manifold Pressure
Orifice Location
Gas Throttle / Input
Adjustment Screw
Venturi
Adjustment
Input Screw Adjustments - The appliance is equipped with a Throttle/Input Adjustment Screw, located on the Gas Valve and
Venturi Assembly. The Throttle screw is used to adjust the flow of gas leaving the gas valve, entering the Venturi and hence
entering the combustion air stream. By turning the adjustment screw in, clockwise, the flow of gas is reduced and the
combustion becomes leaner, thus reducing the concentration of CO
must be adjusted out, counterclockwise, thus increasing the flow of gas from the gas valve to the combustion air stream.
The Throttle/Input screw for models Ti100-200 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 from its factory position. Typical adjustment for LP Gas is 0-3 full turns in
or out from its factory position. See Figure 8-1 for screw location.
Decrease gas
Turn Clockwise
Adjustments to the Throttle screw may only be made by a qualified gas technician, while using a
calibrated combustion analyzer capable of measuring CO
may result in serious injury or death.
Adjustments to the Throttle screw may only be performed if the gas line pressure is maintained above
minimum levels throughout the duration of the test, see Table 8-1. Failure to follow these instructions
may result in serious injury or death.
24
Air Inlet
in the flue gases. To increase the CO
2
Throttle/Input Adjustment Screw
Increase gas
Turn Counterclockwise
and CO. Failure to follow these instructions
2
Ti Series
Gas Inlet
the Throttle screw
2