NTI Matrix M100 Installation And Operating Instructions Manual page 15

Matrix Installation and Operation Instructions
The gas valve is equipped with a throttle/input adjustment
screw. The input screw
ADJUSTED" without verifying proper combustion with a
calibrated combustion analyzer.
CAUTION
The Matrix is tested with Natural Gas having a heating value of 1020 BTU per cubic foot. For areas with
lower heating values, a combustion test is required to obtain optimum operation.
Using a calibrated flue gas analyzer, check the combustion and compare it with the acceptable requirements. The test should be
performed at maximum fan speed ("Gas Input Value").
Adjusting Combustion - Use the input screw to adjust the amount of gas available for combustion. Increasing gas increases CO
and CO . Reducing gas decreases CO and CO
2
CO – At maximum fan speed, the CO reading is
the most critical to the safe operation of the boiler.
The CO should be no higher than 175 PPM at any
condition. If the CO is over 140 PPM, the input
should be reduced until the CO is less than 140
PPM or the CO is reduced to 8% (9% for LP Gas).
2
If the CO is over 140 PPM and the CO
8% (9% for LP Gas), contact NTI for assistance.
CO – At minimum fan speed, should be checked, and the CO should be less than the reading recorded at high fan speed. The CO
at low fan speed must not be at least as high as the CO
Figure 5.3 Gas Input Screw Adjustment
Input Screw – Is a multiple turn needle
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 (after conversion is performed).
ATTENTION
IF FOR ANY REASON THE INPUT SCREW IS ADJUSTED, A "COMBUSTION ANALYZER" MUST BE USED TO
ENSURE SAFE AND PROPER OPERATION.
"MUST NEVER BE
.
2
Table 5.1 Normal Range of Combustion Products
*Note: On colder days CO
is less than
2
days it should be closer to the higher number. CO should be highest at the
maximum firing rate.
recorded at high fan speed, but not more then 9.5% (10.5% for LP Gas).
2
Figure 5.2 Setting Combustion
Manifold
Input Screw
(At maximum fan speed, 240)
Carbon Dioxide CO %
2
Carbon Monoxide CO ppm
NO ppm
X
should be closer to the lower number, on warmer
2
15
Gas IN
Air In
Line Pressure
Natural Propane
8-9.5* 9-10.5*
25-175* 25-175*
10-50 10-50
Input Screw Adjustment
Decrease gas
Turn Clockwise
Increase gas
Turn counterclockwise
2