Gas Valve And Burner Set-Up - NTI Matrix Installation And Operation Instructions Manual

Matrix
9.0

GAS VALVE AND BURNER SET-UP

The Matrix gas valve must be set-up by a licensed Gas Technician. Improper set-up may
result in incorrect operation, damage to components or property, injury or death.
Gas Line Pressure
The boiler gas valve is equipped with a line pressure test port; see Figure 9-1. Use the following procedure to
measure the gas line pressure to the boiler to ensure if falls within the range given in Table 9-1:
1. Turn the supply of gas to the boiler 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 boiler. See Figure 9-1.
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 boiler and check for gas leaks.
5. Observe the line pressure under static conditions and compare it to Table 9-1. The pressure will be greatest
under static conditions.
6. With all other gas appliances in the applications running, operate the burner to the maximum firing rate (see
Table 9-2) and compare the observed line pressure with Table 9-1. The pressure will be lowest during the
maximum flow of gas.
7. Adjust the gas line pressure to ensure the parameters in Table 9-1 are attained under all conditions. If
possible adjust the line pressure to the "Nominal/Desired" value listed in Table 9-1, while the unit is
operating at the maximum modulation rate, see Table 9-2.
8. Continue observing the gas line pressure until the completion of the combustion analyses, incase
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 boiler
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 9-1 Line Pressure and Combustion Parameters
Gas
Nominal/Desired
Natural 7
11
Propane
Notes:
1
It is permissible to have higher CO
Table 9-2 Minimum and Maximum "Gas Input Values" (Modulation Rates)
Model Minimum Gas Input Value
M100, M100V
Carbon Monoxide - Never leave the boiler operating if emitting Carbon Monoxide (CO)
concentrations in excess of 175ppm. Failure to comply may result in injury of death.
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.
Line Pressure (inches wc)
Min.
4
8
values with the burner operating at the minimum modulation rate.
2
50
Installation and Operation Instructions
CO
Max. Min.
10.5 8.8
13 9.8
Maximum Gas Input Value
240
1
(%)
CO (ppm)
2
Max.
Max.
9.8 175
10.8 175
25