Table of Contents
Advertisement
WARNING
To prevent serious injury or death:
ALWAYS check the panel DIP SW2 #1 (Set of
●
8 Switches) is set according to the supply gas
type.
For natural gas, only install the gas orifice for
●
high altitude when the boiler is installed at
above 5,400 ft.
Be careful to install the NATURAL GAS HIGH
●
ALTITUDE CONVERSION KIT and not to
confuse it with the PROPANE GAS & HIGH
ALTITUDE CONVERSION KIT.
Failure to properly install the High Altitude
●
Conversion Kit or to not use the appropriate
Altitude Settings could cause carbon
monoxide poisoning, resulting in serious
injury or death.
15. Turn on the gas and water supply to the boiler.
16. Measure and adjust the gas/air ratio.
Option 1. Using Combustion Analyzer
(recommended)
a. Remove the analyzer port's cap.
b. Insert the analyzer into the port (Figure 7).
Figure 7. Insert the Analyzer
The DIP SW1 (Set of 6 Switches) on the circuit board
configures the operation status and model settings.
Model
Fuel
NG
NHB-055H
LP
NG
NHB-080H
LP
NG
NHB-110H
LP
NG
NHB-150H
LP
Table 2. CO
(CO
values must be within 0.5% of the values
2
listed.)
c. Activate multiple zones and set the boiler to
operate at 1-stage MIN mode.
For operation mode selection,
Note
refer to "11.13.7 Setting the
Special Operation Modes" on
page 118.
Measure the CO
2
If the CO
value is not within 0.5% of the
2
value listed in Table 2, the gas valve set
screw will need to be adjusted.
If adjustment is necessary, locate the set
screw as shown in Figure 8. Using a
or 4 mm Allen wrench, turn the set screw
no more than
/
turn clockwise to raise or
1
4
counterclockwise to lower the CO
Figure 8. Set Screw Location
The set screw is located behind
Note
the screw-on cover. This must be
removed first.
High fire
Low fire
%CO
%CO
2
2
8.9
9.5
10.2
10.8
8.9
9.5
10.2
10.8
8.9
9.5
10.2
10.8
8.9
9.5
10.2
10.8
value
2
value at low fire.
/
in
5
32
value.
2
Appendixes
125
Advertisement
Table of Contents
