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XIV. System Start-up(continued)
6. Verify O
(or CO
) and CO concentration are within
2
2
limits specified in Table 37. Note: the values in
this table are for sea level only. For high altitude
installation, above 2000 ft. consult factory.
Figure 33: Gas Valve Air/Fuel Adjustment
Table 37: Combustion O
Natural Gas
AMP
CO
%
O
Model
2
8.4-9.5
4.0-6.0
1000
8.4-9.5
4.0-6.0
1250
8.4-9.5
4.0-6.0
1500
8.4-9.5
4.0-6.0
2000
8.4-9.5
4.0-6.0
2500
8.4-9.5
4.0-6.0
3000
8.4-9.5
4.0-6.0
3500
8.4-9.5
4.0-6.0
4000
Throttle Screw for
High Fire Adjustment
Offset Screw for
Low Fire Adjustment
/CO
Levels
2
2
LP Gas
%
CO
%
O
%
2
2
2
9.8-11.1
4.0-6.0
9.8-11.1
4.0-6.0
9.8-11.1
4.0-6.0
9.8-11.1
4.0-6.0
9.8-11.1
4.0-6.0
9.8-11.1
4.0-6.0
9.8-11.1
4.0-6.0
9.8-11.1
4.0-6.0
C. Combustion Air/Fuel Adjustment
1.
For high fire adjustment
a. Lock the appliance in high fire and allow fan speed
and combustion analyzer reading to stabilize
before taking combustion readings. To lock in
high fire, select MAIN MENU >> OPERATION.
Select lock symbol, type password and select
ENTER. From the Operation screen, select
Automatic / Manual Firing Rate Control >>Manual
Modulation. Go back to Operation screen. Then
select High Low >> High.
b. Once high fire rate is reached, adjust the O
at high fire with all the jackets, including the front
cabinet door, closed.
c. For appliances specified to be less than 20 ppm
NOx adjust O
(Natural gas).
d. If high fire O
decrease O
2
screw towards the "Plus (+)" sign in 1/4 turn
increments and checking the O
each adjustment. Refer to Figure 33 for location
of throttle screw. Verify CO air free is less than
200 ppm.
2. For low fire adjustment
a. Lock appliance in low fire and allow fan speed and
combustion analyzer reading to stabilize before
taking combustion readings. To lock in low fire,
select High Low >> Low.
b. If low fire O
2
O
(decrease CO
2
towards the "Minus (-)" sign in less than 1/8 turn
increments and checking the O
each adjustment. Verify CO concentration is less
than 200 ppm.
c. If low fire O
2
O
(increase CO
2
towards the "Plus (+)" sign in 1/4 turn increments
and check O
Verify CO air free is less than 200 ppm.
d. Verify O
repeatability by modulating to high and
2
low fire three times.
e. Once the appliance is operating within the
specified high and low fire ranges, record
emissions, flue draft, and other important data.
f.
Compare emission data to the factory emissions
report posted on the back of the front jacket
panel.
3. Return the appliance to Automatic Mode. From
Operation screen, select Automatic / Manual Firing
Rate Control >> Automatic Modulation. Select
HOME to return to the Home Screen.
70
level to approximately 6.0%
2
is too high (CO
is too low),
2
2
(increase CO
) by turning the throttle
2
(or CO
2
is too low (CO
is too high), increase
2
) by turning the offset screw
2
(or CO
2
is too high (CO
is too low), decrease
2
) by turning the offset screw
2
(or CO
) after each adjustment.
2
2
level
2
) after
2
) after
2
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