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Jaguar Model J-390
37
IV. CHECK COMBUSTION AND FUEL INPUT RATE
A. Start and run the burner at the high firing rate, by using the
“System Test” mode in the “View and changing system
setting” menu. Refer to Table 5 on page 33.
1. Measure the CO, and CO
2
of the flue gas. A
flue sample port is provided in the vent pipe (See
Figure 2 on page 3). The CO should not exceed 100
ppm, when the combustion is correct. The CO2 is not
field adjustable, and should be in the range of 8.5% to
9.5% (9.0% is the nominal reading). Record the actu-
a
l high firing rate CO2, as it will be used as a refer-
e
nce in setting the low firing rate CO2 (in Step B).
2. Once the correct combustion is confirmed at the
high firing rate, check the fuel input rate on the
gas meter.
BTUH INPUT = cu. ft. metered in 3 minutes x
heating value of the gas* x 20
* The higher heating value of the gas can vary for
different localities. Consult the gas supplier for this
value in BTU/cu.ft.
3. If the fuel input is not at the rate specified on page 2
at the high firing rate, then the blower speed should
be adjusted to attain the specified input rate. This can
be done by using the “Change blower RPM for high
input” mode in the “View and changing System
Setting” menu. Refer to Table 5 on page 33. Increas-
ing the blower rpm will increase the fuel input rate,
and decreasing the blower rpm will decrease the fuel
input rate.
B. In the “System Test” mode in the “View and Changing
System Setting” menu, use the “down” push button to
switch to the low firing rate. Refer to Table 5 on page 33.
1. Measure the CO and CO
2
of the flue gas. The CO
should not exceed 30 ppm, when the combustion
is correct. The CO
2
should be 0.2% lower than the
high firing rate CO
2
(recorded in Step A). If this
reading is obtained, then proceed to Step 4.
2. If the CO
2
is not 0.2% at the low firing rate, then the
gas valve needs to be accessed for proper adjust-
ment. Remove the boiler jacket top cover, 3 front
cover panels, and enclosure front cover (see figure 2
on page 3 for locations.
3. Remove the cap that covers the gas valve offset
screw (see figure 25 for location). Adjust the low fire
CO
2
to be 0.2% lower than the recorded high fire
CO
2
. Turn the offset clockwise to increase the CO
2
v
alue. Turn the offset counter-clockwise to decrease
t
he CO
2
v
alue. Replace the offset cap when adjust-
m
ent is complete.
4. Once the correct combustion is confirmed at the
low firing rate, check the fuel input rate of the gas
meter. BTUH Input = cu. ft. metered in 3 minutes x
heating valve of the gas * x 20.
5. If the fuel input is not at the rate specified on page 2
at the low firing rate, then the blower speed
should be adjusted to attain the specified input rate.
This can be done by using the “Change blower RPM
f
or low input” mode in the “View and changing
System Setting” menu. Refer to Table 5 on page 33.
Increasing the blower rpm will increase the fuel input
rate, and decreasing the blower rpm will decrease the
fuel input rate.
6. Replace the boiler enclosure front cover, 3 jacket front
cover panels, and top cover (see figure 2 on page 3
for locations).
C Exit the “System Test” mode, once the combustion and fuel
input rate has been checked and adjusted, if necessary.
Refer to Table 5 on page 33.
INLET
PRESSURE TAP
OUTLET
PRESSURE TAP
GAS VALVE
VENTURI
COMBUSTION
BLOWER
GAS PIPE
OFFSET ADJUSTMENT
SCREW (BELOW CAP)
Figure 25. Gas valve adjustment.