Burner Adjustment, Checking Gas Input - Slant/Fin SENTINEL Installation And Operating Instructions Manual

Sentinel
Figure 11. Valve VR8204 or VR8304
Figure 12.
cian or gas supplier
To Turn Off Gas To Appliance
1. Set the thermostat to lowest setting.
2. Turn off all electric power to the appliance if service is to be
performed.
3. Remove control access panel.
4. Turn gas control knob clockwise
then continue to "OFF". DO NOT force.
5. Replace control access panel.
III. BURNER ADJUSTMENT
A. Adjust gas input rate:
1. Consult gas supplier for higher* heating value of gas –
W/m (Btu/cu.ft.)
3
2. Set thermostat high enough so that boiler will remain on
while checking rate.
3. Measure manifold pressure at 1/8" tapping. Cor rect
manifold pressure for gas used is printed on boiler rat-
ing plate. NOTE: Gas pressure may be adjusted by turn -
ing pressure regulator screw on combination gas valve
(turn clockwise to increase pressure, counterclockwise
to decrease pressure).
a. Input for PROPANE is approximately at rating shown
on rating plate when manifold pressure is 241 mm
(9 1 / ") water column.
2
b. Input for NATURAL GAS is approximately at rating
when manifold pressure is 89 mm (3
umn, but should be checked on the gas meter:
Input = W/m 3 × m
(Input = Btu/cu. ft. x cu. ft. metered in 3 minutes x
20)
until knob stops,
/ ") water col-
1
2
3 metered in 3 minutes × 20
Example #1:
For 8.29 W/m gas, this becomes:
3
Input = m metered in 3 minutes × 8.29 × 20
3
(For 1000 Btu/cu.ft. gas, this becomes:
Input = cu. ft. metered in 3 minutes × 1000 × 20)
Example #2:
For 8.70 W/m gas this becomes:
3
Input = m metered in 3 minutes × 8.70 × 20
3
(For 1050 Btu/cu.ft. gas, this becomes:
Input = cu. ft. metered in 3 minutes × 1050 × 20)
4. The higher heating value* of gas varies substantially for
different localities. Consult with Slant/Fin's Technical
Service Dept. for re-orificing procedures if any of the
following apply:
a. Boiler (burner) is overfiring. CAUTION! National Fuel
Gas Code ANSI Z223.1-latest edition or CSA
B149.1-00 for natural gas and propane, does NOT
permit firing at a higher input rate than the input rate
indicated on the boiler rating plate in order to avoid
hazardous conditions such as explosion or carbon
monoxide poisoning.
b. Poor higher heating value* of gas is causing the
actual input to be substantially lower than the rating
plate indication.
* "Higher heating value" of gas is commonly known as a "heating value."
The gas metered in 3 minutes to obtain rated input for each
boiler model, using 8.29 W/m
below:
BOILER RATED INPUT
8.29 W/m (1000 Btu/cu. ft.)
3
Natural Gas
m 3 /hr cu.ft./hr.
1.98 70
2.97 105
3.96 140
4.95 175
5.94 210
6.93 245
B. Main Burners
1. Fire the boiler continuously for at least 15 minutes, to reach
burner operating temperature.
2. Observe the flames, all burners. The base of all flame jets
should be blue. The tips should be blue shading to orange.
NOTE: Dust, disturbed by any movement, will cause bright
orange flames. Wait for dust to settle.
3. For one burner, close the air shutter until some of its flame jet
tips turn yellow-white, indicating insufficient primary air. Then
open shutter until whitish tips disappear completely. Set all
burner shutters to the same opening. Observe to make sure
that no yellow-white tips appear over any portion of the
flame. Small yellow tips at the pilot location are permitted.
NOTE: This adjustment method gives MINIMUM primary air
setting for safe combustion. DO NOT attempt to make this
adjustment unless burners are at operating temperature.
Adjustment should be made with burner access panel in
final operating position. Use of a mirror may be helpful to
observe flames. Note that burner ports are on top of main
burner tube.
3 (1000 Btu/cu.ft.) gas is tabu lated
GAS CONSUMPTION
8.29 W/m (1000 Btu/cu. ft.)
3
in 3 minutes, at rated input
m 3 cu.ft.
0.099 3.50
0.149 5.25
0.198 7.00
0.248 8.75
0.297 10.50
0.347 12.25
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