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a. Boiler (burner) is overfiring. CAUTION! National Fuel
Gas Code ANSI Z223.1-latest edition, does NOT per-
mit firing at a higher input rate than the input rate indi-
cated on the boiler rating plate in order to avoid haz-
ardous conditions such as explosion or carbon
monoxide poisoning.
b. Poor higher* heating value of gas is causing the actu-
a
l input to be substantially lower than the rating plate
i
ndication.
* “Higher heating value”of gas is commonly known as a “heating value.”
34 1.70
60 3.00
90 4.50
120 6.00
150 7.50
180 9.00
210 10.50
Boiler rated input in
cu.
ft./hr. of 1000 Btu/cu. ft.
Natural Gas
Cubic Feet
Gas Consumption
1000 Btu/cu. ft. gas, in 3
minutes, at rated input
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 per-
mitted.
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.
C. Main Burner Ignition Checkout and Pilot Adjustment.
1. The pilot flame must not smother or snuff out when test-
ed as follows:
a. Main burner ignition from cold start-repeat.
b. Continued operation of main burner.
c. Main burner ignition with appliance at maximum oper-
ating temperature after prolonged operation.
NOTE: Observe operation of the pilot burner with appli-
ance doors in the final operating position. Use of a mir-
ror may be helpful.
2. Safety Shutdown Checkout
a. For proper operation the pilot should engulf the thermo-
couple or flame sensor as shown below.
b. To adjust pilot, turn pilot flow adjustment screw on valve
clockwise or counterclockwise to give a steady flame
enveloping 3/8 to 1/2 inch of the tip of the thermocouple
or flame sensor. Note that turning the pilot adjust screw
c
lockwise will decrease the pilot flame.
c
. Check safety shutdown of gas valve by following procedure
outlined "CARE" and "MAINTENANCE" section.
Figure 15.
Figure 16.
WARNING: THE FLOW OF COMBUSTION AND VENTILAT-
ING AIR TO THE BOILER SHOULD NOT BE OBSTRUCTED.
This section must be brought to the attention of the owner by
the installer so that the owner can make the necessary
arrangements with a qualified service agency for the periodic
care and maintenance of this boiler. The installer must inform
the owner that the gas supplier can recommend a number of
qualified service agencies. The installer must also inform the
owner that the lack of proper care and maintenance of this boil-
er and any fuel burning equipment may result in a hazardous
condition.
1. GENERAL MAINTENANCE (Refer also to Owner’s
Information Manual)
These operations are recommended to be performed at reg-
ular intervals:
A. BOILER HEATING SURFACES: clean off all coatings
found.
B. BOILER CONTROLS: check contacts, settings, correct
functioning.
C. PIPING: check piping and accessories for leaks.
D. CHIMNEY VENTING SYSTEM: check for obstructions
and leaks.
E. BOILER ROOM AIR SUPPLY: check air vents for contin-
ued POSITIVE supply of air as required. Air needs are
greatest in cold weather. Air vents must be open and free
of obstruction.
F. WATER SYSTEM CHECK:
1. System to be full of water, and pressure to remain sta-
ble at correct setting on gauge.
2. Air control system: noise and air binding in radiation
should not occur
.
11
Sentr y
GAS RATE TABLE
The gas metered in 3 minutes to obtain rated input for each
boiler model, using 1000 Btu/cu. ft.gas, is tabulated in gas rate
table.
CARE AND MAINTENANCE