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b. Input for NATURAL GAS is approximately at rating when
manifold pressure is 3-1/2" water column, but should be
checked on the gas meter:
Btuh Input = Btu/cu. ft. x cu. ft. metered
in 3 minutes x 20
Example #1:
For 1000 Btu/cu.ft. gas, this becomes:
Btuh Input = cu. ft. metered in 3 minutes
x 1000 Btu/cu.ft. x 20
Example #2:
For 1050 Btu/cu.ft. gas, this becomes:
Btuh Input = cu. ft. metered in 3 minutes
x 1050 Btu/cu.ft. x 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 fol-
lowing apply:
a. Boiler (burner) is overfiring. CAUTION! National Fuel
Gas Code Z223.1/NFPA 54 -latest edition, 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."
Boiler rated input in
cu. ft./hr. of 1000 Btu/cu.ft.
Natural Gas
75
100
120
125
150
160
175
200
225
250
275
300
325
350
375
399
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.
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 set-
ting for safe combustion. DO NOT attempt to make this adjust-
ment unless burners are at operating temperature. Adjustment
should be made with burner access panel in final operating posi-
tion. Use of a mirror may be helpful to observe flames. Note that
burner ports are on top of main burner tube.
Cubic Feet Gas Consumption
1000 Btu/cu. ft. gas, in 3 min-
utes, at rated output
3.75
5.00
6.00
6.25
7.50
8.00
8.75
10.00
11.25
12.50
13.75
15.00
16.25
17.50
18.75
19.95
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
operating 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
clockwise will decrease the pilot flame.
c. Check safety shutdown of gas valve by following proce-
dure outlined "CARE" and "MAINTENANCE" section.
CARE AND MAINTENANCE
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
boiler and any fuel burning equipment may result in a haz-
ardous condition.
1. GENERAL MAINTENANCE (Refer also to Owner's
Information Manual)
These operations are recommended to be performed at
regular 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.
GALAXY II
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