Burnham Series 2B - Manual (Page 23)

3
B. See Figure 22 for continuous ignition system
(standing pilot).
4.
ChECK GAS INPUT RATE TO BOILER
NOTICE
USA boilers built for installation at altitudes greater
than 2,000 feet above sea level have been specially
orificed to reduce gas input rate 4 percent per 1,000 feet
above sea level per the National Fuel Gas Code, NFPA
54/ANSI Z223.1, Section 8.1.2 and Appendix F.
Canadian boilers' orifice sizing is indicated on the rating
label. High altitude boiler models are identifiable by
the fourth digit after the dash in the model number. 2:
0-2000', 4 or 5: above 2000'.
A. Input Rate and Maximum Inlet Pressure shown on
Rating Label must not be exceeded. Inlet pressure
must not be lower than minimum inlet pressure
shown on Rating Label.
B. All Rate checks and all adjustments are to be made
while boiler is firing - all other appliances connected
to the same meter as the boiler must be off.
C. With boiler off, water Manometer or water column
gauge should be connected to a shut-off valve
installed in the 1/8" outlet pressure tap in the gas
valve (see Figure 19). By installing gas valve
upstream of manometer, gas pressure can be
introduced gradually - without shut-off valve, surge
of pressure when boiler is turned on, could blow
liquid out of manometer. Replace plug in gas valve
when rate check is finished.
D. LP Gas Input:
Adjust Regulator on Gas valve so that manifold
pressure is 10 inches water column. Turning
Regulator Adjusting Screw Clockwise increases
pressure. Counterclockwise rotation decreases
pressure.
E. Natural Gas Input
1. Appx. Input - Adjust regulator on Gas valve so
that manifold pressure is three and a half (3½)
inches water column. Turning Regulator
Adjusting Screw Clockwise increases pressure,
Counterclockwise rotation decreases pressure. If
Figure 3: 0mm Main Burner Flame
Figure : 1 Inch Main Burner Flame
more accurate check on input is necessary see
(2) below.
For minor input changes readjust Regulator Gas
valve to increase or decrease manifold pressure
to obtain corresponding increase or decrease in
gas input. If it is necessary to increase manifold
pressure more than 0.3" of water to obtain rated
input, remove orifices and drill one size larger.
Reinstall and recheck input rate.
2. Additional Check on Input - Since input is a
function of heating value, specific gravity, and
volume of gas flow contact your utility for the
first two items in order to utilize the formula
below. The gas meter should then be clocked for
three (3) minutes with stop watch and
substituting the appropriate values in the formula
below, determine what the gas flow should be in
this 3 minute period to give the input shown on
the Rating Label:
Gas Input
=
Btuh Input
(cu. ft.) Heating Multiplier
per 3 min. Value X from
of Gas Table 3
(Btu / cu. ft.
5.
MAIN BURNER FLAMES should have a clearly
defined inner cone (see Figure 23 or 24) with no yellow
tipping. Orange-yellow streaks caused by dust should
not be confused with true yellow tipping.
The main burners in this boiler will not operate cleanly
or efficiently if they are contaminated with dirt and/or
construction dust. Burners should be cleaned and the
combustion chamber vacuumed following instructions
in Section Iv. Service.
6.
ChECK PILOT BURNER FLAME.
A. Continuous Ignition (Standing Pilot)
LP gas Models 202 and 202x. See Figure 25.
Natural gas Models 202 through 206 and 207 with
1" diameter burners. See Figure 25.