Bryant 234B - Manual (Page 8)

S E P / 0 2 / 2 0 0 8 / T U E 0 8 : 1 8 UTC TECH PUB
STÁRT-.UP AND ADJUSTMENT
Check to be sure that all connections have been
made. Before attempting any operation, fill the
system with water. Never light a burner under an
empty boiler. After filling system with water, bleed
all air from the radiators. Add water and bleed
again. Repeat as necessary until system is free of
air. Open all valves on water supply and- return
lines.
Light the pilot using procedure outlined on the
lighting instruction plate attached to unit However,
when lighting the pilot for the first time, perform the
following additional steps:
1. If the gas supply line, was not purged prior to
connecting the boilet it will be full of air; Since
it would take a long time to.went this ,air thipugh the
small pilot port, it is ,recóMffiended-th^P pilot
supply line be disconnected at the pilot shut-off
valve and the supply line be allowed to purge until
the odoi of gas Is 'dëtected- -;Never:purge ^^Çias- l ines
into the combustion chamber: Itniiiëdiatèly upon
detection of gas odor^ :rëcOnneCt the pilot supply
tube* Allow 5 minutes tO-élápsfe and light the pilot
in accordance with the instructions on the lighting
plate.
2. The pilot Дате should be soft blue' in color.
a. For natural gas controls (D4), this flame should
be of sufficient length to provide good impingment
on the unimetal of the Bryant pilot. Flame should
extend upward between the carry-over ports of the
two adjacent burners. Pilot ñame should not touch
boiler section.
'b.tFof -Dâ and ;D€iUghs'controls, the ñame should
Buïfounid the tip of the thermocouple element of the
piidf and extend downward to include 3/8” to 1/2”
of' the thermocouple. The ñame must never come in
contact with any other part of the thermocouple or
■its lea'd''Wire.“"'The"ña'm6'^li'es'"un'de'r-th'ff“tarr'y-over ^
ports of the burners and merges with the carry-over
flames. Pilot flame should not touch boiler section.
3. If the pilot flame does not have the appearance
described above, it may be adjusted by means of
the manual pilot shut-off valve (B valve).
a. The valve is equipped with an adjustable screw.
Turn the handle to the full open position and remove
the screw cap to expose the adjustable screw. Turn
adjusting screw until flame has the desired appear­
ance.
b- Replace screw cap.
Light main burners using the procedure outlined on
the metal lighting instruction plate attached, to the
unit.
Adjust gas rate for natural and manufactured gases.
Input should be checked at the meter to make sure
that it corresponds with that shown on the rating
plate attached to the unit.
F A X N o , 3 1 7 2 4 0 5 6 6 2 P . 0 0 8
L Remove 1/8” plug in manifold downstream from
the gas valve and connect manometer to observe
manifold pressure.
2. Set thermostat to call for heat. Be sure that all
other gas using appliances are turned off during
this period of adjustment.
3. Observe manifold pressure. It should be adjusted
to read ,3” w.c. * 0.3" w.q. Adjustment of the pres-
,sure.^ is accomplished by means of the adjusting
isctew on |he ,gas pressure regulator. (This screw is
concealed under the regulator sealing cap.) Turn
screw clockwise to increase pressure and counter-
blbckwise td decrease pressure.
4. Determine input as follows:
a. Count number of seconds required for one com­
plete revolution of dial on the test meter (utility gas
meter).
b. Divide 3,600 by the number of seconds counted
in Item ^a' above.
c. Multiply results of 'b' above by the number of
cubic feet per revolution of the test dial. This gives
cubic feet per hour of gas flow.
d. Multiply results of Item 'c* above by the heat
value of the gas in BTU. (Consult local utility for
this value). This gives the total measured input in
BTU/Hr.
Example:
’"Size of 'test'MeterdiaT-5 icUt'-ft, ■ ■■''■'■ ■ “ ■ ..... .
Seconds to complete one-revolution -185 seconds
Heating value of gas used-1050 BTU/cu. ft.
Proceed with calculation as follows:
□ . 185 seconds to. complete one revolution
b. 3,600 .divided ’by 185 = 19.5 (approximately)
c. 19.5 X 5 = 97.5 cu. ft./hr. gas flow
d. 97.5 X 1« = 102,375
Small changes in input can be made by changing the
manifold pressure as previously described. However,
the manifold pressure should not vary more than 0.3"
w,c. from the rated pressure of 3” w.c.
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