Gas Flow Rate In Cubic Feet Per Hour - Burnham Revolution Installation, Operating And Service Instructions

Check main burner flame. See Figures 47A and 47B.
K.
Flame should have clearly defined inner cone with no
yellow tipping. Orange-yellow streaks should not be
confused with true yellow tipping.
L
. Check thermostat operation. Raise and lower
temperature setting to start and stop boiler operation.
M.
Check ignition control module shut-off. Disconnect
pilot lead wires from gas valve. If burners do not
shutdown, determine cause of malfunction. Replace
necessary items and check operation.
N.
Check low water cutoff (if so equipped).
1. Adjust thermostat to highest setting.
2. With boiler operating, open drain valve and slowly
drain boiler.
3. Main burners and pilot burner will extinguish and
blower will stop when water level drops below low
water cutoff probe. Verify limit, thermostat or other
controls have not shut off boiler.
4. Adjust thermostat to lowest setting. Refill boiler.
O.
Check limit.
1. Adjust thermostat to highest setting.
2. Observe temperature gauge. When temperature is
indicated, adjust limit to setting below observed
temperature. Main burners and pilot burner should
extinguish, and blower should stop.
3. Adjust limit to setting above observed temperature.
Ignition sequence should begin.
4. Adjust thermostat to lowest setting. Adjust limit to
desired setting.
P.
Adjust gas input rate to boiler.
1. Adjust thermostat to highest setting.
2. Check manifold gas pressure. See Table 5 or rating
label located in the boiler's vestibule compartment.
Adjust gas valve pressure regulator as necessary
(turn adjustment screw counterclockwise to decrease
manifold pressure, or clockwise to increase mani-
fold pressure). If pressure cannot be attained, check
gas valve inlet pressure. If less than minimum
indicated in Table 5 or boiler's rating label, contact
gas supplier for assistance.
3. Clock gas meter for at least 30 seconds. Use Table
10 to determine gas flow rate in Cubic Feet per
Hour.
WARNING
Failure to properly adjust gas input rate will result
in over firing or under firing of the appliance.
Improper and unsafe boiler operation may result.
4. Determine Input Rate. Multiply gas flow rate by gas
heating value.
5. Compare measured input rate to input rate stated on
rating plate.
a. Boiler must not be over fired. Reduce input rate
by decreasing manifold pressure. Do not reduce
more than 0.3 inch w.c. If boiler is still overfired,
contact your Burnham distributor or Regional
Office for replacement Gas Orifice.
b. Increase input rate if less than 98% of rating
plate input. Increase manifold gas pressure no
more than 0.3 inch w.c. If measured input rate is
still less than 98% of rated input:
i. Remove Main Burners per procedure in
Section X: Service.
ii. Remove gas orifices. Drill one (1) drill size
larger (drill size is stamped on orifice, or see
Section XI: Repair Parts).
iii. Reinstall gas orifices and main burners.
Measure input rate.
6. Recheck Main Burner Flame.
7. Return other gas-fired appliances to previous
conditions of use.
Confirm operation of the variable speed boiler
Q.
circulator.
1. Initiate a call for heat and observe the boiler's
temperature gauge and the VS3000 "% on" LED.
Refer to Sequence of Operation, Figure 49.
2. Refer to Figure 50 for a flow diagram of the boiler
circulator piping.
R.
Review User's Information Manual and system
operation with owner or operator.
Table 10: Gas Flow Rate in Cubic Feet
Per Hour
Seconds
One-Half
for One
Cu. Ft.
Revolution
30
60
32 56
34 53
36 50
38 47
45
40
42 43
44 41
39
46
37
48
50 36
52 35
54 33
56 32
58 31
30
60
Size of Gas Meter Dial
One Two
Cu. Ft. Cu. Ft.
120 240
113 225
212
106
200
100
95
189
90 180
172
86
82
164
78 157
75 150
72
144
138
69
67 133
129
64
62 124
120
60
3