Burnham 8HE Series Installation, Operating And Service Instructions page 33

7
System Start-up
M. Check high limit function. Set thermostat to higher
than normal setpoint. Allow boiler to run until high
limit is achieved (180° F default). Burners will shut
down. Note - Hydrostat Economy feature may
cause boiler to cycle before reaching high limit.
N. Adjust gas input rate to boiler.
1. Adjust thermostat to highest setting.
Table 7-4: Input Rate
Size of Gas Meter Dial
Seconds
for One
One-Half
Revolution
Cu. Ft.
30 60
32 56
34 53
36 50
40 45
38 47
40 45
42 43
44 41
46 39
48 37
50 36
52 35
54 33
56 32
58 31
60 30
62 29
64 29
66 29
68 28
70 26
72 25
74 24
76 24
78 23
80 22
111828-01 - 1/23
(continued)
One Two Five
Cu. Ft. Cu. Ft. Cu. Ft.
120 240 600
113 225 563
106 212 529
100 200 500
90 180 450
95 189 474
90 180 450
86 172 430
82 164 410
78 157 391
75 150 375
72 144 360
69 138 346
67 133 333
64 129 321
62 124 310
60 120 300
58 116 290
56 112 281
54 109 273
53 106 265
51 103 257
50 100 250
48 97 243
47 95 237
46 92 231
45 90 225
8HE Installation, Operating & Service Instructions
2. Check manifold gas pressure. Manifold
pressure is listed on rating label. Adjust
gas valve pressure regulator as necessary
(turn adjustment screw counterclockwise to
decrease manifold pressure, or clockwise to
increase manifold pressure). If pressure can
not be attained, check gas valve inlet pressure.
If less than minimum gas supply pressure
listed on rating label, contact gas supplier for
assistance.
3. Clock gas meter for at least 30 seconds. Use
Table 7-4 to determine gas flow rate in Cubic
Feet per Hour.
4. Determine Input Rate. Multiply gas flow rate by
gas heating value.
!
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.
5. Compare measured input rate to input rate
stated on rating label.
a. Boiler must not be overfired. 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
Commercial distributor or Regional Office
for replacement Gas Orifices.
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, contact your Burnham Commercial or
regional office for larger orifices.
6. Recheck Main Burner Flame. See Section I
7. Return other gas-fired appliances to previous
conditions of use.
O. Clean Heating System
Oil, grease, and other foreign materials which
accumulate in new hot water boilers and a new or
reworked system should be boiled out, and then
thoroughly flushed. A qualified water treatment
chemical specialist should be consulted for
recommendations regarding appropriate chemical
compounds and concentrations which are
compatible with local environmental regulations.
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