Caution, Warning – Burnham 8H User Manual
Page 59
5
CAUTION
Avoid operating this boiler in an environment
where saw dust, loose insulation fibers, dry wall
dust, etc. are present. If boiler is operated under
these conditions, the burner interior and ports
must be cleaned and inspected daily to insure
proper operation.
a. Loosen lock screw.
b. Close air adjustment until yellow tips appear on
flames.
c. Slowly open air adjustment until clearly defined
inner cones are visible.
d. Tighten lock screw.
4. Adjust thermostat to normal setting.
J.
Check thermostat or operating control operation.
Raise and lower temperature setting to start and stop
boiler operation.
K.
Check ignition system shut-off.
1. Standing Pilot (24V): Disconnect thermocouple
lead at Gas Valve. Gas Valve must close and pilot
and main burners extinguish. If not, replace the gas
valve.
2. Honeywell EI: Disconnect ignitor/sensor cable from
ignition module. Gas valve must close and pilot and
main burners extinguish. If not, measure voltage
across gas valve terminals “TH” and “TR”.
a. If voltage is not present, replace gas valve.
b. If voltage is present, replace ignition module.
3. EP and OP: Refer to instructions supplied with the
Honeywell RM7890 Burner Control.
L.
Check Limit(s).
1. Adjust thermostat to highest setting.
2. Observe temperature gauge. When temperature
exceeds limit set point main burners should
extinguish.
3. Adjust limit to setting above observed reading. Main
burners should reignite.
4. Adjust thermostat to lowest setting. Adjust limit to
desired setting.
M.
Adjust gas input rate to boiler. Natural Gas.
1. Adjust thermostat to highest setting.
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
12 to determine gas flow rate in Cubic Feet per
Hour.
Seconds
for One
Revolution
Size of Gas Meter Dial
One-Half
Cu. Ft.
One
Cu. Ft.
Two
Cu. Ft.
Five
Cu. Ft.
30
60
120
240
600
32
56
113
225
563
34
53
106
212
529
36
50
100
200
500
40
45
90
180
450
38
47
95
189
474
40
45
90
180
450
42
43
86
172
430
44
41
82
164
410
46
39
78
157
391
48
37
75
150
375
50
36
72
144
360
52
35
69
138
346
54
33
67
133
333
56
32
64
129
321
58
31
62
124
310
60
30
60
120
300
62
29
58
116
290
64
29
56
112
281
66
29
54
109
273
68
28
53
106
265
70
26
51
103
257
72
25
50
100
250
74
24
48
97
243
76
24
47
95
237
78
23
46
92
231
80
22
45
90
225
Table 2: Input Rate
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 distributor or Regional
Office for replacement Gas Orifices.