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
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.
Table 12: Input Rate
Seconds |
| Size of Gas Meter Dial |
| ||
for One | One | Two |
| Five | |
Revolution | Cu. Ft. | Cu. Ft. | Cu. Ft. |
| 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 |
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.
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