Burnham Independence PV Boiler User Manual


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23
4. Drain condensate from drain valve in wet return.
Operate boiler until condensate runs clean.
Alocalqualiedwatertreatmentchemicalspecialist
is a suggested source for recommendations regarding
appropriate chemical compounds and concentrations
which are compatible with local environmental
regulations.
N. Boil-out Boiler.
1. Follow instructions TO TURN OFF GAS TO
APPLIANCE. See Figure 21.
2. Fill boiler to normal waterline.
3. Remove safety valve.
4. Pour recommended boil-out compound into
boiler through safety valve opening.
5. Reinstall safety valve in Tapping "E" with spindle in
vertical position.
6. Follow Operating instructions to place boiler in
operation. See Figure 21. Check controls operation
per Paragraphs F to K. Boil water for at least 5
hours.
7. Follow instructions TO TURN OFF GAS TO
APPLIANCE. See Figure 21. Drain boiler and
system piping.
8. Remove drain valve. Thoroughly wash boiler water
passages with high pressure spray through drain
valve tapping.
9. Reinstall drain valve in Tapping "D".
O. Second Boilout for Stubborn Cases. If all oil and
grease is not removed a second boilout using surface
blow-off is necessary.
1. Run 1 NPT pipe from Surface Blow-Off Tapping
"F" to open drain. Do not install shut-off valve or
other restriction.
2. Fill boiler to top of gauge glass.
3. Remove safety valve.
4. Pour recommended boil-out compound into boiler
through safety valve opening.
5. Reinstall safety valve in Tapping "E" with spindle in
vertical position.
6. Follow Operating Instructions to place boiler in
operation. See Figure 21. Boil water for
approximately 5 hours without producing steam.
7. Openboilerllshut-offvalvetoproducesteady
trickle of water from surface blow-off pipe.
Continue boil-out for several hours until surface
blow-off water runs clear.
8. Follow instructions TO TURN OFF GAS TO
APPLIANCE. See Figure 21. Drain boiler and
system piping.
9. Remove drain valve. Thoroughly wash boiler
water passages with high pressure spray through
drain valve tapping.
10. Fill boiler to normal waterline. If water in gauge
glass is not clear, repeat procedure starting at step
2.
11. Remove surface blow-off piping. Install 1 NPT plug
in Tapping "F".
If unsteady water line, foaming or priming persist:
12. Follow Operating Instructions to place boiler in
operation. See Figure 21.
13. Install gate valve (shut-off valve) in Hartford Loop.
Install drain valves in return main and at boiler. See
Figure 4 or 5.
14. Connecthosesfromdrainvalvestooordrain.
Close gate valve in Hartford Loop. Open drain
valve in return main.
15. Fill boiler to normal water line. Follow Operating
Instructions to place boiler in operation. See Figure
21.
16. Operate boiler for at least 30 minutes after
condensate begins to run hot. Follow instructions
TO TURN OFF GAS TO APPLIANCE. See Figure
21.
17. Close all radiator valves. Remove all supply main
air valves. Plug openings in supply main.
Table 13: 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.
30 60 120 240
32 56 113 225
34 53 106 212
36 50 100 200
38 47 95 189
40 45 90 180
42 43 86 172
44 41 82 164
46 39 78 157
48 37 75 150
50 36 72 144
52 35 69 138
54 33 67 133
56 32 64 129
58 31 62 124
60 30 60 120
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