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STARTING THE BOILER
2. The boiler must be cleaned to remove any
accumulation of oil, grease, sludge, etc. that may be
in the system. These substances can cause foaming
and surging of the boiler water, producing unstable
water line and water carryover to the system.
3. The piping for a 2" Skim Valve must be done as
shown in this manual, with the skim valve mounted
off the Pop Safety Valve tee on the rear of the boiler.
4. Use common washing soda (such as Arm and Hammer
Super Washing Soda). Mix the soda with water in a 10
quart pail. Use a proportion of one pound of washing
soda for each 800 square feet EDR net boiler rating.
Remove the Pop Safety Valve and pour the washing
soda solution into the boiler through the Pop Safety
Valve tee. Replace Pop Safety Valve.
5. Connect a 2 inch drain line off of the Skim Valve,
run to a point of safe discharge.
6. Close all valves to the system. Provide a means of
continuous fresh water to the boiler for the cleaning
process.
7. Open the Skim Valve. Fill the boiler until water
begins to flow out of the valve.
8. Turn burner on and allow the boiler water to heat up
to just below steaming (180° to 200° F). Cycle the
burner to maintain temperature during skimming. Do
not allow the boiler to steam. Steaming mixes up the
contaminants in the water instead of floating them at
the surface.
Table 9.1: Typical Combustion Chamber Pressure and Boiler Draft Loss
Model
LC-04
LC-05R
LC-05
LC-06
LC-07
LC-08
LC-09
LC-10
LC-11
LC-12
LCE-13
LCE-14
LCE-15
LCE-16
LCE-17
LCE-18
LCE-19
LCE-20
LCE-21
LCE-22
LCE-23
LCE-24
NOTE: Actual chamber pressure and draft loss readings may vary with each boiler and installation due to variation in the heat exchanger,
deposits in the flueways, actual burner firing rate and excess air conditions. Use the above numbers as a general guide only. If the measured draft
loss is considerably higher than the above, check the flueways for deposits and confirm the burner firing rate.
40
Do not leave the boiler unattended while firing.
Take great care not to allow the water level to drop
below the bottom of the gauge glass or to allow fresh
water make-up to flow in too fast. This will avoid the
possibility of causing the boiler sections to fracture.
Combustion Chamber Pressure
with 0.1" w.c. at Rear Flue Box Test Port
(Inches w.c.)
+ 0.22
+ 0.22
+ 0.24
+ 0.26
+ 0.27
+ 0.28
+ 0.29
+ 0.30
+ 0.31
+ 0.32
+ 0.24
+ 0.25
+ 0.26
+ 0.27
+ 0.28
+ 0.29
+ 0.30
+ 0.31
+ 0.31
+ 0.31
+ 0.32
+ 0.32
9. Open the make-up water valve to continuously feed
water to the boiler. Allow water to flow out the skim
tapping.
10. Continue skimming the boiler until the water flowing
from the skim tapping flows clear. This will take
some time, possibly several hours for a dirty system.
11. After skimming is complete, close the skim valve and
turn off the boiler.
12. Close the make-up water valve and open the boiler
blowdown valves.
13. Drain the boiler completely, then refill and drain
again one or two times to make sure all of the soda
has been washed out.
14. Restore piping to normal. Pipe a nipple and cap in
the skim valve.
15. Note: If the gauge glass becomes dirty again, this
indicates more contaminants have worked loose in
the system. Repeat the cleaning and skimming
process as needed to clean the system.
CAUTION
Boiler Draft Loss
(Inches w.c.)
0.12
0.12
0.14
0.16
0.17
0.18
0.19
0.20
0.21
0.22
0.14
0.15
0.16
0.17
0.18
0.19
0.20
0.21
0.21
0.21
0.22
0.22
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