Installation, Operation & Maintenance Manual

34
BOILER OPERATION
3. Thread a 1-1/4" NPT Pipe Nipple into the “Skim
Tapping” (Connection “J” in Figure 11.1). Tighten
firmly.
4. Thread a 1-1/4" NPT ball valve onto the nipple and
connect a 1-1/4" drain line.
5. Close all valves to the system. Provide a means of
supplying fresh water to the boiler.
6. Use common washing soda (such as Arm &
Hammer Super Washing Soda). For each 800 square
feet EDR net boiler rating, mix one pound of
washing soda with water. Pour mixture into safety
relief valve tapping.
7. Open the skim valve. Fill the boiler until water begins
to flow out of the valve.
8. Turn burners on and allow the boiler water to heat
up to between 180ºF and 200ºF. Cycle the burners
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.
9. Open the make-up water valve to continuously feed
water to the boiler. Allow water to flow out of the
skim tapping.
10. Continue skimming the boiler until the water flowing
from the skim tapping flows clear. This will likely take
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
drain valve.
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. Open the valves to the system and replace the skim
valve with a pipe cap.
J. TO SHUT DOWN THE BOILER
1. Open main line power disconnect switch to boiler.
2. Close Main and Pilot gas shut-off valves.
3. To take boiler out of service if the boiler and system
are not to be used when temperatures are below
freezing:
a. Drain the boiler and system completely and shut
off make-up water supply.
b. Open main line power disconnect switch to
boiler. Remove the fuses or secure the switch so
that the power cannot be turned on accidentally.
c. Be certain that the boiler and system are refilled
before returning to service. Follow the
Instructions in this manual and the Lighting
Instructions to operate.
Cleaning the boiler requires the use of very hot water
and corrosive chemicals. Use care when handling to
prevent injury.
WARNING
Do not leave the boiler unattended while performing
boil out. Do not allow the water to drop below the
bottom of the gauge glass or allow make up water to
enter too quickly. This will avoid the possibility of
causing failure of the boiler sections.
CAUTION
If the gauge glass becomes dirty again, this indicates
that more contaminants have worked loose in the
system. Repeat the cleaning and skimming process
as needed to clean the system.
NOTICE
Before servicing the boiler:
• Turn off all electrical power to the boiler.
• Close the Gas Service Valve.
• Allow the boiler to cool if it has been operating.
• Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation. Verify proper
operation after servicing.
CAUTION
Figure 8.1 Pilot and Burner Flames