PB Heat WV Series - Manual (Page 16)

14
BURNER SETUP & BOILER OPERATION
E. CLEAN THE BOILER
(STEAM BOILERS ONLY)
1. Clean the boiler within one week after initial start-up.
Cleaning will be more effective if boiler operates a
day or two to loosen sediment and impurities in
system.
2. Boiler must be cleaned to remove any accumulation
of oil, grease, sludge, etc. in the system. These
substances can cause foaming and surging of boiler
water, producing an unstable water line and water
carryover to system.
3. Connect a skim valve off the 1-1/4 NPT skim tapping
on front of boiler. See WBV Steam Boiler Figure 7.2
(Section 7) to locate skim tapping. Run a drain line
off skim valve to a point of safe discharge.
4. Provide a means of supplying continuous fresh water
to the boiler for the cleaning process.
5. Use common washing soda, such as Arm and
Hammer Super Washing Soda. Mix 1/2 pound of
soda with water in a 10 quart pail. Pour the mixture
into the boiler through the safety relief valve tapping.
6. Open the skim valve. Fill boiler until water begins to
flow out of the valve.
7. Turn on burner. Allow boiler water to heat up to just
below steaming (180 - 200°F). Do not allow boiler to
steam; steaming mixes up contaminants instead of
floating them at surface.
8. Open make-up water valve to continually feed water
to boiler. Adjust flow to maintain water temperature
at 180 - 200° F.
9. Continue skimming boiler until water flowing from
skim tapping flows clear. This will take some time,
possibly several hours for a dirty system.
10. Turn off burner, close make-up water valve.
11. Drain boiler completely. Refill and drain one or two
times to wash out all washing soda.
12. Remove skim valve and piping. Install 1-1/4"NPT plug
in skim tapping.
Cleaning the boiler requires the use
of very hot water and corrosive
chemicals. Use care when handling
to prevent injury.
WARNING
Do not leave boiler unattended while
firing burner. Operating boiler with
water below minimum permissible
water level may fracture sections.
CAUTION
Do not allow make-up water to flow
too fast. Excessive quantities of cold
water may fracture sections.
CAUTION
If gauge glass becomes dirty more
contaminants have worked loose in
system. Repeat cleaning and
skimming process as needed to
clean system.
NOTICE