PB Heat EC Series User Manual download pdf (Page 17)

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 1-1/2 NPT skim tapping

on rear of boiler. See Figure 7.1 (Section 7) for skim

tapping location. Run a 1-1/2 NPT 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. Pipe a nipple and

cap in the skim valve.

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

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PB Heat EC Series User Manual Page 17

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