Crown Boiler 24-03 用户手册

51

sufficiently to permit a steady trickle of water 

from the surface blowoff pipe.  Continue this 

slow boiling and trickle of overflow for several 

hours until the water coming from the overflow 

is clear.

d.  Stop burner and drain boiler in a manner and to 

a location that hot water can be discharged with 

safety.

e.  Refill boiler to normal water line.  If water in 

gauge glass does not appear to be clear, repeat 

steps (a. thru e.), and boil out the boiler for a 

longer time.

2.  Low pressure steam boilers such as the Series 

24 should be maintained with appropriate water 

treatment compounds.  After cleaning process has 

been completed, add water treatment compounds 

as  recommended by your local qualified water 

treatment company. 

3.  Remove temporary surface blowoff piping and 

replug tapping.  Boil or bring water temperature to 

180°F promptly in order to drive off the dissolved 

gases in the fresh water.

4.  If unsteady water line, foaming or priming persist, 

install gate valve in Hartford Loop and drain valves 

in return main and at boiler and proceed as follows:
a.   Connect hoses from drain cocks to floor drain.  

Close gate valve in Hartford Loop and open 

drain cock in return main.  Fill boiler to normal 

water level, turn on burner and operate boiler 

at this water level for at least 30 minutes after 

the condensate begins to run hot, then turn off 

burner.

  Close all radiator valves.  Remove all supply 

main air valves and plug the openings in supply 

main.

b.  Draw about 5 gallons of hot water from boiler 

into a container and dissolve into it appropriate 

amount of a recommended boilout compound.  

Remove surface blowoff plug and pour this 

solution into boiler, then reinstall plug.

c.  Turn on burner and keep operating while feeding 

water to boiler slowly.  This will raise water level 

in boiler slowly so that water will be boiling hot 

and will rise slowly into supply main and back 

through return main, flowing from drain hose 

at about 180°F.  Continue until water runs clear 

from drain hose for at least 30 minutes.

d.  Stop feeding water to boiler but continue 

operating burner until excess water in boiler 

flows out through supply main and water lowers 

(by steaming) until it reaches normal level in 

boiler.  Turn off burner.  Drain boiler.  Open all 

radiator valves.  Reinstall all supply main air 

valves.  Open gate valve in Hartford Loop.

e.  When boiler has cooled down sufficiently (crown 

sheet of sections are not too hot to touch), close 

4.  CHECK OPERATING CONTROL on boiler 

equipped with tankless heaters.  With burner off, 

draw hot water until burner starts, then turn off hot 

water and check burner shutdown. 

5.  CHECK RTC CONTROL - see the Test Section in 

the RTC Installation and Maintenance Manual.

  BOILER AND SYSTEM CLEANING - STEAM 

1.  Oil, greases & sediments which accumulate in a 

new boiler and piping must be removed in order 

to prevent an unsteady water line and carry over 

of the water into the supply main above boiler.  

Operate the boiler with steam in the entire system 

for a few days allowing the condensate to return 

to the boiler.  If the condensate can temporarily be 

wasted, operate boiler only for the length of time 

it takes for condensate to run clear.  If the latter 

cannot be achieved or if the condensate is returned 

to the boiler, boil out the boiler using the SURFACE 

BLOWOFF connection.  See Figure 40a.
a.  Drain boiler until water is just visible in gauge 

glass.  Run temporarily 1½” pipe line from the 

surface blowoff connection to an open drain or 

some other location where hot water may be 

discharged safely.  Do not install valve in this 

line.

b.  Add an appropriate amount of recommended 

boilout compounds.

c.  Start burner and operate sufficiently to boil 

the water without producing steam pressure.  

Boil for about 5 hours.  Open boiler feed pipe