Burnham Series 5B User Manual download pdf (Page 71)

SECTION V – SERVICE (continued)

WARNING



      



- Set thermostat to the highest setting.

- While boiler is operating, open drain valve

and slowly drain down boiler water.

CAUTION



- Main burners should turn off when water

level drops below low water cut-off. At this

point the water level in gauge glass will just

be visible.

- Be sure that it is the low water cut-off

control and not the room thermostat,

pressure cut-out or other control that has

shut off the burners.

- Relltheboilertothenormalwaterlevel.

- Main burners should reignite.

- Clean out the boiler according to the

instructions for steam boilers on page 41.

- Reset controls for normal operation.

8. FREQUENT WATER ADDITION

A leaky system will increase the volume of make-up

watersuppliedtotheboilerwhichcansignicantly

shorten the life of the boiler. Entrained in make-up

wateraredissolvedmineralsandoxygen.Whenthe

fresh, cool make-up water is heated in the boiler the

mineralsfalloutassedimentandtheoxygenescapes

as a gas. Both can result in reduced boiler life. The

accumulation of sediment can eventually isolate

the water from contacting the cast iron. When this

happensthecastironinthatareagetsextremelyhot

andeventuallycracks.Thepresenceoffreeoxygen

in the boiler creates a corrosive atmosphere which, if

IMPORTANT























the concentration becomes high enough, can corrode

the cast iron through from the inside. Since neither of

these failure types are the result of a casting defect the

warranty does not apply. Clearly it is in everyone’s best

interest to prevent this type of failure. The maintenance

of system integrity is the best method to achieve this.

Refer to Minimum Water Quality Requirements chart

on Page 41.

9. OXYGEN CORROSION:

WARNING











      



Therearemanypossiblecausesofoxygen

contamination such as:

a. Additionofexcessivemake-upwaterasaresult

of system leaks.

b. Absorptionthroughopentanksandttings.

c. Oxygenpermeablematerialsinthedistribution

system.

 Inordertoensurelongproductlife,oxygen

sources should be eliminated. This can be

accomplished by taking the following measures:

a. Repairing system leaks to eliminate the need for

addition of make-up water.

b. Eliminating open tanks from the system.

c. Eliminatingand/orrepairingttingswhichallow

oxygenabsorption.

d. Use of non-permeable materials in the

distribution system.

e. Isolating the boiler from the system water by

installingaheatexchanger.

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