Burnham Series 4N Boiler Instruccion De Instalación

See item 10 under Operating Instruction if it becomes 

necessary to add water to the boiler more frequently 

than once a month.

 

Inspection should be conducted annually. Service 

as frequently as specified in paragraphs below. Before 

service or maintenance is performed complete boiler 

shutdown/cooldown procedure.

 PROCEDURE
NOTE: This procedure is generally required in 

preparation for   corrective or preventative maintenance 

in the unit. This procedure must be supervised by an 

individual who is thoroughly qualified in operation and 

maintenance of the equipment at hand. This is written 

with Steam Boilers in mind, but the principles are 

applicable to Hot Water Boilers as well.

A.  Decrease plant load as much as possible.
B.  Turn boiler switch off. If control power from  

burner is used to support accessories, leave on 

until boiler system has cooled down.

C.  Shut and lock manual gas and oil valves as  

applicable.

D.  In single boiler installations, some small steam  

loads can remain on to assist in a controlled  

cooldown of the boiler (i.e., deaerator). In multiple  

boiler installations, shut down the non-return 

valve and the back up valve. Lock them shut.

E. Allow the boiler feed pump to remain active. As 

the boiler cools down, the water level is reduced 

by demand or shrinkage. It is best to be aware of 

the boiler level at all times.

F.  When boiler pressure has decreased to 5 to 

10 psi on the pressure gauge, open the boiler 

manual vent valve on the top of the boiler. This 

is to act as a sentinel against the increase in 

pressure and to prevent the boiler from going into 

a vacuum. Lock the valve open.

NOTE: Depending on the size of the boiler, the large 

mass of heating surfaces that are still hot can cause the 

boiler water temperature to increase, even if the gauge 

pressure is “0”. It is better to allow the entire system to 

cool gradually, never force cool the boiler as damage 

can also be inflicted due to “thermal shock.”

G.  When boiler and water are below 120°F, shut off    

power to the unit and lock out the circuit    

 

breakers. 

H.  If required, open front and rear doors for   

 

observation of fireside surfaces. 

I.  Drain boiler down as far as required. (Usually  

completely.) Make sure the vent valve on the top 

of the boiler remains open. Open and lock the 

float control low water cutoff drain valves. These 

will serve as additional vents.

J.  Shut and lock the boiler feed valves, and any  

 

blowdown valves that can be affected by other  

boilers in the same facility (i.e., bottom blow down 

valves can tie into a common blowdown 

separator in a multiple boiler installation).

K.  If necessary to remove handhole and/or manhole  

plates for water side inspection or maintenance,  

use extreme caution. Loosen the nuts securing 

the arch enough to allow the plate to drop  

approximately 1/8 inch when tapped loose with    

a mallet. Once again, ensure the pressure in the    

boiler is “0” before loosening the plate. Remove  

the plate the remainder of the way. Wear gloves    

and eye protection at all times. 

AND FLUE   

 

At least once each year, preferably at the end of the 

heating season.

Vent system should be checked annually for:
1. Obstructions.
2.  Accumulations of soot.
3.  Deterioration of vent pipe or vent accessories   

due to condensation or other reasons. 

4.  Proper support  no sags, particularly in 

horizontal runs.

5.  Tightness of joints.

 

Remove all accumulations of soot with a wire 

brush and vacuum. Remove all obstructions. Replace 

deteriorated parts and support properly. Seal all joints.

   At the end of the heating season, clean boiler  

 

heating surfaces thoroughly. Access to boiler  

firetubes may be gained by removing the front 

and rear smokeboxes or smokebox doors.  

 

Where applicable, remove the turbulators, paying  

close attention to which tubes have turbulators.