Burnham Series 4N Boiler Instruccion De Instalación

11.  Screw the probe into the boiler tapping.
12.  Mount the low water cutoff control on the 

probe.

13.  Reconnect the control to probe wiring. 
14.  Fill the boiler to its normal waterline.
15.  Add boiler water treatment compound as 

needed (see Section III Item 8). 

16. Restore electric service to boiler.
17. Fire burner to raise water temperature to 

above 180°F to drive off free oxygen. 

 

BEFORE RETURNING BOILER TO SERVICE: Follow 

the low water cutoff check out procedure in Section III 

Item 4 Part C.

 

 

 

B.  Float Type Low Water Cut-Off  During the  

 

 

 

heating season, if external low water cutoff is on   

 

 

the boiler, the blow off valve should be opened    

 

 

once a month (use greater frequency where  

 

 

 

conditions warrant), to flush out the sediment    

 

 

chamber so the device will be free to function    

  properly.
 

Low water cutoffs and water feeders should be 

dismantled annually by qualified personnel, to the 

extent necessary to insure freedom from obstructions 

and proper functioning of the working parts. Inspect 

connecting lines to boiler for accumulation of mud, scale, 

etc., and clean as required. Examine all visible wiring 

for brittle or worn insulation and make sure electrical 

contacts are clean and that they function properly. Give 

special attention to solder joints on bellows and float 

when this type of control is used. Check the float for 

evidence of collapse and check mercury bulb (where 

applicable) for mercury separation or discoloration. 

DO NOT ATTEMPT TO REPAIR MECHANISM IN THE 

FIELD. Complete replacement mechanisms, including 

necessary gaskets and installation instructions, are 

available from the manufacturer. 
6. CHECK BURNER AND CONTROLS at least once 

a year. See Item 4 under Operating Instructions for 

control checks. See Burner Manual for burner tests and 

adjustments.
7. LUBRICATE BOILER COMPONENTS according 

to manufacturer’s instructions. Generally, this involves 

burner and circulator.
8. CHECK SAFETY vALvE at the start of each heating 

season and once or twice during the season to be sure it 

is in working condition. To do this, fasten wire or cord to 

the lever of the valve and pull the lever standing a safe 

distance away from the valve.

Clean firetubes with flue brush and reinstall  

 

turbulators. If turbulators are corroded or   

deteriorated, replacing them will ensure a high 

level of boiler efficiency. Remove soot and rust 

and reseal the boiler.

A. Probe Type Low Water Cut Off  Although these 

devices are solid state in design, the probe is  

 

exposed to possible contamination in the boiler    

water.

 

It is important to physically remove the probe 

from the boiler tapping annually and inspect it for 

accumulation of scale or sediment.

replace the probe:
1.  Turn off electric service to the boiler.
2.  Drain boiler water to a level below the tapping 

for the probe.

3.  Disconnect the wiring connections between 

the low water cutoff and the probe.

4.  Dismount the low water cutoff control from the   

probe.

5.  Unscrew the probe from the boiler tapping. 
6.  Inspect that portion of the probe that is 

exposed to the boiler water for scale or 

sediment buildup.

7.  Light deposits may be removed by wiping the  

probe with a damp cloth. Wiping the probe 

with a cloth soaked in vinegar will remove 

more tenacious lime deposits. The most 

stubborn deposits may be removed from the 

probe by using diluted amount (3 part of water 

to 1 part) of phosphoric acid (H2PO4). 

8.  Wire brushing of the probe is not 

recommended.

9.  Clean the pipe threads of the probe to remove 

old, hardened pipe dope and other foreign 

matter.

10.  Apply a moderate amount of good quality pipe  

dope to the pipe threads on the probe, leaving 

the first two threads bare. Do not use PTFE 

(Teflon) tape.