Maytag POF1HD091AVFA, Installation, Operation And Maintenance Manual

13.  OIL FILTER 

All fuel systems should include an oil filter between the 
fuel oil storage tank and the oil burner. When using an oil 
burner nozzle smaller than 0.65 U.S. Gallons Per Hour, 
install an additional 7 to 10 micron filter as close as 
possible to the oil burner. 

14.  OIL BURNER NOZZLES 

The POF1HD140AVFA and POF1HD091AVFA are 
certified for multiple firing rates, ranging from 58,000 to 
116,000 Btu/h. By manipulating the oil burner nozzle, 
flame retention head, static plate and temperature rise; 
the furnace may be fired at an ideal rate for a wide range 
of structures. Refer to Table A-1 and the furnace rating 
plate to determine the proper combinations. 

15.  OIL BURNER ADJUSTMENT 

The burner air supply is adjusted to maintain the 

fuel to 

air

ratio

 to obtain ideal combustion conditions. A lack of 

air causes "soft" and "sooty" flames, resulting in soot 
build-up throughout the heat exchanger passages. 
Excess combustion air causes a bright roaring fire and 
high stack temperatures resulting in poor fuel efficiency. 
The POF1HD140AVFA and POF1HD091AVFA furnaces 
operate most efficiently with a No. 1 smoke spot on the 
Bacharach Scale. This is not necessarily the optimum 
setting; however, because dust will inevitably build up on 
the air moving components of the oil burner assembly. 
This will result in decreased air supply with the potential 
result of soot building up in the flue gas passageways of 
the heat exchanger. Soot behaves as an insulator and 
impairs good heat transfer. Stack temperature will 
increase, and the overall efficiency will decrease. As a 
means of avoiding this problem, it is advisable to adjust 
the air supply to provide no more than a trace smoke 
spot on the Bacharach Scale.  

BEFORE OPERATING THE FURNACE CHECK 
BURNER ALIGNMENT WITH COMBUSTION 
CHAMBER. THE END CONE OF THE AIR TUBE 
MUST BE CENTRED TO THE ACCOMODATING 
RING PROVIDED IN THE DESIGN OF THE 
COMBUSTION CHAMBER. ADJUST AS 
NECESSARY. 

16.  BURNER ELECTRODES 

Correct positioning of the electrode tips with respect 
to each other, to the fuel oil nozzle, and to the rest of 
the burners is essential for smooth light ups and 
proper operation. Refer to the oil burner instructions 
shipped with the furnace for electrode specifications. 

NOTE:

 Beckett AF Series Burner electrode 

specifications have been revised. They should be 
adjusted to be 5/16” above the nozzle centerline.

17.  BURNER PRIMARY (SAFETY) CONTROL 

The furnace is equipped with a primary combustion 
control, sometimes referred to as the burner relay or 
burner protector relay, which uses a light sensing 
device (cad cell) located in the burner housing, to 
monitor and control combustion. Over time, dust or 
combustion residuals can build up on the lens of the 
cad cell impairing its response to the flame. The cad 
cell should be checked for cleanliness and proper 
alignment if the primary control frequently shuts 
down combustion. 

ALL FURNACE CONTROLS ARE SENSITIVE 
AND SHOULD NOT BE SUBJECTED TO 
TAMPERING. IF PROBLEMS PERSIST, CALL 
YOUR SERVICE CONTRACTOR. 

18.  COMBUSTION CHAMBER 

This furnace is equipped with a high quality cerafelt 
combustion chamber. It is held in place by a 
retaining bracket. 

CHECK THE ALIGNMENT OF THE 
COMBUSTION CHAMBER AND OIL BURNER 
BEFORE FIRING. IT IS POSSIBLE FOR THE 
COMBUSTION CHAMBER TO SHIFT IF 
SUBJECTED TO ROUGH HANDLING 
DURING TRANSIT

. 

The combustion chamber 

should be inspected for damage or carbon build up 
whenever the oil burner is removed for repairs or 
routine maintenance.

DO NOT START THE BURNER UNLESS THE 
BLOWER ACCESS DOOR IS SECURED IN 
PLACE. 

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