New Yorker AP-U AP-110U-N, Installation, Operating And Service Instructions

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110839-01 - 8/20

AP-U

Installation & Service Manual

G.  START  OIL  BURNER.

1.  Open vent fitting on fuel pump.
2.  TURN  ‘ON’  BURNER  service switch and 

allow burner to run until oil flows from vent 

fitting in a SOLID stream without air bubbles 

for approximately 10 seconds.

3.  Close vent fitting and burner flame should start 

immediately after prepurge is completed.  

Prepurge prevents burner flame until 10 

seconds has elapsed after initial power is 

applied to burner.  During prepurge the motor 

and igniter will operate but the oil valve will 

remain closed.  Refer to Oil Primary Control 

Instructions for more details.

4.  Adjust oil pressure.

a.  When checking a fuel unit’s operating 

pressure, a reliable pressure gauge may be 

installed in either the bleeder port or the 

nozzle port.  For Beckett burner refer to 

Figure 7-3.  

b.  Locate oil pressure adjusting screw and 

turn screw to obtain proper pump pressure, 

refer to Table 7-1.

c.  To check the cutoff pressure, deadhead a 

reliable pressure gauge onto the copper 

connector tube attached to the nozzle port.  

Run the burner for a short period of time.  

Shut the burner off.  The pressure should 

drop and hold.

d.  Remove the gauge and install bleeder port 

and/or reconnect the nozzle port line.

  WARNING

DO NOT loosen or remove any oil line fittings 

while burner is operating.

H.  ADJUST  OIL  BURNER  WHILE  OPERATING.

(flame present)
1.  SET  ROOM  THERMOSTAT  about 10°F below 

room temperature.

2.  PRESS  RED  RESET  BUTTON  on Oil Primary 

Control and release.

3.  READJUST THE AIR DAMPER SETTING (air 

Band/Air Shutter/Air Gate) on the burner for a 

light orange colored flame while the draft over 

the fire is -0.02”.  Use a smoke tester and 

adjust air for minimum smoke (not to exceed 

#1) with a minimum of excess air.  Make final 

check using suitable instrumentation to obtain 

a CO

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 of 11.5 to 13.0% with draft of -0.02” 

(water gauge) in fire box.  These settings will 

assure a safe and efficient operating condition.  

If the flame appears stringy instead of a solid 

fire, try another nozzle of the same type.  Flame 

should be solid and compact.  After all 

adjustments are made, recheck for a draft of 

-0.02” over the fire.

4.  ADJUST DRAFT REGULATOR for a draft of 

-0.02” (water gauge) over the fire after chimney 

has reached operating temperature and while 

burner is running.

5.   FLAME  FAILURE
  The AP-U boiler controls operate the burner 

automatically. If for unknown reasons the 

burner ceases to fire and the reset button on 

the primary control has tripped, the burner has 

experienced ignition failure. Refer to Oil 

Primary Control features, Paragraph J, Step 2  

of this section and Section XI, Troubleshooting, 

Paragraph B.  If the failure re-occurs, call your 

heating contractor immediately before pressing 

the reset button.

  WARNING

DO NOT attempt to start the burner when 

excess oil has accumulated, when the boiler is 

full of vapor, or when the combustion chamber 

is very hot.

6.  CAD CELL LOCATION AND SERVICE
  The burner is supplied with a cadmium sulfide 

flame detector mounted at the factory, 

Figure 7-3:  Adjusting Fuel Pump Pressure

7

 System Start-Up 

(continued)

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