Lennox International Inc O23V5-154, O23V5-140, O23V-70, O23V4-120, O23V-105 Adjusting Limit Control

Beforestartingunit,makesuretheoiltankisadequately filledwithcleanNo,1orNo,2furnaceoil,

NOTE - Water, rust or other contaminants in oil supply sys- tem will cause malfunction and failure of the internal parts of the fuel pump.

CAUTION

Table 7

	Nozzle Size,			Input	Output		Temp
O23V	Spray Angle,		Pump	Rating	Rating		Rise
Unit	& Pattern		PSIG	BTU/Hr	BTU/Hr	Head	F°
-70	.50GPH-80	° A	100	70,000	57,000	FB0	60-70
-90	.65GPH-80	° B	100	90,000	72,000	FB0	60-70
-105	.65GPH-80	° B	140	105,000	84,000	FB3	65-75
-120	.75GPH-80	° B	140	119,000	105,000	FB3	70-80
-140	.85GPH-80	° B	140	140,000	112,000	FB6	65-75
-154	1.0GPH-80	° B	140	154,000	125,000	FB6	70-80

1, Set thermostat for heating demand and turn on electri- cal supply to unit,

2, Check initial air adjustment, All units are equipped with an air adjustment dial on the right side of the burner, See burner parts arrangement illustration.

3, Turn unit on. Place a can or container under the bleed port located on the fuel pump. Loosen nut on bleed port to release air and oil mixture from fuel line. Allow mixture to escape until a steady stream of oil is emitted from the port. Drain at least 1/2 pint of oil from the pump, Retighten the nut on bleed port. If lockout oc-

curs, press reset button and continue with bleed pro- cedure,

NOTE - A two-pipe fuel system will normally bleed it- self by forcing air back to the tank through the return line. This type of bleeding procedure is not necessary.

4, If burner fails to start, push reset button on primary safety control and the burner motor reset button. See part arrangement illustration,

CAUTION

5, If the burner fails to light again, refer to the trouble- shooting section in this manual,

Measuring Fuel Pump Pressure

Measure fuel pump pressure with unit off. Attach pressure gauge to pump outlet, Turn unit on and check pressure and compare to table 7. Adjust if necessary,

Measuring Temperature Rise

To measure temperature rise, place plenum thermometers in warm air and return air plenums, Locate thermometer in warm air plenum where thermometer will not "see" the heat exchanger to prevent it from picking up radiant heat. Set thermostat to its highest setting to start unit, After plenum thermometers have reached their highest and steadiest readings, subtract the readings, The difference in temper- atures in the supply and return air plenums should approxi- mate the temperature rise range listed in table 7 and the appliance rating plate, If the rise is above the range shown in the table, check for high static pressure.

Adjusting Limit Control

DO NOT adjust limit control - it is preset at the factory,

Adjusting and Testing Burner

The following instructions are essential to the proper op- eration of O23V series oil furnaces, To prevent sooting, these instructions must be followed in sequence:

1, Draft--This test should be taken at the breach be- tween the outlet of the vent connector and the baro- metric draft control. Generally a 1/4" hole will need to be drilled for the draft gauge to be inserted into the vent connector.

A minimum of 0,03 draft must be established without

the burner in operation. With the burner in operation, the draft should be 0,04 to 0.05. This is VERY critical to the flame retention head burners.

Oil furnace installations also require careful inspection to make sure the chimney is in good shape and can ac- commodate the products of combustion, The temper- ature in the unconditioned space will also affect the draft if long vent connectors are allowed to get too cold,

2.Overfire Draft--This test should be taken with the burner in operation. Remove the screw from the center of the inspection port, Insert your draft gauge into the hole.

A reading of the overfire draft should be 0.02 less than the reading found in the vent connector. If a positive reading is seen at this point, the combustion fan is

pumping too much air into the heat exchanger. Make the necessary adjustments at the air adjustment dial.

3, Smoke Test--The smoke test should be taken at the hole drilled in step 1,

Using a smoke test gun adjust the air inlet shutter so that you will have just a trace of smoke, Somewhere between a 0 and #1 smoke, This is the starting point, Do not stop here.

4, CO2 Test--Again, take this sample at the vent pipe, With the unit firing at a trace of smoke, take a sample of the CO2, From the results of this test, a "window of op-

eration" will be determined. This window of operation establishes some tolerance, The tolerance the install-

er builds in provides room within the set-up for those things which might affect combustion. Those things which might affect combustion can then do so without

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O23V SERIES