Adams Condensing Oil-Fired Furnace Burner Adjustment, Check vent stack temperatures as below

Drill a 3/8" hole in the PVC exhaust vent piping approximately 18" above where the PVC exits the side of the furnace for your combustion analysis equipment. (Seal with RTV silicone when finished conducting combustion analysis).

BURNER ADJUSTMENT

1)Operate burner for 15 minutes before conducting test work.

2)Adjust burner settings until a trace (0-1 on a smoke scale of 10) is obtained with smoke test pump.

3)Read C02%. This should be approximately 13.0%.

4)Increase air to burner to reduce C02% 1.0 to 1.5% less than where you were able to obtain a trace of smoke.

This procedure allows a margin of reserve for variable conditions.

5)Re-check smoke to insure it is O.

Your final C02% should be approximately 11.5%

Check vent stack temperatures as below:

M	APPROX.	INPUT	THERMAL
	AMBIENT	RATE	EFFICIENCY
0
D	PLUS
	STACK
E
	TEMP F.
L
50	20-24	58,000	97-99%
75	27-31	82,000	95-97%
100	29-33	100,000	94-96%
125	38-42	115,000	92-94%

Temperature Rise

Temperature rise must be within the range below. An incorrect temperature rise may result in condensing in or overheating of the heat exchanger.

Determine and adjUst temperature rise as

follows:

Model	Temp. F.
	Degree Rise
50-2.5	50-60
75-2.5	55-65
100-2.5	60-70
50-5	30-40
75-5	35-45
100-5	45-55
125-5	50-60

1.Operate furnace with burner firing for approXimately ten minutes. Ensure all registers are open and all duct dampers are in their final (fully or partially open) position.

2.Place thermometers in the return and supply ducts as close to the furnace as possible. Thermometers must not be influenced by radiant heat by being able to "see" the heat exchanger

HEAT EXCHANGER

RADIATION "LINE OF SIGHT"

~ SUPPLY

L..,/ AIR

iT'U""

Temperature Rise Measurement

3.Subtract the return air temperature from the supply air temperature to determine the air temperature rise. Allow adequate time for thermometer readings to stabilize.

4.Adjust temperature rise by adjusting the circulator blower speed. Increase blower speed to reduce temperature rise. Decrease blower speed to increase temperature rise.

Set thermostat heat anticipator setting at 0.2 A as a base point. Operate furnace and measure anticipation amperage and adjust thermostat to manufacturer's instructions.

CIRCULATOR BLOWER SPEEDS

This furnace is equipped with a mUlti-speed circulator blower. This blower provides ease in adjusting blower speeds. These blower speeds should be adjusted by the installer to match the installation requirements so as to provide the correct heating temperature rise and correct cooling CFM.

To adjust the circulator blower speed, proceed as follows:

1.Turn OFF power to the furnace.

2.Relocate desired motor leads to the circulator blower terminals on the terminal block as required.

3.Turn ON power to furnace.

4.Verify proper temperature rise as outlined in Section XIV, Startup Procedure and Adjustment - Temperature Rise.

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