Thermo Products PHCFA072DV4R operation manual

k.CARBON DIOXIDE (CO2) OR OXYGEN (O2): Take a CO2 sample from flue passageway. It is possible to achieve readings of up to 14% CO2 (or 2% O2), but it is recommended to have a lower CO2 (or higher O2) reading with zero smoke measured. To achieve a lower CO2 reading, open the air plate on the burner until zero smoke is measured. A CO2 of 11-1/2% is recommended.

For example, if a 13% CO2 (or 3.5% O2) is recorded at a trace of smoke, open the air shutter until zero smoke is measured with a 11-1/2% CO2 (or 4.5 O2).

Adjustment of the burner to achieve a slightly lower CO2 reading is recommended, although it slightly reduces combustion efficiency, to keep the heating system within normal operating conditions though external conditions may vary. Some “out-of- spec” conditions which may adversely affect burner performance are, low oil supply temperature, dirty (contaminated) oil, low heating content (BTU/gal) oil, cold heat exchanger surfaces, and downdraft conditions. By adjusting the burner in this manner, an operational tolerance is established by allowing the burner to function well, even under less than ideal conditions. This results in less service and maintenance during a heating season.

l.Removing the draft over fire cap allows for flame inspection and over fire pressure measurement. The over fire pressure will be negative and will vary depending on the final combustion set-up. If the over fire pressure is positive, shut down the burner and make certain the inducer is operating and that the vent system meets the installation requirements on page 9

and 10.

m. Temperature rise is equal to the supply air temperature minus return air temperature. Under steady state operating conditions, the temperature rise across the heating section should be approximately between 550F and 850F. A higher temperature rise will slightly lower the heating efficiency.

The supply air temperature should be measured in the supply air trunkline approximately 12 inches downstream of the supply air outlet of the appliance.

NOTICE: Minimum temperature rise is 550 F.: maximum temperature rise is 850 F.

NOTICE: Minimum return air temperature is 550 F.

n. After final adjustments are completed, tighten all screws to fix the positions of the burner air band and replace the plastic plug.

o. Check for the presence of oil leaks. Correct any leaks found.

p. Reassemble the burner compartment cover and replace the draft pipe cap.

q. Start and stop the unit several times while checking for proper ignition of the burner. The flame should ignite and stabilize without any significant rumbles or pulsations.

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