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SERVICE BULLETIN
ON THE
OXYGEN DEPLETION SYSTEM

In 1983 all gas space heaters were required by U.S. government regulations to be equipped with an OXYGEN DEPLETION SYSTEM (ODS). The ODS pilot burner is a highly sensitive device which is designed to shut off a heating appliance if the oxygen level in an area falls below 18%. The standard oxygen level is 21%.

Because the ODS is a high sensitive device it must be properly maintained and adjusted. PERIODIC CLEANINGS IS A NECESSITY DUE TO ACCUMULATIONS OF LINT AND DUST IN THE PILOT BURNER! There are also times when the air shutter must be adjusted in order to facilitate proper flow to the pilot burner.

CLEANING THE ODS PILOT BURNER

A. The pilot will burn correctly, as shown below, when it is properly cleaned.


(straight flame across the tip of the thermocouple)

B. The pilot will look like this if it is not burning correctly (due to collection of lint).


(yellow flame is raised from tip of thermocouple)

How to clean lint and dust out of the pilot burner:

The lint can be blown out by using a small tube, hose, drink straw or can of compressed air. Direct the air source into the flame end of the pilot burner. Gently lift the air shutter, being careful not to permanently bend the bimetal. While gently lifting the air shutter back, blow high pressure (or whatever pressure is available) air toward the lifted air shutter.

BE CAREFUL NOT TO TOUCH OR DAMAGE THE RUBY ORIFICE

ADJUSTING THE BIMETAL AIR SHUTTER

Casual pilot outage is sometimes caused by the air shutter opening too wide. When this occurs excessive air enter the pilot, causing the flame to lift off the thermocouple. Correction can be made by adjusting the tip of the shutter bimetal. The gap between the bimetal and the pilot tube should be 1/4" (+\- 1/16"). This gap can easily be corrected with a screwdriver inserted between the bimetal and the pilot tube.


ODS Pilot Assembly                       Bimetal Air Shutter Adjustment
  


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