Thermo Products ome-72d36 CAD Cell Checkout Procedure, Heat Exchanger Cleaning Instructions

All installations and services must be performed by qualified service personnel.

B.CAD CELL CHECKOUT PROCEDURE:

1.Remove cad cell lead wires, then start the burner. Shortly after burner starts, place a temporary jumper between terminals f & f of the oil primary control. Connect ohmmeter across cad cell lead wires - resistance should be less than 1600 ohms.

2.Stop the burner and remove temporary jumper.

3.With the burner off, check dark cell resistance across cad cell lead wires. Resistance should be greater than 20,000 ohms. If cell resistances are different from above, recheck wiring, location of cell, etc. If necessary, replace plug in portion of cell, (Part No. 350104).

4.Reconnect cad cell lead wires. Check out the oil primary control according to the instructions packed with the control.

C.HEAT EXCHANGER CLEANING INSTRUCTIONS

: The heat exchanger must be cleaned by a qualified service person.

For oil-fired units, it is important to inspect and clean the heat exchanger once a year, or as necessary, to remove any build-up of soot. A layer of soot on the inside of the heat exchanger will act as an insulator, reducing heat transfer, resulting in reduced efficiency

To clean the heat exchanger,

1.First, turn off all power to the unit.

2.Remove cleanout plugs, the vent connector pipe to the chimney, the burner and the burner mounting plate.

3.With access to the inside of the heat exchanger through the burner cleanout openings and the vent pipe connection, it is now possible to use a long, flexible wire brush and an industrial-type vacuum cleaner to remove any soot build-up.

NOTE: A one inch (outside diameter) vacuum cleaner hose will fit into the radiator.

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