Cad Cell Checkout Procedure - Thermo Pride GMC-85 Installation And Service Manual

All installations and services must be performed by qualified service personnel.
B. CAD CELL CHECKOUT PROCEDURE: (OMC ONLY)
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.
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