561HVACPro
Users Manual
Testing Contactors (Starters)
1.Press Dto select emissivity. Press Ato select LO for bright contacts, or MED for darkened contacts.
2.Press Cand the press Ato select MAX.
3.Measure line and load side of one pole without releasing trigger.
4.A temperature difference between the line and load sides of a pole indicate increased resistance of one point and a contactor may be failing.
Testing Enclosed Relays
1.Press Dand then press Ato set emissivity to LO for uninsulated connectors or HI for plastic encased relays or for bakelite enclosed relays or insulated connectors.
2.Press Cand then press Ato select MAX.
3.Start the scan.
4.Measure the relay casing, looking for hot spots.
5.Measure electrical connections on relay terminals looking for hot spots.
Testing Fuses and Buss Connections
1.Press Dand then press Ato set emissivity to HI for paper covered fuse body or insulated connections.
2.Press Cand then press Ato select MAX.
3.Scan the paper covered length of fuse.
4.Without releasing the trigger, scan each fuse. Unequal temperatures between fuses may indicate voltage or amperage imbalance.
5.Press Dand then press Ato select LO, for metal fuses end caps and uninsulated buss connections.
6.Press Cand then press Ato select MAX.
7.Scan each end cap on each fuse.
Note
Unequal temperatures or a high temperature indicates loose or corroded connection through the fuse buss spring clip.
Testing Electrical Connections
1.Press Dand then press Ato select LO emissivity for uninsulated connectors or buss connections or HI for insulated connections.
Note
Conductors are typically smaller than the Thermometer’s spot size. If the spot size is bigger than the connector, the temperature reading is the average within the spot.
2.Scan the conductor, moving toward direction of electrical connector (quick connect, wire nut, buss connection, or lug).
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