Flammable Vapor Sensor Testing - Bradford White UPDX series Service Manual

UPDX SERVICE PROCEDURE IX

Flammable Vapor Sensor Testing

Flammable Vapor Sensor Testing
Step 1. Position gas control power switch to
the "OFF" position.
Step 2. Disconnect flammable vapor sensor
from gas control.
Step 3. Using a multi-meter set to the ohms
setting check resistance of
flammable vapor sensor (see
caution below). Resistance must be
within 3,000 ohms and 48,000 ohms.
If outside of this range replace
flammable vapor sensor.
(The following chart is for models with serial numbers starting with "J" or earlier.)
(The following chart is for models with serial numbers starting with "K" or later.)
Multi-meter set to
ohms setting
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Gas Control shown in the "OFF" Position
Multi-meter set to
ohms setting
Electronic
"pin type"
Meter Probes
Electronic
"pin type"
Meter Probes
CAUTION
DO NOT use standard multimeter probes for this test. Doing
so will damage connector. Use special electronic "pin type"
probes or small diameter wire pins inserted into connector.
Flammable Vapor Sensor
CAUTION
DO NOT use standard multimeter probes for this test. Doing
so will damage connector. Use special electronic "pin type"
probes or small diameter wire pins inserted into connector.
UPDX Series
Flammable Vapor
Sensor
Resettable Thermal
Switch Wiring
Flammable
Vapor Sensor