Bradford White UPDX2-75T6FRN - Manual (Page 32)

UPDX Series
Page 32
Flammable Vapor
Sensor
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.
Flammable Vapor Sensor Testing
Flammable Vapor Sensor
Electronic
“pin type”
Meter Probes
Multi-meter set to
ohms setting
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.
(The following chart is for models with serial numbers starting with “J” or earlier.)
Flammable
Vapor Sensor
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.
Multi-meter set to
ohms setting
(The following chart is for models with serial numbers starting with “K” or later.)
Gas Control shown in the “OFF” Position
Resettable Thermal
Switch Wiring
UPDX SERVICE PROCEDURE IX
Flammable Vapor Sensor Testing
32