3-26 | Thermox WDG-V / VC / VCM with Blow Back
Remote Calibration Unit (RCU) Connections
If you don’t have the remote calibration unit (RCU) option, skip this sec-
tion.
Oxygen-Only Remote Calibration Unit Connections
Oxygen-Only Remote Calibration Unit (RCU) connections on the WDG-V
wiring card, and their RCU connections, are as follows:
- ZERO GAS - WDG-V Terminal Z to Pin 13 on RCU
- ASPIRATOR - WDG-V Terminal A to Pin 14 on RCU
- O
2
SPAN - WDG-V Terminal S1 to Pin 15 on RCU
- VALVE COMMON - WDG-V Terminal ‘V’ to pin 16 on RCU
Combustibles Remote Calibration Unit Connections
If you have the combustibles option (and a combustibles RCU), you must
also make the following connection:
• COMBUSTIBLE SPAN - WDG-V Terminal S2 to Pin 17 on RCU
For a WDG-VCM with hot-wire detector, Remote Calibration Unit con-
nects:
• METHANE SPAN - SWDG-V Terminal S3 to Pin 18 on RCU
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