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Wiring
1. Use Belden #8771 shielded three-conductor cable or equivalent.
2. Connect the RED, BLACK, and WHITE wires to the screw terminals of the CO2 sensor's connector as shown in the image
below.
3. For TEMP OUTPUT wiring connect the BLACK wires to the 0V terminal of the input board. Connect the WHITE wire to the
SIG terminal of the input board. RED wire not used for TEMP OUTPUT; clip and insulate. Connect the SHIELD wire to chassis
ground near the MultiFlex board.
4. For C02 OUTPUT wiring connect the BLACK wires to the 0V terminal of the input board. Connect the WHITE wire to the
SIG terminal of the input board. Connect the RED wire as described in Step 5. Connect the SHIELD wire to chassis ground
near the MultiFlex board.
5. Connect the RED wire to one side of the 24VAC power output of the P/N 640-0039 Class 2 isolated non-center tapped
transformer. Connect the other side of 24VAC output from transformer to the MultiFlex 0V input terminal used for CO2
OUTPUT signal. Do not use the MultiFlex or 16AI power transformer to power the C02 sensor.
6. Locate the input dip switch for the sensor point, and set to the OFF position (LEFT for MultiFlex, DOWN for 16AI).
Refer to the input board's user manual for locations of the input dip switches.
Document Part # 026-4858 Rev 0
©2021 Emerson Digital Cold Chain, Inc. This document may be photocopied for personal use.
Visit our website at www.climate.emerson.com for the latest technical documentation and updates.
LEGEND
1
Power
2
Common
3
Temp Output
9
CO2 Output
Page 5 of 7
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