Daikin PreciseLine Series Installation And Maintenance Manual page 45

Figure 74: Sensor Operation Settings
Space CO2 Sensor
Installation
• All wiring must comply with the National Electric Code
(NEC) and local codes. Do NOT run any of this device's
wiring in the same conduit as other AC power wiring.
Tests show that fluctuating and inaccurate signal levels
are possible when AC power wiring is present in the same
conduit as the signal lines. If you are experiencing any
of these difficulties, please contact your Daikin Applied
representative.
• Mount sensor in desired location. The location should be
selected to provide a typical representation of the space
CO2 level. Do no place near heat generating equipment,
operable windows, supply/return duct terminals or other
features that could affect sensor measurement.
• Run (2) minimum 2- conductor wires from the sensor
location to the unit. Daikin Applied recommends using
shielded 22AWG for all connections and a separate
twisted pair for the power wire connections. The shield
should be earth grounded only at the power source.
Larger gauge wire may be required for runs greater than
250'.
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The AC power wiring at terminals [PWR] & [GND] should be
run in a separate twisted shielded pair to avoid fluctuating and
inaccurate signal levels induced into the other sensor signal wires.
This sensor AC power can be run in the same conduit with the sensor signal
wire as long as it's run in twisted, shielded pair and terminated properly.
• Connect the wires to the sensor as follows:
► Blue to PWR - 24VAC Supply
► Green to GND - Ground
► White to CO2/VOC - Space CO2 Input
Figure 75: CO2 Sensors Wire Connections
Detail A
Blue
12" Long
Detail B
Entering/Leaving Water and Space
Temperature Sensor
Mount sensor on water piping as shown in
zip ties. Wrap the sensor and pipe with the insulation.
Ideally the sensor should be located on the water supply line
in an area where there is continuous water flow. This sensor
must be attached correctly on 2-Pipe chilled water/hot water
changeover units for proper unit operation.
45 IM 1267-7 • PRECISELINE AIR HANDLER
Installation
CAUTION
A
Green
White
Circuit Board
B
Figure 76 using the