40 VAV Controller—Variable Air Volume Controller
Use 18 AWG/1.5 mm
2
twisted pair wire for all sensor and output wiring.
Shielding is not required but, if used, earth ground the shield at the
transformer or the controller. You may use 24 AWG/0.6 mm diameter wire
in some applications. However, the length of wire is reduced due to the
resistance. To minimize sensor error caused by field wiring, the total
resistance of all resistive sensor wiring should be less than 3 ohm.
!
CAUTIONS: Potential Controller Malfunctioning.
..Do not run AI, BI, AO, BO, ZBus, or N2 Bus wiring in the same conduit
as wiring carrying
30 VAC or more.
Do not run AI, BI, AO, BO, ZBus, or N2 Bus wiring
in the same conduit as wiring that switches power to
highly inductive loads (such as contactors, coils,
motors, or generators).
Table 11: Sensor Wire Sizes and Lengths
Sensor Type Run Length Wire Size
Feet Meters AWG mm
2
AI Temperature
500 150 18 1.5
AI Voltage
500 150 18 1.5
BI Voltage/Contact
500 150 24 to 18 0.6 mm diameter
to 1.5 mm
2
Single BO at 0.1 ampere
500 150 18 1.5
Single BO at 0.5 ampere
100 30 18 1.5
Zone Bus
500 150 18 1.5
Zone Thermostat
100* 30* Eight conductor
phone cable
Eight conductor
phone cable
* Note: If an AS-CBLPRO-1 and a Zone Terminal are used, the cable length must be limited
to 50 feet/15 meters.
Table 12: Input and Load Impedances
Function
Range
DC Input
Impedance
Sensor or
Load
Impedance
AI Voltage
0-2 VDC 470k ohm 0-5k ohm
AI Voltage
0-10 VDC 128k ohm 0-5k ohm
AI Temp/Pot
1000 ohm Si, Ni, Pt,
or 0-2k ohm potentiometer
3540 ohm 0-2k ohm
BI DC Sense
0-15 VDC, 2.5V Trig 47k ohm 0-5k ohm
AO Voltage
0-10 VDC @ 10 mA maximum N/A 1K-10M ohm
BO AC Triac
24 VAC @ 50-800 mA* N/A *30-480 ohm
60F61F62FWiring Sensors
and Actuators
Input and Load
Impedances
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