Johnson Controls METASYS VAV110 Technical Manual page 40

Wiring Sensors
6 0 F 6 1 F 6 2 F
and Actuators
Input and Load
Impedances
40 VAV Controller—Variable Air Volume Controller
Use 18 AWG/1.5 mm
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
Table 11: Sensor Wire Sizes and Lengths
Sensor Type
AI Temperature
AI Voltage
BI Voltage/Contact
Single BO at 0.1 ampere
Single BO at 0.5 ampere
Zone Bus
Zone Thermostat
* 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
AI Voltage 0-2 VDC
0-10 VDC
AI Voltage
AI Temp/Pot 1000 ohm Si, Ni, Pt,
or 0-2k ohm potentiometer
BI DC Sense 0-15 VDC, 2.5V Trig
AO Voltage 0-10 VDC @ 10 mA maximum
24 VAC @ 50-800 mA*
BO AC Triac
2
twisted pair wire for all sensor and output wiring.
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).
Run Length
Feet Meters
500 150
500 150
500 150
500 150
100 30
500 150
100* 30*
Wire Size
AWG mm
18
18
24 to 18 0.6 mm diameter
to 1.5 mm
18
18
18
Eight conductor Eight conductor
phone cable phone cable
DC Input Sensor or
Impedance Load
Impedance
470k ohm 0-5k ohm
128k ohm 0-5k ohm
3540 ohm 0-2k ohm
47k ohm 0-5k ohm
N/A 1K-10M ohm
N/A *30-480 ohm
2
1.5
1.5
2
1.5
1.5
1.5