36
UNT Controller—Unitary (UNT) Controller
Table 12: Sensor Wire Sizes and Maximum Lengths
Sensor Type
18 AWG Wire Size Run
Length In Meters (Feet)
24 AWG Wire Size Run
Length In Meters (Feet)
AI Temperature (Resistive)
152.4 m (500 ft) 30.5 m (100 ft)
AI Voltage
152.4 m (500 ft) 30.5 m (100 ft)
BI Voltage/Contact
152.4 m (500 ft) 152.4 m (500 ft)
Single BO at 0.1 A
152.4 m (500 ft) 3.0 m (10 ft)
Single BO at 0.5 A
30.5 m (100 ft) 6.1 m (20 ft)
Zone Bus*
152.4 m (500 ft) 15.2 m (50 ft)
Zone Thermostat*
152.4 m (500 ft) 30.5 m (100 ft)
* If a CBLPRO
-
2 and a Zone Terminal are used, the cable length must be limited to
15.2 m (50 ft).
1 2 3 4 5 6
1 2 3 4 5 6 7 8
BINARY INANALOG I NPUTS BI NARY OUT PUT S
TM
BI NARY INPUT
ANALOG I NPUTS
1 2 3 4 5 6 1 2 3 4
ANALOG INPUTS
COMMON
+15VDC
TO
ZONE
STAT
BINARY OUTPUT
24VAC
1 2 3 4 5 6
+15VDC
24VAC
COMMO N
COMMO N
REF
N2-
N2+
24VAC
COM
ZBUS
Z BUS
DSI
7 8
TRACS
24 VAC
1 2 3 4 5 6
COMMO N
COMMO N
COMMO N
untm100c
M100 Motor with
R81CAA-2 Board
HVAC PRO for Windows
indicates the needed address.
COM T1
T2BUS
CW
CCW
ZBUS
COM COM
24
VAC
UNTxxx-1
shown here.
Zone Bus
Address Switch
Set address to 22.
1 2 3 4 5 6 7 8
O
N
If the same transformer is
used for both the UNT
and M100 boards, ensure
that polarity is correct,
i.e., COM connected to T1,
to avoid shorting the
transformer.
CAUTION:
Note: When you connect an M100C
actuator to the Zone Bus, we
recommend powering it with a
separate 24 VAC transformer.
Figure 14: M100C Motor Zone Bus Connection Using an R81CAA-2 Board
M100/R81CAA-2
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