Metasys UNT Series, Technical Manual

Page: 38 / 96

38 UNT Controller—Unitary Controller (UNT)
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 *30.5 m (100 ft) Eight Conductor Phone Cable
*Note: If a CBLPRO-2 and a Zone Terminal are used, the cable length must be limited
to 15 m (50 ft).
1 2 3 4 5 6
1 2 3 4 5 6 7 8
BINARY IN ANALOG INPUTS BINARY OUTPUTS
70
BINARY INPUT ANALOG INPUTS
1 2 3 4 5 6 1 2 3 4
ANALOG INPUTS
COMMON
+1
5
V
D
C
TO
ZONE
STAT
BINARY OUTPUT
24
V
A
C
1 2 3 4 5 6
+
15V
D
C
24
V
A
C
C
O
MMO
N
C
O
MMO
N
RE
F
N2- N2
+
24V
A
C
CO
M
ZB
U
S
Z BUS
DSI
7 8
TR
A
C
S
24 VAC
1 2 3 4 5 6
C
O
MMO
N
C
O
MMO
N
C
O
MMO
N
untm100c
M100 Motor with
R81CAA-2 Board
HVAC PRO for Windows
indicates the needed address.
COM T1
T2 BUS
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 17: M100C Motor Zone Bus Connection Using an R81CAA-2 Board
M100/R81CAA-2