32
UNT Controller—Unitary (UNT) Controller
COM
Z
BUS
24
VAC
REF N2
-
N2
+
BI2 BI3 BI4 BO1 BO2 BO3 BO4 BO5 BO6
24
VAC
24
VAC
TR-
IAC
RTN
RTN
RTN
Triac
Switching
Jumper
LOW
HIGH
wi reunt 2
Jumper allows
field selection
of the supply leg
to be switched
by the triacs.
In this example,
the triacs' BOs
will switch to
the 24 VAC powe
(high side) leg.
On unit mounted controls, OEMs typically minimize
wiring between digital controls and equipment interface
relays by using one leg of the stepdown transformer
as common.
24 VAC
L1 L2
Unit Mounted Control Enclosure
COM
24 VAC
B04
B02
B01
UNT Controller
Triac Switching
Internal Wiring Connections
COMPRESS
Comp.
Relay
Heat
Relay
Fan
Relay
Stepdown
Transformer
HEAT
FAN
COMMON
See
CAUTION
for
Wiring to Unit
Mounted Controls--
UNT110/111 and
UNT120/121
section.
Figure 11: Binary Output Triac Connections on Terminal Strip Versions
of the UNT140/141
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