VAC
24
XFRM
VAC
24
VAC
24
BI
1
BI
2
BI
3
LINK
IMC
+
24
VDC
BI
4
AO1
BI
5
AO2
UI
1
UI
2
AI
3
AI
2
AI
1
AI
4
AI
5
P
1
P
2
IM
C
1
IM
C
1
4
3
2
VAC
24
XFRM
VAC
24
VAC
24
BI
1
BI
2
BI
3
LINK
IMC
+
24
VDC
BI
4
AO1
BI
5
AO2
UI
1
UI
2
AI
3
AI
2
AI
1
AI
4
AI
5
P
1
P
2
CNCNO
BO3
CNCNO
BO2
CNCNO
BO1
RELAYS
ADDRESS
TRIAC SUPPLY TRIACS
A
BO9BO8BO7BO6BO5BO4
A BB
TX
RX
LINK
IMC
SERVI
C
E
SERVICE TOOL
CONNECT AC POWER TO THE TRAIC SUPPLY TO POWER THE TRIACS
BO1 BO2 BO3 BO4 BO5 BO6 BO7 BO8 BO9
1
2
3
4
5
6
7
8
9
IM
C
1
IM
C
1
3
4
5
6
7
1
2
3
4
5
6
7
8
9
8
9
Grou
nd
24 V
ac
Occupancy
(Open Occu)
Condensate
Overflow
(NC)
Low Coil
Temp
Detection
(NC)
Comm In
Comm Out
Supply Fan Speed
Space Temp Setpoint
Space Temp
Ground
Pressure Inputs
Entering
Water Temp
Rela
tive
Humidity Local
or Indoor CO
2
Conc
entration
(Opt)
Supply Fan
Status (NC)
Frost
Detection
Input
Space
Temp
Sensor
Two-Tier
Terminal
Connections
Outdoor Air
Temp
Local
Disc harge
Air Temp
Zone Sensor Service
Tool Connection
Auxiliary 24 Vdc
Output
• BI4 Frost Detect Input used
to detect freeze conditions
that produce frost on the
coil surface.
• UI1 Relative Humidity Sensor
can be used with dehumidifying
unit instead of a BAS-
communicated valve or CO2
Sensor can be used for Demand
Controlled Ventilation instead
of a BAS-communicated value.
•AI5 Entering Water Temp
Sensor used for auto-
changeover units.
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