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Chapter 4 Input/output functions and wiring for typical applications
28 CNT-SVX07C-EN
Figure 12. Two-pipe heating unit with DX cooling
LED
A BBA
AI4+20 GND
AI2 AI3FAN GND AI1
ZN
GND
LED
SET
PIN
ZONE SENSOR
SERVICE
ANALOG INPUTS COMM5
COMM5
AC POWER
24V24V
GND
24V
BINARY INPUTS
BI3BI1 BI2 BI4
BINARY OUTPUTS
21 43 765 8 9
LED
STATUS10
5
4
3
2
1
On
Cancel
6
}
LonTalk
in
Entering water
temperature
Outdoor air or generic temperature
24 V
†
Exhaust (or fan, medium speed)
24 V
†
Fan, low speed
24 V
†
Fan, high speed
Low-coil-temperature detection
(closed=normal)*
Condensate overflow (closed=normal)*
Occupancy (open=occupied)*
LonTalk
H
N
24 Vac
24 V
†
Generic/baseboard heat
24 V
†
DX cooling
out
Fan status (closed=on)*
24 V
†
Outdoor air damper actuator
Discharge air
temperature
24 V
†
Heating valve
Open
Close
Open
Close
* All binary inputs are configurable.
†
Connect 24 V to an AC POWER (24V) terminal.
AI4 input: See
Figures 5 and 6
on page 20 for
wiring options