Trane Tracer ZN521 Installation And Operation Manual page 22

Input/output functions and wiring for typical applications
Figure 9. Two-pipe hydronic heating/cooling unit with auto changeover
Condensate overflow (closed=normal)*
Low-coil-temperature detection
(closed=normal)*
H
24 Vac
N
22
Fan status (closed=on)
Occupancy (open=occupied)*
Entering water
LonTalk
temperature
Discharge air
temperature
†
24 V
Fan, high speed
†
24 V
Exhaust (or fan, medium speed)
24 V
Fan, low speed
*
AI4 input: See
Figures Step 5
and Step 6 on
p. 18 for wiring
options
Outdoor air or
generic temperature
* All binary inputs are configurable.
† Connect 24 V to an AC POWER (24V) terminal.
†
†
24 V
Heating/cooling changeover valve
†
24 V
Electric heat, stage 1 (optional)
†
24 V
Electric heat, stage 2 (optional)
†
24 V
Outdoor air damper actuator
†
24 V
Generic/baseboard heat
LonTalk
in
out
CNT-SVX07D-EN