Binary outputs for water-source heat pump applications
CNT-SVX06B-EN 21
AI2: Discharge air temperature
The AI2 analog input functions as the local (hardwired) discharge air
temperature input. The discharge air value is used for information and
troubleshooting only and does not affect the operation of the controller.
The controller receives the temperature as a resistance signal from a
10 kΩ (thermistor wired to AI2). A communicated discharge air tempera-
ture value can also be used for controllers operating on a BAS. When both
a hardwired and communicated discharge air temperature value is
present, the controller uses the communicated value. If a valid hardwired
or communicated discharge air temperature value is established and then
is no longer present, the controller generates a Discharge Air Temp Fail-
ure diagnostic.
Binary outputs for water-source heat
pump applications
The heat pump configuration supports applications with the following
components:
• A single-speed supply fan
• A reversing valve
• One or two compressors
• A two-position outdoor air ventilation damper (optional)
A Tracer ZN511 zone controller has six binary outputs. Each binary out-
put is a relay with an output rating of 12 VA. Table 5 describes the func-
tion of each output for water-source heat pump applications.
Note:
Neither AI1 nor AI2 is polarity sensitive; you can connect either
terminal to either sensor lead.
Table 5. Binary outputs for water-source heat pump applications
Binary output
terminal label
Function
1Fan
2 Reversing valve
3Not used
4 Compressor 1
5 Compressor 2
6 Two-position outdoor air damper
or generic binary output
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