22 CNT-SVX17G-EN
Inputs and Outputs
Binary Outputs
Each Tracer® VV550/VV551 controller provides five binary outputs (see Table 13). The
binary outputs are load side-switching triacs. Each triac acts as a switch that either makes
or breaks the circuit between the load and ground.
Table 13.Binary output descriptions and wiring
Primary air valve close J1-3 Actuator 12 VA
Primary air valve open J1-4 Actuator 12 VA
Heat 1 J9 Heat 1 12 VA
Heat 2 J10 Heat 2 12 VA
Heat 3 or Fan On/Off J11 Heat 3 12 VA
Binary outputs controlling electric heat are always NO. Binary water valve outputs can
be configured as NO or NC. The factory-installed controller is correctly set up for each
factory-supplied binary output end device. When no device is connected to the output,
configure the controller output as
not used.
Primary Air Valve Binary Outputs
The primary air valve close and open binary output control the modulating primary air
valve. The default minimum actuation drive time for the air valve is 0.5 seconds and the
minimum actuation time for the water valve is 0.5 seconds. The airflow is the calculated
airflow needed to control the zone temperature +/-2% of the configured nominal airflow.
Heat and Fan Binary Outputs
The heat outputs (Heat 1, Heat 2, and Heat 3) control reheat. Output Heat 3 may be
configured for heat or a fan (Fan ON/OFF). The heat outputs may be configured as:
• Hot water ON/OFF c
ontrol (NO or NC);
• Hot water modulating (three-wire) valve control (open and close outputs are
predet
ermined);
• Electric heat pulse width modulation (
PWM) control (always NO).
The fan output can be configured as:
• Parallel ON/OFF co
ntrol;
•Series ON/OFF cont
rol.
Binary Output Overrides
The controller includes a manual output test. The test overrides and manually exercises
all binary outputs in a defined sequence. For more information on manual output test,
refer to “Manual Output Test,” p. 10.
Binary output Terminals Label Maximum
output rating
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