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Additional components
CNT-SVX07C-EN 5
returns the valve to normally open or closed (dependent on the desired
default position). For modulating valve control, use tri-state modulating
actuators with or without a spring return, as required by the application.
Damper actuators
Damper actuators cannot exceed 12 VA draw at 24 Vac. For control of out-
door/return air dampers, use tri-state modulating actuators that incorpo-
rate a spring return.
Zone humidity sensor
For measurement of relative humidity (RH), the Tracer ZN521 requires a
zone humidity sensor with a 4–20 mA output, where 4 mA is 0% RH and
20 mA is 100% RH. The controller provides 20 Vdc to power the zone
humidity sensor.
CO
2
sensor
For CO
2
measurement, the Tracer ZN521 requires a CO
2
sensor with a 4–
20 mA output, where 4 mA = 0 ppm and 20 mA = 2000 ppm.
Table 1. Tracer zone temperature sensor options
BAS
order
number
Use
Fan Zone
Timed
override
buttons
Comm
jack
High Med Low Auto Off
Setpoint
thumb-
wheel
Temperature
sensor
On Cancel
4190 1087 Any x
4190 1088 Any x x x x
4190 1090 Any x x x x x
4190 1094 Any x x x
4190 1095 Unit
ventilator
xxxxxxxx
4190 1115 Fan coil x x x x x x x x x x
4190 1116 Unit
ventilator
xxxxxxxxx
4190 1117 Any x x x x x x x