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Telaire Ventostat™ 8000 Series
Ventostat Wiring Diagrams
The Ventostat family of products has two basic configurations. One
configuration provides three active outputs (CO
2
, RH and temperature)
and an independent thermistor. It has an output terminal block with pins
#1, 2 and 3. The other configuration provides only CO
2
outputs and an
independent thermistor and has no terminal block with pins 1, 2, and 3
installed. For electrical wiring and power supply requirements, these two
configurations are identical; please follow the specific instructions for
wiring. The recommended wire gauge is 18-22 AWG (1.0 to 0.75
metric).
!WARNING!
Ventostat products have three terminal pins that are
connected inside the sensor to a common/ground: pin
#2, 5 and 7 on the I/O terminal blocks and pin #2 on the
power block. Do NOT connect positive (hot) 24 VAC power
line to terminal number 2 of the terminal block.
Caution!
The T8100 Ventostats are either 3-wire or 4-wire type
configurations, powered by either AC or DC voltage. They
are not 2-wire or loop-powered devices. Wiring the units as
2-wire or loop-powered devices will irreparably damage the
sensors and void the warranty.
Note:
For temperature measurements, Ventostat models contain a
passive thermistor (terminal pins #4 and 5), which is
electrically isolated from the other circuitry and should be
wired independently from active CO2/RH/temperature outputs.
The thermistor has no connection to the Ventostat common
ground and/or power.
The active temperature output has the same common (ground)
as CO
2
and RH outputs.
Figure 1: Display Unit Wiring for 3-Wire System, AC
Power
Figure 2: Display Unit Wiring for 4-Wire System, AC
Power
Figure 3: Non-Display Unit Wiring for 3-Wire System,
AC Power
Figure 4: Non-Display Unit Wiring for 4-Wire System,
AC Power
Figure 5: Wiring CO
2
Sensor Voltage Output to
Honeywell M7415 Damper Actuator with W7459 Logic
Module
