CLCH-SVX06A-EN •
T-Series Climate Changer Air Handler IOM
81
Start-Up
Traq™ Dampers
VCM (Transducer) Calibration
The VCM has an auto-zero function that recalibrates the
transducer once every minute.
Input Power Signal
The only input signal the VCM needs is the 24 VAC power
connected to terminals 1TB1-5 and 1TB1-6.
Output Velocity Signal
The 2 to 10 VDC linear output signal from the VCM represents
air velocity. This voltage can be converted to represent airflow (cfm or L/s) using the
following formula, the altitude adjustment factors in Table 13, and data in your submittal
package.
Traq dampers are low-leak dampers that modulate
and measure airflow. Each Traq damper is supplied
with a factory-mounted ventilation control module
(VCM) on the interior of the mixing box section. The
VCM has an input terminal for power and an output
terminal for air velocity. See
Figure 62
.
Figure 62. Traq damper terminal connections
Ventilation Control
Velocity (2–10 Vdc)
GND
24 Vac
GND
1TB1–3
1TB1–4
1TB1–5
1TB1–6
Module (VCM)
Airflow = k (cfm @ 10V)
or
Airflow = k (L/s @ 10V)
For example, if the VCM on a size 30 T-Series air handler
with back inlet Traq air mixing section at sea level has
a 10-volt signal, it would represent 17,344 cfm (8185 L/
s) through the Traq damper. If the voltage were 6 volts,
airflow through the Traq damper would be 8672 cfm
(4093 L/s).
Table 13. Altitude adjustment factors
Sea level = 1.0
Elevation (feet)
k
1000
0.982
2000
0.964
3000
0.949
4000
0.930
5000
0.914
6000
0.897
7000
0.876
8000
0.860
9000
0.846
10,000
0.825
volts 2
–
(
)
8
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volts 2
–
(
)
8
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