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Installation and Maintenance 27
Traq Dampers
Traq dampers are fitted in mixing sections in several
possible configurations. These low leak dampers
modulate and measure air flow.
Each Traq damper section is supplied with a factory-
mounted ventilation control module (VCM) on the
interior of the mixing box. The VCM has an input
terminal for power and an output terminal for air
velocity. (See
Figure 22
.)
Figure 22
Traq Damper Terminal Connections.
The actuators, factory-mounted or field-supplied, are
separately wired and controlled by a PCM or other
building logic.
Figure 23
illustrates the typical quick
connect scheme.
Figure 23
Typical Quick Connects with Wiring Identification
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 TB5 and TB6.
Output Velocity Signal
The 2 - 10 VDC linear output signal from the VCM
represents air velocity. This voltage can be converted
to represent cfm or L/s using the formula and
Table
26
following. For example, if the VCM on a Size 21
T-Series Climate Changer has a 10-volt signal, it
would represent 16650 cfm (7859 L/s) through the
Traq damper. If this voltage is 6 volts, air flow through
the Traq damper would be 8325 cfm (3930 L/s).
Using the formulas
cfm = k (cfm @ 10V) [volts-2/8]
L/s = k (L/s @ 10V) [volts-2/8], and tables following
VCM
Velocity (2-10 VDC)
GND
24 VAC
GND
1TB1-3
1TB1-4
1TB1-5
1TB1-6
TSC Size cfm @ 10V L/s @ 10V
3
2304 1087
6
4609 2175
8
4609 2175
10
6913 3263
12
10900 5145
14
10900 5145
17
10900 5145
21
16650 7859
25
10900 5145
30
24970 11786
35
24970 11786
40
24970 11786
50
34630 16345
66
46200 21806
80
57820 27291
100
69270 32695