Traq Damper Terminal Connections; Altitude Adjustment Factors; Vcm (Transducer) Calibration; Input Power - Trane CSAA Installation, Operation And Maintenance Manual

Figure 167. Traq damper terminal connections

VCM (Transducer) Calibration.

zero function that recalibrates the transducer once every
minute. When troubleshooting, allow for the recalibration
time before making any measurements.

Input Power.

The only input the VCM needs is the 24 Vac
power connected to the J2 plug (green and black wires).
Output Velocity Signal.
signal from the VCM represents air velocity. This voltage
can be converted to represent airflow (cfm or L/s) using the
formula below and Table
Table 43. Back or top inlet standard Traq damper-air mixing and indoor economizer section
Unit Size Part Number
3 495100860001
4, 6 495100860001
8, 10 495100860001
12, 14, 17 495100870001
21, 25 495100890001
30, 35, 40 495100880001
50, 57 495100900001
66 495100900001
80 495100900001
100, 120 495100900001
CLCH-SVX07K-EN
The VCM has an auto-
The 2 to 10 Vdc linear output
42.
Traq Damper
Size (inches) Quantity
13 1
13 2
13 3
16 3
20 3
24 3
28 3
28 4
28 5
28 6
Airflow = k (cfm @ 10V)
or
Airflow = k (L/s @ 10V)
For example, if the VCM on a size 30 air handler at sea
level (k=1) has a 10-volt signal, it would represent
24,492 cfm (11,559 L/s) through the Traq damper. If
the voltage were 6 volts, airflow through the Traq
damper would be 12,246 cfm (5779 L/s).
Table 42. Altitude adjustment factors
Sea level = 1.0
Elevation (feet)
1000
2000
3000
4000
5000
6000
7000
8000
9000
10,000
In Table 43 through Figure
calculated value based on area and peak velocity. In certain
situations, it can be advantageous to raise the velocity of
air through the remaining Traq dampers by closing off one
or more dampers in the unit. The cfm at 10Vdc can be
recalculated based on the proportion of remaining Traq
dampers or by multiplying the remaining area of dampers
by peak velocity. Calculations are based on VCM voltage
versus airflow at sea level. Setup details are available on
the HUB - DOC-106531.
Peak Velocity Total Area
2
(fpm) (ft )
2475 0.92
2475 1.84
2475 2.76
2475 4.19
2600 6.54
2600 9.42
2600 12.83
2600 17.10
2600 21.38
2600 25.66
Start-Up
 volts 2 
–
------------------------------
8
 volts 2 
–
------------------------------
8
k
0.982
0.964
0.949
0.930
0.914
0.897
0.876
0.860
0.846
0.825
50, the cfm at 10Vdc is a
CFM @ 10VDC L/s @ 10VDC
Peak Velocity Peak Velocity
2279 1076
4559 2151
6838 3227
10,365 4891
17,012 8028
24,492 11,558
33,358 15,742
44,460 20,981
55,588 26,232
66,716 31,483
133