Trane Performance Air Handlers Manual de instalación descargar pdf (Pagina 81)

100

CAH-SVX01B-EN 81

Start-Up

Traq™ Dampers

Traq dampers are low-leak dampers that modulate and measure airflow. 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 76). A direct-digital controller controls the factory-mounted and wired actuators.

VCM (Transducer) Calibration. The VCM has an auto-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 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 formula below,

Tab le 5 and Tab le 6.

In Table 6 the cfm at 10Vdc is a 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.

Figure 76. Traq damper terminal connections

Ventilation Control Module

Velocity (2-10 Vdc)

GND

24 Vac

GND

1TB1-3

1TB1-4

1TB1-5

1TB1-6

Table 5. Altitude adjustment factors

Airflow = k (cfm @ 10V)

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 17,335 cfm

(8181 L/s) through the Traq damper. If the voltage were 6 volts,

airflow through the Traq damper would be 8,668 cfm (4091 L/s).

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–()

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volts 2–()

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1 2 ... 76 77 78 79 80 81 82 83 84 85 86 ... 99 100

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Trane Performance Air Handlers Manual de instalación Pagina 81

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