Marvair AVP 24 Manuel télécharger pdf (Page 16)

ComPac 6/09-18

1.9 eConoMizer CoMponenTs (CoMpaC

ii a/C only)

Damper Actuator:

The damper actuator is a 24V motor that modulates the position of the damper blade. It is capable

of driving a full 90 degrees within 90 seconds. The assembly has a spring return to close the damper

during power outage.

Controls:

The economizer is controlled by the H205A enthalpy control or optional dry bulb sensor.

H205A Economizer Changeover Control:

The H205A enthalpy controller responds to the total heat content of the outdoor air to provide changeover

to outside air for free cooling. The change point (factory set at "D") is adjustable from 53°F @ 50%

RH (full counterclockwise) to 78°F @ 50% RH (full clockwise). Refer to Figure 4 and Figure 5.

Once the H205A has selected outside air, the mixed air sensor will limit the air temperature delivered

to the space by modulating the damper blade to "mix in" a quantity of inside air to provide a constant

50° to 56°F. (Adjustable minimum potentiometer, part number 70012, is optional.)

Figure 4. H205A Temperature Control Points

CONTROL CONTROL POINT*

CURVE AT 50% RH

A 72°F/23°C

B 68°F/20°C

C 63°F/17°C

D 58°F/14.5°C

Full CCW is 55°F

*Approximate Deg.

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 37 38

Pas de commentaire

Marvair AVP 24 Manuel Page 16