Carrier 50UA-UH 135 - Unit Options: Economizers and Dampers; Economizer Options; Manual Outside Air Damper

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When the outdoor conditions are maintained based on
TEMPERATUREORENTHALPYDEPENDINGONTHEOPTIONlTTED
free cooling can be provided using fresh air. The economizer
ISFACTORYlTTEDANDTESTEDBEFORELEAVINGTHEFACTORYSEE
Fig. 15).
The return air damper is operated by a 24 V actuator, and
the fresh air damper is mechanically linked to this damper
to open or close at opposite angles. During start-up, the
return air damper is fully open, while the fresh air damper
is fully closed.
4HEOPTIONALSOINCLUDESAFACTORYlTTEDFRESHAIRHOODTHAT
is folded during transportation to limit risks of damage
ANDMUSTBEUNFOLDEDONSITE0LEASEREFERTOTHECERTIlED
drawings and wiring diagrams for the mechanical and
electrical connections of the economizer and to the Touch
Pilot Control IOM for further information.
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Economizer
Dampers
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Damper with direct link driven blades, can be preset to
admit up to 40% outside air into the return-air compart-
ment. To adjust, loosen the securing screw and rotate the arm
of the damper blades to the desired setting. Then retighten
the screw to secure the damper blades (see Fig.16). It also
INCLUDESAFACTORYlTTEDFRESHAIRHOOD
Manual outside air
damper
Adjusting arm
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