Carrier INDUCTION AIR TERMINALS 36S User Manual download pdf (Page 16)

Sequence of operation

After a mixture of outdoor and return air is conditioned by

the central station air-handling unit, it is distributed through

a high-velocity, high-pressure duct system to the Weather-

master

air terminal units. Here the conditioned primary

(supply) air enters the unit's acoustical plenum, passes

through the balancing damper and exits through the induc-

tion nozzles. The balancing damper handles up to a 3.0 in.

wg pressure drop without adverse effect on the unit sound

power level.

As the primary air leaves the nozzles, it induces a constant

amount of secondary (room) air through the unit's coil. The

secondary air is cooled or heated, depending upon the tem-

perature of the water flowing thru the coil. Primary and

secondary air mix and enter the room through the steel dis-

charge grille.

The unit capacity is controlled either manually or by a

room thermostat that varies the amount of induced room air

recirculating through the coil by means of a bypass damper.

In the illustrations below, the recirculated air is shown by-

passing the coil during part load cooling and 100% bypass.

In units with self-contained controls, the thermostat and

damper are powered by system duct pressure from the unit

plenum. The self-contained controls require a minimum of

1.5 in. wg plenum pressure for satisfactory control

operation.

Depending upon the modular flexibility desired, the build-

ing owner can control up to three damper coils with one

thermostat.

WALL

ACOUSTICAL

PLENUM

INSTALLATION

PLENUM

INDUCTION

NOZZLE

BALANCING

DAMPER

FLOOR

INDUCED

ROOM AIR

ENTERS FROM

BOTTOM AND

FRONT

100% COOLING

(DAMPER CLOSED –

FULL AIR FLOW THRU COIL)

WALL

FLOOR

PART LOAD COOLING

(DAMPER PARTIALLY OPEN –

PARTIAL AIR FLOW THRU COIL)

WALL

FLOOR

100% BYPASS

(DAMPER OPEN – FULL

AIR BYPASS)

BYPASS DAMPER OPERATION

a36-521

Controls

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 25 26

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Carrier INDUCTION AIR TERMINALS 36S User Manual Page 16

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