square and rectangular duct

7/24/2019 Square and Rectangular Duct

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Proper Installation

and Working of

different Air

Conditioning Units


2/13

SQUARE AND RECTANGULAR DUCT

Supply duct

Air handler (blower)

Supply

registersReturn air fromthe occupied space


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Flexible Duct

Supply

Return

Flexible canvas

duct connector


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FLEXIBLE DUCT

Flexible Duct

Supply register


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ELECTRICAL INSTALLATION

Care should be taken whenever working on oraround electrical circuits

Power supply must provide correct voltage andwire sizeSplit systems require two power suppliesThere should be a service disconnect close toeach piece of equipmentControl voltage is obtained through a step-downtransformer


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Wire used for running low voltage control wiring is

color-coded, usually in the range of 18 gage


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INSTALLING THE WINDOW AC

All components are in one cabinet Range from window unit size to over 100 tons

Air-cooled equipment is most common inresidential and light commercial applications

Unit vibration should not be transmitted to thestructure

Duct connections must be water tight andinsulated

Crankcase heat must be energized before thesystem is started up


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INSTALLING SPLIT SYSTEM AIR

CONDITIONERS

Air handler must be secured or mounted properly

Access to the unit must be considered beforeinstalling

Condensate must be properly removed

Average condensate is 3 pints per hour per ton

Auxiliary drain pans

Used when the evaporator is above the conditioned space Piped to a conspicuous location


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Trapped condensate line

Floor drain


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Trapped condensate line

Condensate pump

Condensate pump discharge


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THE SPLIT SYSTEM CONDENSING UNIT

Discharged air must not re-circulate

Piping is connected to the condensing unitfrom the evaporator

Units must be able to be serviced properly

Units should be set on pads

Condensing units should be located in the

shade Noise should not be objectionable


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Piping to and from air

handler

Air must be able to circulate

freely

Unit set on pad

Unit located far from

windows


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square and rectangular duct

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