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HVACR317 – Core for Refrigeration - PowerPoint PPT Presentation


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HVACR317 – Core for Refrigeration. Symbols 2. THE COIL OF THE CONTROL RELAY MUST ENERGIZE FIRST BEFORE THE ASSOCIATED CONTACTS CLOSE. THE COIL OF THE CONTROL RELAY MUST ENERGIZE FIRST BEFORE THE ASSOCIATED CONTACTS CLOSE.

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Presentation Transcript
slide5

CONTACTS:

SPST - Single Pole Single Throw

SPDT - Single Pole Double Throw

DPST - Double Pole Single Throw

DPDT - Double Pole Double Throw

slide7

OVERLOAD PROTECTION

MOTOR STARTER

slide8

MOTOR STARTER

M1

L1

T1

L1

L2

T2

L2

L3

T3

L3

OVERLOAD PROTECTION

M1

OL

OL

OL

2

3

motor starter overload components

OVERLOAD HEATERS

OVERLOAD CONTACTS

MOTOR STARTER OVERLOAD COMPONENTS

slide10

MOTOR STARTER

M1

L1

T1

L1

L2

T2

L2

L3

T3

L3

M1

OL

OL

OL

2

3

electric resistance heaters

ELECTRICAL ENERGY CONVERTS TO HEAT

ELECTRIC RESISTANCE HEATERS

slide13

L1

N

S-1

R

fuses overload protection devices

PROTECTION UP TO FUSE RATING

FUSES

(OVERLOAD PROTECTION DEVICES

capacitors

RATED IN FARADS

CAPACITORS

compressor wiring diagram

CURRENT RELAY

COMPRESSOR WIRING DIAGRAM

compressor wiring diagram1

CURRENT RELAY

Cut-In Amps

Cut-Out Amps

AMPS

COMPRESSOR WIRING DIAGRAM

TIME

psc motor permanent start capacitor
PSC MOTOR

PERMANENT START CAPACITOR

thermostats

CLOSES ON TEMP FALL

HEATING THERMOSTAT

CLOSES ON TEMP RISE

COOLING THERMOSTAT

THERMOSTATS

low pressure control switch

SYSTEM PRESSURE ACTS ON DIAPHRAGM

LOW PRESSURE CONTROL SWITCH