HVAC SCHEMATIC SYMBOLS

single pull single throw switch

single pull double throw switch

double pull single throw switch

ground switch 

Capacitor

Temperature switch

normally open contact 

transformer

normally closed contact

double pull- double throw switch

pressure switch

liquid level switch

circut breaker

resistor 

Time-delay relay

heater

fusable length

fuse

thermal overload switch 

inline overload switch

flow switch

push button switch

thermistor switch

humidistat switch 

evaporator fan motor

crankase heater

single phase compressor

3 phase compressor

light

condensor fan motor

relay coil

reversing valve solenoid

thermal overload

disconnect

squirrel cage induction

red light

fuse

single pull contactor

thermal relay

thermal circut breaker

magnetic relay

3 pull contactor

therma couple 

3 position switch

magnetic circut breaker