HVAC Schematic Symbols

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Presentation transcript:

HVAC Schematic Symbols ANSWER SHEET HVAC Schematic Symbols Transformer Contact – normally open Contact – normally closed Pressure Switch – normally open Temperature Switch – normally closed Thermal Overload – normally closed

Split-System Air Conditioner ANSWER SHEET Split-System Air Conditioner Basic troubleshooting Name three (3) things that can cause high head pressure. Dirty Condenser coil Bad Condenser fan Overcharged Air in the system Name three (3) things that can cause low suction pressure. Dirty Evaporator coil Bad evaporator fan Loss of charge Blocked or closed metering device Dirty air filter What may indicate that a TXV is stuck closed? High superheat Low section pressure Compressor hot to the touch What may indicate that a TXV is stuck open? Little to no Superheat Refrigerant flood back Compressor cold or frozen How can you check to see if a fan relay, or contactor, is bad? Ohm out the coil Check the continuity of the dry contacts while energized/de-energized What may cause high amp draw on a blower, or condenser motor? Low voltage Bad capacitor Worn bearings List some possibilities that keep a compressor from operating when you have a proven call for cooling? Bad contactor Off on thermal overload Off on pressure control safety What resistance would you expect to see across a set of closed contacts? None, or zero ohms What voltage would you expect to see between common and terminal “G” with the equipment energized, and the fan in the “on” position? 24 volts