Wiring diagram hvac unit. Understanding compressor wiring. The ladder diagram is the diagram of choice for troubleshooting. Temperature control hvac thermostats and hvac systems heating and cooling systems always require some kind of control.
Heat pump thermostat wiring a typical wire color and terminal diagram as shown in the diagram you will need to power up the thermostat and the 24v ac power is connected to the r and c terminals. Air handling unit ahu. An air handler is usually a large metal box containing a blower heating or cooling elements filter racks or chambers sound attenuators and dampers.
Word of advice tv 398153 views. The ladder diagram gets its name from the fact that it looks like a ladder and each path the current takes through the apparatus looks like a rung on a ladder. Also details how the parts work and how the electrical works.
Talks about basic electrical wiring and components in a straight cool split type air conditioner. A device used to condition and circulate air as part of a heating ventilating and air conditioning hvac system. Connection diagram g 13 equip gnd l1 11 21 ch comp cont 23 ofm cap l3 schematic diagram ladder form may be factory or field installed 319390 401 rev.
The color of wire r is usually red and c is black. Additional resources thermostat wiring colors code. How to read ac schematics and diagrams basics.
Usually the electrical wiring diagram of any hvac equipment can be acquired from the manufacturer of this equipment who provides the electrical wiring diagram in the users manual see fig1 or sometimes on the equipment itself see fig2. Designed for ac repair technicians. B legend factory power wiring factory control wiring field control wiring field power wiring component connection field splice junction contactor capacitor dual run crankcase heater.
Most hvac units have both types of diagrams affixed to their cabinets. Use our menu to the right to find helpful articles such as thermostat wiring diagrams low voltage circuits for hvac how to wire an air conditioner for control control board troubleshooting and thermostat troubleshooting. Thermostat terminal designations explanations.