![]() The heat source for a basic ac system can include heat strips for electric heat or even a hot water coil inside the air handler that is fed from a water heater. Locating that transformer and identifying the c common and r wires is likely the first thing you need to do before you begin wiring your thermostat. Thermostat terminal designations explanations. The transformer that steps down the house voltage to low voltage is usually mounted on or near the furnace. In the most basic system this functionality is provided by use of a fan center relay and the low voltage wiring to the thermostat now will require a minimum of three wires for heat only units and four wires for heat cool fan for control. This additional terminal is labeled g in the thermostat. Low voltage thermostats include digitalprogrammable mercury bimetallic and mechanical contact types. Remove de jumper to enable dehum input on furnace control board. How to wire an air conditioner for control 5 wires the diagram below includes the typical control wiring for a conventional central air conditioning systemit includes a thermostat a condenser and an air handler with a heat source. Low voltage wiring diagrams thermidistat control cancels.
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