MCAC-RTT6S-201701 Midea R410A Tropical ClimaCreator Series Rooftop Package 220V 3Ph 60Hz
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3.4 Wiring of the wired controller
Each wire coming from the wall to the existing controller is connected to a terminal point on that
controller. Each of these terminal points is usually marked with a code latter as shown in
following figures.
Note that this controller has multiple function terminals that allow single-stage heat pump
capability. Standard systems use: Rh, Rc, G, Y, W. [Single-Stage Heat Pumps use: R, Y, G, and
O or B.] Following table will show the multiple functions of the terminals. Use the terminals that
match your system.
The number of wires in your system can be as few as two (for heat only systems), as many as
eight, or any number in between. If you follow the labeling procedures correctly, you do not have
to be concerned about how many wires there are.
There is often no terminal marking on the existing thermostat of two wires, heat only systems.
Just connect either of the wires to the RH terminal, and then connect the other wire to the W
terminal to complete the circuit.
Important things: Before connecting any wires, apply the self-adhesive labels provided to the
wire as shown in the following figures. (For example, attach the label marked W to the wire.)
Ignore the color of the wires since these do not always comply with the standard.
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