Multistat Smart Thermostat Deployment Guide (CLI-W210x/W200x) 12 of 21 45 Perseverance Way, Hyannis MA 02601
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Wire Designation Descriptions
There is no direct standard when designating wires for thermostats. A description of each of the designators stamped on the thermostat's mounting plate
is shown below.
Designators - Power
RH/RC
– With one power source in the system, the hot wire from the transformer is wired to RC. See the Connect Power - One Transformer used
to power the HVAC system section in the Multistat Smart Thermostat Quick Start Guide that is available on the Savant Community.
– When there are separate heating and cooling HVAC systems with a separate power source for each,
– Connect the hot wire of the transformer from the heating system to RH.
– Connect the hot wire from the cooling system to RC.
– Remove the jumper shunt from JP1 on the circuit board. Failing to remove the shunt will result in damaging the board. See the
Connect Power - Two Transformers used to power the HVAC system section in the Multistat Smart Thermostat Quick Start Guide
available on the Savant Community.
24C
– With just one power source in the system, the common wire from the transformer is wired to the 24C terminal.
– When there are separate heating and cooling HVAC systems, connect the common wire from the transformer in the cooling system to
24C.
Designators - Signaling
O In a heat pump system, connect to the changeover/reversing valve connection (O).
G In a standard HVAC system, connect to the fan terminal.
Y2
In a standard HVAC system, connect to the 2nd stage cooling terminal.
In a heat pump type system, connect to the 2nd stage cooling terminal on the compressor.
Y1
In a standard HVAC system, connect to the 1st stage cooling terminal.
In a heat pump type system, connect to the terminal on the compressor.
W2 In a standard HVAC system, connect to the 2nd stage heating terminal.
W1
In a standard HVAC system, connect to the 1st stage heating terminal.
In a heat pump system, connect to terminal on the heating strip.
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