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Determine if your B wire is a common or O/B wire
Most thermostat manufacturers use C to designate the connector for
the common wire. However there are some Trane, American
Standard, and York thermostats that use B for the common wire. To
address this, check:
1. If you’re installing a Wyze Thermostat to control a heat pump
system and the current thermostat has both a B and a C,
connect the B to the Wyze O/B terminal and connect the C to
the Wyze C terminal.
2. If you’re installing a Wyze Thermostat to control a heat pump
system and the current thermostat has both an O and a B,
connect the O to the Wyze O/B terminal and connect the B to
Wyze C terminal.
3. If you’re installing a Wyze Thermostat to control a heat pump
system and the current thermostat only has a B wire, connect
the B to the Wyze O/B terminal and install a CWA.
4. If you’re installing a Wyze Thermostat to control a conventional
system (non heat pump) and you see a B wire connected to
the current thermostat, that B is a common wire and should be
connected to the C terminal on Wyze Thermostat.
Important: If you have a B wire that is actually a common wire, not
following the rules above can lead to blowing a fuse on your HVAC
controller board and, most likely, damaging your WyzeThermostat.
When X, W1 or W2 is an AUX wire
In a heat pump system, W1, W2, X, X1 or X2 are used to turn on
auxiliary heat and one of them should be attached to the W1 or W2
terminal in your Wyze Thermostat. You should, however, verify that
the X wire on the old thermostat is not a common wire. Once you’re
sure, you can assume that the X is the auxiliary heat and should be
inserted into the W1 or W2 terminal on Wyze Thermostat depending
on the available terminal after connecting the other wires.
1. If you’re installing a Wyze Thermostat to control a heat pump
system and the current thermostat has both an X and a C,
connect the X to the Wyze W1 or W2 terminal and connect the
C to the Wyze C terminal.
2. If you’re installing a Wyze Thermostat to control a heat pump
system and the current thermostat has an X and both O and
B (where B is C), connect the X to the Wyze W1 or W2
terminal and connect the B to the Wyze C terminal.
3. If you’re installing a Wyze Thermostat to control a heat pump
system and you see an X wire connected to the current
thermostat without a C-wire, that X is a common wire and
should be connected to the C terminal on Wyze Thermostat.
Changing from an ecobee PEK
If you have an ecobee PEK, follow this guide to change the PEK to
the Wyze CWA.
Note: The ecobee PEK and Wyze CWA are not the same, and Wyze
Thermostat is not compatible with the PEK without some
configuration.
Control Board:
At the control board, we will need to switch out the PEK for the CWA.
Wyze Thermostat CWA and ecobee PEK wiring line up directly the
same at the control board. So it is very simple to change the wiring
from the PEK to the CWA.
1. Ensure the HVAC system is power is shut off from the circuit
breaker
2. If the labels on the PEK thermostat side (4 wires) labels are
missing, please label them with the stickers provided in the
box for your Wyze Thermostat.
3. Remove one wire at a time from the PEK and directly wire it to
the CWA.
● Y -> Y
● G -> G
● R -> R
● W -> W
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