Honeywell Heat/1Cool - T841A1563 Premier 2 Stage Thermostat User Manual page 10

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE
Fig. 2. Installing an R8222B Switching Relay on heat pumps requiring heating mode changeover.
Heat Pumps with Cooling Mode Changeover
Here is how the switching relay allows the system to work properly:
* The Y terminal is connected to the equipment terminal Y1 through the normally closed contacts on the R8222B
Switching Relay. When the thermostat calls for cooling, the thermostat Y terminal activates the first stage of cooling.
* The B terminal is connected to the coil terminals of the R8222B Switching Relay. When the system switch is in the
HEAT position, the B terminal is energized, reversing the logic of the Chronotherm® III T8611G and T8611M Y
terminal. Now when the thermostat calls for heating, the Y terminal activates the first stage of heating.
Fig. 3. Installing an R8222B Switching Relay on heat pumps requiring cooling mode changeover.
70-6627 • 8
Equipment
Equipment Function
Terminals
R
Power
Y1
1st Stage Cool
Y2
2nd Stage Cool
G
Fan
1st Stage Heat W1
2nd Stage Heat W2
Transformer Common C
B
Heating Changeover
Equipment
Equipment Function
Terminals
Power
1st Stage Cool
2nd Stage Cool
Fan
1st Stage Heat
2nd Stage Heat
Transformer Common
Cooling Changeover
T8611M
Terminals
R
Y2
G
W2
C
Y
O
R8222B Relay
B
T8611M
Terminals
R
Y1
Y2
G
W1
W2
C
R8222B Relay
O
M13231
R
Y2
G
W2
C
Y
B
O
M13230