Amana TSTATA4271GT Owner's Manual page 59

Installation Instructions
Sample Wiring Diagrams
Heat Pump Systems with Dual Fuel
7 Wire, 2 Stage Cooling, 3 Stage Heat
Residential & Commercial Heat Pump with
'O' Reversing Valve and Fossil Fuel furnace.
R 24VAC Power
C 24VAC Common
W1/O/B Reversing Valve
W2 3rd Stage Heat
(connected to furnace)
Y1 1st Stage Compressor
(Cool or Heat)
Y2 2nd Stage Compressor
(Cool or Heat)
G Fan
Free Cooling
Free Cooling
Damper
10K Thermistor
Outdoor Sensor
TSTATGTAC-OS
Free Cooling utilizes the Y1 terminal for the operation of 1st stage cooling.
If mechanical (compressor) cooling is also present, the mechanical cooling is
connected to the Y2 terminal in this instance.
Free Cooling may be used with a Gas/Electric or Heat Pump system.
Temperature Sensor: TSTATGTAC-OS Temperature Sensor 10K ohm sensor
at 77F/25C. Negative Temperature Coefficient.
with Dip Switch Positions
GAS/EL
O
GAS
Number of Compressor Stages
set to 2
(see Compressor Stages, pg. 35)
Dual Fuel set to On
(see Dual Fuel Settings, pg. 38)
Use 18-22 gauge thermostat wire.
52
HP
B
ELEC
SENSOR