Fast TS21 Instruction Manual - page 3
WIRING TABLE
CONFIGURATION Y1
Y2
W2
OB/W
R/C
R/H
G
Cooling Only
Air Conditioner
Furn. Off
AC
x
x
x
2 Air Conditioner
Furn. Off
AC1
AC2
x
x
x
Heating Only
No Compressor
Electrical Furn.
El.Furn
El.Furn2*
x
x
x
No Compressor
Emg. El. Furn.
Emg. El. Furn.
El.Furn
El.Furn2*
x
x
x
No Compressor
Gas
Gas
Gas2*
x
x
x
No Compressor
Oil
Oil
Oil2*
x
x
x
No Compressor
2 Stage Gas
Gas1
Gas2
x
x
x
* if there is another furnace, then connect it to OB/W relay.
1 Stage Cooling, 1 Stage Heating
Heat Pump
Furn. Off
HP
OB
x
x
x
Air Conditioner
Electrical Furn.
AC
El.Furn
x
x
x
Air Conditioner
Emg. El. Furn.
AC
Emg. El. Furn.
El.Furn
x
x
x
Air Conditioner
Gas
AC
Gas
x
x
x
Air Conditioner
Oil
AC
Oil
x
x
x
MOUNTING THE THERMOSTAT TO THE WALL
1.
Make sure to turn off the power supply located at the electrical service panel. All heating and
cooling units should be OFF.
2.
Remove the cover plate by pulling up the cover from the left or right side only.
3.
Align the thermostat unit to the wall.
4.
Mark the two locations for drilling the 3/16” holes required for the plastic screw anchors.
5.
Remove the thermostat and drill the two 3/16” holes in these locations.
6.
Insert the plastic gyproc screw anchors and tighten them securely.
7.
Make the appropriate wire connections based on the specifications of the household HVAC unit(s).
Please refer to Wiring Diagram to determine the appropriate wire connections.
8.
Securely mount the thermostat unit to the wall with the two supplied screws.
9.
Fit the cover plate back by clipping one side first (left or right) and than push down on the
opposite side.
10. Turn on the electricity at the electrical service panel.