Lennox Commercial Touchscreen Thermostat - Wire TG;TC;TH 090−300 S Units; Power the Thermostat; Installing Batteries; Wiring 24 Vac Common

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505103M 11/08
UNIT TB1
A2
THERMOSTAT
Figure 8. Wire TG/TC/TH 090−300S Units
UNIT TB1A2
THERMOSTAT
Figure 9. Wire TG/TC/TH 036−060 Units
UNIT TB1A2 THERMOSTAT
Figure 10. Wire CB/CBH17 Used with HS29
and HP29 Units
SUBBASE
SUBBASE
SUBBASE
20K Ohm
10K Ohm
SUBBASE
All combinations of sensors shown here have an
equivalent resistance of 20K ohms. Select option 4
on installer setup number 0340.
SUBBASE
20K Ohm
20K Ohm 20K Ohm
20K Ohm 20K Ohm
10K Ohm10K Ohm20K Ohm
20K Ohm
10K Ohm
20K Ohm
20K Ohm 10K Ohm
Figure 11. Sensor Wiring for Temperature Av-
eraging
Power The Thermostat
You can choose from three methods to power the
thermostat:
S Batteries only (AAA alkaline).
S 24 Vac direct connection only.
S 24 Vac direct connection with battery backup
(AAA alkaline).
Wiring 24 Vac Common
S Single−Transformer System−Connect the
common side of the transformer to the C
screw terminal of the thermostat wallplate.
Leave the metal jumper wire in place between
Rc and R.
S Two−Transformer System−Connect the com-
mon side of the cooling transformer to the C
screw terminal of the thermostat wallplate.
Remove the metal jumper wire between Rc
and R.
Installing Batteries
1. Install three AAA alkaline batteries on the
back of the thermostat as marked (see figure
12).