7
69-1631—1
Heating System Table
Step 5. Wire Thermostat Terminals
Type of System
DIP Switches
1 and 2
Fuel Switch
Warm air, gas, or oil heating system with an efficiency rating under 90%.
(The furnace efficiency rating should be on the furnace.)
Use factory setting
1–On; 2–On
F
High-efficiency furnace such as a 90% or greater AFUE (Average Fuel
Utilization Efficiency) unit
1–Off; 2–On
F
Hot water boiler
1–Off; 2–On
F
Electric furnace
1–On; 2–Off
E
Fig. 9.
a. Hold thermostat as shown in Fig. 9.
b. Using the labels on the wires, match letter of your old ther-
mostat wire with the corresponding terminal on the back of
your new thermostat.
NOTE:
If letters on old thermostat terminals do not match letters on
new thermostat terminals, all old wires may not need con-
necting to new thermostat. See Special Wiring Instructions
section.
Fig. 10.
c. Loosen terminal screws and slip each wire beneath its
matching terminal (Fig 10).
d. Securely tighten terminals.
W
Y
G
R
M20125
INSERT
STRAIGHT
UNDER
SCREW HEAD
5/16 in.
(8 mm)
STRIP
END OF WIRE
VISIBLE HERE
M20126