Honeywell CT3300 warranty Set the thermostat for your type of heating system, Fuel Switch

Step 4. Set the thermostat for your type of heating system

Fig. 8

	THERMOSTAT BACK
HEATING	SELECTING ºF OR ºC
SYSTEM TYPE

IMPORTANT: Setting your thermostat correctly for your type of heating system allows it to maintain accurate temperature control, minimize swings in the temperature of the room, and efficiently run the fan.

AC

DISPLAY F C–IN

DISPLAY C C–OUT 1 TURN

B D

FOR HIGH EFFICIENCY FURNACE (90%+ AFUE)

ADJUST: SCREW A–OUT ONE TURN

SCREW B–IN

FUEL SWITCH – F POSITION

FUEL SWITCH

FE

FUEL SWITCH

ADJUST SCREWS THROUGH HOLES TO SELECT OPERATION DESIRED

HEATING SYSTEM			FUEL SWITCH
			POSITION
WARM AIR	A–IN	B–IN	F
FURNACE
HOT WATER A–OUT		B–IN	F
BOILER	1 TURN
ELECTRIC	A–IN	B–OUT	E
FURNACE		1 TURN
W	Y	G
R			Rc

M20145

a.Use the FUEL SWITCH on the back of the thermostat to set your new thermostat for the type of fuel that your heating system uses: F–gas or oil, or E–electricity.

Note: This setting enables proper fan operation.

b.Use the A and B screws on the back of the thermostat to set your new thermostat for your type of heating system. See the heating system table on the next page to find the correct settings.

Note: These screws are factory-set for a warm air, gas, or oil heating system.

c.The thermostat is set to display the temperature in degrees Fahrenheit (°F). If you want to display the temperature in degrees Celsius (°C), adjust screw C out one turn.

d.You can install the batteries and program your thermostat now, or you can wait until the thermostat is mounted on the wall. To install the batteries, see the instructions on page 8. To program the thermostat, see the instructions that begin on page 12.

6 INSTALLATION 69-0654-5