Step 7 Adjust Fan Operation Switch, As Required - Honeywell CT3400 Instructions Manual

IMPORTANT: When using a high efficiency
furnace such as a 90% or greater AFUE
(Average Fuel Utilization Efficiency) unit,
leave screw 1A in and screw 1B out one turn.
The thermostat is set to display the time as
a 12-hour clock and the temperature in degrees
Fahrenheit. If a 24-hour clock (e.g., military
time) or degrees Celsius readings are desired,
adjust screws 2A and 2B as necessary using
the illustration as a guide.
For an explanation of the Recovery Selec-
tion screws (3A), see pages 7 and 8.
STEP 7 Adjust Fan Operation Switch, As Required
The thermostat fan operation switch is fac-
tory-set in the left (NON ELEC) position. This is
the correct setting for most systems. If your
system is an electric furnace, set the switch to
the right (ELEC) position. The ELEC position
allows the fan to turn on immediately with the
heating or cooling system if the G terminal is
connected to a fan relay.
NOTE: Either the switch must be set before the
batteries are installed, or the left battery
must be removed to access the switch.
BACK OF THERMOSTAT
SYSTEM 1A
GRAVITY OUT
AIR/WATER 1 TURN
HOT
WATER
OR HIGH
IN
EFFICIENCY
(90%+AFUE)
IN
GAS/OIL
WARM AIR (FACTORY SETTING)
OUT
ELECTRIC
1 TURN
WARM AIR
19
BACK OF THERMOSTAT
4A
FAN OPERATION SWITCH
(SHOWN IN NON ELEC POSITION)
20
RECOVERY
3A
SELECTION
IN
ADAPTIVE
TM (FACTORY SETTING)
INTELLIGENT
OUT
CONVENTIONAL
1 TURN
3A 1A 1B
2A 2B
1B DISPLAY 2A 2B
OUT
OUT OUT
12 hr./ °F
1 TURN
(FACTORY SETTING)
24 hr./ °F OUT
IN
OUT
1 TURN
24 hr./ °C
IN IN
IN
12 hr./ °C OUT IN
IN
M 618A
69-0733—3
69-0733—3
INSTALLATION
M619C