Honeywell CT3400 Programming And Installation Instructions page 22

IMPORTANT: When using a high efficiency
furnace such as a 90% or greater AFUE
(Average Fuel Utilization Efficiency) unit, ad-
just 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 figure as a guide.
■
For an explanation of the Recovery Selection
screws (3A), see pages 7 and 8.
BACK OF THERMOSTAT
1A
SYSTEM
GRAVITY OUT
1 TURN
AIR/WATER
HOT
WATER
OR HIGH IN
EFFICIENCY
(90%+AFUE)
IN
GAS/OIL
(FACTORY SETTING)
WARM AIR
OUT
ELECTRIC
1 TURN
WARM AIR
19
RECOVERY
3A
SELECTION
IN
ADAPTIVE
TM (FACTORY SETTING)
INTELLIGENT
OUT
CONVENTIONAL
1 TURN
3A 1A 1B
2A 2B
1B 2A 2B
DISPLAY
OUT
OUT OUT
12 hr./ °F
1 TURN
(FACTORY SETTING)
OUT
24 hr./ °F IN
OUT
1 TURN
24 hr./ °C
IN IN
IN
12 hr./ °C IN
OUT
IN
M 618A
69-0733B—1