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Thermostat Wiring Guide
1. These diagrams are for reference. See thermostat
wiring instructions for specific terminal
assignments, connections or operation.
2. Humidifier/humidistat is optional and not included
with the furnace.
3. Dehumidify feature requi res thermostat with
DEHUM feature or a separate dehumidistat to get
the dehumidification operation. Dehumidistat is
optional and not included with the furnace.
4. Underlined terminal indicates intended use for
multiple function terminals.
5. TSIB terminals only available on 58HDV/359BAV
models.
6. Two--stage Air Conditioning or two--stage Heat
Pump compatible.
7. W2 furnace operation is from furnace control
algorithm SW1 DIP switch #3 (TT) set to OFF.
Furnace runs in Low Heat for 12 minutes then
switches to High Heat if heating call still exists.
8. 24V HUM terminal on furnace control is used to
power a humidifier (on call for heat and pressure
switch closed) if no HUM thermostat option is
available.
9. DEHUM provides a 20% reduction in airflow (when
Y1 or Y1 + Y2 is energized) when the furnace
control DEHUM terminal is energized with 24V.
10. If no DEHUM thermostat option is available, a
dehumidistat that has closed contacts on a call for
dehumidify may be used
11. O provides a 10% reduction in airflow when Y1 or
Y1 + Y2 is energized and O is NOT energized. (J2
jumper on TSIB must be in HP COMFORT position
to get this function. AC/HP EFFICIENCY position
results in no reduction of airflow for Y1 or Y1 + Y2
calls regardless of O being energized or not.)
12. For Heat Pump/Furnace systems, refer to Fossil Fuel
Kit or Dual Fuel Thermostat Installation Instruc tions
for wiring.
NOTE 3, 9, 10
Y
W
G
R
W1
Y/Y2
G
R
C COM
TWO-STAGE or VS
FURNACE
CONTROL
SINGLE-STAGE
AIR CONDITIONER
Y
C
SINGLE-STAGE
THERMOSTAT
W2
24V in
COM
OPTIONAL
HUMIDIFIER
DEHUM
HUM
24V HUM
DEHUM
NO CONNECTION
NO CONNECTION
NOTE 2
NOTE 11
NOTE 7
Y1
O
TSIB
NOTE 5
A07787
Fig. 56 -- HUM and DEHUM Terminal available from Thermostat. Humidifier Wiring Models and Dehumidify Wiring
58HDV