105
Communicating Furnace
INTE
GRATE
D FURNACE
CONTROL
THERMOSTAT WIRING DIAGRAMS-HEAT PUMP
19. 24VAC AND COMMON CONNECTIONS (E10/E11)
For connection to the low voltage side of the control
transformer. Terminals are ¼” quick-connect style.
20. FUSE (P100/P101)
A fuse is provided to protect low-voltage (24VAC) cir-
cuits from shorts between 24VAC and Ground or
Common. A fault code 30 is displayed at the furnace
control when the fuse has been opened.
D
TWO-STAGE
THERMOSTAT
(
NON-COMMUNICATING)
TWO-STAGE
GAS
F
URNACE
C
ONTROL
OUTDOOR
UNIT
FIGURE 59
W
IRING DIAGRAM FOR A LEGACY TWO-STAGE THERMOSTAT
ST-A1194-93-00
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