INTERFACE ADAPTER
GAS FURNACE
(SINGLE-STAGE)
AC
SUPPLY
POWER
L2
L1
24V AC
1 2 R C G
W1 W2
YLO
Y
C
G
R
Y
W
BL
GR
RD
BR
WH
YL
PU
(Cool-Hi speed)**
(Cool-Lo speed)**
(Heat-Hi speed)**
Heat-Hi Cool-Hi
EXTERNAL
RELAY***
** Select any blower speed based on field requirement
Multi
-speed Blower
PCB TERMINAL
*(Note)
* Connect the adapter “YLO” to the furnace “Y”
(Thermostat and A
-
coil wiring omitted)
24VAC
SPDT
***User-supplied
Please install relay according to UL electrical codes.
For this connection, set DIP switch DS2 to
“TWO-STAGE GAS FURNACE” setting
1
2
3
4
TWO-STAGE
GAS FURNACE
DS2
WIRING DIAGRAM FOR THE SINGLE-STAGE FURNACE APPLICATION OF ADDING A RELAY
INTERFACE ADAPTER
GAS FURNACE
(SINGLE-/TWO-STAGE)
AC
SUPPLY
POWER
L2
L1
24V AC
R C
C
R
X1A
WIRE NUT
(TO FLOAT SWITCH)
WIRING DIAGRAM FOR
FLOAT SWITCH
Please connect the normally closed float switch to “R” channel
for field installation.
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English
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