Fig. 11—Furnace Wiring Diagram
A99404
PCB
PL7
3
2
1
6
5
4
987
G
R
Y
W
C
HUM
EAC-2
TRAN
FSE
NOTE #5
GV
NOTE #11
LS
PRS
(WHEN USED)
LGPS
GRN
JB
LEGEND
BLWR BLOWER MOTOR RELAY, SPST-(N.O.)
BLWM BLOWER MOTOR
CAP CAPACITOR
CPU MICROPROCESSOR AND CIRCUITRY
EAC-1 ELECTRONIC AIR CLEANER CONNECTION (115 VAC 1.5 AMP MAX.)
EAC-2 ELECTRONIC AIR CLEANER CONNECTION (COMMON)
FL FUSE LINK
FRS FLAME ROLLOUT SW. -MANUAL RESET, SPST-(N.C.)
FSE FLAME PROVING ELECTRODE
FU1 FUSE, 3 AMP, AUTOMOTIVE BLADE TYPE, FACTORY INSTALLED
FU2 FUSE OR CIRCUIT BREAKER CURRENT INTERRUPT DEVICE
(FIELD INSTALLED & SUPPLIED)
GND EQUIPMENT GROUND
GV GAS VALVE-REDUNDANT OPERATORS
GVR GAS VALVE RELAY, DPST-(N.O.)
HI/LO BLOWER MOTOR SPEED CHANGE RELAY, SPDT
HSI HOT SURFACE IGNITOR (115 VAC)
HSIR HOT SURFACE IGNITOR RELAY, SPST-(N.O.)
HUM 24VAC HUMIDIFIER CONNECTION (.5 AMP. MAX.)
IDM INDUCED DRAFT MOTOR
IDR INDUCED DRAFT RELAY, SPST-(N.O.)
ILK BLOWER ACCESS PANEL INTERLOCK SWITCH, SPST-(N.O.)
JB JUNCTION BOX
LED LIGHT-EMITTING DIODE FOR STATUS CODES
LGPS LOW GAS PRESSURE SWITCH, SPST-(N.O.)
LS LIMIT SWITCH, AUTO RESET, SPST(N.C.)
OL AUTO-RESET INTERNAL MOTOR OVERLOAD TEMP. SW.
PCB PRINTED CIRCUIT BOARD
PL1 10-CIRCUIT PCB CONNECTOR
PL2 2-CIRCUIT PCB CONNECTOR
PL3 3-CIRCUIT ADAPTER CONNECTOR
PL5 2-CIRCUIT ADAPTER CONNECTOR
PL6 2-CIRCUIT HSI, PCB CONNECTOR
PL7 9-CIRCUIT ADAPTER CONNECTOR
PRS PRESSURE SWITCH, SPST-(N.O.)
TEST/TWIN COMPONENT TEST & TWIN TERMINAL
TRAN TRANSFORMER-115VAC/24VAC
JUNCTION
UNMARKED TERMINAL
PCB TERMINAL
FACTORY WIRING (115VAC)
FACTORY WIRING (24VAC)
FIELD WIRING (115VAC)
FIELD WIRING (24VAC)
CONDUCTOR ON PCB
FIELD WIRING TERMINAL
FIELD EARTH GROUND
EQUIPMENT GROUND
FIELD SPLICE
PLUG RECEPTACLE
L1
L1
BLWR
HI/LO
TO 115VAC FIELD DISCONNECT
NOTE #4
EQUIPMENT GROUND
SPARE-1
HEAT
SPARE-2
COOL
NOTE #7
EAC-1
START
OL
HI
MED HI
MED LO
LO
BLWM
SCHEMATIC DIAGRAM
(NATURAL GAS & PROPANE)
1
HSI
2
PL6
3
PL3
115VAC
PR1
TRAN
24VAC
1
2
TEST/TWIN
FU1
NOTE #6
CAP-1
L2
FRS1
FRS2
LGPS
PL7
PRS
FSE
9
1
5
CPU
HSIR
IDR
BLWR
Y
G
C
R
W
SEC-1
HI/LO
GVR
GVR-1
OM
OM
10
4
6
2
HUM
NEUTRAL
L2
ILK
FU2
L1
ILK
GND
GND
RED
BLU
ORN
WHT
WHT
WHT
RED
ORN
WHT
GRN
RED
WHT
RED
GRN
YEL
BLU
BLU
RED
WHT
BLK
TEST/TWIN
24V
FU1
LED 1
12345678910
1
2
3
4
5
J1
BLOWER OFF DELAY
JUMPER SELECT
YEL
BLK
WHT
WHT
GRN
IDM
2
1
HSI
WHT
BLK
BLK
WHT
WHT (COM)
BLK
GRN
BLK
WHT
WHT
2
1
PL2
WHT
BLK
BLK
L1
COOL
SEC-2
SEC-1
EAC-2
SEC-2
NOTE #5
GV
8
9
6
5
2
3
7
4
8
1
7
3
225
180
135
90
PL1
2
1
PL5
PL6
3
2
1
PL3
L2
HEAT
1
2
PL5
COM
IDM
DSS
BVSS
ALS
FL
LS
(WHEN USED)
NOT USED
NOT USED
NOTE #12
(WHEN USED)
NOTE #10
NOTE #11
NOTE #11
(WHEN USED)
(WHEN USED)
NOTE #10
FRS1
FRS2
FL
(WHEN USED)
NOTE #10
BVSSDSS
(WHEN USED)
NOTE #12
ORN ORN
ALS
(WHEN USED)
NOTE #10
ORN
ORN
NOTE #12
11
WHT
NOT USED
PL1
11
HSIR
1
2
PL2
IDR
FUSED OR CIRCUIT BREAKER
DISCONNECT SWITCH (WHEN REQ'D)
NOTE #4
J2
NOTES:
1. If any of the original equipment wire is replaced use wire rated for 105°C.
2. Inducer (IDM) and blower (BLWM) motors contain internal auto-reset thermal overload
switches (OL).
3. Blower motor speed selections are for average conditions, see installation instructions for
details on
optimum speed selection.
4. Use only copper wire between the disconnect switch and the furnace junction box (JB).
5. This wire must be connected to furnace sheet metal for control to detect flame.
6. Replace only with a 3 amp fuse.
7. Blower-on delay, gas heating 45 seconds, cooling or heat pump 2 seconds.
8. Blower-off delay, gas heating 90, 135, 180 or 225 seconds, cooling or heat pump 90 seconds.
9. Ignition-lockout will occur after four consecutive unsuccessful trials-for-ignition. Control will
auto-reset after three hours.
10. When used, auxiliary limit switch (ALS) is on some downflow models only. When used, FL is on
upflow models only. FRS1 and FRS2 only used downflow and horizontal models.
11. Factory connected when LGPS is not used.
12. Factory connected when BVSS is not used. BVSS used when Chimney Adapter Accessory Kit
is installed.
325770-101 REV. B
OL
START
BLWM
CAP -1
SPARE 1 SPARE 2
EAC-1
PR1
GRN
BRN
BRN
RED (LO)
WHT
(COM)
YEL
BLU
(MED LO)
BLK (HI)
(MED HI)
11
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