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Fig. 16—Furnace Wiring Diagram
A00304
PCB
BLOWER OFF DELAY
SELECTION CHART
90 SEC
135 SEC
180 SEC
225 SEC
GVR
HI/LO
RELAY
SEC-1
SEC-2
PL1
3 2 1
6 5 4
9 8 7
LED
TEST/TWIN
BLOWER
OFF
DELAY
G
R
Y
W
C
HUM
HSIR
IDR
BLWR
BLOWER
SPEED
SELECT
FU1
COOL
HEAT
L2
PL3
PL2
VAC
120
L1
PR1
1
2
1
2
3
PR2
24 VAC-3A
FUSE
SPARE-2
SPARE-1
EAC-1
EAC-2
C
1.
5
A
M
P
1
2
PL5
WHT
BLK
WHT
WHT
BL
K
BL
K
HSI
BLK
WHT
WHT (COM)
RED (LO)
BLU (MED LO)
NOTE #7
OL
START
BLWM
YEL (MED HI)
BLK (HI)
BRN
BRN
TR
A
N
BLU
RED
BLK
WHT
WHT (COM)
CAP
RED
RED
ORN
FUSED DISCONNECT
SWITCH (WHEN REQ’D)
NOTE #4
FU2
BLK
WHT
JB
LEGEND
ALS
AUXILIARY LIMIT SWITCH, OVERTEMP. -MANUAL RESET, SPST-(N.C.)
BLWR
BLOWER MOTOR RELAY, SPST-(N.O.)
BLWM BLOWER MOTOR
BVSS
BLOCKED VENT SHUTOFF SWITCH, SPST - (N.C.)
CAP
CAPACITOR
CPU
MICROPROCESSOR AND CIRCUITRY
DSS
DRAFT SAFEGUARD SWITCH
EAC-1
ELECTRONIC AIR CLEANER CONNECTION (115 VAC 1.5 AMP MAX.)
EAC-2
ELECTRONIC AIR CLEANER CONNECTION (COMMON)
FL
FUSIBLE 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)
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
9-CIRCUIT CONNECTOR
PL2
2-CIRCUIT PCB CONNECTOR
PL3
3-CIRCUIT IDM CONNECTOR
PL5
2-CIRCUIT HSI/PCB 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 GROUND
EQUIPMENT GROUND
FIELD SPLICE
PLUG RECEPTACLE
L1
L2
L1
BLWR
HI/LO
TO 115VAC FIELD DISCONNECT
NOTE #4
EQUIPMENT GROUND
SPARE-2
HEAT
SPARE-1
COOL
NOTE #7
COM
HSIR
EAC-1
START
OL
COM
HI
MED HI
MED LO
LO
BLWM
SCHEMATIC DIAGRAM
(NATURAL GAS & PROPANE)
EAC-2
1
1
HSI
2
PL5
2
PL2
3 PL3
PR2
115VAC
PR1
TRAN
24VAC
1
2
IDR
TEST/TWIN
FU1
NOTE #6
CAP
L2
PL1
8
FSE
9
6
5
CPU
HSIR
IDR
BLWR
Y
G
C
R
W
GVR-2
SEC-1
HI/LO
GVR
SEC-2
NOTES:
322869-101 REV. H
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 sheetmetal for control to detect flame.
6. Replace only with a 3 amp fuse.
7. Yellow lead not on all motors.
8. Blower-on delay, gas heating 45 seconds, cooling or heat pump 2 seconds.
9. Blower-off delay, gas heating 90, 135, 180 or 225 seconds, cooling or heat pump 90 seconds.
(135 seconds only on some models)
10. Ignition-lockout will occur after four consecutive unsuccessful trials-for-ignition. Control will auto-reset
after three hours.
11. When used, auxiliary limit switch (ALS) is on some downflow models only. When used, FL is on
upflow models only.
12. Some models may have spade quick connect terminals.
13. Factory connected when LGPS is not used.
14. Factory connected when BVSS is not used. BVSS used when Chimney Adapter Accessory Kit is
installed.
15. Gas valve leads are interchangeable on single stage valves.
BL
K
OM
SW2
SW1
OM
3
4
7
1
OM
HUM
IDM
ILK
DSS
BVSS
PRS
ILK
L1
NEUTRAL
IDM
(WHEN USED)
NOTE #14
NOT USED
NOT USED
NOT USED
FSE
BLU
PRS
DSS
BVSS
(WHEN USED)
NOTE #14
WHT
LS
FL
(NOT ON ALL MODELS)
NOTE #9
FRS1
FRS2
LS
FL
NOTE #12
ORN
ORN
ORN
ALS
(WHEN USED)
ORN
NOTE #11
LGPS
(WHEN USED)
NOTE #13
NOTE #14
NOTE #11
2
GVR-1
NOTE #14
ALS
(WHEN USED)
(WHEN USED)
NOTE #13
LGPS
(WHEN USED)
NOTE #13
YEL
FRS1
FRS2
(WHEN USED) NOTE #11
GRN/YEL
GRN/YEL
GND
NOTE #5
GRN/YEL
NOTE #5
GRN/YEL
NOTE #15
NOTE #15
GV
GV
14
