→Fig. 11—Unit Wiring Diagram A95335

PCB
BLOWER OFF DELAY
SELECTION CHART

90 SEC

135 SEC

180 SEC

225 SEC

GVR

HI/LO

RELAY

SEC-1 SEC-2
PL1 321
654
987
LED
TEST/TWIN
BLOWER
OFF
DELAY
G
R
Y
W
C
HUM

HSIR IDR BLW R

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 AMP
12
PL5
WHT
BLK
WHT
WHT
BLK
BLK
HSI
BLK
WHT
WHT (COM)
RED (LO)
BLU (MED LO)
NOTE #8
OL
START
BLWM
YEL (MED HI)
BLK (HI)
BRN
BRN
TRAN
BLU
RED
BLK
WHT
WHT (COM)
GRN
CAP
RED
NOTE #5
RED
ORN
FUSED DISCONNECT
SWITCH (WHEN REQ’D)
NOTE #4
FU2
BLK
WHT
GRN
GRN
JB

LEGEND

ALS AUXILIARY LIMIT SWITCH, OVERTEMP. -MANUAL RESET, SPST-(N.C.)
BLWR BLOWER MOTOR RELAY, SPST-(N.O.)
BLWM BLOWER MOTOR
CAP CAPACITOR
CPU MICROPROCESSOR AND CIRCUITRY
DSS DRAFT SAFEGUARD SWITCH
EAC-1 EL ECT RONIC AIR CLEANER CONNECTION (115 VAC 1.5 AMP MAX.)
EAC-2 EL ECTRONIC AIR CLEANER CONNECTION (COMMON)
FL FUSIBLE LINK
FRS FLAME ROLLOUT SW. -M ANUAL 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-REDUND ANT 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 NEUTRAL
L1 BLWR
HI/LO
TO 115VAC FIELD DISCONNECT
NOTE #4
EQUIPMENT GROUND
SPARE-2
HEAT
SPARE-1
COOL NOTE #8
COM
HSIR
EAC-1
START
OL
COM
HI
MED HI
MED LO
LO
BLWM

SCHEMATIC DIAGRAM

(NATURAL GAS & PROPANE)

EAC-2
11HSI
2
PL52
PL2
3
PL3
PR2
115VAC
PR1
TRAN 24VAC
1
2
IDR
TEST/TWIN
FU1 NOTE #6
CAP
L2
PL1
GV
2-C
1-M
3-P
NOTE #5
8
FSE
9
6
5
CPU
HSIR IDRBLWR
Y
G
C
R
W
GVR-2
SEC-1
HI/LO GVR
GVR-1
SEC-2

NOTES:

322869-101 REV. C

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 downflow models only. When used FL is on upflow
models only.
12. Some models may have spade quick connect terminals.
BLK
OM
SW2
SW1
OM
2
3
4
7
1
OM
HUM
IDM
ILK
DSS ALS
PRS
ILK
L1
NEUTRAL
IDM
(WHEN USED)
NOTE #11
NOT USED
NOT USED
NOT USED
GRN 2-C
FSE
1-M 3-P
GV
BLU
YEL
PRS
DSS
ALS
(WHEN USED)
NOTE #12
WHT
FRS1 FRS2
LS FL
(WHEN USED)
(NOT ON ALL MODELS)
NOTE #9
FRS1 FRS2
LS FL
(WHEN USED
NOTE #12
—10—