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PCB
BLOWER OFF DELAY
SELECTION CHART
90 SEC
135 SEC
180 SEC
225 SEC
GVR
HI/LO
RELAY
SEC-1
SEC-2
WHT
PL1
321
6
5
4
9
87
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 AMP
12
PL5
WHT
BRN
GRN
BLK
IDM
BRN
CAP -2
WHT
WHT
BLK
BLK
HSI
AUX
OL
M
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 -1
GRN
2-C
RED
FSE
NOTE #5
1-M
3-P
GV
FRS
BLU
YEL
RED
NOTE #6
LS
RED
ORN
PRS
(WHEN USED)
LGPS
FUSED DISCONNECT
SWITCH (WHEN REQ'D)
NOTE #4
WHT
GRN
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)
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 9-CIRCUIT CONNECTOR
PL2 2-CIRCUIT PCB CONNECTOR
PL3 3-CIRCUIT IDM CONNECTOR
PL4 3-CIRCUIT IDM EXTENSION CONNECTOR
PL5 2-CIRCUIT HSI/PCB CONNECTOR
PRS PRESSURE SWITCH, SPST-(N.O.)
SW1 & 2 BLOWER OFF DELAY
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 #8
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
PL52
PL2
3
PL3
PR2
115VAC
PR1
TRAN
24VAC
1
2
BRN
M
IDR
TEST/TWIN
FU1
NOTE #7
IDM
OL
AUX
BRN
CAP -2
CAP-1
L2
FRS
LS
LGPS
(WHEN USED)
NOTE #6
PL1
PRS
GV
2-C
1-M
3-P
NOTE #5
8
FSE
9
6
5
CPU
HSIR
IDR
BLWR
Y
G
C
R
W
GVR-2
SEC-1
HI/LO
GVR
GVR-1
SEC-2
NOTES:
322854-101 REV. D (LIT)
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 PROVE
FLAME.
6. FACTORY CONNECTED WHEN LGPS NOT USED.
7. REPLACE ONLY WITH A 3 AMP FUSE.
8. YELLOW LEAD NOT ON ALL MOTORS.
9. BLOWER-ON DELAY, GAS HEATING 60 SECONDS, COOLING OR HEAT PUMP 2 SECONDS.
10. BLOWER-OFF DELAY, GAS HEATING 90, 135, 180 OR 225 SECONDS, COOLING OR
HEAT PUMP 90 SECONDS. (135 SECONDS ONLY ON SOME MODELS)
11. IGNITION-LOCKOUT WILL OCCUR AFTER FOUR CONSECUTIVE UNSUCCESSFUL
TRIALS-FOR-IGNITION. CONTROL WILL AUTO-RESET AFTER THREE HOURS.
12. SOME MODELS MAY HAVE SPADE QUICK CONNECT TERMINALS.
BLK
OM
SW2
SW1
OM
2
3
4
7
1
OM
HUM
1
23
WHT
BLK
GRN
PL4
PL4
2
3
1
NEUTRAL
NEUTRAL
WHT
ILK
FU2
BLK
L1
ILK
(NOT ON ALL MODELS)
SEE NOTE #10
NOTE #12
GND
GND
A99106
→ Fig. 15—Wiring Diagram
11