→
Fig.
14—Unit
Wiring
Diagram
A94074
AUXILIARY LIMIT SWITCH, OVERTEMP.- MANUAL RESET, SPST-(N.C.)
BLOWER MOTOR RELAY, SPST-(N.O.)
BLOWER MOTOR
CAPACITOR
MICROPROCESSOR AND CIRCUITRY
DRAFT SAFEGUARD SWITCH
ELECTRONIC AIR CLEANER CONNECTION (115 VAC 1.5 AMP MAX.)
ELECTRONIC AIR CLEANER CONNECTION (COMMON)
FLAME ROLLOUT SW.-MANUAL RESET, SPST-(N.C.)
FLAME PROVING ELECTRODE
FUSE, 3 AMP, AUTOMOTIVE BLADE TYPE, FACTORY INSTALLED
FUSE OR CIRCUIT BREAKER CURRENT INTERRUPT DEVICE
(FIELD INSTALLED & SUPPLIED)
GAS VALVE-REDUNDANT OPERATORS
GAS VALVE RELAY, DPST-(N.O.)
BLOWER MOTOR SPEED CHANGE RELAY, DPST-(N.O.)
HOT SURFACE IGNITER (115 VAC)
HOT SURFACE IGNITER RELAY, SPST-(N.O.)
24VAC HUMIDIFIER CONNECTION (.5 AMP. MAX.)
INDUCED DRAFT MOTOR
INDUCED DRAFT RELAY, DPST-(N.O.)
BLOWER ACCESS PANEL INTERLOCK SWITCH, SPST-(N.O.)
JUNCTION BOX
LIGHT-EMITTING DIODE FOR STATUS CODES
LOW GAS PRESSURE SWITCH, SPST-(N.O.)
LIMIT SWITCH, AUTO RESET, (N.C.)
AUTO-RESET INTERNAL MOTOR OVERLOAD TEMP. SW.
ALS1
BLWR
BLWM
CAP
CPU
DSS
EAC-1
EAC-2
FRS
FSE
FU1
FU2
GV
GVR
HI/LO
HSI
HSIR
HUM
IDM
IDR
ILK
JB
LED
LGPS
LS
OL
LEGEND
321257-401 REV. A
JUNCTION
UNMARKED TERMINAL
PCB TERMINAL
FACTORY WIRING (115VAC)
FACTORY WIRING (24VAC)
FIELD WIRING (115VAC)
FIELD WIRING (24VAC)
CONDUCTOR ON PCB
PLUG RECEPTACLE
FIELD SPLICE
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 SHEETMETAL FOR CONTROL TO DETECT FLAME.
6. FACTORY CONNECTED WHEN LGPS NOT USED.
7. REPLACE ONLY WITH A 3 AMP FUSE.
8. YELLOW LEAD NOT ON ALL MOTORS.
9. WHEN USED AUXILLARY LIMIT SWITCH (ALS) IS ON DOWNFLOW MODELS ONLY.
PRINTED CIRCUIT BOARD
9-CIRCUIT CONNECTOR
2-CIRCUIT PCB CONNECTOR
3-CIRCUIT IDM CONNECTOR
2-CIRCUIT JB CONNECTOR
2-CIRCUIT HSI/PCB CONNECTOR
PRESSURE SWITCH, SPST-(N.O.)
COMPONENT TEST PIN
TRANSFORMER-115VAC/24VAC
PCB
PL1
PL2
PL3
PL4
PL5
PRS
TEST
TRAN
FIELD WIRING SCREW TERMINAL
FIELD GROUND
EQUIPMENT GROUND
RED
3-P
2-C
1-M
NOTE
#5
GRN
C
PRS
NO
OL
START
BLWM
WHT (COM)
CAP -1
(LO)
RED
NOTE #8
(HI)
(MED HI)
BLK
YEL
WHT
BRN
GRN
WHT (COM)
BRN
BLU
(MED LO)
L2
COM
PR2
EAC-2
1.5 AMP
BLOWER
SPEED
SELECT
EAC-1
FUSE
FU1
24 VAC-3A
HEAT SPARE-2
COOL SPARE-1
90 SEC
135 SEC
180 SEC
225 SEC
BLOWER OFF DELAY
SELECTION CHART
GVR
HSIR
IDR
BLWR
HI/LO
RELAY
ORN
YEL
NOTE #6
SEC-2
SEC-1
WHT
BLK
BLK
BLK
BLK
BLK
WHT
WHT
1
2
HSI
PL5
IDM
FUSED DISCONNECT
SWITCH (WHEN REQ'D)
NOTE #4
JB
WHT
BLK
GRN
GRN
FU2
RED
BLU
FRS2
WHT
FSE
RED
RED
PL1
LED
TEST
PCB
BLOWER
OFF
DELAY
LS
3
2
1
1
2
PL3
PL2
120 VAC
PR1
L1
(WHEN USED)
LGPS
G
R
Y
W
C
HUM
1
2
3
6
9
8
7
4
5
(WHEN USED)
ALS
NOTE #9
TEST
LGPS
FRS2
LS
(WHEN USED)
LS
NOTE #6
PL3
PL2
PL5
PL1
9
6
L2
FU1
NOTE #7
1
7
4
HUM
R
W
L1
OL
START
IDM
HEAT
COOL
COM
NOTE #8
NOTE #4
EQUIPMENT GROUND
L1
L2
LO
HI
BLWR
HSIR
IDR
CAP-1
BRN
BRN
LO
SPARE-2
SPARE-1
MED HI
HI
MED LO
COM
GRN
EAC-1
EAC-2
1
1
BLWM
3
1
2
2
HSI
2
PR1
PR2
SEC-1
SEC-2
CPU
FSE
Y
G
C
8
NOTE #5
GVR-2
DSS
GV
2-C
1-M
3
5
2
HI
LO
HSIR
IDR
BLWR
GVR
GVR-1
TRAN
24VAC
115VAC
SCHEMATIC DIAGRAM
(NATURAL GAS & PROPANE)
ILK
1
2
ALS
3-P
TRAN
BLU
WHT
BLK
2
1
DSS
GV
PL4
ILK
PL4
TO 115VAC FIELD DISCONNECT
PRS
FRS1
FRS1
(WHEN USED)
—14—
