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Fig. 16—Wiring Diagram A02157
PCB
TRAN
FRS
NOTE #11
LS
PRS
(WHEN USED)
LGPS
FUSED OR CIRCUIT BREAKER
DISCONNECT SWITCH (WHEN REQ’D)
NOTE #2
JB
L1
L1
BLWR
HI/LO
TO 115VAC FIELD DISCONNECT
NOTE #2
EQUIPMENT GROUND
SPARE-1
HEAT
FAN
COOL
HSIR
EAC-1
START
OL
HI
MED HI
MED LO
LO
BLWM
SCHEMATIC DIAGRAM
(NATURAL GAS & PROPANE)
1
1HSI
2
PL32
PL2
115VAC
PR1
TRAN
24VAC
M
IDR
TEST/TWIN
F U 1
NOTE #6
IDM
OL
AUX
CAP - 2
CAP-1
L2
FRS
LS
LGPS
(WHEN USED)
NOTE #11
PRS
FSE
9
1
5
CPU
PCB
Y1
G
C
R
W
SEC-1
GVR-1
NOTES:
326796-101 REV. A
OM
10
4
6
2
PL4
2
3
1
NEUTRAL
ILK
FU2
L1
ILK
GND
RED
BLU
ORN
WHT
RED RED
ORN
RED
RED
GRN/YEL
YEL
BLU
BLU
RED
WHT
BLK
LED 1
12345678910
BLOWER OFF DELAY
JUMPER SELECT
YEL
OL
START
BLK
WHT
WHT
BRN
IDM
BRN
CAP -2
AUX
OL
M
HSI
WHT
BLK
BLK
WHT
WHT (COM)
BLK
BLK
WHT
WHT
2
1
PL2
WHT
BLK
BLK
BLWM
CAP -1
SPARE 1
SPARE 2
EAC-1
PR1
SEC-2
SEC-1
EAC-2
SEC-2
8
7
3
PL1
2
1
PL3
3
2
1
PL4
BRN
BRN
RED (LO)
WHT
(COM)
YEL
BLU
(MED LO)
COM
HUM
GVR-2
DHUM
Y/Y2
(MED HI)
FAN
11
WHT
PL1
11
L2
GRN/YEL
GRN/YEL
GRN/YEL
GND
NOTE #3
GV
M
C
NOTE #3
GV
M
C
GRN/YEL
GRN/YEL
FSE
NOTE #10
WHT
Y1
R
Y/Y2
W
C
HUM
om
TEST/TWIN
24V
FU1
J1
180
150
120
90
G
DHUM
NOTE #6
EAC-2
L2
NEUTRAL
NOTE #8
BLW
L1
FAN
BHT/CLR BFANR BLWR
COOL
HEAT
BLK (HI)
L
E
G
E
N
D
BFANR CONTINUOUS-FAN SELECT RELAY, SPDT
BHT/CLR BLOWER MOTOR SPEED CHANGE RELAY, SPDT
BLWR BLOWER MOTOR RELAY, SPST-(N.O.)
BLWM BLOWER MOTOR, PERMANENT-SPLIT-CAPACITOR
CAP 1, 2 CAPACITOR
CPU MICROPROCESSOR AND CIRCUITRY
EAC-1 ELECTRONIC AIR CLEANER CONNECTION (115 VAC 1.0 AMP MAX.)
EAC-2 ELECTRONIC AIR CLEANER CONNECTION (COMMON)
FRS FLAME ROLLOUT SW. -MANUAL RESET, SPST-(N.C.)
FSE FLAME-PROVING ELECTRODE
FU 1 FUSE, 3 AMP, AUTOMOTIVE BLADE TYPE, FACTORY INSTALLED
FU 2 FUSE OR CIRCUIT BREAKER CURRENT INTERRUPT DEVICE
(FIELD INSTALLED & SUPPLIED)
GND EQUIPMENT GROUND
GV GAS VALVE-REDUNDANT
GVR 1, 2 GAS VALVE RELAY, DPST-(N.O.)
HSI HOT SURFACE IGNITER (115 VAC)
HSIR HOT SURFACE IGNITER RELAY, SPST-(N.O.)
HUM 24VAC HUMIDIFIER CONNECTION (0.5 AMP. MAX.)
IDM INDUCED DRAFT MOTOR, PSC
IDR INDUCED DRAFT MOTOR RELAY, SPST-(N.O.)
ILK BLOWER ACCESS PANEL INTERLOCK SWITCH, SPST-(N.O.)
J1 BLOWER - OFF DELAY JUMPER SELECTOR
JB JUNCTION BOX
LED LIGHT-EMITTING DIODE FOR STATUS CODES - AMBER
LGPS LOW GAS PRESSURE SWITCH, SPST-(N.O.)
LS LIMIT SWITCH, AUTO-RESET, SPST (N.C.)
OL AUTO-RESET INTERNAL MOTOR OVERLOAD
TEMPERATURE SWITCH (N.C.)
PCB PRINTED CIRCUIT BOARD CONTROL
PL1 11-CIRCUIT PCB CONNECTOR
PL2 2-CIRCUIT CONNECTOR
PL3 2-CIRCUIT HSI, CONNECTOR
PL4 3-CIRCUIT IDM EXTENSION CONNECTOR
PRS PRESSURE SWITCH, SPST-(N.O.)
TEST/TWIN COMPONENT TEST & TWIN TERMINAL
TRAN TRANSFORMER-115VAC/24VAC
JUNCTION
UNMARKED TERMINAL
PCB CONTROL TERMINAL
FACTORY WIRING (115VAC)
FACTORY WIRING (24VAC)
FIELD WIRING (115VAC)
FIELD WIRING (24VAC)
CONDUCTOR ON CONTROL PCB
FIELD WIRING SCREW TERMINAL
FIELD EARTH GROUND
EQUIPMENT GROUND
FIELD SPLICE
PLUG RECEPTACLE
1. If any of the original equipment wire is replaced use wire rated for 105°C.
2. Use only copper wire between the disconnect switch and the furnace junction box (JB).
3. This wire must be connected to furnace sheet metal for control to prove flame.
4. Symbols are electrical representation only.
5. Solid lines inside PCB are printed circuit board conductors and are not included in legend.
6. Replace only with a 3 amp fuse.
7. Inducer (IDM) and blower (BLWM) motors contain internal auto-reset thermal overload switches (OL).
8. Neutral connections are interchangeable within the NEUTRAL connector block.
9. Blower motor speed selections are for average conditions, see installation instructions for details on
optimum speed selection.
10. YELLOW lead not on all motors.
11. Factory connected when LGPS is not used.
12. Ignition-lockout will occur after four consecutive unsuccessful trials-for-ignition. Control will
auto-reset after three hours.
13. Blower-on delay: gas heating 60 seconds, cooling or heat pump 2 seconds.
14. Blower-off delay: gas heating selections are 90, 120, 150 or 180 seconds, cooling or heat pump
90 seconds or 5 seconds when dehumidify call is active.
NOTE #10
PRINTED CIRCIUT BOARD
PRINTED CIRCIUT BOARD
NOTE #5
A02157
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