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Fig. 6—Unit Wiring Diagram
A95464
LEGEND
ALS AUXILIARY LIMIT SWITCH, OVERTEMP.
-MANUAL RESET, SPST-(N.C.)
BLWM BLOWER MOTOR
CAP CAPACITOR
CFR COOLING FAN RELAY, SPDT
DSS DRAFT SAFEGUARD SWITCH, SPST-(N.C.),
MANUAL RESET
EAC-1 ELECTRONIC AIR CLEANER CONNECTION (115 VAC)
EAC-2 ELECTRONIC AIR CLEANER CONNECTION (COMMON)
FL FUSIBLE LINK
FU1 FUSE, 3 AMP, AUTOMOTIVE BLADE TYPE
FU2 FUSE FIELD INSTALLED
GV GAS VALVE-REDUNDANT OPERATORS
HFR HEATING FAN RELAY, SPST (N.O.)
IDM INDUCED DRAFT MOTOR
IDR INDUCED DRAFT RELAY, SPST-(N.O.)
ILK BLOWER ACCESS PANEL INTERLOCK SWITCH,
SPST-(N.O.)
JB JUNCTION BOX
LS LIMIT SWITCH, AUTO RESET, SPST(N.C.)
OL AUTO-RESET INTERNAL MOTOR OVERLOAD TEMP. SW.
PCB PRINTED CIRCUIT BOARD (FURNACE CONTROL)
PL1 9-CIRCUIT CONNECTOR (PCB1)
PR5 PRESSURE SWITCH, SPDT
TRAN TRANSFORMER (115V AC/24V AC)
JUNCTION
UNMARKED TERMINAL
PCB TERMINAL
FACTORY POWER WIRING (120 AC)
FACTORY CONTROL WIRING (120 AC)
FIELD POWER WIRING (120 AC)
CONDUCTOR ON PCB
FIELD WIRING SCREW TERMINAL
FIELD GROUND
EQUIPMENT GROUND
FIELD SPLICE
PLUG RECEPTACLE
NOTES:
322876-101 REV. A
1. Internally connected to equipment ground through mounting screw.
2. If any of the original equipment wire is replaced, use wire rated for 105°C.
3. Blower motor (BLWM) & Inducer motor (IDM) contain auto-reset
thermal overload switch.
4. Use only copper wire between the disconnect switch and the furnace
junction box (JB).
5. Symbols are electrical representations only6.
6. Auxiliary limit switch (ALS) used on downflow models only.
7. The transformer 24VAC winding is protected by a 3 AMP automotive
blade type fuse on the control board. A 24VAC short to ground during
installation, checkout, operation, service or maintenance could cause
this fuse to open. Do not replace the 3 AMP fuse with any other size fuse.
8. Blower motor (BLWM) adjustable OFF-DELAY. Factory set: 120 seconds
cut resistor: 180 seconds.
9. When CFR relay is energized, HFR relay is also energized.
FUSED DISCONNECT
SWITCH (WHEN REQ’D)
FU2
WHT
GRN
GRN
JB
IDM
ILK
TH
GV
PRS
FL
TR
PILOT
MGV
BRN
DSS
NO
C
NC
YEL
LS
ALS
(WHEN USED)
NOTE #6
WHT
RED
RED
BLU
BRN
ORN
BLK
RED
BLU
BLK
BLK
BLU
L1
PR1
PL1
WHT
BLK
TRAN
WHT
RED
WHT
NOTE #4
BLK
WHT
BLK
PR2
L2
HFR
CFR
LO
HI
COM
NOTE #9
EAC-2
EAC-1
SPARE-1
SPARE-2
IDR
147
258
369
SEC-2
SEC-1
PCB
FU1
3AMP
FUSE
GROUND
SCREW
REQUIRED
NOTE #1
NOTE #7
GWYRC
NOTE #8
OL
START
BRN
BRN
CAP
BLK (HI)
RED (LO)
WHT (
C
OM)
YEL (MED HI)
BLU (MED LO)
GRN
RED
BLU
MGV
ILK
L1
L2
TO 115V AC FIELD DISCONNECTIONS
NOTE #4
EQUIPMENT GROUND
L1
IDR
PL1-3
PL1-1
L1
EAC-2
SPARE-1
HEAT
SPARE-2
COOL
COM
EAC-1
START
OL
COM
HI
MED HI
MED LO
LO
BLWM
CAP
CFR
HFR
NOTE #9
IDM
PR-2
SEC-2
FL
ALS
PL1-4
FU1
PR-1
(WHEN USED)
NOTE #6
3A
SEC-1
FUSE
NOTE #7
LS
115V AC
TRAN
24V AC
HFR
LOGIC
TIME
DELAY
GV
TR
PL1-8
TH
DSS
PILOT
IDR
PL1-2
NOTE #9
C
PRS
NO
NC
PL1-6
IDR
Y
W
G
PL1-9
PL1-7
R
CFR
C
SCHEMATIC
DIAGRAM
BLWM
CONNECTION DIAGRAM
6