60
THIS DATA IS SUBJECT TO CHANGE WITHOUT NOTICE
440 01 2021 01
15 .
Wiring Diagram (Variable Speed Blower Motor)
33071
1-101 REV
. B
2 STAGE
SINGLE
STAGE
1 2 3
ON
FACTORY
SETTING
60 SEC.
THERMOSTAT TYPE
SW1-3
100 SEC.
BLOWER DELAYS
COOL ON 5 SEC
COOL OFF 90 SEC
HEAT - ON
HIGH 30 SEC.
LOW 45 SEC.
EAC + HUM
1.0A MAX COMBINED
FURNACE CONTROL, SW1 HEAT OFF DELAY
SW1-1, SW1-2
140 SEC.
180 SEC.
NEUTRAL
INTERLOCK
SWITCH
TO 115VAC
FIELD DISCONNECT
EQUIPMENT
GROUND
N
N
N
N
N
N
3
2
1
N
HUM
HOT
IGNITION RELAY
P2
LOW/HIGH INDUCER
RELAY
INDUCER
RELAY
LOW/HIGH BLOWER
RELAY
HEAT/COOL
RELAY
HEAT L
HEAT H
COOL
M2
BLOWER
RELAY
EAC
CONT FAN
DC MTR
XFMR
115VAC
TRANSFORMER
CAPACITOR
(SOME MODELS)
INDUCER MOTOR
LO
HI
P5
2
1
3
P4
1
2
IGNITER
P1-5
P1-1
P1-11
NOTE #8
P1-9
24VAC
24VAC
COM
LOW PRESSURE SWITCH
LP PRESS SW. (WHEN USED)
BVSS
(FIELD
INSTALLED)
HIGH
PRESS. SWITCH
GAS VALVE
RELAY
PRINTED
CIRCUIT
BOARD
NOTE
#5
DEHUM
MAIN LIMIT
P1-7
FUSE 5A
NOTE #6
HIGH PRESS. SW. RELAY
CONNECTION DIAGRAM
LADDER DIAGRAM
WARNING: ELECTRICAL SHOCK HAZARD
DISCONNECT BEFORE SERVICING
3
2
1
2
1
P5
P1
TR
A
N
S
F
O
R
M
E
R
115V
A
C
NO
T
E
#1
1
P2
1
DIAG NOS T IC
LE D
CO
L
O
R
CO
D
E
NOTE:
1. If any of the original equipment wire is replaced use wire rated 105º C.
2. Use only copper wire from disconnect switch to furnace junction box.
3. Wire must be connected to furnace metal for control to prove flame.
4. Symbols are electrical representation only.
5. Solid lines inside circuit board are printed circuit board traces and are
not depicted as shown in the legend.
6. Replace only with a 5 amp fuse.
7. See installation instructions for details on blower speed selection.
8. Factory connected when LP Pressure Switch and BVSS (Chimney
Adapter Accessory Kit) are not installed.
9. Ignition lockout will occur after four consecutive unsuccessful trials for
ignition. Control will auto-reset after three hours.
10. Blower motor and inducer motor contains internal auto-reset thermal
overload switch.
11. Flame sensor: 0.7 µA D.C. minimum, 2.0 - 4.0 µA nominal.
LO
W
V
O
LT
A
G
E
F
A
C
T
O
R
Y
L
O
W
V
O
L
T
A
G
E F
IEL
D
LI
N
E
V
O
LT
A
G
E
F
A
C
T
O
R
Y
LI
N
E
V
O
LT
A
G
E
F
IE
L
D
CO
N
D
U
C
T
O
R
O
N
CO
N
T
R
O
L
JU
N
C
T
IO
N
UN
M
A
R
K
E
D
T
E
R
M
IN
A
L
CO
N
T
R
O
L
T
E
R
M
IN
A
L
GY
R
ROLL
OUT SWIT
CH 1
T
O
2
IN SERIES DEPENDING
ON MODEL
MAIN LIMIT
R
R
B
V
SS
(W
H
E
N
U
S
E
D
)
SEN
S
O
R
LOW
P
R
ESSU
R
E
SW
IT
C
H
LP
P
R
E
S
S
U
R
E
S
W
IT
C
H
(L
P
M
O
D
E
LS
ON
LY
)
NO
T
E
#8
O
Y
GR
N
/Y
CA
P
A
CI
T
O
R
(S
O
M
E
M
O
D
E
L
S
)
IN
D
U
C
E
R
MO
T
O
R
CO
P
P
E
R
CO
N
D
U
C
T
O
R
S
O
N
L
Y
HO
T
NE
U
T
R
A
L
GN
D
JU
N
C
T
IO
N
BO
X
IN
T
E
R
L
O
C
K
SW
IT
C
H
W
BK
C OM
LO
HI
W
W
BK
BK
R
BK
P4
HS
I
LO
HI
1
R
IG
N
IT
E
R
X F MR
DC
M
T
R
HUM
C ONT
F AN
E AC
C OOL
M2
M1
LO
HE AT
HI
HE AT
5-
A
M
P
DE HUM
W
W
R
C W 2 W 1
G
Y
HUM
1
2 3
ON
O
FF
HE AT OF F -DE LAY
T HE R MOS T AT T Y P E
L1
NE UT R ALS
CPU
VS
P3
1
2
3
4
5
6
24V
A
C
C
O
M
L1
(OPT)
R
W1
W2
Y
G
HUM
24 VAC
C
CO
N
T
R
O
L
BO
A
R
D
R
O
LLOU
T
S
W
IT
C
H
1
T
O
2
IN
S
E
R
IE
S
D
E
P
E
N
D
IN
G
ON
M
O
D
E
L
BK
BK
W
SW
1
1
2
3
4
5
6
7
8
O
Y
BK
6
3
BR
G
4
1
W
BL
FURNACE
24V
AC
TRANS RED
GRN/Y
R
ECM
BLOWER
MOT
OR
Y
F
F
O N
BK
W
W
BK
Y
BR
G
BL
P3
1
2
3
4
5
6
1
2
3
4
5
6
7
8
O
6
3
4
1
FURNACE
24V
AC
TRANS RED
R
F
F
O N
ECM
BLOWER MOT
OR
G
R
EEN
OR
A
N
G
E
RE
D
WH
IT
E
YE
L
L
O
W
GR
N
O
R
W
Y
BL
A
C
K
BL
U
E
BR
O
W
N
GR
A
Y
G
R
EEN
/Y
EL
L
O
W
BK
BL
BR
GY
GR
N
/Y
1 2 3
1 2 3
1 2 3
1 2 3
1 2 3
1 2 3
T
AP-SELECT
TAP-SELECT
24V
A
C
R
BL
NOTE #11
R E
D
B LU
E
W
W
P OWE R
C HOK E
(WHE N
US E D)
P1-10
P1-3
P1-8
NOTE #3
SENSOR
P1-12
P1-4
P1-2
P1-6
GAS
VALVE
MV
HI
C
M1
NOTE #2
BR
NO
T
E
#3
BR
GR
N
/Y
BL
GAS
VALVE
MV
HI
C
1
HIGH
PRESS. SWITCH
P6
24 V AC
P8
P7
J0
4
P8
P7
J0
4
P6
Summary of Contents for *9MPT050F12
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