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8. W
D
IRING
IAGRAMS
Risk of electric shock. Disconnect power before installation, servicing, maintenance or field wiring. Replace all panels
before operating. Failure to do so can result in electric shock causing severe injuries or death.
21ECM18 & 21ECM20 Models
E
ARTP
R
B
HEAT 4
E
ARTP
R
B
HEAT 3
E
ARTP
R
B
HEAT 2
E
ARTP
R
B
HEAT 1
B
B
R
W
L2
R
R
R
NC
R
N
R
M
G
C=COM
1=LO
L=LINE
2=MED HI
G=GROUND
3=MED HI
B
N=NEUTRAL
4=HI
5=HI
L1
B
B
B
21ECM23 Model
E
ARTP
R
B
HEAT 5
E
ARTP
B
R
HEAT 4
W
E
ARTP
R
HEAT 3
E
ARTP
R
HEAT 2
E
ARTP
R
HEAT 1
B
R
W
L2
R
R
R
NC
R
R
B
N
R
M
G
C=COM
1=LO
L=LINE
2=MED HI
G=GROUND
3=MED HI
B
N=NEUTRAL
4=HI
5=HI
L1
B
B
B
FE0050A
All manuals and user guides at all-guides.com
(
'
)
CONT
D
Open: 93.3°C
MRTP 1
W
HEAT 4
KC4
COM
NO
R
B2
W
24V
PP
50 A
DC
HEAT 3
KC3
COM
NO
R
W
24V
P
DC
HEAT 2
P
KC2
COM
NO
B1
24V
W
BR
DC
R
50 A
HEAT 1
KC1
NO
COM
R
24V
W
GR
DC
W
K7
Speed Selector
3
1
24V
P
DC
LO
4
5
BL
R
MED
Y
2
6
BL
O
TB
B (HI)
M
5
NC
N
4
BL (MED)
G
3
Y (MED)
L
2
R (LO)
C
1
B3
HEAT 5
25 A
KC5
COM
NO
R
24V
W
DC
HEAT 4
PP
KC4
PP
COM
NO
R
B2
24V
50 A
DC
HEAT 3
KC3
COM
R
NO
B
24V
W
P
DC
HEAT 2
P
KC2
COM
NO
B
R
B1
24V
BR
W
DC
50 A
HEAT 1
KC1
NO
COM
B
R
W
24V
GR
DC
B
B
W
K7
1
3
Speed Selector
24V
P
DC
LO
4
5
BL
R
MED
Y
2
6
BL
O
TB
B (HI)
M
5
NC
N
4
BL (MED)
G
3
Y (MED)
L
2
R (LO)
C
1
!
WARNING
MRTP 2
W
W
PP
P
BR
GR
Power
1
2
3 4
5 6
7
P3
BOARD POWER SUPPLY
Heat Activation
PP
B
PP
P2-8
GR
P2-7
HEAT
P2-6
INDICATOR
PP
P2-5
PP
P2-4
B
P2-3
GR
P2-2
18/20 KW 240 VAC
Single phase
P2-1
P2
O
B
B
B
W
RLY PWR2
W
HEAT5
P
HEAT6
HEAT5 IN
P
MRTP 1
Heater
HEAT6 IN
PP
Logic
P
24V
W
GR
regulated
GR
P
P
PP
P
BR
GR
WHT
W
Power
1
2 3 4 5
6 7
P3
BOARD POWER SUPPLY
Heat Activation
PP
B
PP
P2-8
GR
P2-7
HEAT
P2-6
INDICATOR
PP
P2-5
PP
P2-4
B
P2-3
GR
P2-2
23 KW 240 VAC
Single phase
P2-1
P2
O
B
B
B
W
- 9 -
Y
W
F1
1. If any of the original wire, as supplied, must
5 AMPS
be replaced, use the same equivalent wire.
Wiring must comply with applicable codes,
ordinances and regulations.
24 VAC
COMMON OUT
2. Field wiring must comply with applicable
FUSED 24 VAC
codes, ordinances and regulations. Use only
POWER OUT
Class 1 wiring inside furnace compartments.
CALL FOR FAN
Line voltage wiring:
CALL FOR COOL
UL AWM 1015/1230, 600V, 105°C, VW-1, 12 AWG;
CSA TEW 600V, 105°C, FT1, 12 AWG.
REVERSING VALVE
CALL FOR HEAT 1
Low voltage wiring:
same ratings as high voltage except 18 AWG.
CALL FOR HEAT 2
CALL FOR COOL 1
FAN MOTOR SPEED
P1
HI
MED
R
T
R
MED
Class 2 Transformer
Pri: 240 V 60 Hz
LOW
Sec: 24 V 60 Hz 40 VA
R
Y
B
Y
C
Capacitor
E
Heating Element
KC
Heating Element Relay
K
Fan Relay
Open: 93.3°C
ARTP
Auto-Reset Thermal Protector
MRTP 2
W
Y
MRTP
Manual-Reset Thermal Protector
M
Fan Motor
TB
Terminal Block
T
Transformer Class 2
YEL
HEAT
Heat
L1, L2
240 V Line Supply
N
Neutral
F1
F1
Fuse
5 AMPS
B
Breaker
24 VAC
COMMON OUT
Low power
High power
FUSED 24 VAC
POWER OUT
High power 8 AWG
CALL FOR FAN
WIRING COLOR CODE
CALL FOR COOL
REVERSING VALVE
CALL FOR HEAT 1
CALL FOR HEAT 2
CALL FOR COOL 1
P1
For the use of a two-stage
R
T
R
thermostat or an outdoor
Class 2 Transformer
Pri: 240 V 60 Hz
Sec: 24 V 60 Hz 40 VA
thermostat, connect between
R
Y
W1 and W2. Make sure that the
Y
B
Heat Activation switch is set to
"Slow" position.
Critical characteristic
COLOR
BLACK
BLUE
YELLOW
RED
LEGEND
B
BLACK
BL
BLUE
BR
BROWN
GR
GREY
O
ORANGE
P
PINK
PP
PURPLE
R
RED
W
WHITE
Y
YELLOW
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