Unitary Products Group
15
035-15266-003 Rev. A (0804)
FIGURE 21 :
EB20B WIRING DIAGRAM
3A
LINE
LOAD
2
4
5
6
1
3
*
MODEL: EB20B
4-SPEED BLOWER
EB SERIES FURNACES
BLEND AIR
CONTROL BOX
HEAT/COOL
T’STAT
COND. UNIT
CONTACTOR
MOTOR
TRANSFORMER
FUSE
BLOWER
RELAY
2 SPADE (INSUL.) TERMINALS
USED WHEN CHANGING
SPEEDS
SEQUENCER
CIRCUIT #1
BREAKER
ELEMENTS
LIMIT
SWITCHES
GND. LUG
CIRCUIT 1
240 VAC.
60 Hz
1 PHASE
DUAL BRANCH
CIRCUIT SERVICE
R
R
H4
H3
M7
M8
M3
M4
YEL
YEL
BLK
BLU
YEL
YEL
YEL
ORG
YEL
BLK
BLK
BLK
RED
RED
GRN
WHT
RED
BLK
G
W
RH
Y
BRN
ORG
CAPACITOR
BLU-MED.
HIGH
SP
.
YEL-MED.
LOW
SP
.
BLK-COOLING
SP
.
RED-HEA
TING
SP
.
ORG-COMMON.
H2
H1
WHT
BLK
R
RED
CIRCUIT #2
BREAKER
CIRCUIT 2
240 VAC.
60 Hz
1 PHASE
GND. LUG
240 VAC.
60 Hz
1 PHASE
SINGLE BRANCH
CIRCUIT SERVICE
CIRCUIT #1
BREAKER
CIRCUIT #2
BREAKER
60
AMP
GND. LUG
WIRING MUST CONFORM TO LOCAL CODES
APPROVED FOR CU CONDUCTORS ONLY.
NOTE:
IF ANY OF THE ORIGINAL WIRE SUPPLIED WITH
THIS UNIT MUST BE REPLACED. IT MUST BE
REPLACED WITH TYPE 105°C THERMOPLASTIC
OR ITS EQUIVALENT. FACTORY WIRING SHOWN
SOLID. FIELD WIRING SHOWN BROKEN.
4 LEADS +
2 GROUNDS
CKT #1 - CKT #2
DUAL BRANCH
CIRCUIT SERVICE
BRANCH CKT. LOAD-AMPS
BRANCH CKT. MIN. AMPACITY
WIRE SIZE (75° C) COPPER
WIRE SIZE (60° C) COPPER
MAX. FUSE SIZE
(OR CB) - AMPS
D.O.E. OUTPUT CAPACITY - BTU
67,000
MAX. MOTOR-FLA
4.0
2 LEADS +
1 GROUND
NOMINAL CIRCUIT LOAD-AMPS
84.0
WIRE SIZE (75° C) COPPER
WIRE SIZE (60° C) COPPER
#2
#1
MAX. FUSE SIZE
(OR CB) - AMPS
110
240 VAC - 60 Hz - 1 PHASE
44.0
40
55
50
#6
#8
#6
#6
60
50
SINGLE BRANCH
CIRCUIT SERVICE
RED
RED
M5
M6
15
M1
M2
RED
R
BLK
60
AMP
60
AMP
60
AMP
GRN
WHT
ORG
ORG
L
L
L
L
‡
‡
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