Wiring
Diagrams
Figure 26 – Fan-Powered Low-Height Units with ECM
(Depending on the size of the unit, the ECM board may or may not be located in the fan control box.)
Duct Pressure Switch Option
4.
LINE VOLTAGE | 4. |
OR FROM HEATER TERMINAL
} |
GR |
| FAN | FAN |
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| MOTOR | MOTOR 2 |
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| (SIZE 10 ONLY) |
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BK
LINE VOLTAGE |
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OR FROM HEATER TERMINAL |
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} | FAN | FAN |
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| MOTOR | MOTOR 2 |
(SIZE 10 ONLY)
GR |
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| GREEN |
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| GROUND |
BK | W | SCREW |
W | BK |
W
BK
Y
BK | W | GREEN | W |
GROUND | BK | ||
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| SCREW | |
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| BK | |
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| W |
TERMINAL
BLOCK
DISCONNECT
SWITCH
2.
3.W
FUSE
BK
24V
Y
BL
2 4
1 24V 3
MOTOR RELAY
NEUT.24V
RED RED
ECM
BOARD
}TO VAV CONTROLLER
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| TERMINAL |
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| BLOCK |
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| 2. |
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| 3. | DISCONNECT |
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| FUSE | SWITCH |
| W |
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| BL |
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| BK |
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| Y |
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W BK | G R |
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| 5. |
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| NO BL |
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| NEUT. | 24V |
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| BL |
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| RED | RED |
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| C |
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| NC |
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| DUCT |
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| PRESSURE |
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| Y | ECM | W BK | G R |
| SWITCH |
| 24V | BL | |||
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| BK | BOARD | ||||
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| TRANSFORMER |
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TRANSFORMER
FAN CONTROL BOX
FAN CONTROL BOX
WARNING
HAZARDOUS VOLTAGE!
DISCONNECT, LOCK OUT AND TAG
ALL ELECTRIC POWER INCLUDING
REMOTE DISCONNECTS BEFORE
SERVICING.
DISCHARGE MOTOR START/RUN
CAPACITORS BEFORE SERVICING.
FAILURE TO DISCONNECT POWER
BEFORE SERVICING CAN CAUSE
SEVERE PERSONAL INJURY OR DEATH.
CAUTION
USE COPPER CONDUCTORS ONLY! |
UNIT TERMINALS ARE NOT DESIGNED
TO ACCEPT OTHER TYPES OF
CONDUCTORS.
FAILURE TO DO SO MAY CAUSE
DAMAGE TO THE EQUIPMENT.
DUCT PRESSURE MAIN CONTROL
5.
BK NO |
| NO |
C | BK | C |
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NC |
| NC |
LINE VOLTAGE | 4. |
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OR FROM HEATER TERMINAL |
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} | GR |
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| GREEN |
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BK | W | GROUND | W |
SCREW | |||
TERMINAL
BLOCK
DISCONNECT
SWITCH
2.
3.W
FUSE
BK
FAN | FAN |
MOTOR | MOTOR 2 |
| (SIZE 10 ONLY) |
| W |
| BK |
BL
BL
Y
P.E. | P.E. |
| BK |
NOTES:
1.FACTORY INSTALLED BY OTHERS
OPTIONAL OR ALTERNATE CIRCUITRY
2.DISCONNECT SWITCH, FUSE, & SCR ARE LOCATED EXTERNAL TO CONTROL BOX.
3.FUSE IS OPTIONAL.
4.DETERMINED BY MOTOR VOLTAGE ON ORDER. VOLTAGE FOUND ON UNIT NAMEPLATE.
5.FOR SERIES FAN POWERED TERMINAL UNITS ONLY.
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| Y |
BK | 24V | BL |
TRANSFORMER
NO
C
NC
P.E. SWITCH
NEUT.24V
RED RED
ECM |
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BOARD |
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FAN CONTROL BOX
54 |
