Fig. 23 — 115-v Variable Speed ECM Motor without Controls
NEUTRAL
EVO/ECM-ACU
Signal
Common
RPM
24Vac
NEUTRAL
24Vac
BLK/109
SW1
BLK/101 BLK/102
FU1
115 V
L1
N
GND
BLK/100
DISC1
GRN
USE COPPER SUPPLY WIRES.
24VAC120VAC
BLK/109
WHT/111
GRN
RED/502
TRAN1
WHT/110
RED/503
BRN/504
WHT/110
WHT
WHT/111
GRN
WHT
BLK
3 WIRE
POWER
CABLE
BRN
BRN/501
BLK/103
BLK/104
BLK/506
WHT/505
BLK
BLK/104
LLT*
3
2
1
NOTE 2
RED/503
BLK/506
WHT/505
BRN/504
BLK
WHT WHT
BLK
RED
RED
BRN
BRN/501
RED/507
NOTE: Wires above are insulated
after unit run-test
24V-Hot
24V-Neutral
+ 2-10Vdc Signal
Signal Common
A signal < 1 Vdc
will stop the fan.
LLR*
3
1
2
FIELD CONNECTED TO
REMOTE CONDENSER.
LLR INSTALLED ONLY ON
UNITS WITH DX COILS.
LOW
MED
HIGH
MAX
24Vac
SPEED BOARD
YEL/EC5
SEE NOTE 3
16 PIN
RECEPTACLE
ON MOTOR
5 PIN
RECEPTACLE
ON MOTOR
EC FAN
MOTOR
3
8
16
5
4
3
2
1
15
10
5
YEL
RED/507
RED/508
RED/508
FR
Optional Field Provided and
Installed Fan Relay, Break
wire RED/507 and connect as
shown.
Do NOT break motor
power wiring to start/stop
the fan motor as this will
significantly decrease
the motor life. Break the
24V control wiring as
shown (upper right
corner of drawing) to
start/stop the motor.
LEGEND
DISC — Disconnect Switch
DX — Direct Expansion
ECM — Electronically Commutated Motor
ESP — External Static Pressure
FR — Fan Relay
FU — Fuse
GND — Ground
LLR — DX Low Limit Switch
LLT — Water Coil Low Limit Thermostat
SW — Switch
TRAN — Transformer
Harness Connection
Connection Point Splice
Splice Terminal Connection
Component Tie Point
Optional Wiring
Factory Wiring
Chassis Ground
Earth Ground
*LLT will be replaced by LLR on units with DX coils.
NOTES:
1. Make electrical installation in accordance with job diagram, and in
compliance with national and local electrical codes.
2. Low limit thermostat (LLT) is installed on all units with water coils.
3. Wire YEL/EC5 factory connected to LOW. Positions MED, HIGH, and
MAX are for field use with increased ESP.
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