Enviro Series D User Manual

ENVIRO-TEC
42
FORM ET115.24-NOM11 (118)
Fan motor starts
but stops. [EC
motor]
Voltage or ground loss at motor Verify proper voltage and ground at motor.
Blower blocked
Clear blockage. Verify blower rotates freely with motor
disconnected.
Loss of fan speed command.
Verify operation of thermostat or controller. Verify fan
speed command at relay board. Refer to Fan Relay board
troubleshooting guide.
Motor overloaded
Use amp meter to verify motor amps. Disconnect power
from unit. Verify motor rotates freely by hand with blower
disconnected. If not, replace motor. Note: EC motors
may not rotate freely as the rotor aligns with the stator
magnets.
Open ductwork Verify ducts sealed properly.
Motor overheated due to lack
of airow
Verify dampers, if present, are not closed. Verify there
are no obstructions in the discharge ductwork and/or at
the plenum opening. Verify lter is not dirty and does not
obstruct airow.
Voltage or ground loss at motor
Verify proper voltage and ground at motor power
terminals.
PWM board error or faulted
Refer to PWM board status LEDs. Verify all connections.
Cycle power to the board. Refer to PWM board IOM.
Motor fault or end of life. Replace motor.
Faulty motor harness
Reseat connector and verify operation. Disconnect motor
harnesses and verify continuity. Replace motor harness.
EC motor
speed cannot be
adjusted
PWM board error or faulted
Refer to PWM board status LEDs. Verify all connections.
Cycle power to the board. Refer to PWM board IOM.
Improper wiring connections
Verify wiring. If Fan Relay board present, verify all
jumpers installed.
EC wiring harness damaged or
improperly seated
Unplug harness and re-install, making sure plugs are fully
seated. See section on checking wire harnesses, below.
Replace harness if damaged.
No control signal
EC motors may run at idle speed if they lose PWM signal
while enabled.
Verify PWM signal at motor connector. Refer to PWM
board IOM.
ESP (external static pressure)
too high
Verify dampers, if present, are not closed. Verify there
are no obstructions in the discharge ductwork and/or at
the plenum opening. Verify lter is not dirty and does not
obstruct airow.
Motor Control failure Replace motor.
EC motor runs
in reverse,
doesn’t respond
to speed
adjustment
Motor Control failure Replace motor.

Enviro Series D Specifications

General

Brand	Enviro
Model	Series D
Category	Fan
Language	English