Enviro HL SERIES User Manual

ENVIRO-TEC
41
FORM ET115.24-NOM11 (118)
Fan motor
surges [EC
motor]
Loose motor wiring Reseat motor connector. Tighten all motor connections.
Loose control wiring Verify and/or tighten all control connections.
Intermittent control device
Verify operation of any control device such as drain pan
oat switch, freeze stat, thermostat, etc. When in doubt,
jumper out and verify fan operation.
[EC motor] Fan speed
adjustment outside operating
range
Refer to Fan Calibration curve on unit. Adjust speed on
PWM Controller to value that will allow motor to start.
See instructions for Adjusting EC Motor Speed.
[EC motor] Faulty PWM
signal
Verify PWM signal at motor connector. Refer to PWM
board IOM.
Blower Set Screw loose Tighten Screw onto motor shaft.
Improper duct connections
Verify proper ductwork to unit. Verify ductwork is
installed per SMACNA and ASHRAE guidelines.
Incorrectly sized ducts can cause motor surging.
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.
Poor Airow
Performance
[ECM motor]
Lack of required external static
pressure
External static pressure not as designed. Adjust external
static pressure to design pressure
[24V units] Three speed switch
in wrong position.
Verify three speed switch, if present, is set to desired
speed.
Poor voltage quality Verify input voltage within acceptable parameters.
Speed adjustment outside fan
operating range
Refer to Fan Calibration curve on unit. Adjust speed on
PWM Controller to value that will allow motor to start.
See instructions for Adjusting EC Motor Speed.
Erratic speed command (in
Proportional Control mode)
Verify 2-10V analog signal at Remote Control Input
terminals.
Improper duct connections
Verify ductwork is installed per SMACNA and ASHRAE
guidelines.
Duct obstruction
Verify no obstructions. Verify all dampers are full open
while fan operates.
Improperly set dampers Verify proper inlet air to unit.
Dirty coil
Check cleanliness of coil. Dirty coil ns will restrict
airow.
Dirty lters Check for dirty or blocked lters. Replace as needed.
Damaged or blocked blower Verify blower rotates freely. Clear blockage.

Enviro HL SERIES Specifications

General

Brand	Enviro
Model	HL SERIES
Category	Fan
Language	English