Enviro Series D User Manual

ENVIRO-TEC
38
FORM ET115.24-NOM11 (118)
Fan speed
uctuates [psc
motor]
Fan speed adjustment outside
operating range
If fan speed controller present, adjust fan speed control
screw to full clockwise position. Very that motor speed
stabilizes. Reduce adjustment.
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.
Blower set screw loose Remove power from unit. Tighten screw onto motor shaft.
Improper duct connections
Verify proper ductwork to unit. Verify ductwork is
installed per smacna and ashrae guidelines. Improper
ductwork can cause turbulence at the motor.
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
[psc 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.
Fan speed control adjustment
outside fan operating range
If fan speed controller present. Adjust fan speed control
screw to full clockwise position. Verify airow. Reduce
adjustment to speed that provides desired performance.
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 Series D Specifications

General

Brand	Enviro
Model	Series D
Category	Fan
Language	English