4
ST 5110
QM 1329.rev.00
PROBLEM
SOLUTION
CAUSE
The stage 1
variable speed
cooling fans run
continuously
when the room
temperature is
below the room
set point
(minimum
ventilation
cycle).
The stage 1 time off
is set to zero.
Set the stage 1 time off to
a value other than zero.
The wiring is
incorrect.
Correct the wiring. Be sure
two different lines are con-
nected to each fan motor: line
L1 modulated by the controller
should be combined with
another line (N for 115V or L2
for 230V) to activate the motor.
Also, be sure the
stage 1 COMMON is supplied
by line L1.
The mist is not
operating as
desired.
The mist time on and time off
are in minutes. Adjust the mist
time on and time off correctly.
The mist time on
and time off were
incorrectly adjusted.
The cooling
fans are not
running.
or
The heaters are
not turning on.
The wiring is
incorrect.
Correct the wiring. Be sure
two different lines are con-
nected to each fan motor or
heater: the controller's output
line L1 should be combined
with another line
(N for 115V or L2 for 230V) to
activate the fan motor or
heater. Also, be sure the
stage's COMMON is supplied
by line L1.
The stage's fuse is
open.
Replace the fuse.
