Airstream TC5-2V4SA User Manual page 53

PROBLEM
Stage 1 or 2
fans run
continuously at
full speed.
Stage 1 or 2
fans run
erratically.
Stage 1 fans do
not stop
running when
the controller
is operating in
minimum
ventilation
cycle.
CAUSE
The wiring is incorrect.
The ambient temperature
is above the set point.
The selected motor
curve is inappropriate.
The differential is too
small.
The time on or time off
is too short.
Time off is set to zero.
The wiring is incorrect.
Humidity compensation
is activated and relative
humidity exceeds set
point.
TC5-2V4SA
SOLUTION
Fix the wiring.
Adjust the set point to the desired
value.
Select an appropriate motor
curve.
Adjust the differential to a higher
value.
Adjust the time on or time off to a
higher value.
Set time off to a value other than
zero.
Correct the wiring. In particular,
make sure two different lines
are connected to each 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.
Adjust set point or deactivate
compensation as required.
TC5-2V4SA rev.06
53