36
CVS-21HA.rev.03
PROBLEM
CHECK POINTS
The wiring is incorrect.
Correct the wiring. In particular, be sure two
different lines are connected 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 fan
motor. Also be sure the stage 1
and 2 COMMON is supplied by line L1.
The stage 1 fans
do not stop
running when
operating
according to the
minimum
ventilation cycle.
The stage's fuse is open.
Replace the fuse.
The stage 3 fans
or heating units
are not operating.
The display board interconnect cable is not
plugged into the power supply board properly.
Be sure the cable is firmly plugged in.
The wiring is incorrect.
Correct the wiring. In particular, be sure two
different lines are connected to each fan
motor or heating unit: line L1 at the
controller's output should be combined with
another line (N for 115V or L2 for 230V) to
activate the fan motor or heating unit. Also
be sure the stage 3 COMMON is supplied
by line L1.
The fan motor or heating unit is defective.
Connect the fan motor or heating unit to an
alternate power supply. Repair the fan motor
or heating unit if it still is not operating.
The controller is defective.
Listen to see if there is a clicking sound when
the stage's pilot light turns on. If there is no
clicking sound, contact your distributor to get
the controller repaired.
The stage 1 time on is adjusted to a value other
than zero.
Adjust the time on to zero.
