Table of Contents
Advertisement
PROBLEM
The display
shows sudden
variations in the
room or outside
temperature.
The stage 1 or
stage 2 variable
speed fans are
not running.
CAUSE
A variation in
resistance is
induced on a
probe.
There is electrical
noise near a probe
cable.
The wiring is
incorrect.
The stage 1 or
stage 2 fuse is open.
The display board
interconnect cable
is not properly
plugged into the
power supply board.
The minimum speed
is too low.
The fan motor is
defective.
SOLUTION
Be sure the probes are dry.
Locate them away from drafts
and sources of radiant heating.
Be sure the outside probe is
installed correctly. Refer to
"Installing the Outside Probe"
Isolate the probe cables from
all high voltage sources. Do
not route probe cables and
other power cables through the
same electrical knockout. Do
not run probe cables next to
other power cables. When
crossing other power cables,
cross at 90°.
Correct the wiring. Be sure two
different lines are connected to
each fan motor: line L1 modu-
lated 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 and 2 COM-
MON is supplied by line L1.
Replace the fuse.
Be sure the cable is firmly
plugged in.
Adjust the minimum speed to a
higher value.
Check if the motor is defective
by connecting it to an alternate
power supply. If it still is not
operating, replace the motor.
TC4-2N6F.rev.07
45
Advertisement
Table of Contents
