8
TC4-2N6F.rev.07
Digital display
Displays the parameters shown around the parameter selection knob.
Stage 1 and 2 pilot light
Flashes when the stage 1 fans are on. Turns on when the stage 2
fans are on.
Curtains A pilot light
Flashes when the zone A curtains are closing. Turns on when the
zone A curtains are opening.
Curtains B pilot light
Flashes when the zone B curtains are closing. Turns on when the
zone B curtains are opening.
Stage 3 - 5 pilot light
Flashes when the stage 3 fans are on. Turns on when the stage 5
fans are on.
Heater-mist pilot light
Flashes when the mist units are on. Turns on when the heaters are on.
Temperature curve pilot light
Turns on when the temperature curve is activated and flashes when
both the temperature and minimum speed curves are activated.
Defective probe pilot light
Turns on when a probe is defective.
Locked parameter pilot light
Turns on when the parameters are locked.
Push-button
Used to access the various adjustments.
Parameter selection knob
Used to select a parameter.
Adjustment knob
Used to adjust the value of a selected parameter.
1
2
3
4
5
6
7
8
9
10
11
12
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TC4-2N6F.rev.07
CAUSE
SOLUTION
PROBLEM
The display
shows sudden
variations in the
room or outside
temperature.
A variation in
resistance is
induced on a
probe.
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"
There is electrical
noise near a probe
cable.
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°.
The stage 1 or
stage 2 variable
speed fans are
not running.
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.
The wiring is
incorrect.
Replace the fuse.
The stage 1 or
stage 2 fuse is open.
The display board
interconnect cable
is not properly
plugged into the
power supply board.
Be sure the cable is firmly
plugged in.
The minimum speed
is too low.
Adjust the minimum speed to a
higher value.
The fan motor is
defective.
Check if the motor is defective
by connecting it to an alternate
power supply. If it still is not
operating, replace the motor.
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