Airstream TC4-2N6F User manual

M 890-00146 rev. 07 REV. 01
TC4-2N6F

FOR CUSTOMER USE
Enter the serial number located on the side
of the controller below for future reference.
Model number:
Serial number:
TC4-2N6F
Every effort has been made to ensure that this manual is complete,
accurate and up-to-date. The information contained in it is
however subject to change without notice due to further
developments.

3
TC4-2N6F.rev.07
FEATURES ......................................................................................... 3
PRECAUTIONS .................................................................................. 5
LOCATION OF THE CONTROLS......................................................... 6
INSTALLATION .................................................................................... 9
OPERATION DIAGRAM ...................................................................... 13
USING THE CONTROLLER ................................................................ 14
Parameter Ranges ........................................................................... 14
Factory Settings............................................................................... 15
The Meaning of a Flashing Display ................................................... 16
Temperature Units ............................................................................ 16
Room Temperature ........................................................................... 17
Room Temperature Display ............................................................ 17
Minimum and Maximum Temperature Recall ................................. 18
Minimum and Maximum Temperature Reset .................................. 18
Room Set Point / Temperature Curve ............................................. 19
Outside Temperature ........................................................................ 23
Outside Temperature Display ......................................................... 23
Outside Set Point .......................................................................... 23
Stage 1 Fans ................................................................................... 24
Stage 2 Fans ................................................................................... 32
Stage 3 and 5 Fans .......................................................................... 34
Curtains ............................................................................................ 36
Mist .................................................................................................. 39
Heaters ............................................................................................. 41
Locking the Parameters ................................................................... 42
TROUBLESHOOTING GUIDE ............................................................. 43
TECHNICAL SPECIFICATIONS ........................................................... 47

4TC4-2N6F.rev.07
The TC4-2N6F is an electronic device used for environmental control in
livestock buildings. It allows the user to maintain a specified target
temperature by controlling the operation of ventilation and heating
equipment. Two stages of variable speed fans, two stages of constant
speed fans, as well as curtains, foggers and heaters can be connected to
the controller.
The main features of the controller are as follows:
DIGITAL DISPLAY
A three-digit display provides a high level of accuracy, allowing the user
to specify a temperature to within one tenth of a degree (Fahrenheit or
Celsius).
PILOT LIGHTS
Pilot lights indicating the status of outputs allow you to monitor the
operation of the system from a distance.
MINIMUM VENTILATION CYCLE
When ventilation is not required for cooling, the fans can be operated
either continuously or intermittently to reduce the level of humidity and
supply oxygen to the room.
TEMPERATURE AND MINIMUM VENTILATION SPEED CURVES
The controller can be set to automatically change the temperature
set point and the minimum ventilation speed over a given period of
time in accordance with the user's requirements by specifying a tem-
perature curve and a minimum ventilation curve with up to six differ-
ent set points.
CHOICE OF TEN MOTOR CURVES
The variation in motor speed resulting from a change in voltage will
depend on the make and capacity of the motor. In order to achieve a
high degree of compatibility between controller and motor, the user
can choose from among ten different motor curves, thus ensuring
that the correct voltages are supplied.
49
TC4-2N6F.rev.07
SLAVE BOX NO.3
Supply: - 115/230 VAC (-18%,+8%), 60 Hz, overload and overvoltage
protection fuse F6-1A fast blow.
- 12 VDC for AC back-up supply; can activate mist, heaters and Zone
B curtains if supplied with DC back-up voltage.
Zone B curtains: OPEN-CLOSE output, 115/230 VAC, 60 Hz, 30VDC, 5A
winch output, fuse F1-5A slow blow.
Mist: ON-OFF output, 115/230 VAC, 60 Hz, 30VDC, 6A motor output, 10A
RES, fuse F3-10A slow blow.
Heaters: ON-OFF output, 115/230 VAC, 60 Hz, 30VDC, 6A motor output,
10A RES, fuse F4-10A slow blow.
OTHER
Probes: Low voltage (< 5V), isolated from the supply. Operating range:
-40.0
oF to 120.0 oF (-40.0 oC to 48.9 oC). Accuracy: 1.8°F (1°C) between 41°
and 95°F (5° and 35°C).
Enclosure: ABS, moisture and dust-tight.
The room temperature where the controller is installed MUST AT
ALL TIMES REMAIN BETWEEN 32oAND 104 oF (0oand 40oC).

48 TC4-2N6F.rev.07
MASTER BOX
TC4-2N6F Supply: - 115/230 VAC (-18%,+8%), 60 Hz, overload and
overvoltage protection fuse F6-1A fast blow.
T50-2N6F Supply: - 115/230 VAC (-18%,+8%), 50 Hz, overload and
overvoltage protection fuse F6-1A fast blow.
- 12 VDC for AC back-up supply; can activate Stage 3, Stage 5 as
well as curtains, mist and heaters if supplied with DC back-up voltage.
SLAVE BOX NO.1
Supply: - 115/230 VAC (-18%,+8%), 60 Hz, overload and overvoltage
protection fuse F5-1A fast blow.
- 12 VDC for AC back-up supply
Stage 1: Variable output, 60 Hz, 10A FAN (1/2HP/15VAC)/(1.5HP/230VAC),
fuse F1-15A slow blow.
Stage 2: Variable output, 60 Hz, 10A FAN (1/2HP/15VAC)/(1.5HP/230VAC),
fuse F2-15A slow blow.
SLAVE BOX NO.2
Supply: - 115/230 VAC (-18%,+8%), 60 Hz, overload and overvoltage
protection fuse F6-1A fast blow.
- 12 VDC for AC back-up supply; can activate Stage 3, Stage 5 as
well as Zone A curtains if supplied with DC back-up voltage.
Zone A curtains: OPEN-CLOSE output, 115/230 VAC, 60 Hz, 30VDC, 5A
winch output, fuse F1-5A slow blow.
Stage 3: ON-OFF output, 115/230 VAC, 60 Hz, 30VDC, 6A FAN, 10A RES,
fuse F3-10A slow blow.
Stage 5: ON-OFF output, 115/230 VAC, 60 Hz, 30VDC, 6A FAN, 10A RES,
fuse F4-10A slow blow.
5
TC4-2N6F.rev.07
TWO INDEPENDENT ZONED NATURAL VENTILATION OUTPUTS
Two independent natural ventilation outputs allow the controller to ad-
just the curtain opening according to the temperature of each zone.
OUTSIDE TEMPERATURE COMPENSATION ON NATURAL
VENTILATION OUTPUTS
The curtain timer settings are compensated proportionally to the out-
side temperature. The lower the outside temperature, the faster the cur-
tains close. The higher the outside temperature, the faster the curtains
open.
FULL SPEED FAN START UP
In order to overcome the inertia of the ventilation system components
and de-ice the fan blades in cold weather conditions, the controller sup-
plies maximum voltage to the variable speed fans during 2 sec-
onds at each start-up.
OVERLOAD AND OVERVOLTAGE PROTECTION
Fuses located at the input and outputs of the controller protect its cir-
cuitry in the case of an overload or overvoltage.
COMPUTER CONTROL
When used with a communication module, the controller communi-
cates with a computer. This makes possible the centralization of in-
formation management and a more diversified control strategy.

6TC4-2N6F.rev.07
We strongly recommend installing supplementary natural
ventilation, a failure alarm system as well as a back-up
thermostat on at least one cooling stage (refer to the wiring
diagram enclosed with this user's manual to connect the
thermostat).
Fuses at the input and outputs of the controller adequately
protect its circuitry in the case of an overload or overvoltage.
However, we recommend installing an additional protec-
tion device on the supply circuit as well as an external relay
on all ON-OFF stages to prolong the life of the controller.
To avoid exposing the controller to harmful gases or exces-
sive humidity, it is preferable to install it in a corridor.
The room temperature where the controller is located
MUST ALWAYS REMAIN BETWEEN 32° AND 104°F (0° AND
40°C).
DO NOT SPRAY WATER ON THE CONTROLLER
47
TC4-2N6F.rev.07
CAUSE SOLUTION PROBLEM
Correct the wiring. Be sure
two different lines are connected
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 wiring is
incorrect.
The stage 3
fans are not
running.
or...
The stage 5
fans are not
running.
or...
The heaters are
not turning on.
The stage's fuse is
open.
Replace the fuse.
The display board
interconnect cable
is not properly
plugged into the
power supply board.
Be sure the cable is firmly
plugged in.
The fan motor or
heater is defective.
Check if the motor or heater is
defective by connecting it to an
alternate power supply. If it still
is not operating, replace the
motor or heater.
Listen to see if there is a
clicking sound when the stage
or heater-mist pilot light turns
on. If there is no clicking sound,
your controller needs repair.
The controller is
defective.
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.
Adjust the mist differential
accordingly.
There is a 1°F(0.6°C)
hysteresis on the
mist. See "Mist".

46 TC4-2N6F.rev.07
CAUSE SOLUTION PROBLEM
The stage 1 or
stage 2 variable
speed fans run
erratically.
The selected motor
curve is inappropri-
ate.
Select an appropriate motor
curve. Refer to "Motor Curves"
The band width or
differential is too
small.
Adjust the band width or
differential to a higher value.
The stage 1 time on
or time off is too
short.
Adjust the stage 1 time on or
time off to a higher value.
A variation in
resistance induced
on a room probe
causes this probe to
measure sudden
variations in the
room temperature.
Be sure the room probes are
dry. Locate them away from
drafts and sources of radiant
heating.
Electrical noise near
a room probe cable
causes this probe to
measure sudden
variations in the
room temperature.
Isolate the room 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
variable speed
fans run
continuously
when the room
temperature is
below the room
set point.
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 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 motor.
Also, be sure the stage 1 and 2
COMMON is supplied by line L1.
7
TC4-2N6F.rev.07

8TC4-2N6F.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
45
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.

44 TC4-2N6F.rev.07
CAUSE SOLUTION PROBLEM
There is no
display.
The circuit breaker
at the service panel
is off or tripped.
Reset the circuit breaker.
The wiring is
incorrect.
Correct the wiring.
The voltage selector
switch is in the
wrong position.
Set the switch to the correct
position.
The display board
interconnect cable
is not properly
plugged into the
power supply board.
Be sure the cable is firmly
plugged in.
The display
shows "P" when
the parameter
selection knob
is set to OUT-
SIDE SET-
TINGS.
The outside probe
is connected
improperly.
Correct the outside probe
connection.
The outside probe is
defective.
Refer to "Defective Probes"
The display
shows "P" when
the parameter
selection knob
is set to ROOM.
A room probe is
connected improp-
erly.
Correct the room probe
connection.
A room probe is
defective.
Refer to "Defective Probes"
The defective
probe pilot light
is on.
A room probe is
defective.
Refer to "defective probes"
9
TC4-2N6F.rev.07
Internal switches
Used to set the operating modes as described in the table below.
#
Parameters Locked parameters
Unlocked parameters
DESCRIPTION OPERATING MODE
POSITION
SWITCH
ON
OFF
1
° Celsius
° Fahrenheit
Temperature units ON
OFF
2
3
4
5
6
7
Heater differential
Heater offset ON
OFF
ON
OFF
1°F (0.6°C)
2 °F (1.1°C)
1°F (0.6°C)
2 °F (1.1°C)
13

10 TC4-2N6F.rev.07
To connect the controller, refer to the wiring diagram enclosed with this
user's manual.
Set the voltage switch to the appropri-
ate line voltage.
Route the cables through the electri-
cal knockouts provided at the bottom
of the enclosure. Do not make addi-
tional holes in the enclosure, particu-
larly on the side of the enclosure
when using a computer communica-
tion module.
It may be necessary to install a trans-
former on the heating stage in order to
supply the correct voltage to the
heater.
Mounting Instructions
Remove the four screws in the front cover and lift the cover. Remove the
black caps located on the three mounting holes. Mount the enclosure to the
wall using three screws. Be sure the electrical knockouts are at the bottom
of the enclosure in order to prevent water from entering the controller. Insert
the screws into the mounting holes and tighten. Fasten the black caps
onto the mounting holes.
Connections
Inside of the enclosure
Volta
g
e switch
43
TC4-2N6F.rev.07
TO ADJUST THE HEATER OFFSET
The heater offset can be adjusted to 1°F(0.6°C) or 2°F(1.1°C):
Set switch # 6 to ON to adjust the
heater offset to 1°F (0.6°C).
Set switch # 6 to OFF to adjust the
heater offset to 2°F (1.1°C).
Locking the parameters prevents accidental or unauthorized modification
of the parameter settings. When the parameters are locked, only the room
set point and the points of the temperature curve (if the temperature curve is
deactivated), as well as the stage 1 minimum speed (as long as the
minimum speed curve is deactivated) can be modified. All other settings
can not be modified.
TO LOCK OR UNLOCK THE PARAMETERS
Set switch # 1 to ON to lock the parameters.
Set switch # 1 to OFF to unlock the parameters.
FACTORY SETTING: When the controller is shipped from the factory,
switch # 1 is set to OFF (the parameters are unlocked).
Locking the Parameters

42 TC4-2N6F.rev.07
Description of Operation ( Refer to figure 6 below)
When the room temperature falls to "room set point - heater offset - heater
differential" (point 13), the heaters turn on. When the room temperature
rises to "room set point - heater offset" (point 14), the heaters turn off.
TO ADJUST THE HEATER DIFFERENTIAL
The heater differential can be adjusted to 1°F(0.6°C) or 2°F(1.1°C):
Set switch # 5 to ON to adjust the
heater differential to 1°F (0.6°C).
Set switch # 5 to OFF to adjust the
heater differential to 2°F (1.1°C).
Adjusting the Heater Parameters
Heaters
11
TC4-2N6F.rev.07
It may be recommended to install a latch switch on the zone A or
zone B curtain power unit to stop the stage 1, 2 and 3 cooling fans
as the curtains open for natural ventilation (refer to the USING
THE CONTROLLER section).
ALL WIRING MUST BE DONE BY AN AUTHORIZED
ELECTRICIAN AND MUST COMPLY WITH APPLICABLE
CODES, LAWS AND REGULATIONS. BE SURE POWER
IS OFF BEFORE DOING ANY WIRING TO AVOID
ELECTRICAL SHOCK AND EQUIPMENT DAMAGE.
Temperature Probes
The controller is supplied with one room probe for zone A connected to
terminal # 1, one room probe for zone B connected to terminal # 2 and one
outside probe connected to terminal # 4.
CAUTION : The probes operate under low voltage and are isolated from the
supply. Be sure the probe cables remain isolated from all high voltage
sources. Do not route the probe cables and other power cables through the
same electrical knockout. Do not run the probe cables next to other power
cables. When crossing over other cables, cross at 90o.
Extending the Probes
Each probe can be extended up to 500 feet (150 meters). To extend a probe:
Use a shielded cable of outside diameter between 0.245 and 0.260
in (6.22 and 6.60 mm) to ensure the cable entry is liquid-tight (the
cable dimension should not be under 18 AWG).
It is preferable to weld the cable joint to ensure a proper contact
between the two cables.
Do not ground the shielding.

12 TC4-2N6F.rev.07
Installing the Outside Probe
Run the outside probe cable on the north side of the building, 2 m
(6 ft) below the cornice, inside a pale coloured conduit.
Be sure the probe cable is isolated from sheet metal or any other
conductive material and no cable joint is exposed to air or water.
Installing the Room Probes
Locate the room probe connected to terminal # 1 in the center of
zone A and the room probe connected to terminal # 2 in the center
of zone B.
DefectiveProbes
Room Probes
If one or both room probes are defective, the defective probe pilot light turns
on. If both room probes are defective, the display shows the letter "P" when
the parameter selection knob is set to ROOM and the controller
operates according to the minimum ventilation cycle ( refer to
"Minimum ventilation cycle", page 24). Otherwise, the display shows the
value of the temperature measured by the remaining room probe and the
controller operates according to this temperature.
To identify the defective probe:
• Set the selection knob to ROOM . The room
temperature is displayed.
• Press the push-button. If the probe connected
to terminal # 1 is not defective, the letter "A" is
displayed, alternating with the temperature
measured by probe A. Otherwise, the letter
"A" is displayed, alternating with the letter "P".
• Press the push-button. If the probe connected to terminal # 2 is not
defective, the letter "b" is displayed, alternating with the temperature mea-
sured by probe B. Otherwise, the letter "b" is displayed, alternating with the
letter "P".
41
TC4-2N6F.rev.07
Set the parameter selection knob to MIST. The current
differential appears flashing on the display.
Press the push-button. The word ON and the current time on
alternately appear flashing on the display.
Using the adjustment knob, adjust the time on to the desired
value.
Press the push-button. The word OFF and the current time off
alternately appear flashing on the display.
Using the adjustment knob, adjust the time off to the desired
value.
TO ADJUST THE MIST TIMER
TO ADJUST THE MIST DIFFERENTIAL
Set the parameter selection knob to MIST. The current mist
differential appears flashing on the display.
Using the adjustment knob, adjust the differential to the
desired value.
Adjusting the Mist Parameters

40 TC4-2N6F.rev.07
Mist
Description of Operation ( Refer to figure 5 below)
When the room temperature rises to "room set point + band width 1 +
0.5°F (0.3°C) + differential 2 + differential 3 + curtain dead band +
differential 5 + mist differential" (point 11), the mist begins to operate
according to the mist timer settings. When the room temperature falls to
"room set point + band width 1 + 0.5°F (0.3°C) + differential 2 +
differential 3 + curtain dead band + differential 5 + mist differential - 1°F
(0.6°C)" (point 12), the mist stops operating.
Mist timer:
During TIME ON, the mist is
on. During TIME OFF, the mist
is off.
13
TC4-2N6F.rev.07
Motor Curves
The relationship between the voltage supplied to a motor and its operating
speed is described by a motor curve. This curve varies with the make and
capacity of the motor. The various motors available in the industry have
been divided into ten categories and the controller has been programmed
with a different motor curve for each of these categories. Select the
appropriate curve to ensure that the controller supplies the correct voltage
to the variable speed fan motors. When the controller is shipped from the
factory, curve number 4 has been selected.
To Select a Motor Curve for Stage 1
In the list of motors enclosed with this user's manual, locate the
make and capacity of your stage 1 variable speed motors and note
the corresponding curve number (1 to 10).
Set the parameter selection knob to BAND WIDTH - STAGE 1. The
stage 1 band width appears flashing on the display.
Press the push-button. The currently selected curve number
appears flashing on the display.
Using the adjustment knob, adjust the curve number to the desired
value.
Return to the stage 1 band width display either by pressing the push-
button once again or by waiting 10 seconds without changing the
position of the adjustment knob.
To Select a Motor Curve for Stage 2
Repeat the steps described above, this time setting the parameter
selection knob to DIFFERENTIAL - STAGE 2.
Outside probe
If the outside probe is defective, the display shows the letter "P" when the
parameter selection knob is set to OUTSIDE SETTINGS and the outside set
point temporarily becomes deactivated ( refer to "Outside Set Point",
page 23). The Defective Probe Pilot Light does not turn on when this happens.

14 TC4-2N6F.rev.07
0.5 F 0.3 C
o o
39
TC4-2N6F.rev.07
Adjusting the Curtain Parameters
TO ADJUST THE CURTAIN TIMER
Set the parameter selection knob to CURTAINS - TIMER.
The word ON and the current time on alternately appear
flashing on the display.
Using the adjustment knob, adjust the time on to the desired
value.
Press the push-button. The word OFF and the current time off
alternately appear flashing on the display.
Using the adjustment knob, adjust the time off to the desired
value.
TO ADJUST THE CURTAIN DEAD BAND
Set the parameter selection knob to CURTAINS - DEAD
BAND. The current curtain dead band appears flashing on
the display.
Using the adjustment knob, adjust the curtain dead band to the
desired value.

38 TC4-2N6F.rev.07
Outside Temperature Compensation
Curtain timer:
During TIME ON, the cur-
tains open or close. Dur-
ing TIME OFF, the cur-
tains stop opening or
closing.
If the outside set point is inactivated:
The curtains operate according to the curtain timer settings. There is no
outside temperature compensation.
If the outside set point is activated:
The controller compensates the curtain timer settings proportionally to the
outside temperature, as described hereafter.
If the outside temperature is above the outside set point:
When the curtains open, the controller increases TIME ON by 5% for
every degree that the outside temperature exceeds the outside set point
and decreases TIME OFF by the same amount.
The higher the outside temperature, the faster the curtains open.
If the outside temperature is below the outside set point:
When the curtains close, the controller increases TIME ON by 5% for
every degree that the outside set point exceeds the outside temperature
and decreases TIME OFF by the same amount.
The lower the outside temperature, the faster the curtains close.
1
2
15
TC4-2N6F.rev.07
Parameter Ranges
PARAMETER ADJUSTMENT RANGE
TEMPERATURE
SET POINT
Minimum speed
Time on
Time off
Band width 0.5° to 20.0°F (0.3° to 11.1°C)
0 to 900 seconds, by increments
of 15 seconds
0 to 900 seconds, by increments
of 15 seconds
10 to 100% of the full speed of
the fans
Outside set point -40.0° to 99.9°F (-40° to 37.7°C)
Room set point -40.0° to 99.9°F (-40° to 37.7°C)
Minimum speed 10 to 100% of the full speed of
the fans
Differential
Time on
0.5° to 20.0°F (0.3° to 11.1°C)
1 to 900 seconds, by increments
of 1 second
STAGE 1 FANS
STAGE 2 FANS
CURTAINS
STAGE 3 & 5 FANS
MIST
HEATERS
Time off 1 to 900 seconds, by increments
of 1 second
Dead band 0.5° to 20.0°F (0.3° to 11.1°C)
Differential 3 and 5 0.5° to 20.0°F (0.3° to 11.1°C)
Offset 1.0° or 2.0°F (0.6° or 1.1°C)
1.0° or 2.0°F (0.6° or 1.1°C)
Differential 0.5° to 20.0°F (0.3° to 11.1°C)
Time on
Time off 0 to 60 minutes, by increments
of 1 minute
Differential
1 to 60 minutes, by increments
of 1 minute

16 TC4-2N6F.rev.07
Factory Settings
The controller is programmed at the factory with the settings shown
below. Keep the settings that are convenient for you and make changes
where necessary.
NOTES: The controller only memorizes the last parameter settings.
Each new setting replaces the preceding one.
If the power supply is cut off, the last parameter setting will
be kept in memory until the power is restored.
(1)
(2)
75.0°F (23.9°C)
60.0°F (15.6°C)
15 seconds
0 seconds
2.0°F (1.1°C)
40 %
2.0°F (1.1°C)
30 seconds
90 seconds
2.0°F (1.1°C)
2.0°F (1.1°C)
2.0°F (1.1°C)
10°F (5.6°C)
2.0°F (1.1°C)
1 minute
15 minutes
PARAMETER FACTORY SETTING
Room set point
Outside set point
Minimum speed
Time on
Time off
Band width
Minimum speed
Differential
STAGE 2 FANS
CURTAINS
Time on
Time off
Dead band
STAGE 3&5 FANS Differential 3 and 5
Differential
Differential
Offset
STAGE 1 FANS
TEMPERATURE
SET POINT
Time on
Time off
MIST
HEATERS
40 %
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TC4-2N6F.rev.07
Curtains
Description of Operation ( Refer to figure 4 below)
When the zone A temperature rises to " room set point + band width 1 +
0.5°F (0.3°C) + differential 2 + differential 3 + curtain dead band" (point 9),
the zone A curtains begin to open according to the curtain timer settings
and continue to do so until fully open if the zone A temperature remains
above this point. When the zone A temperature falls to "room set point +
band width 1 + 0.5°F (0.3°C) + differential 2 + differential 3" (point 10),
the zone A curtains begin to close according to the curtain timer settings
and continue to do so until fully closed if the zone A temperature remains
below this point.
When the zone B temperature rises to " room set point + band width 1 +
0.5°F (0.3°C) + differential 2 + differential 3 + curtain dead band" (point 9),
the zone B curtains begin to open according to the curtain timer settings
and continue to do so until fully open if the zone B temperature remains
above this point. When the zone B temperature falls to "room set point +
band width 1 + 0.5°F (0.3°C) + differential 2 + differential 3" (point 10),
the zone B curtains begin to close according to the curtain timer settings
and continue to do so until fully closed if the zone B temperature remains
below this point.

36 TC4-2N6F.rev.07
Adjusting the Stage 3 and 5 Parameters
TO ADJUST THE STAGE 3 AND 5 DIFFERENTIAL
Set the parameter selection knob to DIFFERENTIAL 3 and 5.
The current differential for stage 3 alternates with the letters
"d - 3" on the display.
Using the adjustment knob, adjust the differential to the desired
value.
Press the push-button. The current differential for stage 5
alternates with the letters "d-5" on the display.
Using the adjustment knob, adjust the differential to the desired
value.
to "room set point + band width 1 + 0.5°F (0.3°C) + differential 2 + differen-
tial 3 + curtain dead band + differential 5 - 1.0°F (0.6°C)" (point 8), the stage
5 fans return to a stop. Note that if differential 5 is smaller than 1.0°F
(0.6°C), the stage 5 fans will stop running when the temperature drops to
"room set point + band width 1 + 0.5°F (0.3°C) + differential 2 + differential
3 + curtain dead band".
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TC4-2N6F.rev.07
The display flashes certain
values and does not flash
others. The flashing indicates
that the displayed value
can be adjusted. A value
that is not flashing can not
be adjusted.
The Meaning of a Flashing Display
Temperature units
Temperatures can be displayed either in
degrees Celsius or in degrees Fahrenheit.
Set switch # 2 to the desired position:
ON to display temperatures in degrees Celsius.
OFF to display temperatures in degrees Fahrenheit.
FACTORY SETTING: When the controller is shipped from the factory,
switch # 2 is set to OFF (temperatures are displayed in degrees Fahrenheit).

18 TC4-2N6F.rev.07
Room Temperature
Set the parameter selection knob to ROOM. The room tem-
perature appears on the display.
Press the push-button. The letter "A" and the zone A tempera-
ture alternately appear on the display.
Press the push-button once again. The letter "B" and the zone
B temperature alternately appear on the display.
Press the push-button once again. The room temperature
again appears on the display.
TO DISPLAY THE ROOM AND ZONE TEMPERATURES
Room Temperature Display
The room temperature is the average value of the temperatures measured
by the two room probes. The zone A temperature is the temperature
measured by the room probe connected to terminal # 1. The zone B
temperature is the temperature measured by the room probe connected to
terminal # 2.
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TC4-2N6F.rev.07
When the room temperature rises to "room set point + band width 1 + 0.5°F
(0.3°C) + differential 2 + differential 3" (point 5), the stage 3 fans start to
run. The controller continues to supply voltage as long as the room tempera-
ture remains above "room set point + band width 1 + 0.5°F (0.3°C) + differ-
ential 2" (point 6). However, a latch switch should cut off power to the stage
3 fans as the zone A or zone B curtains open for natural ventilation. When
the room temperature falls to "room set point + band width 1 + 0.5°F (0.3°C)
+ differential 2" (point 6), the stage 3 fans return to a stop.
When the room temperature rises to "room set point + band width 1 + 0.5°F
(0.3°C) + differential 2 + differential 3 + curtain dead band + differential
5" (point 7), the stage 5 fans start to run. When the room temperature falls
Stage 3 and 5 Fans
Description of Operation ( Refer to figure 3 below)
1.0°F
(0.6°C)

34 TC4-2N6F.rev.07
Set the parameter selection knob to STAGE 2 - DIFFERENTIAL.
The current differential appears flashing on the display.
Using the adjustment knob, adjust the differential to the desired
value.
TO ADJUST THE STAGE 2 MINIMUM SPEED
Set the parameter selection knob to STAGE 2 - MIN.SPEED.
The current minimum speed appears flashing on the display.
Using the adjustment knob, adjust the minimum speed to the
desired value.
Adjusting the Stage 2 Parameters
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TC4-2N6F.rev.07
TO RECALL THE MINIMUM AND MAXIMUM
TEMPERATURES
Set the parameter selection knob to ROOM. The room
temperature appears on the display.
Turn the adjustment knob clockwise by one notch. The minimum
temperature appears flashing on the display.
Turn the adjustment knob clockwise one notch further. The
maximum temperature appears flashing on the display.
Turn the adjustment knob clockwise a third notch. The room
temperature again appears on the display.
If the adjustment knob is turned counterclockwise rather than
clockwise, the display sequence will be reversed (room-
maximum-minimum-room).
Minimum and Maximum Temperature Recall
The minimum and maximum temperatures are the lowest and highest
values of all room temperatures measured since the last reset.
Minimum and Maximum Temperature Reset
The reset erases the current minimum and maximum temperatures. From
the moment the reset is completed, the controller begins to store in memory
the new minimum and maximum temperatures measured by the probes.
TO RESET THE MINIMUM AND MAXIMUM
TEMPERATURES
Set the parameter selection knob to ROOM. The room
temperature appears on the display.

20 TC4-2N6F.rev.07
TO RESET THE MINIMUM AND MAXIMUM
TEMPERATURES (CONTINUED)
Turn the adjustment knob clockwise (or counterclockwise) by
one notch and leave it in this position. The minimum (or
maximum) temperature first appears flashing on the display.
After 10 seconds, the display stops flashing and the room
temperature again appears on the display, indicating that the
reset is completed.
NOTE : To avoid resetting the minimum et maximum temperatures
while recalling them, be sure to return to the room temperature
display within the 10 second delay.
Room Set Point / Temperature Curve
There are two ways to specify the target room temperature:
Adjust the room set point to the desired value and do not activate the
temperature curve. The controller will operate according to this target
room temperature as long as the temperature curve remains deactivated.
Program a temperature curve comprised of six points and activate the
temperature curve. For each of the six points, you must specify a day
number and a room set point for this day number. The controller will
automatically change the target room temperature every hour in a linear
fashion between two consecutive points. When the last point is reached,
the temperature curve becomes deactivated. The controller continues to
operate according to the last room set point until you activate the
temperature curve once again or specify a new room set point. You can
also deactivate the temperature curve before the last point is reached.
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TC4-2N6F.rev.07
Stage 2 Fans
Description of operation ( Refer to figure 2 on next page)
When the room temperature rises to "room set point + band width 1 + 0.5°F
(0.3°C)" (point 3), the stage 2 fans start to run at minimum speed and in-
crease in speed proportionally to the room temperature. When the room
temperature rises to "room set point + band width 1 + 0.5°F (0.3°C) + differ-
ential 2" (point 4), the stage 2 fans reach full speed. Above this temperature,
the controller continues to supply full speed voltage. However, a latch switch
should cut off power to the stage 2 fans as the zone A or zone B curtains
open for natural ventilation.