TAC 200 OTP Heating controller User's Manual

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TAC 200 OTP User’s Manual | Manualzz


Heating controller with outdoor reset


User’s Manual


Controller TAC 200 OTP

TAC 200 OTP is encased in a plastic enclosure with a transparent cover. The controller can be mounted in three ways, either directly on the wall, on a DIN rail or in a panel.

There are cable inlet holes on three sides.

The controller is attached to the base and should be removed as in figure 1. Mount the base plate in an easily accessible position where the display is clearly legible.

Connect the wires according to the wiring diagram. Screw the controller back onto the base plate. There are holes in the base plate for mounting the controller directly onto the wall if preferred.

To mount the controller on a DIN rail, see figure 2, place the controller on the upper edge of the rail and press it inwards to snap it into place. To remove it again, place a screw driver in the red piece of plastic on the lower part of the controller, pull downwards and then pull the controller upwards from the rail.

To mount the controller in a panel the space needs to be

138×92 mm. Place the controller in the panel and turn the small plastic hooks in the controller’s screw holes to secure it.

Outdoor sensor EGU

Mount the sensor on an external wall, facing north or northwest. The sensor should be placed about 3 m above ground level and the cable inlet should face downwards.

Supply sensor EGWS/EGA

The immersion sensor EGWS is mounted in the riser pipe, some 0,5–1 m downstream of the mixing valve. If an EGA strap-on sensor is used, it should be mounted on an uninsulated part of the pipe. Clean the pipe thoroughly so that the copper contact plate of the sensor makes good contact with the pipe.

Room sensor EGRL

To achieve the best performance, the following should be taken into consideration when mounting the room sensor:

• The sensor should be installed in a room which is typical of the building.

• The sensor should be placed on an inner wall of light building material. The wall must not beheated by, for example, uninsulated heating pipes behind it.

• The room should be of sufficient size for the temperature not to be adversely affected by people or machinery.

• The radiators in the room should not have thermostat valves. If they have they should be turned to the largest value possible.

• The room sensor should be placed so that the air can flow freely around it.

• The room sensor should be placed within 10 m from the nearest radiator, but not right above it.

Base plate

DIN rail

TAC 200OTP Cover

Figure 1

Figure 2


Connect the cables to the controller according to the wiring diagram, see figure 3 on the next page. The wires from the controller are connected between inputs 1 and 2 on the room sensor.

Length of cables

To terminals B1–B3, and X1–X3: Max. 200 m, area 0,5 mm 2 .

To other terminals: Max. 100 m, area 1,5 mm 2 .

Actuator (M44, M5, M15, M42)

Mounting instructions are supplied with the actuator/ mounting kit.

0FL-3563-000, 2000-01 1 (4)

230 V/L

230 V/N





(230 V)


230 V/L

230 V/N



1 L

2 N

3 PE

4 KC1

5 K1

6 K2

7 KC2

8 K3

9 K4

M 10

B1 11

B2 12

B3 13

M 14

X1 15

X2 16

X3 17

M 18

Stage 1

Stage 2



1 L

2 N

3 PE

4 KC1

5 K1

6 K2

7 KC2

8 K3

9 K4

Supply temp. sensor

Outdoor sensor

Room sensor

Forced day op.

Forced night op.

3. Switch on power.

4. Set current time and date, see the next page.

5. Put the brief instruction back in its place.

TAC 200 OTP will now control, using the factory settings. To set values other than those set at the factory, refer to the

TAC 200 OTP Handbook, part number 0-004-1400.

Brief instruction Display





TAC 200

DIP switches Buttons

Figure 4

Terminal board connections










230 V/L Mains, phase (live)

230 V/N Mains, neutral








Protective earth

Power supply, relays K1 and K2

Relay K1: increase/stage 1

Relay K2: decrease/stage 2

Power supply, relays K3 and K4

Relay K3: circulating pump

Relay K4: boiler

1 2 3 4 5 6 7 8 on (1) off (0)

Factory setting, 1–8: 1000 000 Figure 5



















Measurement neutral

Supply sensor, EGWS/EGA

Outdoor sensor, EGU

Room sensor, EGRL

Measurement neutral

Input, forced day operation

Input, forced night operation

Not in use

Measurement neutral

Figure 3


After the controller has been mounted and the electrical wiring is completed, the following checks should be carried out and the settings entered before operation of the installation.

1. Check that sensors and actuators are correctly wired.

2. Set the switches on the DIP switches on the circuit board, located under the brief instruction, as required, see figure 4 and 5.

Operator’s panel

P:nn in the display indicates the current function used, see figure 6. P:00, for example, means time of day and operating mode.

P P Use these buttons to move up and down the list.

+ – Use these buttons to increase or decrease the value shown on the display. Keep either of them depressed to increase the stepping speed.

/ Use this button to change between day and night in segments of 30 minutes.

To save alterations, press P or P again. Failure to carry out this step will result in the changes not being saved and the controller reverting to the old value in approximately two minutes.

7 8 9 10 11 12 13 14 15 16 17









Position off (0) on/off control radiator system

Position on (I) mixing valve floor heating room sensor no room sensor installed

(no function)

(hardware reset when switched 0–1–0)




















Figure 6

Switches 4–8 should be in the off position.

2 (4) 0FL-3563-000, 2000-01

Setting time and date

1. Press P or P , until P:13 (Set time) is displayed.

2. Press either + or – until the controller shows current time, e.g. 09:45. Keeping the button depressed increases the stepping speed.

3. Press P , so that P:14 (Day.Month) is displayed.

4. Press + or – until the controller shows current date e.g. 29.11.

5. Press P so that P:15 (Year) is displayed.

6. Press + or – until the controller shows current year, e.g. 1994.

7. Press P so that P:00 (Time) is displayed. The time value is now stored.

If P or P is not pressed as the last step, any changes will not be stored (applies to all entries). In this case the display will automatically revert to P:00 in about two minutes.

Note! TAC 200 OTP automatically switches to and from daylight saving time, even in leap years. The dates for change over can be set manually if desired.

Current temperatures

1. Press P or P , to display P:01, P:02, P:03 or P:04.

Function displays current



P:03 room temperature (if a room sensor is installed) outdoor temperature supply water temperature

P:04 supply water temperature setpoint

2. The current value is continually updated, but after about two minutes the display reverts to P:00 (Time/Operating mode).

Setting temperature setpoint

1. Press P or P to display P:05, P:06 or P:07.

Function displays


P:06 room temperature setpoint (°C) (with room sensor) night setback (°C) (with room sensor)

P:07 parallel shift of reset curve (°C) (without room sensor).

2. Press + or – until the display shows desired value.

Keeping the button depressed increases the stepping speed.

3. Store changes by pressing P or P at least once.

Setting time program

The digital clock has a time program, which is used for switching between day and night temperature. All times can be set individually for every day of the week, with a resolution of 30 minutes. The segments—each is 30 minutes long—on the 0–24 scale show when day and night temperature are used, starting with Monday (MO displayed). A black segment denotes day temperature setpoint and a white one night.

1. Press P or P until P:08 (Time program, day-by-day) is displayed.

2. Press + or – until you reach the segment you want to change. The segment flashes.

3. Press / . The colour of the segment changes and the flashing skips to the next segment.

4. If you press + , and you are at the last segment, the display changes to the following day. If you are in the first segment and press – , the display changes to the previous day.

5. Mark all the segments of all day-and-night periods as desired.

6. Use the same procedure to mark the segments for each day of the week.

7. Store the changes by pressing P or P at least once.

If the same pattern for day/night setpoint is required for several days, either repeat the above or, for speed, use P:09

(Time program, 1–7 days). The days of the week and the

0–24 segments can then be changed in the same procedure.

1. Press P or P until P:09 (Time program, 1–7 days) is displayed.

2. Press + or – until the first day to be removed flashes.

3. Press / . The marked day disappears.

4. Remove all the days for which the change should not apply in the same way. Make sure that the days to which the changes apply, are visible on the display.

5. The flashing weekday indication will automatically skip to the segments of 30 minutes when passing either Sunday or Monday (in reverse direction).

6. When day setpoint is required, mark the segments in the same way as above.

7. Press


or P to save the changes.

8. To set other times for other days, return to P:09 and repeat steps 2–7 for these days.

Note! Take care as this operation changes several days at the same time.

0FL-3563-000, 2000-01 3 (4)

To change operating mode

The temperature of the building can be lowered for a longer period of time, e.g. if it is empty during a holiday, or if the day temperature is required for a couple of hours extra one night, without changing the TAC 200 OTP program. The controller can also provide day or night temperature all the time or be turned off without losing the settings.

It is possible to toggle between the following operating modes on the operator’s panel:

Power failure

The controller maintains the settings for at least twelve hours during a power failure. The clock keeps running and when the power returns, the controller continues to control the system as if nothing had happened. Should the power failure last longer than twelve hours, the time, date and year will require re-setting.

Forced off

Forced night operation


If the controller has stopped working, it may need to be restarted. To do this switch DIP switch 8, behind the brief instruction on the front of the controller, to on and then back to off. All the settings remain in the controller.

Automatic operation (control by the time program)

Forced day operation

To restart the controller and regain the factory settings:

1 Press P and P to reach P:16.

2 Press P or P until P:54 is shown on the display.

3 Press + .

During forced off, the controller is turned off without loosing the settings.

During forced night operation the controller provides night temperature all the time. In the same way, the controller provides day temperature all the time during forced day operation.

During automatic operation, the controller provides day and night temperature according to the programmed settings.

To change the operating mode:

1. Press P or P until P:00 (Operating mode) is displayed (if it is not already shown).

2. Press + or – until the desired symbol is activated.

If forced day or night operation has been activated from outside the controller (Extended day/night operation, see the handbook), the corresponding symbol flashes.

Externally forced operation (X1, X2) has a higher priority than any locally forced operation.


TAC 200 OTP Handbook, part number 0-004-1400.

To access other functions

Normally it is sufficient to use P:00–P:15 and for this reason the display scrolls through P:15–P:00 or vice versa.

To access functions P:16 and higher:

1. Simultaneously press P and P to get to P:16.

2. Press P or P to step up or down within the new interval. To return to P:00–P:15, either press P and P simultaneously, or wait for approximately two minutes for the controller to return to P:00 automatically.

Depending on the specific configuration, certain non-relevant functions may be missing.

4 (4) English

TAC AB, Jägershillgatan 18, SE-213 75 MALMÖ, SWEDEN, +46 40 38 68 50 (vx)

0FL-3563-000, 2000-01


Key Features

  • Outdoor reset
  • Time program
  • Flexible mounting options
  • Room sensor

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Frequently Answers and Questions

How do I mount the TAC 200 OTP?
The controller can be mounted directly on the wall, on a DIN rail, or in a panel. Refer to the manual for detailed instructions on each mounting method.
Where should I install the room sensor?
The room sensor should be placed in a room typical of the building, on an inner wall of light building material. It should be away from direct heat sources and placed so that air can flow freely around it. The manual provides more specific guidelines.
What are the cable length limits?
The maximum cable length for terminals B1-B3 and X1-X3 is 200 meters with a 0.5 mm² area. For other terminals, the maximum is 100 meters with a 1.5 mm² area.
How do I change the operating mode?
You can toggle between different operating modes on the operator’s panel: Forced Off, Forced Night, Forced Day, and Automatic. Refer to the manual for a detailed explanation of each mode.
What happens to the settings during a power failure?
The controller maintains the settings for at least twelve hours during a power failure. The clock keeps running, and when power returns, it continues controlling the system. However, if the power failure lasts longer than twelve hours, you will need to reset the time, date, and year.
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