Honeywell TFU 22 Installation And Operating Instructions Manual

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The TFU 22 remote controller measures the room temperature
and transfers the measured values to the heating system con­troller.
The operating mode keys allow you to select the operating mode
and timer program and to activate and deactivate the lock.
By means of the regulator wheel, you can adjust the set desired

temperature by ± 7 °C and also the time settings in order to
adjust the timer program to your needs.

The TFU 22 is compatible with the following control systems:

• MCR 35, 36, 200

• DHC 23

• Excel 500

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Figure 1: Installation

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1. Place a screwdriver in the recess at the base of the housing.

2. Carefully pull the opening strap outwards.

3. Remove the housing cover upwards.

Figure 2: Removing of housing cover

4. Screw remote controller onto the wall.

Figure 3: Drill holes and housing dimensions

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– Connect the cable coming from the controller.

Figure 4: Wiring diagram

Wiring of the terminals:

1 GND 4 not used
2 Room sensor 5 + 10 V
3 Desired value 6 not used

Connection to MCR 200-45

For other controllers, please refer to the respective controller
instructions.

Connection to MCR 36

Connection to DHC 23 or MCR 35

Connection to Excel 500

XF 521 A analog input module
Desired temperature to AI 1

Room temperature sensor to AI 2

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– Return cover to housing by placing top edge against back-

plate and snap lower part of cover onto housing.

Figure 5: Returning cover to housing

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Figure 6: Operating devices and indicators

(1) Display
(2) Button for day operation
(3) Button for automatic mode Auto
(4) Button for switch-off mode
(5) Regulator wheel

The TFU 22 remote controller is equipped with 3 operating
modes:

• Automatic mode:
The room temperature is regulated according to the control
program of the heating system controller. By means of the
regulator wheel, the desired temperature can be adjusted by

±7 °C.

• Daytime mode:
The room temperature is maintained continuously or for a
limited period only at the desired daytime temperature.
Adjustments of the desired temperature in automatic mode
are effective.

• Switch-off mode:
The heating period is limited or the heating is switched off.
The frost protection remains activated.

Note

The warm water program of the heating system con­troller is not affected by the selected operating mode.
For MCR 200, the desired daytime temperature code is
107 and the desired nighttime temperature code is 108.

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Note

The desired temperature can only be adjusted in auto­matic mode.

1. If the TFU 22 is not in automatic mode,
press the Auto button.
The display reads as follows:

2. Turn the regulator wheel clockwise to increase the desired
temperature. Turn the regulator wheel anti-clockwise to
lower the desired temperature.

Note

The adjusted desired temperature is applied in daytime
mode.

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1. Press the Auto button.
The display reads as follows:

The TFU 22 is now set to automatic mode.

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1. Press the button.
The display reads as follows:

2. Turn the regulator wheel to adjust the time period. The time
period can be set to intervals of 1–23 hours or 1– 99 days.

For the selected time period, the room temperature is main­tained at the desired daytime temperature. After the lapse of the
selected period, the TFU 22 returns to automatic mode.

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1. Press the button twice.
The display reads as follows:

The room temperature is maintained at the desired daytime
temperature until a different operating mode is selected.

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1. Press the button.
The display reads as follows:

2. Turn the regulator wheel to select the time period. The time
period can be set to intervals of 1–23 hours or 1– 99 days.

The heating will be switched off for the selected period of time.
After the lapse of the period, the TFU 22 returns to automatic
mode.

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1. Press the button twice.
The display reads as follows:

The heating remains switched off until a different operating
mode is selected. In the event of danger of frost, the heating
pump and the burner are automatically switched on.

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Activating lock mode:

1. Simultaneously press the

and the Auto buttons for at
least 2 seconds.
The display reads as follows:

As soon as you release the buttons, the display shows the
previously selected operating mode.

The TFU 22 is now locked and protected against accidental
operation. As soon as the operating mode button or the regula­tor wheel are activated, the message

is displayed.

Deactivating lock mode:

1. Simultaneously press the and the Auto button for at least
2 seconds.
The display reads as follows:

As soon as you release the buttons, the display shows the
previously selected operating mode.
The lock is now deactivated.

Note

The lock mode can be activated/deactivated in any op­erating mode.

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Sensor element: NTC thermistor
Resistance: 20 kOhm at 25 °C
Temperature range: –15...+40 °C
Dimensions (H×W×D): 103 × 98 × 28 mm
Installation: Installation on wall
Max. ambient
temperature / humidity: 0...50 °C / 5...95 %
Max. storage temperature /
humidity: –35...+70 °C / 5...95 %
Electric connection: Terminals for max. 1.0 mm

2

wire diameter

Protection class: IP 30, DIN 40 050

or IEC 144

Timer programs: 1 × daytime mode, limited period

1 × switch-off mode, limited period
Time range: 1 hour (h) to 99 days (d)
Time intervals: 1...23 hours (h) at intervals of 1 hour

1...99 days (d) at intervals of 1 day

For technical information on NTC thermistor:
see publication GE 3R-1106.

Centra Regelungstechnik

Honeywell AG
Böblinger Strasse 17
D-71101 Schönaich
Telephone: ++49 (0)7031 637 01
Fax: ++49 (0)7031 637 574
http://www.honeywell.de/hga

Subject to change

Company

certified

This document replaces all previously issued instructions and is
only applicable to the product with which it is supplied.

.

No. 7157353 EN1H-155 GE51R0100