Sentiotec Pro B2 User manual

Version 12/13 ID no. 50950096
EN
INSTRUCTIONS FOR INSTALLATION AND USE
English
Sauna control unit
Pro B2
PRO-B2

WORLD OF WELLNESS
Table of Contents
1. About this instruction manual 4
2. Important information for your safety 5
2.1. Intended use 5
2.2. Safety information for the installer 5
2.3. Safety information for the user 6
3. Product description 8
3.1. Scope of delivery 8
3.2. Optional accessories 8
3.3. Product functions 8
3.4. Sensor operating modes 9
4. Installation 10
4.1. Installing the sauna control unit 10
4.2. Installing the heater sensor F1 with excess temperature fuse 12
4.3. Installing bench sensor F2 (optional) 15
5. Electrical connection 16
5.1. Connecting the power supply cable and heater cable 17
5.2. Connecting the light 17
5.3. Connecting the power booster (optional) 18
5.4. Connecting heater sensor F1 18
5.5. Installing bench sensor F2 (optional) 18
5.6. Connecting the safety shut-off device 18
5.7. Remote start 19
5.8. Finishing installation 19
6. Performing tests 20
7. Connection diagram 22

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EN
8. Starting-up 23
8.1. Setting the heating period limit 23
8.2. Activating/deactivating phase alignment 24
8.3. Activating/deactivating the remote start and preset time function 24
8.4. Activating/deactivating the single-sensor mode 25
8.5. Displaying the heater temperature in single-sensor mode 25
9. Operation 26
9.1. Operating elements 26
9.2. Switching on the light 26
9.3. Switching on the sauna control unit 27
9.4. Starting the sauna 27
9.5. Changing the preset temperature 28
9.6. Setting the preset time 28
9.7. Cancelling the preset time function 29
9.8. Switching off the sauna control unit 29
10. Cleaning and maintenance 30
10.1. Cleaning 30
10.2. Maintenance 30
11. Disposal 30
12. Troubleshooting 31
13. Technical data 32

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Instructions for installation and use p. 4/30
1. About this instruction manual
Read these instructions for installation and use carefully and keep them within
reach of the sauna control unit. This ensures that you can refer to information
regarding your safety and regarding operation at any time.
Symbols used for warning notices
In these instructions for installation and use, a warning notice located next to
an activity indicates that this activity poses a risk. Always observe the warning
notices. This prevents damage to property and injuries which could in the worst
case even be fatal.
The warning notices contain keywords, which have the following meanings:
DANGER!
Serious or fatal injury will occur if this warning notice is not observed.
WARNING!
Serious or fatal injury can occur if this warning notice is not observed.
CAUTION!
Minor injuries can occur if this warning notice is not observed.
ATTENTION!
This keyword is a warning that damage to property can occur.
Other symbols
This symbol indicates tips and useful information.
These instructions for installation and use can also be found in the down-
loads section of our website: www.sentiotec.com.

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EN
Instructions for installation and use p. 5/30
2. Important information for your safety
The sauna control unit Pro B2 has been produced in accordance
with the applicable safety regulations for technical units. However,
hazards may occur during use. Therefore adhere to the following

chapters. Also observe the safety information for the devices con-
nected.
2.1. Intended use
The sauna control unit Pro B2 is used exclusively for operating and
controlling the sauna functions in accordance with the technical data.
The sauna control unit Pro B2 may only be used for operating and

combustion test described in paragraph 19.101 of EN 60335-2-53.
Alternatively, a suitable safety shut-off device can be installed in or
above the heater.
The sauna control unit Pro B2 may only be used for operating and
controlling 3 heating circuits with a maximum heating capacity of
3.5 kW per heating circuit.
Any use exceeding this scope is considered improper use. Improper
use can result in damage to the product, in severe injuries or death.
2.2. Safety information for the installer


Work on the sauna control unit may only be performed when the
power has been disconnected.

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Instructions for installation and use p. 6/30
A three-phase shut-off device with a 3 mm contact opening must
be provided during installation. This is provided by the fuse.
The sauna control unit must be installed outside the sauna room
at a height of approx. 1.70 m or in accordance with the rec-
ommendation issued by the sauna manufacturer. The ambient
temperature must be within a range spanning -10 °C to +40 °C.
The heater sensor must be attached in a way that it is not af-

The heater supply cable must have a minimum cross-section of
2.5 mm2and be temperature resistant up to 150 °C.
Also comply with the regulations applicable at the installation
location.
For your own safety, consult your supplier in the event of prob-

instructions.
2.3. Safety information for the user
The sauna control unit must not be used by children under
8 years old.
The sauna control unit may only be used by children above 8 years
old, by persons with limited psychological, sensory or mental
capabilities or by persons with lack of experience/knowledge:
– When they are supervised.
– When they have been shown how to use the device safely
and are aware of the hazards that could occur.
Children must not play with the sauna control unit.
Children under 14 years of age may only clean the sauna control
unit if they are supervised.

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Instructions for installation and use p. 7/30
 
ence of alcohol, medication or drugs.
 
sauna heater before the sauna control unit is switched on.
 
heater before activating the preset time function or the stand-by
mode for the remote start.
For your own safety, consult your supplier in the event of prob-

instructions.

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Instructions for installation and use p. 8/30
3. Product description
3.1. Scope of delivery
Sauna control unit
Heater sensor with integrated excess temperature fuse
Sensor wires
Installation material
3.2. Optional accessories
Bench sensor (item number: O-F2)
Power booster (item number: O-S2-18/O-S2-30)
Safety shut-off (item number: HT-SWL)
3.3. Product functions
The sauna control unit Pro B2 features the following functions:
Regulation of sauna heaters with a heating output of up to 10.5 kW in the
temperature range spanning 30 °C to 110 °C.
A power booster allows the maximum contact rating to be increased from
10.5 kW to 18 kW or 30 kW.
Remote start function
Preset time function (up to 24 hours)
Automatic heating period limiter
The sauna control unit shuts down automatically after the maximum heating
period for safety reasons. The maximum heating period can be set to 6 h,
12 h, 18 h or 24 h.
Excess temperature fuse
The excess temperature fuse is installed in the housing for the heater sen-
sor. Should the sauna heater continue heating after reaching the preferred
temperature due to a defect, the excess temperature fuse switches the sauna
heater off at a temperature of approx. 139 °C.

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Instructions for installation and use p. 9/30
3.4. Sensor operating modes
The sauna control unit can be operated with one or two temperature sensors.
Single-sensor mode (F1)

time (see 8.4. Activating/deactivating the single-sensor mode on page 23).
In single-sensor mode, the sauna control unit is operated with the heater sensor
with an excess temperature fuse (F1) only. In single-sensor mode, the sauna
control unit only displays the set temperature. The actual temperature is not dis-
played. Should the sauna control unit display the temperature above the heater
(F1) as an actual temperature in single-sensor mode, it must be activated when
8.5. Displaying the heater temperature in
single-sensor mode on page 23)
Two-sensor mode with bench sensor (F2)
In two-sensor mode with bench sensor, a second temperature sensor (bench
sensor) is installed above the rear sauna bench. The sauna control unit displays
the temperature measured by the bench sensor as the actual temperature.

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4. Installation
4.1. Installing the sauna control unit
Observe the following points when installing the sauna control unit:
The sauna control unit must be installed outside the sauna room or in accord-
ance with the recommendation issued by the sauna manufacturer.
The ambient temperature must be within a range spanning -10 °C to +40 °C.
The sensors may only be connected using the sensor wires provided with the
unit, which are heat-resistant up to 150 °C.
ATTENTION!
Damage to the unit
The sauna control unit is protected against jets of water, however direct contact
with water could still damage the unit.
Install the sauna control unit in a dry place at which a maximum humidity of
95% is not exceeded.
The sensor wires may be extended under the following conditions:
When a silicon wire resistant to temperatures up to 150 °C is used.
The minimum cross-section of the wire totals 0.75 mm2.
The length of the heater sensor wires may NOT exceed 10 m.
ATTENTION!
Sources of interference can have a negative effect on signal transmission
Lay all sensor wires separately from other mains wires and control wires.
Protect wires with only one layer of insulation by using a pipe (double insulation).

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Installation instructions, only for experts p. 11/30
82
80
34
175
145
34
43
40
Fig. 1 Position of the attachment device and the installation holes
(dimensions in mm)
C
To install the sauna control unit, perform the following steps:
1. Screw two Phillips-head screws (16 mm) into the wall of the sauna at a height
of approx. 1.70 m to a distance of up to 7 mm. The two screws must be
placed at a distance of 145 mm from each other (see Fig. 1).
2. Press the clip locks Cin lightly using a screwdriver and remove the cover
from the housing (see Fig. 2).
3. Fasten the sauna control unit onto the Phillips-head screws using the at-
tachment device Aas an aid (see Fig. 1).
4. Screw two Phillips-head screws (16 mm) into the lower fastening holes B
(see Fig. 1).
A
B
Fig. 2 Removing the cover from the housing

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4.2. Installing the heater sensor F1 with excess
temperature fuse
Observe the following points when installing the heater sensor:
The heater sensor must be installed on the rear of the heater, above the mid-
dle of the sauna heater. An interval of approx. 15 cm to the roof of the sauna
room must be maintained.
 
of air.
To install the heater sensor, perform the following steps (see Fig. 3):
1. Lay the two 2-pin heater sensor wires in the wall of the sauna room, leading

wires using wire clips.
2. Pull the two half-shells 1of the heater sensor apart.
3. Connect the four connectors for the heater sensor wire 5in accordance
with the Fig. 3.
4. Place the connection panel 2crossways (as shown in Fig. 3) in the heater
sensor half-shells.
5. Place the two half-shells together, screw them together using the two Phillips-
head screws 3(9 mm) and check whether the heater sensor has been
securely closed.
6. Install the heater sensor on the rear of the heater using the two wood screws
enclosed 6(16 mm).
1Heater sensor half-shells
2Connection panel
3Phillips-head screws (9 mm)
4Heater sensor
5Heater sensor wires
6Wood screws (16 mm)
Fig. 3 Installing the
heater sensor
red white white red

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4.3. Installing bench sensor F2 (optional)
The bench sensor must be installed on the wall of the sauna room, above the
rear bench seat. An interval of approx. 15 cm to the roof of the sauna room must
be maintained.
To install the bench sensor, perform the following steps:
1. Lay the two 2-pin bench sensor wires in the wall of the sauna room, leading

wires using wire clips.
2. Pull the two half-shells of the bench sensor apart.
3. Connect the two connectors for the bench sensor wire to the two middle
terminals on the connection panel.
4. Place the connection panel crossways in the bench sensor half-shells.
5. Place the two half-shells together and screw them together using the two
Phillips-head screws (9 mm).
6. Check whether the bench sensor has been securely closed.
7. Install the bench sensor on the wall of the sauna room using the two wood
screws enclosed (16 mm). Maintain an interval of 15 cm to the roof of the
sauna room.

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5. Electrical connection
ATTENTION!
Damage to the unit
The sauna control unit may only be used for operating and controlling 3 heat-
ing circuits with a maximum heating capacity of 3.5 kW per heating circuit.
1
2
4
3
5
6
b
7
8
9
a
c
d
e
f
1Low-voltage connection area
2Terminal strips for safety shut-off device,
remote start and sensor wires
3Function selection switch
4Cable bushing for F2 sensor
5Cable bushing for F1 sensor
6Cable bushing for safety shut-off device
and remote start
7Cable bushing (leave free)
8Cable bushing for heater wire
9Cable bushing for power supply cable
aCable bushing for power booster
bCable bushing for light
cTerminal strip for heater and power supply cable
dTerminal strip light
eTerminal strip for power booster
fConnection area for 230 V / 400 V
g Earth rail
g

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Observe the following points when connecting the power to the sauna control unit:


Please observe that in the event of a guarantee claim, a copy of the bill
from the electrician performing the work must be presented.
Work on the sauna control unit may only be performed when the power has
been disconnected.
 
A three-phase shut-off device with a 3 mm contact opening must be provided
during installation. This is provided by the fuse.
Observe the connection diagram (Fig. 4) on page 20.
5.1. Connecting the power supply cable and heater cable
1. Guide the power supply and heater cable through the cable bushings 9
and 8into the connection area for 230 V/400 V f.
2. Connect the power supply cables to the terminal strip cin accordance
with the connection diagram. Observe the operating instructions for the
respective devices.
5.2. Connecting the light
1. Guide the light cable through the cable bushing binto the connection area
for 230 V/400 V f.
2. Connect the light cable to the terminal strip din accordance with the con-
nection diagram. Observe the operating instructions for the respective device.

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5.3. Connecting the power booster (optional)
1. Guide the cable for the power booster through the cable bushing ainto
the connection area for 230 V/400 V g.
2. Connect the cable for the power booster to the terminal strip ein
accordance with the connection diagram. To do so, use terminal
“ST1
” for the safety circuit, and terminal “ST2 ” for the control circuit.
Observe the operating instructions for the respective device.
5.4. Connecting heater sensor F1
1. Guide the wires for the heater sensor through the cable bushing 5into the
low-voltage connection area 1.
2. Connect the red wires for the heater sensor to the terminals labelled “STB”
in terminal strip 2.
3. Connect the white wires for the heater sensor to the terminals labelled “F1”
in terminal strip 2.
5.5. Installing bench sensor F2 (optional)
1. Guide the wires for the bench sensor through the cable bushing 4into the
low-voltage connection area 1.
2. Connect the wires for the bench sensor to the terminals labelled “F2” in
terminal strip 2.
5.6. Connecting the safety shut-off device
EN 60335-2-53 states that sauna control units with a remote start or preset timer
function may only be used for operating and regulating a sauna heater which

a suitable safety shut-off device can be installed in or above the heater. This shuts
the sauna heater off when objects, e.g. a towel, are placed on the sauna heater.

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To install the safety shut-off device, perform the following steps:
1. Install the safety shut-off device in accordance with the operating instruc-
tions for the device.
2. Guide the wires for the safety shut-off device through the cable bushing 6
into the low-voltage connection area 1.
3. Connect the wires to the terminals labelled “OSG” in terminal strip 2.
5.7. Remote start
This is connected using terminals “S”, “B” and “C”. “S” stands for sauna mode.
“B” is a +24 V DC output. This must be activated using a switch or an actuator
on terminal “S”.
5.8. Finishing installation
1. Connect the earth conductor for the power supply cable and all devices to
the earth rail g.
2. Place the cover of the housing on the upper edge of the junction box.
3. Push the clip locks inwards lightly, and turn the cover of the housing down-
wards until it engages audibly.

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6. Performing tests

WARNING!
The following tests must be performed with the power supply
switched on. There is a danger of electric shock.
NEVER touch live parts.
1. Check the contact of the earth conductors on the earth conductor terminal.
2. Check the excess temperature fuse on the heater sensor F1.
a. Switch on the sauna control unit.
b. Open the heater sensor and disconnect one of the two red wires for
the heater sensor.
“Err” shows in the top display, “02” shows in the bottom display, and
the control unit switches off the heater.
c. Switch off the sauna control unit.
d. Reconnect the red wire for the heater sensor.
e. Now disconnect one of the white wires for the heater sensor.
f. Switch on the sauna control unit.
“Err” shows in the top display, “04F1” shows in the bottom display
and the control unit switches off the heater.
g. Switch off the sauna control unit.
h. Reconnect the white wire for the heater sensor.
3. Check the phase circuit for sauna mode L1, L2, L3 is connected to U, V, W.
4. Check the maximum permissible heating output of 3.5 kW per phase on the
sauna control unit.

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EN
Installation instructions, only for experts p. 19/30
5. When there is an optional power booster:
a. Check the control wires ST1, ST2 and ST3.
b. Check the maximum permissible heating output of 3 kW per phase on
the power booster S2-18.
c. Check the maximum permissible heating output of 7 kW per phase on
the power booster S2-18.

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Fig. 4 Connection diagram
7. Connection diagram
139 °C
1
23
4
5
6
7 8
1Remote start
2 Heating system (max. 10.5 kW)
3Sauna control unit power supply
4 Power booster
5 Light
6Earth rail
7Heater sensor with excess temperature fuse (F1)
8 Bench sensor (F2)