Sentiotec Pro B2 User manual

Version 09/23 Ident no 1-026-967
INSTRUCTIONS FOR INSTALLATION AND USE
English
EN
DE
FR
IT
NL
SV
FI
Sauna control unit
PRO B2 / PRO B3
PRO-B3 / 1-015-457
PRO-B2 / 1-015-455

Table of Contents
1. About this instruction manual 5
2. Important information for your safety 6
2.1. Intended use 6
2.2. Safety information for the installer 7
2.3. Safety information for the user 8
3. Product description 9
3.1. Scope of delivery 9
3.2. Optional accessories 9
3.3. Product features 9
3.4. Sauna operating modes 10
3.5. Sensor operating modes 11
4. Installation 13
4.1. Installing the sauna control unit 13
4.2. Installing the heater sensor F1 with overheat cut-out 15
4.3. Installing the bench sensor F2 (optional) 16
4.4. Installing the humidity/temperature sensor FTS2
(optional, PRO B3 only) 16
5. Electrical connection 17
5.1. Connecting the power supply cable, heater and vaporizer 18
5.2. Connecting the light 18
5.3. Connecting a fan (optional, PRO B3 only) 18
5.4. Connecting a power booster (optional) 19
5.5. Connecting the heater sensor F1 19
5.6. Connecting the bench sensor F2 (optional) 19
5.7. Connecting the humidity/temperature sensor FTS2 (optional, PRO
B3 only) 19
 󰀨 20
5.9. Remote start 20
5.10. Finishing the installation 20

EN
6. Testing 21
7. Connection diagram 22
8. Commissioning 24
8.1. Setting the function selection switch 24
8.2. Setting the heating time limit 24
8.3. Activating/deactivating phase alignment 25
8.4. Remote start release 25
8.5. Activating/deactivating the single-sensor mode 25
8.6. Activating vaporizer single mode (PRO B3 only) 25
8.7. Displaying the heater temperature in single-sensor mode 26
8.8. Settings in the technician menu 26
9. Operation 27
9.1. Controls for PRO B2 27
9.2. Controls for PRO B3 28
9.3. Switching on the light 28
9.4. Switching on the sauna control unit 29
9.5. Starting sauna mode 29
9.6. Starting Combi mode (PRO B3 only) 30
9.7. Activating standby for remote operation 31
9.8. Setting the preset time 32
9.9. Cancelling the preset time function 33
9.10. Cancelling the post-drying program (PRO B3 only) 33
 󰀨 33
 󰀨 33

10.Cleaning and maintenance 34
10.1. Cleaning 34
10.2. Maintenance 34
11.Disposal 34
12.Troubleshooting 35
12.1. Error messages 35
12.2. Low-water display (PRO B3 only) 36
12.3. Fuses 36
13.Technical data 37

EN
Instructions for installation and use p. 5/38
1.About this instruction manual
Read these installation and operating instructions carefully and keep them within
reach of the sauna control unit. This ensures that you can refer to information on
safety and 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 in the worst case
may 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 installation and operating instructions can also be found in the
downloads section of our website: www.sentiotec.com/downloads.

Instructions for installation and use p. 6/38
2.Important information for your safety
The PRO B2 / PRO B3 sauna control unit has been manufactured
in accordance with the applicable safety regulations. However,
hazards may arise during use. Therefore adhere to the following
-
ual chapters. Also observe the safety information for the devices
connected.
2.1. Intended use
The PRO B2 / PRO B3 sauna control unit is used exclusively for
operating and controlling the sauna functions in accordance with
the technical data.
The PRO B2 / PRO B3 sauna control unit may only be used for

as satisfying the combustion test described in paragraph 19.101
of EN 60335-2-53. If the heater does not meet this requirement,
an appropriate safety precaution must be taken (for example: Con-
󰀨5.8 on page 20).
The PRO B2 / PRO B3 sauna control unit may only be used for
operating and controlling 3 heating circuits with a maximum heating
output of 3.5 kW per heating circuit. The maximum vaporizer output
(PRO B3 only) is 3.5 kW.
Any use exceeding this scope is considered improper use. Improper
use can result in damage to the product, severe injuries or death.

EN
Instructions for installation and use p. 7/38
2.2. Safety information for the installer


Work on the sauna control unit may only be performed when the
power has been disconnected.
A fully disconnecting all-pole isolating device compliant with

The sauna control unit must be installed outside the sauna cabin
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 installed in such a way that it is not
󰀨
The heater supply cable must have a minimum cross-sectional
area 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.

Instructions for installation and use p. 8/38
2.3. Safety information for the user
The sauna control unit must not be used by children under 8 years
of age.
The sauna control unit may be used by children over 8 years of
age, by persons with limited psychological, sensory or mental
capabilities or by persons with lack of experience/knowledge,
but only if:
– They are supervised.
– 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.
 -
ence of alcohol, medication or drugs.
 
sauna heater before the sauna control unit is switched on.
 
sauna heater before activating the preset time function or the
standby mode for remote start.
For your own safety, consult your supplier in the event of prob-
󰀩
instructions.

EN
Instructions for installation and use p. 9/38
3.Product description
3.1. Scope of delivery
Sauna control unit (depending on version PRO B2 / PRO B3)
Heater sensor with integrated overheat cut-out
Installation material
3.2. Optional accessories
Bench sensor (1-009-231 / O-F2)
Humidity/temperature sensor (1-010-081 / O-FTS2)
Foil sensor (1-014-445 / P-ISX-FF)
Power booster (1-008-779 / O-S2-18, 1-009-280 / O-S2-30)
 󰀨
Home door sensor (1-052-723 / SAB00103)
 
MySentio Remote (1-053-314 / S-WIFI02)
3.3. Product features
PRO B2
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 switching capacity to be increased from
10.5 kW to 18 kW or 30 kW.
Switching a cabin light (up to 100 W)
Remote start function
Door monitoring system
Preset time function (up to 24 hours)
Automatic heating time limit
The sauna control unit shuts down automatically after the maximum heating
time for safety reasons. The maximum heating period can be set to 6 h, 12 h,
18 h or 24 h.

Instructions for installation and use p. 10/38
Overheat cut-out
The overheat cut-out is installed in the housing for the heater sensor. If a
defect causes the sauna heater to continue heating after reaching the pre-
󰀨
temperature of around 139 °C.
PRO B3
Same functional scope as the PRO B2, with the following additional features:
Regulation of combi heaters with a heating output of up to 10.5 kW and va-
porizer output of up to 3.5 kW in the temperature range spanning 30 °C to
110 °C and a humidity range spanning 5% to 100 %.
Post-drying program
After operation in combined mode, the post-drying program starts automat-
ically to prevent mould or rot from forming in the sauna cabin. This involves
heating the sauna cabin to 80°C with the fan running.
The duration can be set from OFF - 60 minutes.
3.4. Sauna operating modes
The sauna control unit PRO B2 enables sauna mode. The sauna control unit
PRO B3 enables two operating modes, sauna mode and combi mode.
Sauna mode
Dry heat is provided in sauna mode. The temperature in the cabin is high (80 to
100°C). The humidity is low (no more than 10%).
Combi mode (PRO B3 only)
In combined mode, the vaporizer operates along with the heater. The temper-
ature in the sauna cabin is lower (around 40 to 65 °C) than in sauna mode, but
the relative humidity is much higher, ranging from 35% to 70%. The maximum
humidity that can be set depends on the temperature of the sauna. The higher
the sauna temperature, the lower the maximum humidity level which can be set
(see characteristic curve on page 11).

EN
Instructions for installation and use p. 11/38
3.5. Sensor operating modes
The sauna control unit can be operated with one or two sensors. A temperature
sensor (bench sensor, F2) or a humidity/temperature sensor (FTS2, PRO B3
only) can be used as the second sensor.
Single sensor mode (F1)
Single-sensor mode must be activated using the function selection switch (see
8.5. Activating/deactivating the single-sensor mode on page 25).
In single-sensor mode, the sauna control unit is operated with the heater sensor
with overheat cut-out (F1) only. This is included in the scope of delivery.
In single-sensor mode, the sauna control unit only displays the set temperature as
standard. The actual temperature is not displayed. If the sauna control unit is to
display the temperature above the heater (F1 sensor) as the actual temperature
in single-sensor mode, this must be activated during commissioning (see page
8.7. Displaying the heater temperature in single-sensor mode on page 26).
PRO B3 only: The maximum humidity level which can be set is based on the
temperature above the heater, and the humidity is timed. Only the set value for
the humidity level (in % of relative humidity) is displayed by the sauna control unit.
The actual humidity in the sauna cabin when the humidity is timed depends on
󰀨
Two-sensor mode with bench sensor (F2)
Two-sensor mode is the factory setting.
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.
PRO B3 only: In two-sensor mode with bench sensor, the humidity is timed.
Only the preset value for the humidity (in % relative humidity) is shown on the
display of the sauna control unit. The actual humidity in the sauna cabin when
the humidity is timed depends on the size of the cabin and the vaporizer output,
󰀨

Instructions for installation and use p. 12/38
PRO B3 only:
Two-sensor mode with humidity/temperature sensor (FTS2)
Two-sensor mode is the factory setting.
When a humidity/temperature sensor is used in two-sensor mode, the sauna
control unit displays the temperature which is measured by the humidity/tem-
perature sensor as the actual temperature.
In two-sensor mode with humidity/temperature sensor, the vaporizer is regulated
in accordance with the humidity level measured in the sauna cabin. The sauna
control unit displays the actual humidity (in % relative humidity) in the sauna cabin.
Temperature °C
Relative humidity %
EN 60335-2-53:2011; characteristic temperature / relative humidity for proper use.

EN
Installation instructions, only for experts p. 13/38
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 cabin 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 cables supplied with
the unit, which are heat-resistant up to 150°C.
ATTENTION!
Damage to the unit
The sauna control unit is resistant to splashing water, but direct contact with
water could still damage it.
Install the sauna control unit in a dry place at which a maximum humidity of
95% is not exceeded.
The sensor leads may be extended under the following conditions:
A silicon cable resistant to temperatures up to 150 °C is used.
The minimum cross-sectional of the cable is 0.5 mm2.
The heater sensor cables may NOT be longer than 10 m.
ATTENTION!
Interference can impair signal transmission
Route all sensor cables separately from other mains cables and control cables.
Protect cables with only one layer of insulation by using a conduit (double
insulation).

Installation instructions, only for experts p. 14/38
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 cross-head screws (16 mm) into the wall of the sauna at a height
of approx. 1.70 m and leaving a protruding length of 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 cross-head screws using attachment
device Aas an aid (see Fig.1).
4. Screw two cross-head screws (16 mm) into the lower fastening holes B
(see Fig.1).
A
B
Fig.2 Removing the cover from the housing

EN
Installation instructions, only for experts p. 15/38
4.2. Installing the heater sensor F1 with overheat cut-out
Note the following points when installing the heater sensor:
The heater sensor must be installed on the rear of the heater, above the
middle of the sauna heater. A distance of about 15 cm from the ceiling of the
cabin must be maintained.
󰀨

To install the heater sensor, carry out the following steps (see Fig.3):
1. Route the two 2-pole heater sensor cables in the wall of the sauna cabin
󰀩
cables using cable clips.
2. Pull the two half-shells 1of the heater sensor apart.
3. Connect the four connections for the heater sensor lead 5in accordance
with 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 two cross-
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 supplied
wood screws 6(16 mm).
1Heater sensor half-shells
2Connection panel
3Cross-head screws (9 mm)
4Heater sensor
5Heater sensor leads
6Wood screws (16 mm)
Fig.3 Installing the
heater sensor
Red White White Red

Installation instructions, only for experts p. 16/38
4.3. Installing the bench sensor F2 (optional)
The bench sensor must be installed on the wall of the cabin above the rear bench
seat. A distance of about 15 cm from the ceiling of the cabin must be maintained.
To install the bench sensor, carry out the following steps:
1. Route the 2-pole bench sensor lead in the wall of the sauna cabin to the
󰀩
using cable clips.
2. Pull the two half-shells of the bench sensor apart.
3. Connect the two connectors for the bench sensor lead 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
cross-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 cabin using the two sup-
plied wood screws (16 mm). Maintain a clearance of 15 cm from the roof
of the sauna cabin.
4.4. Installing the humidity/temperature sensor FTS2
(optional, PRO B3 only)
The humidity/temperature sensor must be installed on the wall of the cabin above
the rear bench seat. A distance of approx. 15 cm from the ceiling of the cabin
must be maintained.
To install the humidity and temperature sensor, perform the following steps:
1. Route the 5-pole sensor cable in the wall of the sauna cabin to the mount-
󰀩
using cable clips.
2. Install the humidity/temperature sensor to the wall of the sauna cabin using
the two supplied wood screws (16 mm). Maintain a clearance of 15 cm to
the roof of the sauna cabin.

EN
Installation instructions, only for experts p. 17/38
5.Electrical connection
ATTENTION!
Damage to the unit
The sauna control unit may only be used for operating and controlling 3 heating
circuits with a maximum heating capacity of 3.5 kW per heating circuit. The
maximum vaporizer output (PRO B3 only) is 3.5 kW.
1
2
4
3
5
6
b
7
8
9
a
c
d
e
f
1Low-voltage connection area
2󰀨
remote start and sensor wires
3Function selection switch
4Cable bushing for F2 and FTS2 sensors
5Cable bushing for F1 sensor
6󰀨
start
7Cable bushing for vaporizer cable
8Cable gland for heater cable
9Cable gland for power supply cable
aCable gland for power booster
bCable gland for light and fan
cTerminal strip for heater and vaporizer and
power supply cable
dTerminal strip for lights and fan
eTerminal strip for power booster
fConnection area for 230 V/400 V
g Earthing bar
h RJ45 socket for RS485 and MySentio WiFi
g
h

Installation instructions, only for experts p. 18/38
Observe the following points when connecting the power to the sauna control unit:
Installation may only be performed by a qualified electrician or similarly

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 fully disconnecting all-pole isolating device compliant with overvoltage

Observe the connection diagram Fig.4 on page 22 or Fig.5 on page 23.
5.1. Connecting the power supply cable, heater and vaporizer
1. Feed the power supply, heater and vaporizer cables (PRO B3 only) through
the cable glands 9,8, 7into the connection area for 230 V/400 V f.
2. Connect the cables to the terminal strip cin accordance with the connection
diagram. Follow the operating instructions for each device.
3. 󰀨
then perform the following step as well:
Use the wire jumper enclosed to connect terminal "V1" to terminal "Wm".
5.2. Connecting the light
1. Feed the light cable through the cable gland 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.
5.3. Connecting a fan (optional, PRO B3 only)
1. Feed the fan cable through the cable gland binto the connection area
for 230 V/400 V f.
2. Connect the fan cable to the terminal strip d in accordance with the con-
nection diagram. Observe the operating instructions for the respective device.

EN
Installation instructions, only for experts p. 19/38
5.4. Connecting a power booster (optional)
1. Feed the cable for the power booster through the cable gland ainto the
connection area for 230 V/400 V f.
2. Connect the cable for the power booster to the terminal strip e
in accordance with the connection diagram. To do so, use terminal
“ST1” for the safety circuit, and terminal “ST2” for the control circuit.
Follow the operating instructions for each device.
5.5. Connecting the heater sensor F1
1. Feed the wires for the heater sensor through the cable gland 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.
5.6. Connecting the bench sensor F2 (optional)
1. Feed the wires for the bench sensor through the cable gland 4into the
low-voltage connection area 1.
2. Connect the wires for the bench sensor to the terminals labelled “F2” in
terminal strip 2.
5.7. Connecting the humidity/temperature sensor FTS2 (op-
tional, PRO B3 only)
1. Feed the wires for the sensor through the cable gland 4into the low-
voltage connection area 1.
2. Connect the wires for the temperature sensor to the terminals labelled “F2”
in terminal strip 2.
a. the black wire to the right terminal.
b. the brown wire to the left terminal.
3. Connect the wires for the humidity sensor to the terminals labelled “+ S -”
in terminal strip 2.
c. the green wire to terminal “+”.
d. the orange wire to terminal “S”.
e. the red wire to terminal “-”.

Installation instructions, only for experts p. 20/38
5.8. Connecting the safety shut-o󰀨/door sensor
EN 60335-2-53 states that sauna control units with a remote control function may

combustion test described in paragraph 19.101. Alternatively, a suitable safety
󰀨󰀨
󰀨
or the sauna door is opened.
󰀨
1. 󰀨
for the device.
2. 󰀨6into the
low-voltage connection area 1.
3. Connect the cables to the terminals labelled “OSG” in terminal strip 2.
󰀨
labelled “OSG”.
5.9. Remote start
The remote start device is connected using terminals “S”, “B” and “C”. “S” stands for
sauna mode and “C” for vaporizer mode. “B” is a +24 V DC output. The preferred
operating mode must be activated using a switch or actuator on the terminal.
5.10.Finishing the installation
1. Connect the protective earth conductors for the power supply cable and all
devices to the earthing bar 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.