Harvia sentiotec Pro-C3 User manual

Version 04/18 ID no. 1-026-969
EN
INSTRUCTIONS FOR INSTALLATION AND USE
English
Sauna control unit
Pro C3
PRO-C3

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 functions 9
3.4. Sauna operating modes 11
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 excess temperature fuse 15
4.3. Installing bench sensor F2 (optional) 16
4.4. Installing the humidity temperature sensor FTS2 (optional) 16
4.5. Installing the foil sensor (optional) 17
5. Electrical connection 18
5.1. Connecting the power supply cable, heater and evaporator 19
5.2. Connecting the light 19
5.3. Connecting the fan (optional) 20
5.4. Connecting the additional output (optional) 20
5.5. Connecting the power booster (optional) 20
5.6. Connecting heater sensor F1 21
5.7. Installing bench sensor F2 (optional) 21
5.8. Installing humidity temperature sensor FTS2 (optional) 21
5.9. Connecting the lm sensor (optional) 21

EN
5.10. Connecting the safety shut-off 22
5.11. Remote start 22
5.12. Status output 23
5.13. Finishing installation 23
6. Performing tests 24
7. Connection diagram 26
8. Starting up 27
8.1. Function selection switch settings 27
8.2. Settings in the technician menu 29
9. Operating elements 34
9.1. Description of the operating elements 34
9.2. The function selector 34
9.3. The intensity selector 35
10. Operation 35
10.1. Switching on the light 35
10.2. Switching on the sauna control unit 36
10.3. Starting sauna mode 36
10.4. Starting combi mode 37
10.5. Starting additional output 38
10.6. Switching on the light 40
10.7. Starting the fan 41
10.8. Setting the preset time 42
10.9. Cancelling the preset time function 43
10.10.Setting the duration 43
10.11.Activating standby for remote operation 44
10.12.Changing the preset values 44

10.13.Cancelling the post-drying programme 45
10.14.Switching off functions 45
10.15.Switching off the sauna control unit 45
11. User program 46
11.1. Preset user programs 46
11.2. Accessing user programs 47
11.3. Creating your own user programs 47
12. The Eco-function 49
13. Cleaning and maintenance 50
13.1. Cleaning 50
13.2. Maintenance 50
14. Disposal 50
15. Troubleshooting 51
15.1. Error messages 51
15.2. Low-water display 52
15.3. Fuses 52
16. Technical data 53

EN
Instructions for installation and use p. 5/54
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 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. 6/54
2. Important information for your safety
The sauna control unit Pro C3 has been produced in accordance
with the applicable safety regulations for technical units. However,
hazards may occur during use. Therefore adhere to the following
safety information and the specic warning notices in the individual
chapters. Also observe the safety information for the devices con-
nected.
2.1. Intended use
The sauna control unit Pro C3 is used exclusively for operating and
controlling the sauna functions in accordance with the technical data.
The sauna control unit Pro C3 may only be used for operating and
controlling a sauna heater which has been certied 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: safety shut-off, see
5.10 on page 22).
The sauna control unit Pro C3 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 evaporator capacity totals
3.5 kW. The maximum additional output capacity totals 3.5 kW.
Any use exceeding this scope is considered improper use. Improper
use can result in damage to the product, in severe injuries or death.

EN
Instructions for installation and use p. 7/54
2.2. Safety information for the installer
●Installation may only be performed by a qualied electrician or
similarly qualied person.
●Work on the sauna control unit may only be performed when the
power has been disconnected.
●An all-pole disconnecting device with full cut-off compliant with
overvoltage category III must be tted on-site.
●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-
fected by a ow of air.
●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-
lems that are not explained in sufcient detail in the installation
instructions.

Instructions for installation and use p. 8/54
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.
● For health reasons, do not use the sauna when under the inu-
ence of alcohol, medication or drugs.
● Make sure that no ammable objects have been placed on the
sauna heater before the sauna control unit is switched on.
● Make sure that no ammable objects have been placed on the
heater before activating the preset time function or the stand-by
mode for the remote start.
●Make sure that no flammable objects have been placed on
or in front of the infrared lamp before the sauna control unit is
switched on.
● Make sure that no ammable objects have been placed on the
heater before activating the infrared lamp or the stand-by mode
for the remote start.
●For your own safety, consult your supplier in the event of prob-
lems that are not described in sufcient detail in the operating
instructions.

EN
Instructions for installation and use p. 9/54
3. Product description
3.1. Scope of delivery
●Sauna control unit
●Heater sensor with integrated excess temperature fuse
●Installation material
●Wire jumper for bridging terminals V1 and Wm for combi heaters without
low-water shut-off
3.2. Optional accessories
●Bench sensor (item number: O-F2), sensor wires 1.5 m
●Humidity temperature sensor (item number: O-FTS2), sensor wires 3 m
●Foil sensor (item number: P-ISX-FF), sensor wires 3 m
●Power booster (item number: O-S2-18 / O-S2-30)
●Safety shut-off (item number: HT-SWL)
●pronet web server (item number: PRO-NET)
3.3. Product functions
The sauna control unit Pro C3 features the following functions:
●Regulation of combi heaters with a heating output of up to 10.5 kW and
evaporator 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 %.
●A power booster allows the maximum contact rating to be increased from
10.5 kW to 18 kW or 30 kW.
●Optional dimming or activation of a room light (up to 100 W)
●Optional dimmer function or activation of a fan (up to 100 W)
●Remote start function

Instructions for installation and use p. 10/54
●Status output
●Preset time function (up to 24 hours)
●Additional output
Either for dimming (up to 500 W), switching (up to 3.5 kW) or regulating the
sauna room temperature via the additional output.
The additional output has no excess temperature fuse. For this reason, only
intrinsically safe devices should be operated using the additional output.
– If infrared heaters are connected to the additional output, these must
have an excess temperature fuse. We recommend using the following
infrared lamps:
●DIR-350-R, WIR-350-R, DIR-500-R, WIR-500-R, DIR-750-R,
WIR-750-R, DIR-1300-R, WIR-1300-R
●ECO-350-R, ECO-350-G, ECO-500-R, ECO-500-G, ECO-750-R
– If one of the following infrared heat plates is connected to an additional
output, the foil sensor P-ISX-FF must be used, and must be activated
in the technician menu (see 8.2. Settings in the technician menu on
page 29):
●IR-WP-100, IR-WP-175, IR-WP-390, IR-WP-510
●IR-WPHL-100, IR-WPHL-175, IR-WPHL-390, IR-WPHL-510
●User program
The user program enables favourite sauna settings to be saved and accessed
again. There are 5 preset user programs available which can be modied
according to user requirements.
●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.
●Post-drying programme
Once combi-mode has nished, the post-drying programme starts automati-
cally to prevent mould or rot from forming in the sauna room. This involves
heating the sauna room to 80 °C with the fan running for 30 minutes.

EN
Instructions for installation and use p. 11/54
●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.
3.4. Sauna operating modes
The sauna control unit Pro C3 provides two operating modes, sauna mode and
combi mode.
Sauna mode
Dry heat is provided in sauna mode. The temperature in the room is high (80 to
100 °C) The humidity level of maximum 10 % is low.
Combi mode
The evaporator operates along with the sauna heater in combi mode. The
temperature in the sauna room is lower (approx. 40 to 65 °C) than in sauna
mode, with the relative humidity being considerably higher, spanning 35 % to
approximately 70 %. The maximum humidity level which 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.
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 sensor (FTS2) can be used as the
second sensor.
Single-sensor mode (F1)
Single-sensor mode must be activated in the technician menu (see 8.2. Settings
in the technician menu on page 29).
In single-sensor mode, the sauna control unit is operated with the heater sensor
with excess temperature fuse (F1) only. This is included in the scope of delivery.

Instructions for installation and use p. 12/54
In single-sensor mode, the sauna control unit only displays the set temperature
as standard. The actual temperature is not displayed. 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 starting up for the rst time (see
8.2. Settings in the technician menu on page 29)
The maximum humidity level which can be set in single-sensor mode 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 level in the sauna room when humidity is timed
depends on the size of the room and the evaporator capacity, and may deviate
from the set value.
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.
In two-sensor mode with bench sensor, 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 level in the sauna room when humidity is timed
depends on the size of the room and the evaporator capacity, and may deviate
from the set value.
Two-sensor mode with humidity temperature sensor (FTS2)
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 evaporator is regu-
lated in accordance with the humidity level measured in the sauna room. The
actual value for the humidity level (in % of relative humidity) is displayed by the
sauna control unit.

EN
Installation instructions, only for experts p. 13/54
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 is 0.5 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).

Installation instructions, only for experts p. 14/54
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).
82
80
34
175
145
34
43
40
A
B
Fig. 2 Removing the cover from the housing

EN
Installation instructions, only for experts p. 15/54
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.
● The heater sensor must be attached in a way that it is not affected by a ow
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
them to the heater sensor installation location and afx the heater sensor
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

Installation instructions, only for experts p. 16/54
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
them to the bench sensor installation location and afx the bench sensor
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.
4.4. Installing the humidity temperature sensor FTS2 (optional)
The humidity temperature sensor must be installed on the wall of the sauna room
above the rear bench seat. A distance of approx. 15 cm to the roof of the sauna
must be maintained.
To install the humidity temperature sensor, perform the following steps:
1. Lay the two 5-pin bench sensor wires in the wall of the sauna room, leading
them to the humidity temperature sensor installation location and afx the
sensor wires using wire clips.
2. Install the humidity temperature sensor to 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.

EN
Installation instructions, only for experts p. 17/54
4.5. Installing the foil sensor (optional)
If one of the following infrared heat plates is connected to an additional output,
the foil sensor P-ISX-FF must be used:
●IR-WP-100
●IR-WP-175
●IR-WP-390
●IR-WP-510
●IR-WPHL-100
●IR-WPHL-175
●IR-WPHL-390
●IR-WPHL-510
●When installing the foil sensor, observe the operating instructions for the
infrared heat plates.
●Use of a foil sensor must be activated in the technician menu (see 8.2. Set-
tings in the technician menu on page 29).

Installation instructions, only for experts p. 18/54
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.
The maximum evaporator capacity totals 3.5 kW. The maximum additional
output capacity totals 3.5 kW.
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, status output and sensor wires
3Function selection switch
4Cable bushing for operating unit, F2, FTS2
and foil sensors
5Cable bushing for F1 sensor and status
output
6Cable bushing for safety shut-off device
and remote start
7Cable bushing for evaporator wire and
additional output
8Cable bushing for heater wire
9Cable bushing for power supply cable
aCable bushing for power booster
bCable bushing for lights and fan
cTerminal strip for heater and evaporator wires,
power supply cable and additional device
dTerminal strip for lights and fan
eTerminal strip for power booster
fConnection area for 230 V / 400 V
g Earth rail
h RJ45 socket for RS-485 and pronet
g
h

EN
Installation instructions, only for experts p. 19/54
Please observe that in the event of a guarantee claim, a copy of the bill
from the electrician performing the work must be presented.
Observe the following points when connecting the power to the sauna control unit:
●Installation may only be performed by a qualied electrician or similarly quali-
ed person.
●Work on the sauna control unit may only be performed when the power has
been disconnected.
● There must be a xed connection for the electrical power supply.
●An all-pole disconnecting device with full cut-off compliant with overvoltage
category III must be tted on-site.
●Observe the connection diagram (Fig. 4) on page 26.
5.1. Connecting the power supply cable, heater and evaporator
1. Guide the power supply, heater and evaporator cable through the cable
bushings 9, 8, 7into 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.
3. If the evaporator does not feature an automatic low-water indicator, 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. 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.

Installation instructions, only for experts p. 20/54
5.3. Connecting the fan (optional)
1. Guide the light cable through the cable bushing binto the connection area
for 230 V/400 V f.
2. Connect the fan cable to the terminal strip din accordance with the connec-
tion diagram. Observe the operating instructions for the respective device.
5.4. Connecting the additional output (optional)
The additional output can, for example, be used for an infrared lamp or infrared
heat plates.
WARNING!
Risk of re
The additional output has no excess temperature fuse. For this reason, only
intrinsically safe devices should be operated using the additional output.
●If infrared heaters are connected to the additional output, these must
have an excess temperature fuse.
●If infrared heat plates are connected to an additional output, the foil
sensor P-ISX-FF must be used, and must be activated in the techni-
cian menu (see 8.2. Settings in the technician menu on page 29).
1. Guide the connection cable for the additional device through the cable bush-
ing 7into 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 and safety
instructions for the respective device.
5.5. 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.