Sentiotec PRO LT2 Installation And Operating Instructions Manual

Sauna control unit

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Sauna control unit

PRO LT2 / PRO LT3

INSTALLATION AND OPERATING INSTRUCTIONS

English

1-054-047 / PRO-LT2

1-054-048 / PRO-LT3

Version 10/24

Ident no. PRO-LT

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Summary of Contents for Sentiotec PRO LT2

Page 1 Sauna control unit PRO LT2 / PRO LT3 INSTALLATION AND OPERATING INSTRUCTIONS English 1-054-047 / PRO-LT2 1-054-048 / PRO-LT3 Version 10/24 Ident no. PRO-LT...
Page 2 Table of Contents 1. About this instruction manual 2. Important information for your safety 2.1. Intended use 2.2. Safety information for the installer 2.3. Safety information for the user 3. Product description 3.1. Scope of delivery 3.2. Not supplied 3.3. Optional accessories 3.4.
Page 3 5.4. Connecting an external main switch (optional) 5.5. Connecting the light 5.6. Connecting an external light switch (optional) 5.7. Connecting a fan (optional) 5.8. Connecting the heater sensor F1 5.9. Connecting the bench sensor F2 (included in scope of delivery for PRO-LT3, optional for PRO-LT2) 5.10. C onnecting the humidity/temperature sensor FTS2 (optional) 5.11. C onnecting the dummy sensor (pre昀椀tted for PRO-LT3,...
Page 4 9.10. Cancelling the post-drying programme 9.11. Setting the timer 9.12. Dimming the light (incandescent bulb only, not LEDs) 9.13. Setting the preset time 9.14. ECO mode 9.15. Activating standby for remote operation 9.16. Remote start release 9.17. Activating an additional control unit 9.18. Setting the acoustic signal 9.19. Activating the rolling display 9.20. Setting the post-drying programme 9.21. Shutting down the sauna control unit completely (optional) 10.
Page 5 Instructions for installation and use p. 5/40 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. These installation and operating instructions can also be found in the downloads section of our website: www.mediabank.harvia.com 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.
Page 6 1. Instructions for installation and use p. 6/40 2. Important information for your safety The PRO-LT2 / LT3 sauna control unit has been manufactured according to the applicable safety regulations. However, hazards may arise during use. You should therefore adhere to the following safety information and the speci昀椀c warnings in the installation and operating instructions. Also observe the safety information for the devices connected. 2.1. Intended use The PRO-LT2 / LT3 sauna control unit is used exclusively for op- erating and controlling the sauna functions in accordance with the technical data.
Page 7 Instructions for installation and use p. 7/40 2.2. Safety information for the installer ● The electrical connection may only be performed by a quali昀椀ed electrician or similarly quali昀椀ed person. Please note that in the event of a guarantee claim, a copy of the invoice issued by 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 category III must be 昀椀tted on site. ● The power unit of the PRO LT (PRO-LT-PU) must be installed in accordance with the technical data. ● The control panel can be installed inside or outside the sauna; however, the speci昀椀cations in the installation and operating in- structions provided must be followed. ●...
Page 8 1. Instructions for installation and use p. 8/40 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. ●...
Page 9 Instructions for installation and use p. 9/40 3. Product description The PRO-LT is a two-piece sauna control unit. In order to function, a power unit (PRO-LT-PU), a control panel (PRO-LT-CU) and a heater sensor (O-F1) are always required. 3.1. Scope of delivery ● Control panel (PRO-LT-CU) ● Power unit (PRO-LT-PU) ● Heater sensor with integrated overheat cut-out (O-F1) ● Sensor cables ● PRO-LT3 only: Expansion board for bench sensor, vaporizer, fan (PRO-LT-PCB) ● PRO-LT3 only: Bench sensor (O-F2) ● PRO-LT3 only: Dummy sensor ● Installation and operation manual 3.2. Not supplied ●...
Page 10 1. Instructions for installation and use p. 10/40 3.4. Product features The sauna control unit PRO-LT features the following functions: ● Regulation of sauna heaters with a heating output of up to 11 kW. ● When an expansion board is installed, regulation of combined heaters with a heating output of up to 11 kW and vaporizer output of up to 3 kW. ● When a power booster is installed, the maximum power rating of 11 kW can be increased. ● Option to connect external main switch ● Option to connect external light switch ● Switching and dimming a cabin light (up to 100 W bulb) ● Fan regulation (up to 100 W) ● Automatic heating time limit The sauna control unit shuts down automatically for safety reasons after the maximum heating time (1 to 12 hours).
Page 11 Instructions for installation and use p. 11/40 3.5. Sauna operating modes Sauna mode (PRO-LT2 and PRO-LT3) 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-LT3 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 (Fig. 1 on page 12). 3.6. Sensor operating modes The sauna control unit PRO-LT 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 is the factory setting.
Page 12 1. Instructions for installation and use p. 12/40 Two-sensor mode with bench sensor (F2) (PRO-LT3) (PRO-LT2 with optional expansion board) 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 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, and may di昀昀er from the setpoint. (Dummy sensor required) Two-sensor mode with humidity sensor (FTS2) (PRO-LT3) (PRO-LT2 with optional expansion board) In two-sensor mode with humidity/temperature sensor, the sauna control unit displays the temperature measured by the humidity/temperature sensor as the...
Page 13 Instructions for installation and use p. 13/40 4. Installation During installation observe the technical data; see Page 39: 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). ● The sensors may only be connected using the sensor cables supplied with the unit, which are heat-resistant up to 150 °C. ● The heater sensor cables may NOT be longer than 10 m. ● Outside the cabin, the sensor cables can be extended using cables that are not temperature-resistant.
Page 14 Installation instructions, only for experts p. 14/40 (prefitted for PRO-LT3, 4.4. Installing the expansion board optional for PRO-LT2) 1. Connect the expansion board to the base board using the pre-con昀椀gured cables (L-N-PE) and the ribbon cable. 2. Fasten the expansion board in place using the screws provided. Expansion board Basic module PRO-LT-PCB Fig. 2: PRO-LT power unit 4.5. Installing the control panel For the installation, a standard jigsaw, for example, is required to cut out the recess for the control panel. The control panel can be installed both inside and outside the cabin.
Page 15 Installation instructions, only for experts p. 15/40 External view Power unit min. 30 cm Control panel when installed inside the cabin Fig. 3: Control panel position 1. Cut out the 70 x 65 mm recess using a jigsaw, for example (see Fig. 4). 2. Provide cable guides for the connecting cables. 3. Connect the 4-pin plug to the RJ10 socket on the control panel. 4. Screw the housing to the cabin wall by screwing the 4 wood screws supplied through the hole.
Page 16 Installation instructions, only for experts p. 16/40 5. The front panel of the control panel is inserted with slight pressure into the housing. Ensure that the lower catches engage noticeably. Fig. 5: Installing the front panel of the control panel Heater sensor half-shells Connection panel Cross-head screws (9 mm) Heater sensor Heater sensor leads Wood screws (16 mm) Fig. 6: Installing the heater sensor for wall heaters 19 cm < 2 × 2 m 35 cm >...
Page 17 Installation instructions, only for experts p. 17/40 4.6. Installing the heater sensor F1 with overheat cut-out Note the following points when installing the heater sensor Fig. 6 and Fig. 7: ● The heater sensor must be installed on the rear of the heater, above the middle of the wall heater. A distance of about 15 cm from the ceiling of the cabin must be maintained. For free-standing and tower heaters, please see Fig.
Page 18 Installation instructions, only for experts p. 18/40 5. Electrical connection Fig. 8: Electrical connection RJ10 socket for control unit data cable 230 V / 400 V connection areas Terminal strip for power supply cable Terminal strip for remote strip Earth rail Bushing for RJ10 data cable, F1/F2 sensors and remote start device Bushing for power supply cable Terminal strip for F1 sensor Bushing for heater cable Bushing for FTS2 sensor Terminal strip for heater cable Terminal strip for F2 / FTS2 sensor Bushing for light and power booster Bushing for fan cable Terminal strip for light Low voltage connection area Terminal strip for light switch Bushing for vaporizer cable Bushing for light switch and main switch Terminal strip for vaporizer cable and fan Terminal strip for main switch...
Page 19 Installation instructions, only for experts p. 19/40 Observe the connection diagrams - Fig. 8 on page 18 and Fig. 9 on page 23 and, if appropriate, Fig. 10 on page 24 (optional). 5.1. Connecting the power supply cable and heater 1. Guide the power supply and heater cable through the bushings into the 230 V/400 V connection area 2.
Page 20 Installation instructions, only for experts p. 20/40 5.4. Connecting an external main switch (optional) The main switch is not included on delivery. 1. Guide the main switch connection cable through the bushing into the 230 V/400 V connection area 2. Connect the cable to terminal strip . Follow the operating instructions for the switch. The contacts are bridged on delivery. Remove the wire jumper for in- stallation 5.5.
Page 21 Installation instructions, only for experts p. 21/40 5.9. Connecting the bench sensor F2 (included in scope of delivery for PRO-LT3, optional for PRO-LT2) into the low-voltage 1. Guide the bench sensor cables through the bushing connection area 2. Connect the bench sensor wires to the terminals labelled “F2: ws-ws” in terminal strip For timed humidity in two-sensor mode (F1 and F2), the dummy sensor must be installed (see 5.11) 5.10. Connecting the humidity/temperature sensor FTS2 (optional) into the low-voltage 1.
Page 22 Installation instructions, only for experts p. 22/40 5.12. Connecting a power booster (optional) 1. Guide the power booster cable through the bushing into the 230 V/400 V connection area 2. Connect the power booster cable to terminal strip . Use the terminal labelled “ST1” for the safety circuit (ST1), the terminal labelled “V” for the control circuit (ST2) and the terminal labelled “N” for ST3. Follow the oper- ating instructions for each device.
Page 23 Installation instructions, only for experts p. 23/40 6. Connection diagram 6.1. Connection diagram of power unit basic module PRO-LT-PCB WC4-H-PCB (optional) (Optional for PRO-LT2) ge/gn - bl - sw WC4-H-PCB Remote start RT-RT WS-WS RJ10 Jumper FTS2 N Li Fig. 9: Connection diagram for the basic module Power supply cable Heater Fuse [A]...
Page 24 Installation instructions, only for experts p. 24/40 6.2. Connection diagram for expansion board (PRO-LT3, optional for PRO-LT2) White ws - ws br - bl Dummy blue Heating system (max.11 kW) sw - br gn - or - rt FTS2 RJ10 connection for control unit Black Expansion board Power booster Brown Light Jumper for FTS2 Green Light switch Remote start device Orange...
Page 25 Installation instructions, only for experts p. 25/40 7. Carrying out testing / Commissioning The following tests must be performed by a quali昀椀ed electrician. WARNING! The following tests must be carried out 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 overheat cut-out on the heater sensor F1. a. Switch on the sauna control unit. b.
Page 26 Instructions for use for the user p. 26/40 8. Operating and display unit (3-digit seven-segment Display Plus display) Indicator lamp: Light Mode (settings) Indicator lamp: Humidity Indicator lamp: Standby On/O昀昀 Indicator lamp: Temperature Indicator lamp: Timer Minus...
Page 27 Instructions for use for the user p. 27/40 9. Operation Observe “8. Operating and display unit” on page 26. 9.1. Switching on Switch on the controller by switching on the external main switch (optional). ► The standby indicator lamp lights up and remains lit. 9.2.
Page 28 Instructions for use for the user p. 28/40 9.4. Switching on the light (cleaning light) The light (cleaning light) in the sauna cabin can be switched on and o昀昀 using an external light switch (see 5.4 on page 20) in any operating mode. The light (cleaning light) in the sauna cabin can also be switched on and on the control panel. (The controller off by pressing the On/Off button must be set to standby mode for this). The light switches off automatically after 5 minutes. ►...
Page 29 Instructions for use for the user p. 29/40 9.7. Switching o昀昀 sauna mode Brie昀氀y press the On/O昀昀 button ► The sauna heater switches o昀昀. ► The standby indicator lamp 昀氀ashes. The operating mode is now OFF ► The light (cleaning light) is on. To switch o昀昀 the controller, brie昀氀y press the On/O昀昀 button ► The standby indicator lamp 昀氀ashes = standby mode 9.8. Starting combined mode Select HUM mode. Brie昀氀y press the On/O昀昀 button ► The controller starts with the settings that were most recently used for this operating mode. ► The standby and temperature indicator lamps light up.
Page 30 Instructions for use for the user p. 30/40 9.10. Cancelling the post-drying programme After combined mode, the post-drying programme is started automatically. The display 1 shows the message “dry” and the humidity indicator lamp 昀氀ashes. For the settings possible for the post-drying programme, see 9.20 on page 34 ► Press the On/Off and Minus buttons simultaneously for around 3 seconds. To prevent mould and rot from forming, the post-drying programme should NOT be stopped. 9.11. Setting the timer The timer can be set in minutes (0 to 99). An acoustic signal (buzzer in the power unit) sounds after the time has elapsed. Press the Mode button until the timer indicator lamp lights up.
Page 31 Instructions for use for the user p. 31/40 9.13. Setting the preset time The preset time can be set in hours (1 to 24). The controller must be set to standby mode for this. Press the On/O昀昀 and Plus buttons simultaneously for 3 seconds. ► The time that was most recently set 昀氀ashes in the display Select the preferred preset time using the Minus 5 and Plus 6 buttons (OFF, 1–24). Press the Mode button 7 to switch to FIN or HUM mode and press the On/O昀昀 button 4 to con昀椀rm.
Page 32 Instructions for use for the user p. 32/40 9.15. Activating standby for remote operation EN 60335-2-53 speci昀椀es that sauna control units with a remote start function must be set manually to “Standby for remote operation” mode. This activation must take place again after each remote start and stop procedure. Perform the following steps: Make sure that the sauna control unit is in standby mode. Press the On/O昀昀 button 4 and the Mode button 7 simultaneously for around 3 seconds. ► “rc” (remote control) 昀氀ashes in the display ► The sauna control unit is then ready to be started and stopped using a remote start signal. ► After a remote start and stop, the “rc” display and the remote start symbol goes out and the mode has to be activated again. To cancel the “Standby for remote control” function, press the On/O昀昀...
Page 33 Instructions for use for the user p. 33/40 9.17. Activating an additional control unit Up to four control units can be connected (see 5.3 on page 19). Switch on the controller (standby indicator lamp lights up). Unplug the data cable of the additional control unit. Press and hold the Minus and Plus buttons on the unplugged control unit while plugging the data cable back in.
Page 34 Instructions for use for the user p. 34/40 9.19. Activating the rolling display Rolling display means that the temperature and humidity (optional) are shown alternately in the display (10 second interval) To do this, the controller must be set to FIN or HUM mode. Press the Mode button until the light indicator lamp lights up. Press the Minus 5 and Plus 6 buttons simultaneously for 3 seconds. ►...
Page 35 Instructions for use for the user p. 35/40 9.21. Shutting down the sauna control unit completely (optional) If you will not be using the sauna control unit for an extended period of time, switch it o昀昀 at the main switch 10. Cleaning and maintenance 10.1. Cleaning ATTENTION! Damage to the unit The sauna control unit is resistant to splashing water, but direct contact with water could still damage it. ● NEVER immerse the unit in water. ● Do not pour water over the unit. ●...
Page 36 1. Instructions for installation and use p. 36/40 12. Troubleshooting 12.1. Error messages The sauna control unit is equipped with diagnostic software which monitors system statuses when it is switched on and during operation. As soon as the diagnostic software identi昀椀es an error, the sauna control unit switches o昀昀 the sauna heater. The operating symbols 昀氀ash and an error number appears in the display Switch o昀昀 the sauna control unit using the main switch and rectify the fault before switching it on again. The following table describes the possible faults and their causes. If necessary, quote the error number to your customer service specialist. Fault Remedy/cause Description No control unit has been con- No control unit connected.
Page 37 Instructions for installation and use p. 37/40 12.2. HUM is not displayed Check the circuit continuity of the connecting cables between the basic module and the expansion board (L-N-PE). Check the ribbon cable connector on the basic module. Check the connected sensors and whether the dummy sensor needs to be con- nected (see Page 21). 12.3. Light cannot be dimmed To do this, the control unit must be set to FIN or HUM mode. Check that the external light switch (optional) is switched o昀昀 and/or that no light switch is connected (see Page 30). 12.4. Fuses Microfuses for the electronics and light (1AT) are located in the connection area of the basic module. They can be ordered using the item number PRO-FUSE (pack of 10). In order to replace the fuse, pull the fuse link straight out and insert the new fuse.
Page 38 Instructions for use for the user p. 38/40 12.5. Temperature correction It is possible to correct the displayed temperature value. This is possible within a range of -9 °C/+9 °C. The controller must be set to HUM mode for this. Press the Mode button until the temperature indicator lamp lights up. Press the Plus and Minus buttons simultaneously for 3 seconds. ► OFF 昀氀ashes in the display Press the ON/OFF and Mode buttons simultaneously for 3 seconds.
Page 39 Instructions for installation and use p. 39/40 13. Technical data Ambient conditions Storage temperature: -25 °C to +70 °C Air humidity: max. 95% non-condensing Power unit Dimensions (W × H × D): 320 x 220 x 110 mm Ambient temperature: -10 °C to +40 °C Voltage rating/three-phase 3N: 400 V AC Frequency: 50 Hz Power rating/heater: 3 × 3.7 kW Current rating per phase/heater: 16 A Power rating/vaporizer (optional): 3.0 kW Current rating/vaporizer (optional): 16 A IP code: IP65 Fuse: 1A T Connection to the mains supply as 昀椀xed wiring (昀椀xed connection) Control unit Connection cable: RJ10 – 4-core...
Page 40 1. Instructions for installation and use p. 40/40 Setting ranges Temperature: 30 °C to 110 °C Humidity: 30% to 99% 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. Thermal safety Heater sensor with overheat cut-out (139 °C cut-out temperature) Adjustable automatic heating time limit (1 to 12 hours)* Optional single-sensor mode or two-sensor mode Connection cables Sensor cables (temperature-resistant up to 150°C): 0.5 mm² Light cable: 1.5 mm² Fan cable: 1.5 mm² * EN 60335-2-53 speci昀椀es a heating time limit of 6 hours for private saunas. For saunas in hotels, apartment blocks and similar locations, a maximum heating time limit of 12 hours is permissible.

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Pro lt3 1-054-047 1-054-048