Accessories + electrical diagrams

Forced convection

FORCED CONVECTION – REGULATION and ACCESSORIES

Regulation of the heating or cooling medium flow forms a central role in the correct control of convector heating output. Correct selection of regulation elements guarantees a comfortable ambient temperature and contributes to heating cost minimalization. Fans and thermoelectric actuators are powered by 24 V DC and the fan speed is operated by 0-10V control voltage.

KORAFLEX FVO, FVE, FVP, F2V and F4V
KORAFELX FVA
KORALINE LVO
KORAWALL WV

Technical data Demand

Regulation is designed for all model lines with natural convection:
Outside temperature varies continuously during the heating period. Regulation elements are installed to the heating system to meet your desired ambient temperature and to eliminate the negative impact of outside temperature changes. Thanks to well-designed regulations the KORAFLEX, KORALINE, KORAWALL model lines achieve optimal heating efficiency and considerable financial savings.

Standard contents

Optional accessories

A set of EC fans with synchronous motor in an aluminium frame.
Featuring very low power consumption and very quiet operation.
FCR-BOX electronic regulator which functions as a terminal block
or connecting the cable from the power supply, thermostat
or BMS and the fan. Ensures smooth operation of the fan at
therequired speed and independent control of thermoelectric actuators
for heating and cooling.
KORAFLEX Energy FVE models are fitted with switching
230 V AC / 24V DC power supply and a terminal block for connecting
230 V AC from the grille.

230 V AC / 24 V DC power supply according to the maximum
power consumption of the trench heater. Five types of power
supply units are available for 60 W, 100 W, 150 W, 240 W and
480 W. Power supply units are supplied separately for mounting
on the distribution board DIN rail assembly
Junction box. For mounting HDR-60, HDR-100 and HDR-150
power supply units.
SIEMENS 24 V DC RDG 260T, RDG 260KN or HY607LIC thermostats
24 V DC Thermoelectric actuator, thermostatic valves, lockshield.

Installation must be carried out in accordance with valid regulations and safety procedures! The manufacturer cannot be held liable for any defects, damages and injuries caused by improper installation.

RAB 21-DC or RDG 260T thermostat function description

Trench heater output is controlled by fan speed and the flow of heating/cooling medium through the exchanger. The control voltage is 24 V. The RAB 21 DC or RDG 260T Siemens thermostats control the heating medium valve with a thermoelectric actuator and in addition control fan speed with a control voltage of 0–10V DC. Fan speed may be controlled automatically by the thermostat, or manually in three speed settings. The speed rating is set at a control signal size of 7 V. Fans start rotating when the temperature of the heating medium exceeds 37 °C. For cooling trench heaters, it is recommended to use a second temperature sensor, actuated when the temperature drops below 15 °C. Temperature sensors are available as optional accessories.

Function description with BMS (Building Management System)

The BMS central control system may be used to control trench heaters. One BMS control output directly controls the opening/closing of valves and the other 0–10 V DC output controls fan speed. The rated heat output of trench heaters is achieved at 7 V DC. Valves and fans are supplied with 24 V DC.

Using the KNX system, trench heaters may be controlled with the RDG 260KN thermostat. The thermostat communicates with the KNX system, which transmits and receives data for the trench heater.

Information on individual model lines

KORAFLEX Pool-V (FVP)
For KORAFLEX Pool-V humid environment trench heaters, the standard control system description applies. The difference lies in placing the FCR-BOX in a pattress box with a higher degree of protection. The fan is equipped with stainless steel casing and its electronics are protected against splashing water. For this model, we recommend using a temperature sensor that monitors the temperature in the pool area. The sensor is designed for RDG 260T thermostats. The trench heater is not designed to be permanently flooded with pool water. Please familiarise yourself thoroughly with the warranty conditions and conditions of use.

KORAFLEX Energy (FVE)
It is powered by 230V AC mains voltage. The switched-mode power supply is situated inside the convector and converts mains voltage to 24 V DC. Fan speed is controlled by 0–10 V DC controlled voltage either from the BMS or the thermostat. Electrical installation design must be carried out by a suitably qualified person and must comply with relevant regulations. Installation and maintenance of the electrical installation must be carried out by a qualified electrical technician. Prior to commissioning, an inspection and testing of the electrical installation must be carried out in accordance with ČSN 33 1500. KORAFLEX Energy FVE convectors are powered with 230V alternating current mains electricity. Therefore the electric branch must be equipped with a residual current device with a tripping current of 30 mA. These trench heaters are to be used solely in dry environments, and only for heating.

KORAFLEX Amper (FVA)
The KORAFLEX Amper FVA electric convector is controlled by a control voltage of 0–10 V DC via a thermostat or a master BMS system. The control voltage determines the heater performance and the fan speed. The power supply of the heater is 230 V AC and is delivered via an IP 65 electrical box. The fans have a safe 24 V DC power supply. In the event of a fan failure, the electronics will shut off the power to the heating rod. In the event of an electronic failure, safety is ensured by a safety shut-off sensor. An additional control sensor makes sure that the temperature of the grille does not exceed the ambient temperature by more than 45 K. The grille is fixed to the convector with screws for safety reasons.

KORAWALL Optimal-V (WVO) and Pool-V (WVP)
Regulation elements are identical for all forced-convection products (OC systems). We recommend equipping the convector with the LM regulation valve with a higher flow rate.

Wall-mounted convectors KORAWALL Direct WVD (24V DC)
Do not forget about the power source nearby installation. Connection to the mains is via a 24 V DC socket adapter. KORAWALL WVD we recommend equipping with the LM regulation valve with a higher flow rate. The convector is equipped with an autonomous control with an integrated keypad, allowing fans to be controlled directly on the unit.

Wall-mounted convectors KORAWALL Energy WVE (230V AC)
Do not forget about the power source nearby installation. Connection to the mains is via a ready-to-use terminal block, securely incorporated inside the heater. KORAWALL WVE we recommend equipping with the LM regulation valve with a higher flow rate. The convector is equipped with an autonomous control with an integrated keypad, allowing fans to be controlled directly on the unit.

ACCESSORIES

Lockshield

optional accessory
KORAFLEX FV, KORALINE LV,

• straight or elbow
• size ½" G
• nickel brass
• max. operating pressure PN 10
• max. operating temperature 90 °C

• order code:
straight lockshield: REG-LS
corner lockshield: REG-LA

Thermostatic valve

optional accessory
KORAFLEX FV, KORALINE LV,

• elbow or straight
• pre-set value Kv
• size ½" G
• thread: M 30×1.5
• nickel brass
• max. operating pressure PN 10
• max. operating temperature 90 °C

• order code:
straight thermostatic valve: REG-TVS
axial thermostatic valve: REG-TVA

Regulation fitting connection LM valve optional accessory KORAWALL : Optimal-V WVO, Pool-V WVP, Direct WVD, Energy WVE • thermostatic and control fitting • maximum operating pressure 10 bar • maximum operating temperature 120 °C • control KV • connection thread to body G ½", to the heating system G ¾" • connection for actuator M 30 × 1.5 • axial connection distance 50 mm • material: nickel-plated bronze LM-valve straight order code: REG-TMS LM-valve elbow order code: REG-TMA	LM-valve straight LM-valve elbow In order to ensure heat output, we recommend incorporating an LM regulation fitting. This fitting achieves a greater flow.
Axial thermostatic valve optional accessory : *KORAFLEX FV* • maximum operating pressure: PN 10 • maximum operating temperature: 120 °C • connection type: M 30 × 1.5 • connection – pipes: 1/2" • connection – body: 1/2" – O-ring seal • Kvs value: 1,08 k • order code: REG-AVP
Brass elbow optional accessory KORAFLEX FV • ½"×½" 90° without rim • order code: REG-E90
Stainless steel flexible hoses optional accessory KORAFLEX FV • stainless steel welded hose • lengths 10, 12, 20, 30 cm • end fitting with internal thread G½ (flat seal) • end fitting with external thread R½ (thread seal) • max. temperature 180 °C • PN 10 • order code (10 cm): REG-N10 • order code (12 cm): REG-N12 • order code (20 cm): REG-N20 • order code (30 cm): REG-N30
DC power supply 60 W, 100 W, 150 W, 240 W and 480 W optional accessory KORAFLEX FV, KORALINE LV, KORAWALL WV • switch-mode DC power supply • silent operation, high efficiency • DIN rail assembly • IP 20 • order code: REG-PS60, REG-PS100, REG-PS150, REG-PS240, REG-PS480	We recommend the output of the power supply is at least 20% more than the resulting sum input of the actuators for this power supply.
Thermoelectric actuator TEP 24 optional accessory KORAFLEX FV, KORALINE LV, KORAWALL WV, • IP rating IP 44 • reset time 4 min • unit height 65 mm • M 30×1.5 thread • cable length 1, 3 and 5 m • closed without voltage TEP 24 power supply 24 V DC power consumption <2 W • order code (1 m cable): REG-TEP24-100 • order code (3 m cable): REG-TEP24-300 • order code (5 m cable): REG-TEP24-500
R-Box optional accessory KORAFLEX FV, KORALINE LV, KORAWALL WVO and WVP, • combined with the power supply it creates the control voltage for the fan •for use with a thermostat with a supply voltage of 230 V AC (such thermostat is not offered by LICON) • 3 programmable speed settings • input voltage: 230 V/50 Hz • output signal: 0 to 10 V/1 kΩ • 4 kV AC galvanic isolation optocouplers • IP 30 • mounted on DIN rail on the distribution board • ambient operating temperature: 0–40 °C • dimensions (w×h×d): 70×58×90 mm • order code: REG-RBOX17
Junction box optional accessory KORAFLEX FV, KORALINE LV, KORAWALL WV, • embedded in wall • for installation of AC power source (60 W, 100 W and 150 W) • IP 40 • dimensions (w×h×d): 318×258×72 mm • order code: REG-IB
SIEMENS RAB 21-DC Manual room thermostat optional accessory KORAFLEX FV, KORALINE LV, KORAWALL WV, • for 2-pipe heating systems • manual 3-speed fan switch • heating or cooling model • 24 V DC, electrical consumption: 1 W • 0–10 V DC EC fan • setpoint setting range 8 – 30 °C • switching differential <1 K • IP rating IP 30 • dimensions (w×h×d): 96×110×36 mm • order code: REG-RAB21DC	For correct operation, RDG260T or RDDG260KN thermostats must be set according to the LICON instructions included in the thermostat package. The thermostat is supplied pre-set for heating in a 2-pipe system.
Electronic room thermostat with touch LED display HY607LIC optional accessory KORAFLEX FV, KORALINE LV, KORAWALL WV, • 24 V DC power supply • control signal for the EC fan 0–10 V DC • weekly program with three time blocks 5+2, 6+1, 7 • operating modes: manual, automatic (weekly program) • possibility of automatic switching – heating, cooling, ventilation • automatic or manual fan speed control in 3 steps • control via a Wi-Fi application using an Android or iOS smartphone • temperature setting range 5–50 °C • operating environment -10 to 60 °C • accuracy 0,5 °C • dimensions w × h × d: 86 × 86 × 16 mm Function description of the thermostat The control voltage is 24 V. The HY607LIC thermostat control the heating medium valve with a thermoelectric actuator, and in addition control fan speed with a control voltage of 0–10 V DC. Fan speed may be controlled automatically by the thermostat, or manually in three speed settings. Recommended installation The HY607LIC thermostat is designed for semi-recessed wall mounting. For easier cable connection, we recommend using an electrical installation box with dimensions of 68 × 70 mm (e.g., KRP 68-70_KA). • order code (white): REG-HY60724W • order code (black): REG-HY60724B	NEW 2025
SIEMENS RDG 260T electronic room termostatwith LCD display optional accessory KORAFLEX FV, KORALINE LV, KORAWALL WV, • for 2 and 4-pipe heating systems • 7-day time program with 8 programmable timers • automatic or manual heating/cooling changeover • manual or automatic 3-speed fan control • operating modes Comfort, Economy and Protection • three input slots for separate sensor, card reader, motion sensor, etc. • timer back up (minimum 20 hrs) • operating voltage 24 V DC, power consumption 4 W • 0–10 V DC ECM fan • setpoint setting range 5 – 40 °C • switching hysteresis can be set differently for heating and cooling in the range of 0.5 to 6 K • IP rating IP 30 • dimensions w×h×d: 92×134×25 mm • can be commissioned using the SIEMENS PCT Go mobile application • order code: REG-RDG260T	Accessories • can be combined with separate QAA32 room temperature sensor (NTC 4 kΩ), e.g. for thermostat placement outside public areas or in humid environments
SIEMENS RDG 260KN electronic room thermostat with LCD display optional accessory KORAFLEX FV, KORALINE LV, KORAWALL WV • regulation of ambient temperature and relative humidity • for 2 and 4-pipe heating systems • power indicator function for energy-optimised system operation • built-in relative humidity and temperature sensor • KNX (S-mode and LTE-mode) for integration into BMS • 7-day program with up to 3 temperature-setting periods per day • automatic (continuous) or manual (3-level) fan speed regulation • Comfort, Economy and Protection operation modes • 3 multifunctional inputs (window contact, motion detector, access card reader, heating/cooling switch...) • operating voltage 24 V DC, power consumption 4 W • EC fan control voltage 0–10 V DC • setpoint setting range 5–40 °C • adjustable hysteresis switching differential 0.5–6 K • IP rating IP 30 • wall mounting with base mounting plate • dimensions (w×h×d): 92×134×25 mm • order code: REG-RDG260KN	Accessories • can be combined with separate QAA32 room temperature sensor, eg. for thermostat installation out of publicly accessible space or for installation in humid environments • For correct operation, RDG260T or RDDG260KN thermostats must be set according to the LICON instructions included in the thermostat package. The thermostat is supplied pre-set for heating in a 2-pipe system.
QAA32 external room temperature sensor optional accessory KORAFLEX FV, KORALINE LV, KORAWALL WV, • for measuring temperature in heating systems where a thermostat cannot be placed in the room • suitable for installation at swimming pools • can be combined with RDG 260T and RDG 260KN • setpoint setting range: 0–40 °C, accuracy at 25°C: ± 0.3 K • NTC sensor, 3 kΩ at 25 °C • IP rating IP 30 • dimensions (w×h×d): 96.4×99.6×36 mm • order code: REG-S-QAA32
Thermostatic head (heating/cooling) optional accessory KORAWALL Direct WVD, Energy WVE • VT-score 0.20 • hysteresis 0,15 K • heating/cooling 6–28 °C • minimum tempering 8 °C • max. temperature lock • M 30 × 1.5 thread • max. water temp 120 °C • TELL-score (Thermostatic Efficiency Labelling) A • order code: REG-TCW