S -type control

S-type control is an elementary control system allowing the control of basic functions of the heater. To control efficiency of the fan, 5-stage or stageless rotation speed controllers have been applied. For the heating medium flow control, there is an option to use two- or three-way valves with a servo-motor connected with interior thermostats.

• Select the amount of devices that is appropriate for the heating power demand of the building 
• Additionally, choose the appropriate amount of mounting consoles for heater mounting at various angles (LEO FS has the console included) 

• for LEO EX the automatics is to be chosen individually

• The RD thermostat has a built-in programmable weekly calendar

• The control of fan rotational speed allows the adjustment of the amount of heat supplied into the room and reduces the noise generated

• SRV2d / SRS – cuts off the heating medium flow to the heater or to the whole zone
• SRV3d – cuts off the heating medium flow to the heater or to the whole zone simultaneously redirecting it to the return pipe

The interior thermostat
If the temperature falls below the user-given level it turns the device / valve servo-motor on, and turns it off once the level is reached. Because the temperature sensor is one of its components, it should be mounted in a place inside the room to be heated that is not be exposed to external factors that can disturb temperature measurement, (e.g. solar radiation). The RA interior thermostat can control a max. of 2 LEO, FL, FS, FB devices or one LEO AGRO device. The RA interior thermostat can control a max. of 10 SRV2d, SRS or SRV3d valves.

Supply voltage:  24 – 230 V/50 – 60 Hz
Temperature control range: od +10 do +30^oC
Working temp. range: od 0 do +40^oC
IP30 Degree of protection
Max load: 3 A
Mounting method: surface mount

The interior thermostat
This is used to keep the temperature at a programmed level. This makes it possible to set an hour-by-hour heat level for each day of the week. It allows the reduction of energy consumption costs because an appropriately programmed thermostat keeps the temperature at a comfortable level during operation hours. And out of operation hours a lower temperature can be maintained. The RD interior thermostat can control only one LEO family heater. The RD interior thermostat can control a max. of 10 SRV2d, SRS or SRV3d valves. 

Supply voltage: Batteries 2 x 1,5V AA
Temperature control range: from +5 to +28°C
Working temp. range: from 0 to +50°C
IP30 Degree of protection
Max load: 2 A
Mounting method: surface mount

5-stage rotational speed control of the fan
The transformer of rotation speed controller allows a 5-stage fan capacity control. The adjusted voltage thresholds ensure optimal heater operation in each gear. The TR Controller controls only one LEO heater (FL or FB), whereas the TRd a maximum of two. Together with the RA or RD interior thermostat it makes the basic system of heater operation control.

Power supply: 230 V 50/60 Hz
Control range: 5 stages
Working temperature range: from 0 to 40°C
Degree of protection: IP54
Max Current (depending on the version): 1.5 or 2.5 kg
Weight (depending on the version): 1.5 or 3 A
Method of mounting: surface mount

Stageless rotational speed controller of the fan
The stageless rotational speed controller of the fan allows smooth regulation within the full operation range. Together with the RA or RD interior thermostat it makes the basic system regulating heater operation.

Power supply: 230V/50Hz
Control range: Stageless 0 - 100%
Working temperature range: from - 10 to 50°C
Degree of protection: IP50
Max load power: 350 W
Max continuous current of operation: 1,5 A
Max momentary current: 2,5 A
Mounting method: surface mount

Two-way valve with servo-motor
An ON/OFF valve with a thermo-electric servo-motor, mounted at the point of water return from the exchanger, allows the heating medium flow to be cut off. It is fitted for cooperation and compatible with the RA, RD interior thermostat.

Power supply: 230V/50Hz
Max working pressure: 1,6 Mpa/16 bar
Max ambient temperature: 50°C
Max medium temperature: 130°C
Degree of protection: IP44
Max power consumption: 3 W
Max continuous current of operation: 0,014 A
Max momentary current: 0,6 A
Thread: 3/4"
Fully open – time: 150 s
KVS: 3,5

Three-way valve with servo-motor
An ON/OFF valve with a thermo-electric servo-motor, mounted at the point of water return from the heat exchanger. Allows the heating medium flow that feeds the heater to be cut off and simultaneously redirects the hot water stream directly to the medium return pipe. It cooperates with the RA, RD interior thermostat.

Power supply: 230V/50Hz
Max working pressure: 1,6 Mpa/6 bar
Max ambient temperature: 0°C
Max medium temperature: 1°C
Degree of protection: IP44
Max power consumption: 3 W
Max continuous current of operation: 1 A
Thread: 3/4"
Fully open – time: 150 s
KVS: 7