Technical data

SOLAR
THERMAL
SOLAR
THERMAL
170
170
46
WT
HR increase
Boiler
kWh
Collector 2 st. tank East-West
1 st. tank
Collector 1 st. tank
BHF
76|
Steca Elektronik GmbH | 87700 Memmingen | Germany | Fon [phone] | Fax [phone] | www.stecasolar.com
|77
Steca Elektronik GmbH | 87700 Memmingen | Germany | Fon [phone] | Fax [phone] | www.stecasolar.com
1-storage-tank systems
Steca TR 0502
The new TR 0502 solar thermal controller closes the gap
between the already successful TR 0301, TR 0301sc and
TR 0603 temperature differential controllers. With its
animated graphic display and elegant design, it continu-
es the success enjoyed by this family of controllers. This
controller provides everything your solar thermal system
requires for safe and durable operation. The controller
TR 0502 is used for monitoring and controlling of solar
thermal energy systems having two differently aligned
collector arrays or a maximum of two domestic hot water
and buffer storage tanks. The large display panel shows
the animated control circuits, which allow you to view
the operating conditions of each system. The clearly ar-
ranged display ensures easy operation using pictograms.
Pre-programmed plant systems enable universal usage.
The TR 0502 controller also has 5 inputs for recording
temperatures or pulse values, as well as 2 speed-control-
led outputs for controlling pumps or switching valves.
INPUTS
5
OUTPUTS
2
Temperature Differential Controller
TR 0502
System voltage 230 V (± 15 %), 50 Hz
[optional 115 V (± 15 %), 60 Hz]
Max. own consumption ≤ 3 W
Inputs 5
4 x temperature recording (Pt1000),
1 x temperature recording or pulse
Additional input 1 x ”Direct Sensor“ (temperature/flow rate)
Outputs 2
1 x relay switched output,
1 x triac output for speed control
Additional output 1 x alarm output
Number of pre-defined hydraulic
schemes
14
Interfaces RS232
Permitted ambient temperature 0 °C ... +45 °C
Display animated graphic LCD with 2 colour backlight
Protection degree IP 20/DIN 40050
Weight 450 g
Measurements l x w x h 170 x 170 x 46 mm
Display examples
The display examples shown here are merely a selection, designed to show
the many and diverse function displays of the TR 0502 controller.
Graphic display
The new TR 0502 solar thermal controller is also equipped
with the fully animated graphic display. With this display, Ste-
ca has managed to represent the different system layouts and
numerous functions in a clearly laid out display that is easy to
understand. This is supported by the ability to display informa-
tion in a number of different languages. Apart from the usual
high quality of all Steca products, the strength of this control-
ler lies in the ease of use and the high level of functionality.
Features
Backlight LCD-Display showing animated representati-
on of the systems and their operating status
Selectable limitation of storage tank temperature
Targeted storage tank loading
Heating return increase
Freely programmable thermostat
Freely programmable differential thermostat
Timer functions
Calorimetry
Back-up heating function
Circulation function
Solid fuel boiler back-up heating
Tube collector function
Holiday (storage recool) function
Anti-freeze function
High degree of operational safety through
fault diagnosis
Selectable storage tank loading strategies
Interval function
Rapid storage tank loading
Reduction of system stagnation phases
Daily pump starts
Multilingual menu navigation





















Casing design
The casing was jointly designed with
the internationally renowned design
centre "Busse-Design". The well thought-out
case allows easy installation and is particularly service-friendly.
INPUTS
5
OUTPUTS
2
with external heat exchanger
2-storage-tank systems

    
System with 2 storage tanks
and valve control

    

System with 2 storage tanks
and pump control

    
System with 1 storage tank

    
System with heating return increase
and storage tank
    

System with zone loading and
1 storage tank
   

     
System with east/west roof, 1 storage tank
and valve control
 

  
System with 1 storage tank and
external heat exchanger
System
examples
Technical data
Temperature
Differential
Controller
Temperature
Differential
Controller

Systems
)XQNWLRQHQ)XQNWLRQHQ)XQNWLRQHQ)XQFWLRQV
&LUFXODWLRQ
4XLFNFKDUJH

+HDWTXDQWLW\
9
.:K
7
7
'LIIHUHQFH7KHUPRVWDW
(QJOLVK