Datasheet

TR A502 TT
System voltage 115 V AC ... 230 V AC, 50 Hz / 60 Hz
Own consumption ≤ 0.8 W
Inputs 5
4 x temperature (Pt1000)
1 x temperature (Pt1000) or pulse
Outputs 2
2 x triac for speed control (R1, R2),
max. 250 W (230 V) or
PWM control signal for pump speed (PWM R1, PWM R2)
Additional output 1 x potential-free switching output
for the safety extra-low voltage
Hydraulic schemes 11
Ambient temperature 0 °C ... +50 °C
Degree of protection IP 22 / DIN 40050 [without front panel: IP 20]
Dimensions (X x Y x Z) 110 x 160 x 51 mm
Weight 350 g
Technical data at 25 °C / 77 °F
12 140
51
110
160
Steca TR A502 TT
5 inputs, 2 outputs
The Steca TR A502 TT controller is an ideal solution for all double-
circuit systems. It monitors and controls solar thermal systems with
up to two differently aligned collector arrays or a maximum of two
domestic hot water or buffer storage tanks.
The Steca TR A502 TT is also distinguished by the compact casing,
which is typical for this series of devices. It can be superbly integra-
ted into solar stations, but of course it can also be installed on walls
or top-hat rails. The variable input voltage range allows universal use
of the device worldwide.
The solar controller has five inputs for acquisition of temperature
and pulse information and two outputs. These can also be used for
controlling high-efficiency pumps. The device is equipped with an
additional alarm output. The operating states are visualised on an
animated, clearly arranged display.
Together with an external pulse encoder, the integrated calorime-
try system allows the acquisition of numerical information on the
solar yields of the system.
The controller can be used in a wide range of applications and is
exceptionally easy to configure and operate: 11 system configura-
tions are pre-programmed. The inputs and outputs are already de-
fined and you can see what is connected at a glance. Installers only
need to set the boundary parameters. The system setting ”0.1” al-
lows free selection of the controller functions to suit the system type
and operating requirements. The ability to be mounted on a wall
or top-hat rail emphasises the flexible range of uses for the device.
The specially constructed switching power supply in the Steca TR
A502 TT, which is used in all controllers of this series, ensures the
maximum possible efficiency and economic operation.
The new electronic load control system protects the device from
overloading and installation errors. This ensures long-term, safe and
reliable operation of the entire solar system.
The Steca TR A502 TT also provides important system monito-
ring and safety functions. This ensures long-term, safe and reliable
operation of the entire solar system. For rapid correction of system
malfunctions special error displays are shown.
Product features
∙ Compact, multipart designer casing
∙ Installation versions: Solar pump stations, wall installation,
mounting rails
∙ Wave packet (Triac) and pulse width modulation (PWM) ensure
electronic RPM control
∙ High level of operational safety through fault diagnosis
∙ Hours-of-operation logger
∙ Software update possible
∙ Daily pump start
∙ Screw terminals allow universal and rapid installation
∙ Low power consumption thanks to universal and wide-range
switched-mode power supply
∙ Variable input voltage range for worldwide controller deployment
∙ Electronic overloading control and protection
Displays
∙ Multifunction graphical LCD display with backlighting
∙ Animated representation of the systems and operating states
Operation
∙ Non-verbal menu navigation
∙ Manual switch for manual, auto, off
Functions
∙ Heat quantity (pulse generator, determination)
∙ Display showing CO
2
savings
∙ Reduction of stagnation phases
∙ Active cooling (e.g. to avoid stagnation)
∙ Holiday (storage tank recooling)
∙ Circulation (controlled by temperature / time)
∙ Back-up heating
∙ Solid fuel boiler
∙ Storage tank quick charge
∙ Thermostat
∙ Differential thermostat
∙ Interval / tube collector
∙ Anti-freeze
∙ Display storage tank top
∙ Alarm output
Areas of application:
inputs/outputs:
SOLAR CONTROLLERS
5 2