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- PV Off Grid | Battery Chargers
- Solar Thermal
Solar thermal systems
Solar thermal systems convert solar irradiation into heat so that it can be used to heat domestic hot water or for back-up heating.more
Along with the TR A501 T U and TR A502 TT U controllers, the TR A503 TTR U is the third product in this series, which have a compact designer housing allowing universal use.
The TR A503 TTR U extends the functionality of this series of devices by providing additional system monitoring functions. When used in conjunction with an external pressure sensor, the „System pressure monitoring“ controller function provides additional system monitoring. An additional controller output that can be individually customised for additional controller functions is also provided.
As with the other products in this series, a specially constructed switching power supply provides maximum efficiency and economic operation. This reduces own consumption to a minimum. The variable input voltage range allows universal use of the device worldwide.
The TR A503 TTR U has two speed-controllable Triac outputs, that can also be configured as 0-10 V outputs for controlling high-efficiency pumps and a relay switched output for additional controller functions. The equipment is rounded off by five inputs for recording temperature and pulses.
The integrated calorimetry system allows the acquisition of numerical information on the solar yields of the system. For more demanding requirements, this can of course be expanded using an external pulse encoder or an additional Grundfos Direct Sensors™.
Steca TR A503 TTR U controller monitors and controls solar thermal systems with two differently oriented collector arrays and a maximum of two domestic hot water or buffer storage tanks. The third controller output can be individually customised for additional controller functions.
Eleven pre-programmed systems enable universal usage. The Steca TR A503 TTR U also provides important monitoring and safety functions such as special error messages to quickly troubleshoot faults.
As with the other products in this series the new constructed electronic overloading control protects the TR A503 TTR U against overloading and installation errors.
|TR A503 TTR U|
115 V AC … 230 V AC, 50 Hz / 60 Hz
0.76 W [0.001 HP]
|Temperature control class|
|Number of inputs|
4 x temperature (Pt1000), 1 x temperature (Pt1000) or pulse
1 x Grundfos Direct Sensors™ (temperature / flow rate), 1 x Grundfos Direct Sensors™ (temperature / pressure)
|Number of outputs|
2 x triac for speed control (R1, R2), max. 130 W /0.17 HP (120 V AC) or 0-10 V control signal for pump speed (0-10 V R1, 0-10 V R2) / PWM control signal on request; 1 x switch output relay (R3), 2 A, 115 V AC … 230 V AC
1 x potential-free switching output for the safety extra-low voltage
0 °C [+32 °F] … +50 °C [+122 °F]
|Degree of protection|
IP 22 / DIN 40050 [without front panel: IP 20]
|Dimensions (X x Y x Z)|
110 x 160 x 51 mm [4.33 x 6.30 x 2.01 inch]
370 g [13.05 oz]