| Simple solar controller with relay or triac output The ESR21-R or ESR21-D unit is a single circuit di erential controller. Due to the wide control range, a large number of applications are possible: service water and swimming bath solar systems, boiler charging, fan control, burner requirement via holding circuit, air damper control of ground collectors using a temperature window, etc. Features: - 1 relay or triac output
- Each with a di erence, minimum and maximum function
- All switch-on and o points separately adjustable
- Clear display with symbols
- Status display for immediate recognition of exceptional conditions
- Solar start function, frost protection function
- Pump blocking if a collector overtemperature exists
- Heat quantity counter
- DL-BUS (for temperature evaluation at the PC via D-LOGG or BL-NET and for connection of external
- sensors)
- Speed control (only for ESR21-D)
- Suitable for KTY and PT1000 sensors
- Controller function is selected by program number
| Differential temperature: | adjustable from 0 to 99 °C | | Minimum / maximum threshold values: | adjustable from -20 to +150 °C | | Accuracy: | typ. ±2% | | Operating voltage: | 230 V AC 50-60 Hz | | Power consumption: | max. 3 VA | | Rated current load: | max. 1.5 A resistive-inductive cos phi 0.6 | | Fuse: | 3.15 A quick-blow (unit + output) | | Transformer: | short-circuit proof | | Protection class: | II - protective insulation | | Protection degree: | IP40 | | Dimensions (W/H/D) | 152 x 101 x 48 mm | | Weight: | 210 g | | Permissible ambient temperature | 0 to 45 °C |  Program 0:
The solar pump runs when S1 has a temperature of diff higher than S2 and S2 has not xceeded the threshold max. In addition, the pump’s protective function takes effect: During a standstill, steam can occur
in the system. When automatically switched on again, the pump does not have the required ressure in the steam phase to lift the fluid level to the collector’s supply line (highest point in the system). This represents a considerable load on the pump. The collector’s excess temperature shut-down function can be used to block the pump whenever a certain temperature has been reached at the collector’s sensor until a second threshold, which can also be set, is fallen short of again. The settings ex works are 130°C for the blockage and 110°C for the release. |  | Program 1:
With this program, the solar thermal system has an additional storage limit max2 via sensor
S3. There is no guarantee that the actual storage temperature will lead to a cutoff in time,
especially if the reference sensor S2 is installed at the return outlet for the heat exchanger. | |
| Program 4 The loading pump runs when S1 has exceeded the threshold min, the temperature of S1 is diff higher than S2, and S2 has not yet crossed the threshold max. |  | | Program 5 The loading pump function has an additional storage limiter max2 via sensor S3. | | Program 6 The loading pump function has an additional threshold min2 via sensor S3 and temperature difference diff2 between S3 and S2. Hence, the system can be switched off via two energy generators (S1 and/or S3). | Program 8
The output switches when S1 < max or > min. An air/water heat pump thus has a flap for
the airflow from the earth collector above the outside ambient temperature min (regeneration)
and below the outside ambient temperature max (heating). S2 and S3 have no function. | Program 9
The output switches when S1 > max or < min. Hence, while program 8 switches above
and below a temperature window, program 9 switches within a temperature window. |
| The output switches on when S2 < min and off when S1 > max. In other words, boiler requirement hen S2 falls short of min in the upper storage area and switch-off when S1 exceeds max in the lower part of the tank. |  | Program 16 (only for speed version V D)
By using the speed control the heat exchange outlet can be kept permanently at a constant temperature via the ultrafast sensor S2 (non-standard accessory). Low stand-by losses may occur. A volume flow switch S3 is not necessary. |  | Program 17 (only for speed version V D)
The speed control is only activated, if the volume flow switch S3 (non-standard accessory)
indicates a flow. Very few stand-by losses may occur. When starting, the system is a little
lazier and a volume flow switch is necessary. | |
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15.03.2012 
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833.19 KB 621
