STIEBEL ELTRON accelera 220 e Operation And Installation Manual page 13

OPERATION
Settings
5.2.2 Actual temperature display
In the mixed water menu, press the
menu key once to get to the actual tem-
perature menu.
The current actual temperature in
the upper section of the DHW tank is
shown. This largely corresponds to the
outlet temperature.
5.2.3 Set temperature 1
Note
For reasons of legionella prevention, never set the DHW
temperature lower than 124 °F (50 °C).
Set temperature 1 is the default DHW temperature the appliance
heats to. Set temperature 1 is set to 131 °F (55 °C) at the factory.
Set temperature 1 is active if no external signal transmitter is
connected and active (See 5.2.5, "Set temperature 2", pg. 13)
In the actual temperature menu, press
the menu key once to get to the menu
for set temperature 1.
The set temperature 1 symbol appears.
Adjust set temperature 1 from 69–149 °F
(20.5–65 °C) using the plus and minus
keys.
Note
Another way to adjust set temperature 1 is to press the
plus or minus key when in standard display (amount of
mixed water).
5.2.4 Freeze protection
If the water temperature in the tank is below 59°F, the heat pump
and the electric element activate as a freeze protection measure.
This mode deactivates once the water temperature reaches 65°F.
If the set temperature is set to less than
69 °F (20.5 °C), only freeze protection re-
mains active. The water heater will not
run.
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5.2.5 Set temperature 2
Note
For reasons of legionella prevention, never set the DHW
temperature lower than 124 °F (50 °C).
Set temperature 2 is the DHW temperature to which the appliance
heats if an external signal transmitter is connected and active.
In the set temperature 1 menu, press
the menu key once to get to the menu
for set temperature 2.
The set temperature 2 symbol appears.
Adjust set temperature 2, from 69–
149 °F (20.5–65 °C) using the plus and
minus keys.
Operation with external signal transmitter (240 V input)
The connection of the heat pump to an external signal offers the
possibility of heating water to a raised temperature set point
during periods when electric rates are favorable, for example
during times when PV power is available or low tariff utility rates
are in effect.
The external signal may be offered by a PV system or off-peak
electricity rates of a utility.
If an external signal is received, set temperature 2 becomes active,
overriding set temperature 1, the standard set DHW temperature.
If set temperature 2 has been activated by the external signal
transmitter, this set temperature will then be active for at least
20 minutes. If the signal remains active after those 20 minutes
passed, the compressor will run until the external signal. If not,
the selected set temperature 1 is activated again.
If the relevant set DHW temperature is accomplished, the com-
pressor switches off and remains off for a minimum idle time of
20 minutes.
The following diagram illustrates the connections by means of a
sample signal sequence of an external signal transmitter.
Example:
- DHW temperature = 131 °F ( 55 °C)
- Set temperature 1 = 124 °F ( 50°C)
- Set temperature 2 = 149 °F ( 65°C)
A
240 V
0 V
0 5 10 15 20 25 30 35
B
On
Off
0 5 10 15 20 25 30 35
A LF signal
B Compressor
1 20 min. minimum runtime, set temperature 2
2 20 min. minimum compressor idle time
40 45 50 55 60 65 70 75 t [min]
40 45 50 55 60 65 70 75 t [min]
Accelera® 220-300 E |
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