58
Multi-functional DC inverter air/water heat pump
GB
Electrical connection
3.4
DHW frost protection
3.5
Heating frost protection
3.6
Connection of electrical booster heater
Separate circuit breakers must be installed for all installations.
If the temperature in the DHW storage tank falls below +5 °C, the system will switch to
DHW frost protection automatically.
If the temperature rises above +15 °C or the circulation pump has worked longer than 30
minutes, DHW frost protection will be deactivated automatically.
E1L
E2L
A2
A2
A1
A1
E1N
E2N
L
L
N
N
If the heating flow or return temperature of the heat pump falls below the value of
parameter P25, heating frost protection will be activated. Depending on the outside air
temperature, one of the following actions will be started:
• At an outdoor temperature of ≤ +15 °C: compressor for heating will start
• At an outdoor temperature of ≥ +15 °C: water pumps C1 and C2 will start
If the heating flow temperature is higher than +10 °C or the circulation pump has worked
longer than 30 minutes, heating frost protection is deactivated.
If the heating flow or return temperature falls below +10 °C and the circulation pump has
worked longer than 30 minutes, the time calculation starts and records how often the
de-activating status occurs. If it occurs twice within 90 minutes, error code E24 appears.
In climate zones with the danger of frost, it is recommended to add glycol-based
antifreeze to the heating water to protect the heat pump. The reliability of frost
protection increases with a rising glycol content in the heating water. In most climate
zones, the efficiency of the heat pump is only marginally impaired by the use of antifreeze.
The graph shows the relationship of reliable frost protection, glycol content and efficiency.
Depending on the antifreeze used, the specified values can deviate. Please observe the
manufacturer’s specifications.
E1: Electrical booster heater for domestic hot
water (DHW)
E2: Electrical booster heater for heating water
Cut-out electrical supplier
3.4.1
A cut-out by the electrical supplier can be implemented via the “ON/OFF“ terminals.
