N
The outside air temperature reference point for the heat curves is -6 °C.
Cooling
When the function is manually set to cooling, the machine will lower the indoor temperature. Note that the cooling capacity will de-
crease as the outdoor temperature increases.
Adjustable cooling supply line temperature range: 8-18 °C.
If the supply line water temperature drops below 2 °C the machine will stop. This to prevent inside components from freezing.
Error code 13 will be displayed.
Domestic hot water
The prioritized function is Domestic Hot Water (DHW). When the water temperature reaches the set point, the heat pump automatically
switches to house heating.
Defrosting
The heat pump will calculate and process the best defrosting programme depending on data collected from the temperature sensors.
During defrosting, components will start and stop at intervals (this is normal behaviour).
Defrosting can also be activated manually, this is only recommended when AUTO defrosting is not sufficient. This usually happens in the
temperature interval -5 to +5 °C and when outside air humidity is high. Under these conditions can heavy icing occur.
Legionella prevention
There is an automatic legionella prevention when the heat pump function is set to DHW. The automatic legionella prevention runs at
00:00 every 7:th day of operation. The water in the hot water tank will be heated to 65 °C for 15 minutes, using the hot water tank
electrical heater. This will kill any possible legionella bacteria inside the hot water tank.
3.3
Internal electrical heater
The internal electrical heater is used in situations when the heating from the heat pump is insufficient due to low air temperature or
when the heat pump itself has stopped.
The electrical heater will start in the following conditions:
▪
The system discovers insufficient heating from the heat pump.
▪
The heat pump stops (for protection) due to a failure, and at the same time, the water temperature has not reached the set point.
▪
The heat pump is in defrosting mode.
▪
During freezing protection, step 2.
3.4
Freeze protection
As long as there is power supplied to the heat pump, an automatic freeze protection function will prevent inside components from
freezing.
When this protective function is triggered, the controller will display either "Err 18" or "Err 19" depending on the temperature in the
system, this is not a fault. The unit will automatically recover once the conditions in the control system is met.
User Guide
DHP-AT
VUGFC20202
Danfoss Heating Solutions
8
