6
6.2 Water heater (Boiler)
The slot in heat pump WP2-AE is designed for water heaters with a standard flange
(Φ180 mm/8 hole). It is to be instaled on the side of the water heater.
6.3 Aditional electrical heater
Additional electric heater EG with power 1.3 kW is used for:
-
quick heating of the tap water
- simultaneous operation of the heat pump
and the electric heater.
-
protecting the evaporator -
if the ambient temperature is too low to allow
the operation of the heat pump, the additional heater is automatically
switched on when the pump operates in summer mode of operation.
-
alternative heating -
e.g. in case of malfunction of the aggregate.
6.4 Safety elements of the heat pump
Temperature feeler – protection against freezing
The heat pump incorporates a temperature feeler which is used to detect the
temperature of the air flowing through the pump. In case the air temperature is
below 7°C, the feeler switches off the operation of the pump for 30 minutes. With
heat pumps operating with an electric heater and summer mode of operation, the
pump automatically switches on heating as soon as the air temperature drops
below 7°C. When this air temperature is reached in winter mode of operation, the
circulating pump of the connected oil fired boiler is switched on.
Operating and safety thermostat of electric heater (only WPA 302 E-LF)
The electric heater incorporates an operating and safety thermostat limited to 65°C.
Caution!
When the electric heater operates, the water is always heated to approx.
65°C, since only the upper part of the hot water tank is heated. In such case, the
regulator does not display the actual water temperature, since the feeler is installed
in the bottom part of the hot water tank where the water temperature is lower.
Temperature control in the hot water tank
The OPTITRONIC regulator is installed in the heat pump to provide control and
heating of water to desired temperature.
Taking into account the selected water temperature, the regulator switches on and
off the operation of the compressor and the fan. Under specific conditions, the
regulator also switches on and off the electric heater or the circulating pump of the
oil fired boiler. The maximum adjustable water temperature is 55°C. After pressing
the 'HT' key, the water temperature rises to 60°C (overheating).
High pressure protection of the refrigerating system
In order to prevent high pressure in the refrigerating system and subsequently
damage to the compressor, a high pressure safety switch is installed to emergency
switch off the operation of the heat pump in case of high pressure. When the
pressure in the refrigerating system drops, the heat pump is automatically switched
back on.
