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Control unit Rego 603
The control unit Rego 603 is the brains of the Optima heat pump. It makes
sure the heat pump gives the best energy savings and that it runs for many
years. The control unit controls and monitors the heating and hot water
supply in your house. The monitoring function is especially important. It
shuts down the heat pump in the event of operational disturbances so that
no critical parts are damaged.
Additional heat gives more output
Additional heating is required when the heat pump is unable to meet the
heating requirements or when it has stopped at a temperature lower than
approximately -10ºC. The additional heat is provided by an electric/oil-fi red
boiler or an electric cassette that can be connected to the control unit and
which is automatically started and stopped when necessary. Note that
when the heat pump is running, the additional heat source only supplies
the power that the heat pump cannot produce. When the heat pump is once
more able to meet the heating demand, the additional heat is automatically
switched off.
Hot water is given priority over heating water
The heat pump can produce hot water when a hot water heater is connected
to the system. In a house with water based heating a difference is made
between heating water and hot water. The heating water is for radiators/
fl oor coils and hot water is for showers and taps. Hot water is heated in a
hot water heater. The hot water heater is fi tted with a sensor that senses
the temperature of the hot water. The heating water passes through the hot
water heater's outer shell and heats up the hot water heater's inner tank.
The control unit makes sure the heating of hot water is always given priority
over the heating of the heating water. This means you never need to be
without hot water. The control unit controls a three-way valve that alternates
between heating the heating water and hot water. Once the hot water
has been heated the three-way valve switches so that the heating water is
heated.
Automatic defrosting
Ice forms on the evaporator at outdoor temperatures below +5ºC. When
ice forms to an extent that it obstructs the air fl ow through the evaporator
automatic defrosting starts. Defrosting is controlled by a four-way valve.
The valve reverses the fl ow of the refrigerant in the circuit so that the hot
gas melts the ice on the evaporator fi ns. See the fl ow of the refrigerant
through the heat pump when defrosting in the fi gure under the heading
How a heat pump works.
Hot water
Heating water
During defrosting, the air from the
fan-assisted radiator may seem cold.
This is perfectly normal.
9
Control unit Rego 603
Electric cabinet
Control unit Rego 603
Double-shelled hot
water heater
Note
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