Heating operation mode [Alternating mode]
(When the heat load can be covered by the capacity of outdoor unit)
Heating operation mode [Combined mode]
(When the heat load cannot be covered by the capacity of outdoor unit)
100% of hot water from water heat exchanger goes to radiator.
Hot water in the tank is not used.
Water pump runs at constant speed set at commissioning.
When the water temperature in tank drops due to sanitary
water use, the operation is switched to Hot water operation
mode.
If the heat load is big and outlet water temperature of water
heat exchanger does not reach target water temperature, hot
water from water heat exchanger goes to tank partially and
hot water in the tank warmed with electric heater comes into
the radiator circuit in order to adjust the hot water temperature
to reach target water temperature.
Opening degree of 3-way valve is adjusted by watching
temperature with BT2.
Water pump runs at constant speed set at commissioning.
Counterow in water heat exchanger EP2
Counterow in water heat exchanger EP2
Principle of operation
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