Technical data

ABOUT THE APPLIANCE
6 720 803 687 (2012/11) 7
2.8 FUNCTION DESCRIPTION OF THE HYBRID MANAGER
The hybrid control module monitors the external unit, the condensing
boiler and the FW200 programming unit. Subject to outside
temperature, heating water flow and return temperature and the
primary flow temperature, the hybrid control module determines what
proportion of the total energy to be expended should be covered by the
condensing boiler and the external unit respectively. This process
optimises the efficiency of the heating system.
The hybrid control module delivers the control signal at the interface to
the air to water heat pump. This modulates the output of the external unit
subject to the current heat demand.
A hydraulic separator is integrated into the hybrid manager and
separates the condensing boiler and heating circuits. Thus, the heating
water, after flowing through the hybrid manager, can be either routed
through the condensing boiler or returned into the heating system.
A high efficiency (HE) pump integrated in the hybrid manager provides
the heating water circulation through the hybrid manager. The hydraulic
separator integrated into the hybrid manager also enables the HE pump
operation in the hybrid manager when the pump inside the condensing
boiler is not running.
The pump inside the condensing boiler and the HE pump in the hybrid
manager run simultaneously if the condensing boiler operates on its own
or at the same time as the air to water heat pump.
If only the air to water heat pump is in operation, then only the HE pump
in the hybrid manager runs.
The filter protects the plate heat exchanger (condenser) inside the
hybrid manager and the heating system from contamination through
small particles with a diameter larger than 1 mm.
A flow switch with magnetic reed switch ensures that the external unit
operates only if the water flow rate is adequate for the plate heat
exchanger (condenser).
The heat exchange between the refrigerant (R410A) and the heating
water takes place inside the copper-brazed stainless steel plate heat
exchanger (condenser).
One temperature sensor each is located at the plate heat exchanger inlet
and outlet to protect the heating water from excessively high
temperatures during heating operation by the external unit and against
freezing when the external unit is being defrosted. The heat transfer
between the refrigerant(R410A) and the outside air takes place inside
the heat exchanger of the external unit (evaporator).
The buffer tank provides two functions: Firstly, the buffer tank ensures
that there is always sufficient heat energy within the heating system in
order to support the Heat Pump Defrost operation. Secondly, the buffer
volume prevents excessive heat pump cycling during low heat load
conditions. This optimises system efficiency and reduces excessive
wear on heat pump components.
BYPASS VALVE (OVERFLOW VALVE)
This function is particularly important during automatic defrosting.
The bypass valve begins to open when the heat demand has been
reached and the thermostatic valves reach their closed position. The
heating water flows through the bypass valve and so safeguards the
required minimum heating water flow rate through the hybrid manager.
2.9 HANDLING CIRCUIT BOARDS
Circuit boards with control electronics are sensitive to discharges of
static electricity (ESD – ElectroStatic Discharge) when handled. To
prevent damaging the components, special care is therefore required
when handled.
Fig. 4 Earthed wristband
Damage is usually undetected, and a circuit board can operate normally
during commissioning but may show signs of problems later.
A wristband connected to earth offers good ESD protection when
working with electronics. Wear this wristband before opening any
screened metallic packaging or exposing any fitted PCB's. Wear the
wristband until the PCB has been placed inside its screened packaging
or has been connected inside the closed external unit. Replaced PCBs
that must be returned must also be treated this way.
Fig. 5 Handling electronic components
CAUTION: Equipment damage through electrostatic
discharge!
▶ Never touch a PCB without an earthed wristband.
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