TF7039GB_A_NOT
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4.5.3.
HEATING WATER CIRCUIT COMPONENTS
SAFETY VALVE (3 BAR)
In the event of pressure faults in the heating water pipes, a safety valve is triggered and excess pressure is
released. This can be connected to a drain on site.
VENTILATION VALVE
Used to manually vent the system.
DRAIN COCK
To drain the system, a drain line is provided at the lowest point of the heating water pipe in the unit for service
and decommissioning purposes.
BUFFER
CHARGE PUMP
A hot water feed pump provides an available external feed pressure to overcome pressure losses outside
the heat pump in the heating circuit between the heat pump and the hot water buffer. The feed volume of this
high-efficiency energy-efficiency pump is adjusted by the electronic system control by means of a PWM sig-
nal.
VOLUME FLOW SENSOR AND HEAT METER
A heat meter determines the volume flow of the heating water in the heat pump and its temperature at the
heat pump heating water outlet. An additional temperature sensor is fitted at the heating water inlet. The
respective measurement data is transferred to the unit control system. The quantity of heat discharged is
calculated from the volume flow and the temperature difference.
4.5.4.
HEAT PUMP CONTROL AND SAFETY COMPONENTS
LOW-PRESSURE PRESSURE SWITCH
This device fixed on the low-pressure side of the cooling circuit stops the compressor from running if the
normal operating pressure range is undershot.
HIGH-PRESSURE PRESSURE SWITCH
This device fixed on the high-pressure side of the cooling circuit stops the compressor from running if the
normal operating pressure range is overshot.
ELECTRONIC CONTROL AND SWITCH PANEL
The unit is equipped with a switch and control cabinet (IP65), including:
•
Terminals for connecting the external temperature sensors
•
Terminals for connecting external components such as heating circuit pump or heating circuit mixer
•
Terminals for boiler/heating resistor alarm signal input
•
Terminals for public authority approval and Smart Grid approval
The heat pump can be switched on and off via the public authority approval. The exhaust fan is in-
tended for continuous operation. A corresponding release line is therefore not provided for the venti-
lation components.
