Temperature and pressure relief valve
Outdoor unit
Water heater
Electrical components
Component, normal Component, accessory
Defrost sensor
1.4 Terminology
Table 1. Terminology
Term Meaning
Heating system/Heat transfer fluid
circuit
The circuit that generates heat to the property or to the water heater.
Supply line The heating system’s supply line with flow direction from the heat pump to radiators/
under floor heating or water heater.
Return line The heating system’s return line with flow direction from radiators/under floor heating
or water heater to the heat pump.
Circulation pump Circulation pump for heating system or brine circuit.
Refrigerant circuit The energy carrying circuit between the outdoor air and heating system.
Refrigerant The gas/liquid that circulates in the refrigerant circuit.
Brine circuit The circuit that transports energy to or from the heat source.
Brine The fluid that circulates in the brine system.
Service instructions VMGFC302 – 5
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