Temperature and pressure relief valve
Outdoor unit
Water heater
Electrical components
Component, normal
Component, accessory
3
Outdoor unit
353
Drip tray
50
Outdoor sensor
362
Shunt valve
54
Hot water sensor
406
Room sensor
55
Sensor hot-water top
408
EVU
71
Flow guard
417
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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