Installer_manual_OEM_Vaillant_PROTO_3_GB - 06/11 - Vaillant
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2.4
Concept of operation
A heat pump (HP) is a thermodynamic machine which transfers
heat from one location to another. To do so, it employs the
characteristics of a refrigerant fluid.
The system is composed of the following circuits:
-
The refrigeration circuit which transfers heat to the water
circuit following the evaporation, compression, condensation
and expansion of the fluid.
-
The heating circuit.
2.4.1
In heating mode
2
1
3
4
5
6
Key
1 Tubular heat exchanger
2 Reverse cycle valve
3 Ventilating fan
4 Compressor
5 Pressure regulator
6 Exchanger with plates
2.4.2
Min. and Max. temperature settings in heating
60
50
70
40
45
30
20
10
0
-20
-10
0
10
20
30
A
B
Key
A Water temperature
b Air temperature
2.4.3
Principle for controlling the heat pump
The heat pump can be controlled in two different ways. The choice
of the type of control is set in the After-Sales Service menu.
-
Control through the command unit, used as an room
thermostat. This configuration is recommended in the case of
an installation with a single heating zone. Here, the command
unit has two functions: room thermostat and configuration
tool.
-
Control by a management system using contact inputs (not
delivered). This configuration is recommended in the case
of an installation with multiple heating zones. The system of
active management of the heat pump using dry 12 V contacts.
The command unit is used only as a configuration tool.
INTRODUCTION