Introduction; General Description - Bosch AD HP270-1 Manual For After Sales Technicians

1.

Introduction

Domestic Hot Water Heat Pumps (DHW-HP), with or without air connections ducts, use the heat existing in the
surrounding air, or the waste heat from the indoor air, as an energy source for DHW preparation.
These machines are commonly known as air-source hot water heat pump and they are energy-saving and
environmentally friendly equipments. They have an efficiency which is usually 3 times higher than the traditional
gas water heaters, oil-fired and gas boilers, electric water heaters, with a plug-and-play system structure and easy
maintenance.
The heat pump has generally three operation modes:
- normal mode – only heat pump operation
- combi mode– heat pump and electric resistance operation
- electric heater mode– only electric resistance operation
The heat source can be the waste heat as referred, but also the potential energy of unheated rooms, or the air
discharged from rooms with high humidity such as bathrooms, toilets and laundry rooms.

1.1 General description

This model of domestic hot water heat pump provides hot water for residential purposes using a closed refrigerant
unit filled with a refrigerant gas (R134a). This ensures the energy production, by taking out the energy from a cold
source - air, and delivering this energy to a secondary circuit – water - where a simple circulation pump, ensures
the water flow through a heat exchanger, heating the water stored in a tank.
Page 3 from 40
(a)
Pict.1 Refrigeration Unit (a) and Storage Tank (b)
6720803522 AD HP270-1 2012/03 en
(b)