Bedienungsanleitung Viessmann Vitocal 151-A (Seite 13 von 76) (Englisch)

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The appliance is only intended to be installed and

operated in sealed unvented heating systems that

comply with EN 12828, with due attention paid to the

associated installation, service and operating instruc-

tions.

Depending on the version, the appliance can only be

used for the following purposes:

■Central heating

■Central cooling

■DHW heating

The range of functions can be extended with additional

components and accessories.

Intended use presupposes that a fixed installation in

conjunction with permissible, system-specific compo-

nents has been carried out.

Commercial or industrial usage for a purpose other

than central heating/cooling or DHW heating shall be

deemed inappropriate.

Incorrect usage or operation of the appliance (e.g. the

appliance being opened by the system user) is prohibi-

ted and will result in an exclusion of liability. Incorrect

usage also occurs if the components in the heating

system are modified from their intended function.

Note

The appliance is intended exclusively for domestic or

semi-domestic use, i.e. even users who have not had

any instruction are able to operate the appliance

safely.

Product information

Design and function

Design

Your air source heat pump consists of an indoor unit,

plus an outdoor unit that is installed outside the build-

ing.

Heat generation

The fan in the outdoor unit draws ambient air in

through a heat exchanger (evaporator). In the evapo-

rator, the thermal energy from this ambient air is trans-

ferred to the refrigerant circuit. Here, the temperatures

required for room heating and DHW heating are gener-

ated.

The heat passes to the indoor unit via the hydraulic

connection lines and from there into your heating sys-

tem.

Room cooling

To provide room cooling, the heat pump's refrigerant

circuit operates in reverse mode. Heat is extracted

from your rooms and transferred to the ambient air out-

side by the evaporator.

Energy supply

The refrigerant circuit is driven electrically via a com-

pressor. Compared with the thermal energy extracted

from the air, this compressor requires only a small

amount of electrical power. This power is often provi-

ded at a favourable tariff by your power supply utility.

Depending on the tariff conditions and the power sup-

ply, your power supply utility may make short-term

interruptions to the heat pump power supply (power-

OFF), e.g. if there is high network load. During a

power-OFF period, another heat source takes respon-

sibility for supplying heat to the building.

Additional heat sources

Your heat pump can control the following additional

heat sources and switch them on if necessary:

■Instantaneous heating water heater in the indoor unit

(factory-fitted)

■External heat generator, e.g. an existing gas boiler

■Another heat pump in a heat pump cascade, if avail-

able

The conditions under which the individual heat sources

are switched on will depend on the operating condi-

tions of your heating system. Efficient operation of the

heat pump always takes priority here. If the heat pump

is not ready for operation, the heat source that is cur-

rently the most energy efficient will always be switched

on.

Heat pump cascade

A heat pump cascade consists of two linked heat

pumps that are switched on individually or together,

depending on the demand for heat or cooling. One of

the heat pumps takes the role of lead heat pump and

controls the entire heat pump cascade.

Introductory information

Intended use

6199692

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Viessmann Vitocal 151-A Seite 13

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