Bedienungsanleitung Bosch Compress 3400i AWS (Seite 9 von 44) (Englisch)

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Installation

Compress 3400i AWS – 6721852066 (2023/01)

4.1 Considerations for assembling the indoor unit

• Mount the indoor unit at a suitable location within the house. Use a

spirit level to ensure that the appliance is in the correct position.

• Make sure that there are no operating ignition sources in the room

where the indoor unit is installed.

• Pipe work between the outdoor and indoor units must be as short as

possible. Use insulated pipes.

• Check that all pipe connections are intact and have not come loose

during transportation.

• Ensure all pipes and connections are protected against physical

damage. Mechanical connections to the indoor unit must be

accessible for maintenance purposes.

• Follow the instructions of the outdoor unit installation manual.

• Water discharged from the pressure relief valve should be routed

away from the indoor unit to visibly terminate in a frost-free outlet.

• The installation location of the indoor unit must have a drain.

• The low voltage cables must be routed with a minimum clearance of

100 mm from live 230V cables.

4.2 Heating system minimum volume and flow

A sufficient amount of energy stored in the system is required to avoid

multiple start/stop cycles, incomplete defrosting or unnecessary

alarms. Energy is stored in the heating system water volume, as well as in

the system components (radiators and underfloor heating).

For the defrost operation of the outdoor unit, a minimum volume and

flow must be ensured and permanently available.

The minimum volume can be provided by the open circuits (the

necessary zone valves/thermostats must be always fully open) and/or by

a buffer tank. For an optimal and most efficient defrost operation a

recommended volume is stated.

The minimum flow must be ensured within the minimum volume

available. If the minimum flow is not met, additional measures are

needed, e.g. differential bypass valve or parallel buffer. Note that if an

hydraulic separator is present it requires an additional heating circuit

pump.

In certain circumstances depending on the available energy stored in the

system, the auxiliary heater may be used to ensure the complete defrost.

Table 7 Minimum volume and flow for outdoor unit CS3400iAWS 4 OR-

Table 8 Minimum volume and flow for outdoor unit CS3400iAWS 6-10

OR-S

5 Installation

NOTICE

Residue in the pipework can damage the system.

Residue and particles in the heating system impair the flow rate and lead

to faults.

▶ Before connecting the indoor unit, flush the pipe system to remove

any foreign bodies.

CAUTION

Risk of injury!

During transport and installation there is a risk of crushing injury. During

maintenance, internal parts of the appliance may become hot.

▶ The installer is obliged to wear gloves during transport, installation

and maintenance.

The indoor unit is part of a heating system. Faults in the indoor unit can

occur from poor water quality in the radiators or pipework of the

underfloor heating system, or when the oxygen content in the system is

persistently high.

Oxygen causes corrosion products in the form of magnetite and

sediment.

Magnetite is an abrasive material which affects pumps, valves and

components with turbulent flow characteristics, e.g. in the condenser.

If heating systems have to be regularly refilled or if hot water samples

from these systems are cloudy, corresponding measures such as

retrofitting magnetite separators and air vents are required.

▶ Ensure the insides of the pipes are clean and do not contain any

harmful contaminants such as sulphuric compounds, oxidants,

debris and dust.

– Never store refrigerant pipes outdoors.

– Only remove seals from the pipe ends when you are ready to

connect them.

– Utmost care must be taken when routing refrigerant lines.

– Only shorten refrigerant lines using pipe cutters and seal the ends

afterwards to prevent the ingress of dirt and moisture.

Dust, foreign bodies and moisture inside the refrigerant lines can be

detrimental to oil quality or can result in compressor failure.

▶ After cutting, immediately reseal reusable lengths of refrigerant

pipes.

▶ Purge the refrigerant pipes with nitrogen.

NOTICE

Danger of malfunction due to contaminants in pipework!

Solids, metal/plastic filings, flux and thread tape residue and similar

material can get stuck in pumps, valves and heat exchangers.

▶ Keep foreign bodies from entering the pipework.

▶ Do not leave pipe parts and connections directly on the ground.

▶ When deburring, make sure that no residue remains in the pipe.

WARNING

Risk of personal injury and damage to property

Using the incorrect sensors may lead to personal injury such as scalding

as well as damage to property due to an excessively high or low

Outdoor Unit CS3400iAWS 4 OR-S

Minimum Recommended

Underfloor/fan coils 13l 35l

Radiators 4l 13l

Minimum flow 15l/min

Outdoor Unit CS3400iAWS 6-10 OR-S

Minimum Recommended

Underfloor/fan coils 27l 40l

Radiators 10l 15l

Minimum flow 15l/min

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