Considerations For Assembling The Indoor Unit; Heating System Minimum Volume And Flow; Installation - Bosch Compress 3400i AWS Installation Manual
Indoor unit for air to water heat pump
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- Installation manual (24 pages) ,
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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.
Outdoor Unit
Minimum
Underfloor/fan coils
Radiators
Minimum flow
Table 7 Minimum volume and flow for outdoor unit CS3400iAWS 4 OR-
S
Outdoor Unit
Minimum
Underfloor/fan coils
Radiators
Minimum flow
Table 8 Minimum volume and flow for outdoor unit CS3400iAWS 6-10
OR-S
Compress 3400i AWS – 6721852066 (2023/01)
CS3400iAWS 4 OR-S
Recommended
13l
35l
4l
13l
15l/min
CS3400iAWS 6-10 OR-S
Recommended
27l
40l
10l
15l
15l/min
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
Installation
9
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