Refrigerant; Regulations; Water Quality - Bosch Compress 3400i AWS Installation Manual

Regulations

HHandover to the user
When handing over, instruct the user how to operate the heating system
and inform the user about its operating conditions.
▶ Explain how to operate the heating system and draw the user's
attention to any safety relevant action.
▶ In particular, point out the following:
– Modifications and repairs must only be carried out by an approved
contractor.
– Safe and environmentally compatible operation requires
inspection at least once a year and proper cleaning and
maintenance.
▶ Point out the possible consequences (personal injury, including
danger to life or material damage) of non-existent or improper
inspection, cleaning and maintenance.
▶ Leave the installation instructions and the operating instructions with
the user for safekeeping.
1.2.1

Refrigerant

HRefrigerant R32
▶ This appliance is filled with refrigerant R32. If refrigerant gas gets
into contact with fire, it may generate a toxic gas or fire.
▶ Do not let any other substance than the specified refrigerant enter
the refrigerant circuit.
▶ Ensure that the refrigerant pipe is connected before running the
compressor.
▶ Be aware that refrigerant may not contain any odour.
▶ Read all safety instructions for handling flammable refrigerants
provided with this appliance in a separate document.
HInstallation, commissioning and service
▶ Do not smoke and make sure that any other possible ignition sources
are kept way from the working area. Ensure that the installation area
is adequately ventilated.
▶ Do not pierce or burn.
▶ This appliance must be stored in a room without continuously
operating ignition sources (e.g. open flames, operating gas or
operating electric heater).
▶ Prior and during installation, make sure that there are no refrigerant
leaks using an appropriate refrigerant detector that is adequately
sealed and intrinsically safe (i.e. no sparking). Never use potential
sources of ignition to search for refrigerant leaks. A halide torch (or
any other detector using a naked flame) may not be used. If a
refrigerant leak is detected, ventilate the room immediately.
▶ When performing any hot work, a dry powder or CO
should be kept ready.
▶ Wear protective gloves during installation.
▶ Do not use means to accelerate the defrosting process or to clean the
appliance, other than those recommended by the manufacturer.
HMaintenance
▶ When changing electrical components assure that these correspond
with the correct specification. Maintenance and service guidelines
must always be followed.
▶ Before any repair and maintenance procedure, an initial safety check
and component inspection procedures should be performed to
check that:
– Capacitors are discharged.
– All electrical components are switched off and wiring is not
exposed.
– Earth bonding continuity is ensured.
▶ Do not connect any electrical supply to the circuit if a fault that can
compromise safety is detected.
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2
This is an original manual. This manual may not be translated without the
approval of the manufacturer.
Follow the directives and regulations given below:
• Local provisions and regulations of the electricity supplier and
corresponding special rules
• National building regulations
• F-Gas regulation
• EN 50160 (Voltage characteristics of electricity supplied by public
electricity networks)
• EN 12828 (Heating systems in buildings - Design for water-based
heating systems)
• EN 1717 (Protection against pollution of potable water installations
and general requirements of devices to prevent pollution by
backflow)
• EN 378 (Refrigerating systems and heat pumps - Safety and
environmental requirements)
2.1
Water quality in the heating system
Heat pumps operate at lower temperatures than other heating systems
which means that the thermal de-airing is not as effective and oxygen
levels are never as low as with a system incorporating an electric/oil/ gas
boiler. This means that the heating system will be more susceptible to
corrosion when exposed to aggressive water.
Preventive actions are required if the heating system require recurrent
filling or where a heating water sample don't show clear water.
Preventive actions can be to supplement the heating system with a
magnetite filter and a de-airing valve.
Actions when the heating system requires recurrent filling:
▶ Check that the volume of the expansion vessel is sufficient to the
heating system volume.
▶ Replace the expansion vessel.
▶ Check the heating system for leaks.
A system separation with the help of a heat exchanger may be required if
the limits in table 3 can not be achieved.
Do not use any water additives except for a non-toxic pH-enhancer
and keep the water clean.
The limits stated in table 3 are required to ensure the output data and
operation of the heat pump throughout its entire service life.
fire extinguisher
2

Water quality

Hardness
Oxygen content
Carbon dioxide, CO
Chloride ions, CL
Sulphate, SO
Conductivity
pH
Table 3 Water quality
Additional water treatment to prevent lime-scale deposits
A poor quality of the heating water promotes the formation of sludge and
lime-scale. This can lead to malfunctions and damage of the heat
exchanger in the heat pump. According to the current guideline VDI
2035 "Prevention of damage in water heating installations" and
depending on the degree of hardness of the filling water, the system
volume and the total output of the system, water treatment may be
required to avoid damage due to the formation of lime-scale.
Regulations
Water quality
2
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4
Compress 3400i AWS – 6721852066 (2023/01)
<3 °dH
<1 mg/l
<1 mg/l
<250 mg/l
<100 mg/l
<350 μS/cm
7,5 – 9