Regulations; Preparing For Installation; Water Quality; Installing The Particulate Filter - Bosch Compress Hybrid 7000i AW Installer's Manual

Regulations

3 Regulations
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 properties in power grids for public distribution)
• EN 12828 (heating systems in buildings - Design and installation of
water-based heating systems)
• EN 1717 (Protection of potable water against pollution in potable
water installations)
The document 6720807972 contains further information about the
applicable regulations. You can use the document search on our website
to display this. You will find the address of the website on the back of
these instructions.
4

Preparing for 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.
4.1

Water quality

Water quality in the heating system
Heat pumps work at lower temperatures than other heating systems,
which is why thermal degassing is less effective and the remaining
oxygen content is always higher than with electric, oil and gas heaters.
This means that the heating system will be more sensitive to rust with
aggressive water.
If heating systems have to be regularly refilled or if hot water samples
from these systems are inconclusive, corresponding measures such as
retrofitting magnetite separators and air vents are needed before
installing the heat pump.
Measures during frequent refilling: replacing the expansion vessel,
leak test and verifying whether the size of the expansion vessel
corresponds to the system volume.
If the limits specified below are not reached, an intermediate heat
exchanger may be required to protect the heat pump.
Only use non-poisonous additives to increase the pH value and keep
the water clean.
Water quality Limit values for the heating system
Hardness
Oxygen content
Carbon dioxide, CO
2
-
Chloride ions, Cl
Sulphate, SO
4
Conductivity
pH
Table 2 Water quality in the heating system
6
<3 °dH
<1 mg/l
<1 mg/l
<250 mg/l
<100 mg/l
<350 μS/cm
7.5 – 9
4.2

Installing the particulate filter

NOTICE
Pollution in the heating system may damage the indoor unit!
Dirt and pollution in the heating system may damage the indoor unit.
▶ Install a particulate filter in the heating return of the indoor unit.
The particulate filter must have the following characteristics:
• Mesh size: max. 0.6 mm
• Flow factor: min. 7 m³/h
• Magnetite separator
4.3 Minimum volume and installation of the
heating system
NOTICE
Malfunction due to closed shut-off valves!
Under no circumstances whatsoever should the mass flow rate through
the indoor unit of the heat pump and the outdoor unit be blocked or shut
off when in operation.
▶ Always open all shut-off valves during operation.
▶ Never close all thermostatic valves (e.g. of the radiator).
As heating systems are configured in different ways, a minimum water
volume is generally not specified. Instead, the system volume is
considered to be sufficient if certain conditions are met.
A sufficient amount of energy must be stored in the system to
• ensure the heat pump function.
• prevent an excessive number of start-stop cycles.
• prevent incomplete defrosting of the outdoor unit.
• prevent unnecessary alarms.
Energy is stored in the water volume of the heating system,
the components of the system (e.g. radiators) and in the concrete floor
(e.g. with underfloor heating system).
Underfloor heating system without buffer cylinder
If the water volume in the heating system is insufficient,
this can lead to an excessive number of start-stop cycles.
▶ Install a room temperature-dependent control instead of a
weather-compensated control.
Small floor areas can lead to the auxiliary heater being activated in the
final phase of the defrosting process.
▶ The floor area must be at least 6 m
A larger floor area enables maximum energy savings and avoids booster
heater operation.
▶ The floor area must be at least 30 m
System with radiators without mixer and buffer cylinder
If the system only contains a few radiators, the auxiliary heater may be
activated in the final phase of the defrosting process.
▶ Install at least one open radiator with minimum output of 500W.
▶ Open radiator valves completely.
A larger system fill volume maximises energy savings and avoids booster
heater operation.
▶ Install at least four radiators with outputs of 500W each.
Compress Hybrid 7000i AW – 6721833053 (2020/09)
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