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Installation
Unsuitable antifreeze can damage the heat exchanger or cause a fault in
the heat source or DHW supply.
Unsuitable antifreeze can damage the heat source and heating system.
Only use antifreeze listed in the document 6720841872, which
contains antifreeze products approved by us.
▶ Only use antifreeze according to the specifications of the
manufacturer, e.g with regard to the minimum concentration.
▶ Follow the instructions of the manufacturer of the antifreeze about
regular checking of the concentration and corrective measures.
Heating water additives
Unsuitable heating water additives can cause damage the heat source
and heating system or cause a fault in the heat source or DHW supply.
The use of a heating water additive, e.g. corrosion inhibitor, is only
allowed, if the manufacturer of the heating water additive certifies its
suitability for all materials in the heating system.
▶ Only use heating water additives in accordance with the instructions
of its manufacturer about concentration, regular checking of the
concentration and corrective measures.
Heating water additives, e.g. corrosion inhibitors, are only required in
the case of constant oxygen permeation, which cannot be prevented
through other means.
Sealants in the heating water can cause deposits in the heat generator,
therefore it is not advisable to use it.
Water quality for potable water (DHW)
The integrated domestic hot water cylinder is constructed to heat and
store potable water. Follow country-specific regulations, directives and
standards for potable water. The water quality in the cylinder has to
comply with the framework of the EU directive 2020/2184.
To protect the DHW system against increased lime scale and resulting
service work on domestic hot water tanks:
Water hardness
≥ 15°dH/25°fH/2,5 mmol/l
≥ 21°dH/37°fH/3,7 mmol/l
Table 8 Recommendation for hard domestic water
3.3
Minimum volume and execution of the heating
system
Normally the energy for the defrost cycle is drawn form the buffer
cylinder and the heating system, but in small systems with low flow the
controller may switch to draw energy from the DHW cylinder instead.
Even the electrical heater may be activated to ensure a proper defrost.
3.4
Check size of expansion vessel
Characteristic diagram for expansion vessel (17 l)
The following graph can be used to estimate whether the installed
expansion vessel will be sufficient or whether an additional expansion
vessel will be required (not for underfloor heating).
For the curves shown, the following parameters were taken into account:
• 1 % water seal in the expansion vessel or 20 % of the rated volume in
the expansion vessel
• Working pressure differential of the pressure relief valve of 0.5 bar
12
Recommendation
Set DHW temperature < 55 °C
Install a water treatment system
• Pre-charge pressure of the expansion vessel corresponds to the
static system height above the appliance.
• Max. operating pressure: 3 bar
T [°C]
70
60
50
A
40
30
0
100
200
300
Fig. 9
Curves for the expansion vessel (17 l)
Legend to fig. 9:
I
Pre-charge pressure 0.5 bar
II
Pre-charge pressure 0.75 bar (default setting)
III
Pre-charge pressure 1.0 bar
IV
Pre-charge pressure 1.2 bar
V
Pre-charge pressure 1.3 bar
A
Operating capacity of the expansion vessel
B
Additional expansion vessel required
T
Flow temperature
V
System content in litres
▶ If results are borderline: determine precise vessel size in accordance
with country-specific regulations.
▶ If the intersection is on the right beside the curve: install an additional
expansion vessel.
4
Installation
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.
NOTICE
Risk of material damage!
Particles in the pipework of the heating system can damage the heat
pump system.
▶ Installation of a particle filter is mandatory for all systems.
4.1
Transport and storage
The indoor unit must always be transported and stored in an upright
position. If needed, it may be leaned temporarily.
The indoor unit may not be stored or transported at temperatures below
– 10 °C.
Compress 5800i AW – 6721858460 (2023/06)
V
IV
B
III
II
400
500
600
V
[l]
0010043330-001
A
I
700
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