Table of Contents
Advertisement
A non-return valve may be necessary to prevent self-circulation in the
heating system. This can mainly arise in the following situations:
▶ Heating system with radiators.
▶ The indoor unit is installed below the heating system (basement or
multi-story building).
▶ The outdoor unit is installed on the same height or below the indoor
unit.
Hot tap water:
• Non-return valve for incoming cold water
• Pressure relief valve cold water
Heat pump:
• Manual valve [VC4] between the indoor unit and the heat pump. The
valve is used when filling and venting the system. It is not allowed to
completely disconnect the heat pump from the indoor unit, therefore
only one valve is required.
2.8.2
Optional accessories
The following accessories can be added on and are not required for
operation of the system.
• Room controller
• Connect-Key K30RF wireless module
• Thermostatic valve hot water
• DHW circulation pump
• Safety thermostat for under floor heating
• Condensation sensor for non -condensing cooling mode
2.8.3
Room controller
For higher system efficiency, it is recommended to integrate room
controllers instead of thermostatic radiator valves in the heating system.
The room controller provides feedback that will automatically adjust the
heating curve to control the room temperature. This ensures that the
heat pump will only operate when there is heating or cooling demand.
3
Preparing for installation
▶ Run the connector pipes for the heating system and cold water/DHW
in the building up to the installation location of the indoor unit.
▶ Mount and align adjustable feet provided so that the indoor unit is
level.
3.1
Placement of the indoor unit
• The indoor unit is placed in the building. The pipework between the
heat pump and indoor unit must be as short as possible. Use
insulated pipes.
• The installation location for the indoor unit must have a drain.
• The ambient temperature around the indoor unit shall be between
+10 °C and +35 °C.
3.2
Water quality
3.2.1
Quality requirements for the heating water
The quality of the fill and top-up water is an essential factor for increased
efficiency, functional reliability, long service life and for maintaining the
operational readiness of a heating system.
Unsuitable water can damage the heat exchanger or cause a fault in the
heat generator or DHW supply!
Unsuitable or contaminated water can lead to sludge formation,
corrosion or scaling. Unsuitable antifreeze or hot water additives
Compress 5800i AW – 6721858460 (2023/06)
(inhibitors or anti-corrosion agents) can damage the heat generator and
heating system.
▶ Only fill the heating system with potable water. Do not use well or
groundwater.
▶ Determine the water hardness of the filling water, before filling the
system.
▶ Flush the heating system prior to filling.
▶ If magnetite (iron oxide) is present, anti-corrosion measures are
required and the installation of a magnetite separator and a de-airing
valve in the heating system is recommended.
▶ The limit values in table 2 must not be exceeded, even if national
directives contain higher limits.
Water quality
Unit
Conductivity
μS/cm
pH
Chloride
ppm
Sulphate
ppm
Sodium
ppm
Table 2 Boundary conditions for potable water (filling water)
▶ Check the pH value after > 3 months of operation. Ideally at the first
service.
Material of heat
Heating water
generator
Copper brazed
•Untreated potable water
heat exchangers
•Fully softened water
• Low-salt operation < 100 μS/
cm
1) If pH value is < 8.2 an on-site test for ferrous corrosion is necessary
Table 3 pH value ranges after > 3 months of operation
▶ Treat the fill and top up water according to the instructions in the
following section.
Depending on the hardness of the filling water, the system water volume
and the maximum heat output of the heat generator, water treatment
may be required to avoid a damage in water heating installations, due to
the formation of lime scale.
Preparing for installation
Value
≤ 2500
≥ 6,5... ≤ 9,5
≤ 250
≤ 250
≤ 200
pH value range
1)
7.5
– 10.0
1)
7.0
– 10.0
9
Advertisement
Table of Contents
