LG THERMA V AHNW16606B0, Installation Manual, Page: 32 / 65

32 Air-to-Water Heat Pump
Installation of Indoor Unit
Preparing the heating system
Prepare the system according to one of the recommended hydraulic piping diagrams which is
specified by the manufacturer of the device. This is the only way to ensure reliable and effective
operation of the device. After connecting the device to the heating system, it is necessary to examine
all circulating pumps and electric motor valves for correct functioning.
The device must be connected to the heating system via rubber compensator or flexible pipes. The
latter must not be under tension in final position, this would worsen the devices noise and vibration
protection. In extreme cases this can also lead of damage of the device.
Quality of heating water
The quality of the water used in the heating system is very important. The water from the water
supply is mostly suitable for use in the heating system. In new systems, the impurities are a
consequence of welding, soldering, dirty pipes (oil, grease), etc. In case the impurities start
accumulating in the device this can worsen the flow and heat transfer, In extreme cases, the water
freezes inside the pipes consequently destroying the system.
• To protect the device from intake and accumulation of dirt in the heat exchanger, you must install
the strainer on the return line, inlet into the device.
• A galvanic disconnection between individual elements of the heating system (i.e. boiler,
container ...) is obligatory.
In the case of using grey steel pipes in the heating system, it is necessary to degrease them (the
interior of the pipe) before connecting them to the heat pump.
The water in the heating system has to be in accordance with the requirements of standard VDI
2035 and must not contain microorganisms. The heating system has to be filled with soft water,
which has been treated with anti-corrosion and antibacterial agents for preventing corrosion.
Before filling, the heating system has to be cleaned of all impurities.
The heating system has to be thoroughly vented. You must prevent air, including diffusion air
entering the device.
• If the product is installed at existing hydraulic water loop, it is important to clean hydraulic pipes to
remove sludge and scale.
• Installing sludge strainer in the water loop is very important to prevent performance degrade.
• Chemical treatment to prevent rust should be performed by the installer.
• It is strongly recommended to install an additional filter on the heating water circuit. Especially to
remove metallic particles from the heating piping, it is advisable to use a magnetic or cyclone filter,
which can remove small particles. Small particles may damage the unit and CANNOT be removed by
the standard filter of the heat pump system.