Domestic Hot Water Heat Pump Service Manual
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11.0 Periodic inspection items
Please observe local rules and regulations regarding potential periodical inspections of the
domestic hot water heat pump by skilled personnel.
11.1 Environmental requirements
When repairing or dismantling the domestic hot water heat pump please follow the environmental
regulations and legal requirements in relation to the recycling and disposal of materials.
11.2 Heating system and fan
Servicing primarily consists of cleaning the evaporator if no air inlet filter is installed.
Remove the top plate of the unit.
Relocate cables from the top part of the EPS housing.
Remove the top part of the EPS housing off the unit.
Clean the evaporator and fan with a bottle and brush.
NOTE: Do not use air conditioner cleaning fluids and aerosols, the chemicals contained in
these products can damage the EPS parts.
Be careful not to remove balancing weights on the fan wheel during this process, as this will cause
an imbalance and lead to a higher noise level as well as wear and tear on the fan.
11.3 Condensation and condensate drain
Together with inspecting and cleaning of the fan, the condensate drain shall be cleaned of dirt.
Pour some water in the lower half of the EPS part and check if the water flows freely. If not, then
the drain must be cleaned.
11.4 Water circulation and water tank
11.4.1 Pressure relief valve
Your installer has installed a pressure relief valve near the cold water connection on the domestic
hot water tank to protect the water tank against excessive pressures when the domestic water
expands during the heating process.
The back pressure valve (check valve), which is installed in front of the pressure relief valve on the
cold water pipe, prevents water from the tank flowing back into the cold water pipe. Therefore, the
pressure relief valve opens. The redundant water discharges. If the pressure relief valve did not
open, the water tank would burst.
The pressure relief valve must be operated regularly to remove lime deposits and to verify that it is
not blocked. It is tested by pressing the lever/turning the handle on the pressure relief valve while
checking that water discharges. Damage due to a faulty pressure relief valve are not covered by
the warranty
Please note that the water may drip from the discharge pipe of the pressure relief valve due to
heating of the water.
