Piping Installation; Safety Valves - Danfoss DHP-A Installation Instructions Manual

5

Piping installation

Warning! As the water temperature in DHP-H Opti Pro and DHP-L Opti Pro becomes extremely hot, a
mixer valve must be installed between the cold water and hot water pipes to ensure a lower domestic hot
water temperature.Alternatively the maximum hot water temperature must be reduced in the Service
menu.
Warning! Danfoss SP (1-phase) heat pumps have a factory installed safety valve for temperature and
pressure, (10 bar 90-95°C), in accordance with the requirements in Great Britain. This valve is located in the
water tank and may not be used for any purpose other than connecting the outlet pipe.
Also note that for heat pump DHP-H Opti Pro SP and DHP-L Opti Pro SP it is imperative that the hot water
temperature is changed from default setting 95°C to 85°C.
Caution! Piping installation must be carried out in accordance with applicable local rules and regulations.
The hot water tank must be equipped with an approved safety valve.
Caution! To prevent leaks, ensure that there are no stresses in the connecting pipes!
Caution! It is important that the heating system is bled after installation. Bleed valves must be installed
where necessary.
Note! Ensure that the pipe installation is carried out in accordance with the dimensions and connection
diagrams.
Note! Configure the heat pump for the desired system solution in the SERVICE\ADD. HEATER\EXTERNAL
ADDITION menu.
5.1

Safety valves

Caution! Radiator systems with a closed expansion tank must also be equipped with an approved
pressure gauge and safety valve, minimum DN 20, 1.5 bar opening pressure, or according to country
specific requirements.
Caution! Cold and hot water pipes and overflow pipes from safety valves must be made of heat resistant
and corrosion-resistant material, e.g. copper. The safety valve overflow pipes must have an open
connection to the drain and visibly flow into this in a frost-free environment.
Caution! The connecting pipe between the expansion tank and the safety valve must slope continuously
upwards. A continuous upwards slope means that the pipe must not slope downwards from the
horizontal at any point.
22 – Installation instructions VMBMA1002