-
INSTALLATION
DS170 PILOT
MANUAL
-
13
4.2.1.8.4 - Connecting the pressure relief valve
The Heat Pump and the
Pilot
are both equipped with pressure-relief valves. The
Pilot’s
pressure-relief valve is set at 3 bar.
The pressure-relief valve on the Heat Pump sets the maximum acceptable pressure in the installation (2.5 bar when hot). The maximum service
pressure in the Heat Pump must, consequently, be lower than 2.5 bar.
Example : If the Heat Pump is positioned 5m below the
Pilot
, the pressure reading on the
Pilot
would be 0.5 bar less than the real pressure of the water
in the Heat Pump. In this case, the maximum service pressure for the
Pilot
would be 2 bar.
Therefore it would be advisable to fi ll the heating circuit at an intermediary pressure (between 1 and 1.5 bar).
For safety reasons (potential presence of fl ammable R290 gas), drainage of the Pilot’s pressure-relief valve must
MANDATORILY
be done
outside the building
. The outlet of the drainage pipe (4m length provided with the pilot) must be placed downwards in order to avoid any
introduction of water inside, any risk of obstruction due to frozen water or any other pollution (see drawing).
If the provided drainage pipe is too short, it’s mandatory to use a well-adapted length (can by supplied on demand). It will have to be installed
as well as there will be no pinch on it, it will then ensure the drainage of the overpressure from the 3 bar safety valve outside the building.
The Pilot’s pressure-relief valve drainage pipe
must be properly secured until the outside of
the building without any pinching zone.
WARNING
Failure to comply with this requirement
concerning the evacuation of overpressure outside
the building releases the heat pump manufacturer
from any liability in case of incident.
The EPDM pipe must be pushed to the end of
the safety valve barb tip and held with a hose
clamp.
1
2
1.
EPDM
pipe
2.
Hose
clamp
