9
WARNING: Make sure that, when designing the pipe length and diameter do not exceed the maximum head loss on
the plant side, please see the technical data given in the table of Paragraph 0 (available head pressure).
WARNING: In the models of HP_OWER series, the expansion vessel is not integrated on the plant side. The actual
capacity of plant circuit should be checked by the installer in order to provide an expansion tank with adequate
l
WARNING: Connect the pipes to the attacks by using always key against key system.
WARNING: Unit water inlet pipe have to be in correspondence with the connection labelled: ”WATER INLET”,
otherwise the evaporator may freeze.
WARNING: It is compulsory to install on the WATER INLET connection a metallic filter with a mesh not larger than
1mm. Should the water flow switch be altered or should the filter not be installed, the warranty will no longer be
valid. The filter have to be kept clean, so make sure it is clean after the unit has been installed, and then check it
periodically.
All units are standard supplied with the water flow switch (factory installed). Should the water flow switch be
altered, removed, or should the water filter not be installed on the unit, the warranty will be invalidated. Please
refer to the wiring diagram for the water flow switch electric connections.
The water on the filling/replenishment pipe must be opportunely pre-filtered from any suspended particles and
impurities through the use cartridge filter (washable, wrapped wire, etc.) of at least 100 microns.
Check the water hardness with which you load and top up the plant circuit. With particularly hard water, in this
case it is necessary to utilize a water softener. For treating water for the plant, please refer to UNI 8065.
CAUTION: The INVERTER control system is able to manage minimum water contents in the plant up to a value of
75 liters for the model HP_OWER 250, of 105 liters for the model HP_OWER 350, of 150 liters for the model
HP_OWER 500. This value makes reference to the liters absolute value and not to any kW of installed power.
6.4.1
Hydraulic circuit
HP_OWER 250-350N
HP_OWER 500N
A
Plate heat exchanger
B
Water flow switch
C
Service valve
D
Inlet pressure gauge
E
Outlet pressure gauge
F
Air vent valve
G
Safety valve
H
Circulating pump
At the highest point of the plant circuit it is necessary to install an automatic air vent valve.
Provide an auxiliary expansion tank (not supplied) in order to control the volume changes in the plant side.
6.4.2
Drainage connection
All HP_OWER units are adopt drain holes on the basement for the discharge of the condensate that may leach from the pipes of
the hydraulic and refrigerant circuits, and to discharge the water generated during defrosting cycles.
6.4.3
Plant circuit filling
WARNING: Verify all the filling/replenishment operations.
WARNING: Before beginning the filling/replenishment operation of the plant circuit, disconnect the unit from the
electric power supply.
WARNING: The filling/replenishment of the plant circuit must always be done under controlled conditions of
pressure (max 1 bar). Make sure that you have installed on the line of filling/replenishment a pressure reducer and a
relief valve.
WARNING: The water on the filling/replenishment pipe must be suitably pre-filtered from any impurities and
suspended particles. Make sure that you have installed a cartridge filter removable.
WARNING: Before beginning the filling /replenishment operation, unscrew the plugs of the air vent valve. Tighten
the plugs after finishing the operation of filling/replenishment of the plant circuit system.
