Hydraulic Set-Ups 138÷262 - Hitecsa EWMIM Serie Manual De Instalación, Uso Y Mantenimiento

II.7.10 HYDRAULIC SET-UPS 138÷262
Standard set-up
The units are installed in systems where the pumping unit and the thermal inertia are provided by the user. The pump must be installed with the supply
pressing against the machine's water intake.
Pump and Tank & Pump set up
The units are equipped with a pump or with a pump and a buffer tank. The unit's hydraulic circuit is complete with an expansion tank and safety valve,
air bleed and drain valves.
Pump and Tank & Pump with INVERTER set up
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The units are equipped with an electric pump featuring constant speed control for variable flow rate systems. The units is complete with a sensor to
measure the pressure difference between the system's flow and return pressure. During the installation phase, the unit must be set by following the
simple procedure. With the system completely open so that the water flow rate reaches each area, read the differential pressure value on the
control panel. The value is the set-point that is to be assigned to the differential pressure to control. In the case of system partialisation with the
terminals or areas closed, the pressure differential value is kept constant by decreasing the flow rate. The unit's hydraulic circuit is complete with an
expansion tank and safety valve, air bleed and drain valves.
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For proper operation of the unit with this type of system set-up, you must comply with the basic rule, meaning that there must always be a circuit
branch that enables circulation of water. This can be achieved with a diagram like the one indicated in the figure, namely with one of the terminals
equipped with a 3-way valve whilst all the remaining ones can be equipped with a 2-way shut-off valve. Alternatively, there can be a bypass located
in a certain point of the hydraulic circuit. It is recommended to place the bypass or 3-way valve as far away as possible from the unit. The bypass
has the function to enable circulation of the minimum flow rate, especially during starting and switch-off transients of the unit without interrupting
flow to the evaporator. The minimum flow rate value is shown in the "Hydraulic data" section.
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With the electric pump operating with continuous speed regulation, it is also possible to start-up a cold system by modulating the speed and
enabling it to reach the operating temperature more rapidly.
IOM_EWMIM-EWMIMH_120a262_207984_200601_ES-EN-FR-DE-IT
1 Unit
2 Inertial storage tank (if necessary)
3 Hydraulic pump
1 Unit
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ADVANCE