Hitecsa EWMIM Serie Manual De Instalación, Uso Y Mantenimiento página 59

System configuration for ASP0lASPI0lASP1 set up
Pump P0lASP0 installation
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The units are equipped with a 3-speed electronic circulator, which can be selected from the selectors on board. The maximum speed it set by
default. The unit's hydraulic circuit is complete with an expansion tank and safety valve, air bleed and drain valves.
Pump PI0lASPI0 installation
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The units are equipped with an electronic circulator with continuous speed regulation 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 (guarantee the minimum water flow rate AT=8). 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.
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With the circulator operating with continuous 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.
Pump P1lASP1 installation
o The units are equipped with a hydraulic pump at a fixed speed for systems where higher head than the nominal flow rates is required. The unit's
hydraulic circuit is complete with an expansion tank and safety valve, air bleed and drain valves.
IOM_EWMIM-EWMIMH_120a262_207984_200601_ES-EN-FR-DE-IT
1 Unit
2 Inertial storage tank (if necessary)
3 Hydraulic connection pipes
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