Energy Saving System Pump Control; Hydraulic Circuit Content - Hitecsa 117 Manual De Instalación, Uso Y Mantenimiento

The process is fully automatic and you must only follow the instructions
that appear on the control panel. 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.
○ 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 (guaranteeing the minimum
flow rate) 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
Example with a 3-way valve
Pump P1lASP1 installation
o The units are fitted with a single speed circulation pump.
Once the connections to the unit are made, check that none of the
pipes leak, and bleed the air from the system. The rate of the water that
flows through the heat exchanger must not drop below the value
corresponding to a temperature differential of 8°C. The minimum flow
rate to be guaranteed to the machine is 1450 l/h. If the flow rate drops
below this value, the flow alarm may be triggered.
II.6.2

ENERGY SAVING SYSTEM PUMP CONTROL

The unit manages the pump unit, striving for the highest energy
savings. When the machine reaches the set point and the regulator
detects that the thermal/cooling load is null, the pump is turned off for a
set time (10'). Following regular intervals of time (10'), the pump is
turned back on for some seconds (60"). If, in these situations, it is
necessary to activate the compressor, the unit starts generating
heating/cooling capacity again. Otherwise, the pump is turned off to wait
for the following cycle. The times can be changed from a parameter
under the maintenance menu (see the manual of the electronic control).
IOM_EQUI PF-EQUHI PF_117a128_207983_200101_ES-EN-FR-DE-IT
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 enables
circulation with the minimum flow rate, especially during the transitory
unit start-up and switch-off without interrupting the flow to the
evaporator.
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.
Example with Bypass
P0/PI0/P1
II.6.3
To ensure the unit works correctly, the system needs a minimum
volume of water. The minimum water content is determined on the
basis of the unit's cooling or heating capacity (for heat pumps/EXP) in
the design of the unit, multiplied by the coefficient expressed in 3 l/kW.
31

HYDRAULIC CIRCUIT CONTENT

P0/PI0/P1