Water Connections (Fig. 14/15); Anti-Freeze Protection - Galletti Inverter technology MCI Manual De Instalación

NOTE: The discharge of the safety valve can be channelled
to the outside of the machine using the pre-cut holes (see
Fig. 4). In this case, it is necessary to provide an open drain
funnel.

6 - WATER CONNECTIONS (FIG. 14/15)

Make the plate heat exchanger hydraulic connections
with the necessary components, using material which will
guarantee that the screwed joints are leak-proof.
The figures 12 and 13 show a typical water circuit installation.
For an application with a water circuit, the following
recommendations must be taken into account:
1. The external circulation pump must be installed in the
return water pipe work immediately before the heat
pump (unit without hydraulic module).
2. It is advisable to install shut-off valves to allow isolation
of the most important circuit components, as well as the
heat exchanger itself.
These valves (ball, globe or butterfly valves) should
produce a minimum pressure drop when they are open.
3. Provide unit and system drains at the lowest system
point.
4. Install purges in the higher sections of the installation.
5. Pressure ports and pressure gauges should be installed
upstream and downstream of the external water pump.
6. All piping must be adequately insulated and supported.
Installation of the following components is obligatory:
1. The presence of particles in the water can lead to
obstructions in the heat exchanger.
It is therefore necessary to protect the heat exchanger
inlet with an extractable mesh filter. The filter mesh
gauge must be at least 10 mesh/cm
2. After assembling the system, or repairing the circuit, the
whole system must be thoroughly cleaned with special
attention paid to the state of the filters.
3. Pump flow rate control is made through a flow control
valve, which must be installed on the delivery pipe
during installation.
4. When water has to reach temperatures below 5°C, or the
equipment is installed in areas subject to temperatures
below 0°C, it is necessary to mix water with inhibited
ethylene glycol in suitable quantity.
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Anti-seizing pump
The MCI__H units are equipped with protection against the
seizing of the pump motor shaft. To allow this function, do
not empty the system or disconnect the power during long
periods of inactivity.
In any case, if the pump rotor shaft seizes after a long period
of inactivity, the user must do the following to unblock it:
- Disconnect the power.
- Remove the front panel.
- Unscrew the shaft-protection plug on the back of the
pump.
- Insert a screwdriver in the slot and turn the rotor shaft.
- Remount the protection plug.
- Reconnect the power.
System cleaning and water characteristics
In the case of a new installation, or cleaning the circuit, it
is necessary to perform a preventive cleaning of the system.
In order to guarantee the good operation of the product,
each time you clean the system, replace the water or add
glycol, check that the liquid appears clear, without visible
impurities and that the hardness is less than 20 °f.

Anti-freeze protection

If unit is switched off during the winter period when outdoor
air temperatures below 0°C can occur and ethylene glycol is
not used, it is recommended that the entire system is drained
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RG66012647