Water Pipework - Midea LRSJF-V120 Technical Manual

2.6 Water pipe insulation
The complete water circuit, inclusive all piping, must be insulated to prevent condensation during
cooling operation and reduction of the cooling and heating capacity.
If the temperature is higher than 30 and the humidity is higher than 80%RH, then the thickness of
the sealing materials should be at least 20 mm in order to avoid condensation on the surface of
the sealing.
Caution:
Failure to do good piping insulation, the cooling/heating capacity
of the unit will be reduced and condensate drop will destroy the furniture and other
devices.

2.7 Water pipework

Checking the water circuit
The units are equipped with a water inlet and water outlet for connection to a water circuit. This
circuit must be provided by a licensed technician and must comply with all relevant European and
national regulations
:
WARNING
 The unit is only to be used in a closed water system. Application in an open water circuit can
lead to excessive corrosion of the piping.
 Before continuing the installation of the unit, check the following points:
 The maximum water pressure is 3 bar, but the best pressure range is between 1 to 2 bar. It
will be perfect, if the water pressure is the same as pre-pressure of expansion vessel.
 To facilitate service and maintenance install one shut-off value at the water inlet and one
shut-off value at the water outlet of the indoor unit.
 Drain taps must be provided at all low points of the system to permit complete drainage of the
circuit during maintenance.
 Make sure to provide a proper drain for the pressure relief valve to avoid any water coming
into contact with electrical parts.
 Air vents must be provided at all high points of the system. The vents should be located at
points which are easily accessible for servicing. An automatic air purge is provided inside the
indoor unit. Check that this air purge is not tightened too much so that automatic release of air
in the water circuit remains possible.
There might be air in the electric heater water tank. The air will cause the damage of the
electric heater and cause the abnormal operation of the system. The air in the water tank can
be purged by the manual discharging valve in the top of the water tank. The power for the
electric heater cannot be supplied before discharging the air in the water tank. It will last 30
min until discharging the air completely.
 Take care that the components installed in the field piping can withstand the water pressure.
 The filter (accessory of indoor unit) must be connected into the water circuit.
CAUTION
When the unit running in the cooling mode, there will be condensate drop the water inlet and