10 MDE-SL3
120.1-290.1
M04J40H14-00
4.3 Supply
line
In horizontal sections Inclination with the gas flow to aid the movement of the oil. (0.5% inclination).
WARNING the discharge temperature can reach values of 80/100°C. Appropriate insulation is required if there is contact with the exterior.This
is to avoid accidental contacts by unqualified personnel.
When the condenser is installed above the compressor the discharge line must have a trap at the compressor level which drops to the floor.
This will reduce the risk of condensed liquid refrigerant returning up the compressor line during shutdowns.
For vertical rises, as well as well the socket also fit an oil collection trap every 6 metres.
A.
check
valve
B.
antivibration
mount
C.
solenoid
valve
D.
liquid
receiver
E.
siphon
4.4 Liquid
receiver
The liquid receiver installation is always recommended, above all when:
•
the connecting pipes are longer than 10 metres
•
the installation operates in variable climatic conditions (for example fresh air temperature with ranges day/night, summer/winter).
The receiver must have a capacity adequate to the installation and it must be positioned near the evaporating unit.
If the distance is greater than 15 metres and the compressor is located in the lower part of the system, position the receiver near the unit with
the compressor.
The liquid receiver can absolve the above described functions:
•
it avoids the presence of gaseous freon in the expansion device
•
it compensates for the charge variations in the installation when changing the operating conditions
•
it avoids an excessive condenser flooding with consequent condensing temperature/pressure raising if the installation charge is
performed in anomalous climatic conditions.
Along with the previously mentioned aspects, the liquid recipient compensates for the various volumes of the exchangers as their function
changes (evaporator/condenser and vice versa).
Make very sure that the return and supply points are placed at the bottom.
4.5 Checking for leaks
1
Check carefully that the evaporator unit taps are closed.
2
Connect the pressure gauges with the service fittings (on the taps or on the connection pipes).
3
Pressurise the system with nitrogen:
mode 1: up to PS (see the label) and wait few hours
mode 2: up to PS x 1,43 law (as according to UNI-EN 378-2)
CAUTION: EXPLOSION DANGER
4
Spray using a leak detector spray cocks and pipes and check if bubbles are present (gas leaks).
5
Discharge the nitrogen from the unit.
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