USER and
MAINTENANCE
MANUAL
29
All lubricant replacement operations have to be executed when the
compressor is at standstill.
For lubricant replacement are required instruments that are part of
the normal equipment of each refrigerator technician; the necessary
instruments to execute the ordinary maintenance operations are:
- vacuum pump
- lubricant hand pump
- flexible hoses with swivel connections and valve opener
- ratchet wrench for square stems
- use nitrogen for blowing
1
With working compressor, close the suction valve; when the suction
pressure reduces at 0.1÷0.2 bar, switch off the compressor.
2) close the discharge valve
3) remove, slowly, discharge valve plug
4) remove the oil discharge plug and let flow all the lubricant in a
suitable package
5) screw and close well the oil discharge plug and discharge valve plug
6) remove the oil charge plug (ref.3, see drawings on catalogue),
applying at its place a Schrader service valve
7) remove the protection cap from the service valve and connect the
lubricant hand pump discharge
8) connect the hand pump suction to the lubricant package
9) by acting the hand pump, introduce the right oil quantity in the
compressor crankcase
10) remove the hand pump from the service valve
11) connect the vacuum pump suction line to the Schrader service valve
12) start the vacuum pump and evacuate the compressor for at least 15
minutes
13) disconnect the pump from the service valve and switch off
14) screw the protection cap to the service valve
15) open the compressor discharge and suction valves
16) start the compressor
17) after 15 ÷ 20 working minutes, check the lubricant level
The level at which the lubricant settles during compressor working is
highly influenced by the discharge ratio and therefore by the working
temperatures. Considering that the acceptable minimum level is 1/4 of
oil sight glass, the maximumlevel has not to be higher than 3/4 of the
sight glass, as illustrated in figure behind.
WARNING
The gas content into the R290 is
flammable. The chiller should be
installed only outside and away from
any heat source and sunlight protected.
Max Temp = +50.0 °C (storage)
Max Temp = +47.0 °C (operating)
Summary of Contents for PURPLE
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