Sea Frost BG 2000 - Manual (Page 26)

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SPECIAL NOTE
R-404a will become cloudy and indicate similar foaming in the sight glass as the
pressure on the hi-pressure side of the systems becomes too great. Adding charge to
clear this condition will damage the compressor. Be sure you know the pressures you
should have for the corresponding water temperature.
CHECKING THE REFRIGERANT CHARGE
PERIODIC INSPECTION
Checking the refrigerant charge must be incorporated into a routine maintenance
schedule.
1) Locate the RFD (receiver filter drier). It is a blue metal can about 10 inches high and
three inches in diameter, with brass fittings connecting it to copper tubing. The RFD
has a sight glass for viewing the flow of the refrigerant. It is located in the left corner of
the compressor housing.
2) Start the BG 2000. Check to be sure that it is pumping water.
3) MONITOR THE SIGHT GLASS CONTINUALLY. If the sight glass does not show a
presence of refrigerant within a minute of operation the system is empty. TURN OFF
THE SYSTEM, and follow the procedure in the troubleshooting section.
4) If the white foam is evident watch closely for the transition to clear. If the glass
indicates insufficient charge level, additional charge will be needed
5) Feel the SEA FROST plates in the icebox 10 minutes after start up. If the sight glass
clears yet the plate’s temperature does not drop, turn the system off and follow the
procedure in troubleshooting section.
6) If the proper charge is indicated, make ice, go sailing.
DISCHARGING THE SYSTEM (RECLAIMING)
Before the connections or components can be disassembled, the system must be
discharged. Connect a gauge set to the suction service port. Slowly vent the
refrigerant (keeping the pressure under 20 psi) into an approved reclaiming system. Do
not loosen any connections until the gauge on the refrigeration system shows 10”
vacuum for 10 minutes.