CHAPTER 3 MAINTENANCE PROCEDURES
Ohaus Corporation www.ohaus.com
3-6
FC5515R Centrifuge Service Manual
3.5.3 Emptying and filling refrigeration system (refrigerant R 404
A/ R 452 A
)
For this performance you need a refrigerant suction plant with container, a vacuum pump, a vacuum
measuring device, a measuring device for refrigerants and a manometer combination.
The refrigeration system has the CFC-free refrigerant type
R 404 A/ 452 A. The serial numbers are
different to the units with R 404 A and R 452 A. See the table below.
Emptying the refrigeration system:
• Remove the housing, until the refrigeration set is exposed.
• Connect the suction plant to the valve.
• Remove the refrigerant from the system.
• You can now perform necessary repairs.
Filling the refrigeration system
:
• Connect the vacuum pump, the manometer combination and the refrigerant bottle
with proper refrigerant
(prescribed on the compressor)
The picture is just symbolic, it is not for the model FC 5515 R!
• Evacuate the refrigeration system for approx. 30 min.
• Switch off the vacuum pump.
• Make sure, the reached vacuum stays constant after switching the pump off, otherwise the
system is leaky.
• Fill the refrigeration set with
the proper amount of prescribed
refrigerant
(prescribed on the compressor).
• Check all tube connections with a leakage detection device for possible leakage.
Figure 54: Compressor.
3-20
Model Voltage R 404 A (250 g) R 452 A (250 g)
FC5
515
R
230V
86
B90….
86
B9
A
0….
FC
5515
R
120V 92B95….
86
B9
A
5….
