4. When the machine pressu re is 5 psi (34 kPa) or less, dr ain the oil reservoir by openin g the
oil charging va lve (Figure 2A or Figure 2B). Slowly open the valve aga inst refrigerant
pressure.
5. Change the oil filter at t his t ime. See Changing Oil Filter section.
6. Change the refriger ant filter at this time, see the nex t section, Refrigerant F ilt er.
7. Charge the machine wit h oil. Charge until the oil level is equal to the oil lev el marked in Step
2. Turn on the power to the oil heater and let the PIC warm it up to at least 140 F (60 C).
Operate the oil pu mp manually, through th e Control Test, for 2 minutes. The oil leve l should
be full in the lower sight glas s for shutdown condi tions. If the oil level is above 1 /2 full in the
upper sight glass, rem ov e the excess oil. The oil leve l should now be equal to the amo unt
shown in Step 2.
Refrigerant Filter
A refrigerant filter /d rier, located on the refr ige rant cooling line to the mot or (Figure 2A or
Figure 2B), should be changed once a year, or more often if filter condi tion indicates a need for
more frequent replac em e nt. Change the filter wit h t he machine pressure at 0 psi g (0 kPa) by
transferring the ref rigerant to the condenser v essel, (if isolation val ves are present), or a storag e
tank. A moisture indicat or sight glass is locat ed be yond this filter to indica te the volume and
moisture in the refrigerant. If the moisture indicator (d ry-eye) indicates moisture, locate the
source of water immedi at ely by performing a thoroug h leak check.