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8.8.3 Filter Drier
8.8.3.1 Check Filter Drier
The unit must be running in cool for this test. Check for a restricted or plugged filter drier by feeling the liq-
uid line inlet and outlet connections of the drier cartridge. If the outlet side feels cooler than the inlet side,
then the filter-drier should be replaced.
8.8.3.2 Filter Drier Replacement
1. Pump down the low side. Refer to Section 8.6.2.
2. Remove bracket, loosen the inlet connection to relieve any remaining pressure then remove the filter-drier.
3. Procure new O-rings. Lubricate the O-rings, back side of sleeves and coupling nuts. Using a backup wrench
at each connection torque 30 to 38 ft/lbs (40.7 to 51.5 Nm).
4. Leak check, evacuate and dehydrate, and charge system as required. Refer to Section 8.6.2, Section 8.6.6
and Section 8.6.7.
8.8.4 Receiver Sight Glass Or Fusible Plug Replacement
1. Remove the refrigerant charge. Refer to Section 8.6.2.
2. Loosen the sight glass or fusible plug to relieve any remaining pressure. Remove and discard glass or plug.
3. Using new o-ring, install component. Torque the sight glass to 15 to 25 ft/lbs (20.3 to 33.9 Nm). Torque the
fusible plug to 48 to 96 inch/lbs (5.4 to 10.8 Nm).
4. Leak check, evacuate and dehydrate, and charge system as required. Refer to Section 8.6.2, 8.6.6 & 8.6.7.
8.8.5 Economizer Heat Exchanger
1. Pump down the low side. Refer to
Section 8.6.2
.
2. Ensure the unit will not start automatically by placing the START/RUN-OFF switch in the OFF position and
removing the negative battery cable. Disconnect the high voltage source and lockout/tagout the receptacle.
3. Remove insulation, brackets and clamps from economizer line assemblies as required (refer to Figure
8.22).
4. Remove the economizer expansion valve and liquid injection solenoid valve coils.
5. Remove economizer outlet pressure transducer and economizer outlet temperature sensor.
6. Unbraze four lines at the economizer connections.
7. Note orientation of economizer (mounted with connection markings upside-down). Remove economizer
heat exchanger, bolt replacement economizer heat exchanger in place and rebraze lines by reversing the
previous steps.
8. Leak check, evacuate the unit and charge.
9. Reinstall the economizer outlet pressure transducer, economizer outlet temperature sensor, valve coils and
insulation.
10. Place unit back in service and run Pretrip to check operation.
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