Carrier 17/19EX - Manual (Page 224)

Check Safety and Operating Controls Monthly
To ensure machine protection, the Control Test Automated Test should be done at least
once per month. See Table 3 for safety control settings.
Changing Oil Filter
19EX Compressors
Change the oil filter on an annual basis or when the machine is opened for repairs. The 19EX
compressor has an isolatable oil filter so that the filter may be changed with the refrigerant
remaining in the machine. See Figure 44 . Use the following procedure:
1. Make sure that the compressor is off, and the disconnect for the compressor is open.
2. Disconnect the power to the oil pump.
3. Close the oil filter isolation valves ( Figure 44 , Items 1 and 2).
4. Loosen the filter holding clamp, ( Figure 44 , Item 3).
5. Rotate the filter nut, ( Figure 44 , Item 4), counterclockwise to remove the filter housing.
Keep the filter housing upright to avoid an oil spill.
6. Drain the oil; use this oil to obtain an oil analysis; remove and replace the filter cartridges.
Do not use any of the extra felt washers supplied with the filters.
7. Bench assemble Items A - D upside down, then slide the filter housing (Item 5) over the
stack to ensure that the spring (Item D) is centered in the bottom of the housing as