Check Safety and Operating Controls Monthly
To ensure machine protec t ion, the Control Test Au to mated Test should be do ne at least
once per month. See Tabl e 3 for safety control settings.
Changing Oil Filter

19EX Compressors

Change the oil filter on an annual basis or when th e machine is opened for repa irs. The 19EX
compressor has an isola table oil filter so that th e fi lter may be changed with t he 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 powe r to t he oi l pump.
3. Close the oil filter is ol ation valves (Figur e 44, It em s 1 an d 2).
4. Loosen the fil ter holding cl amp, (Figure 44, Item 3).
5. Rotate the filter nut, (Figure 44, Item 4), counterclockwise t o remove the filter housin g.
Keep the filter housing upright to avoid an oil spi ll.
6. Drain the oil; use this oil to obtain an oil analysi s ; rem o ve and replace the filt er c ar t ridges.
Do not use any of the ext ra felt washers supplied with the filters.
7. Bench assemble Item s A - D upsi de down, then slide the f ilter housing (Item 5) ove r the
stack to ensure that the spr ing (Item D) i s centered in the bottom of the housing as