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An oil heater is controlled by the PIC to maintain oil tem-

perature above 150 F (65.5 C) or refrigerant temperature plus
70° F (38.9° C) (see the Controls section) when the com-
pressor is off. The LID Status02 screen displays whether the
heater is energized or not. If the PIC shows that the heater
is energized, but the sump is not heating up, the power to the
oil heater may be off or the oil level may be too low. Check
the oil level, the oil heater contactor voltage, and oil heater
resistance.

The PIC will not permit compressor start-up if the oil tem-

perature is too low. The control will continue with start-up
only after the temperature is within limits.

After the initial start or a 3 hour power failure, the con-

trols will allow the machine to start once the oil is up to
proper temperature, but a slow ramp load rate of 2° F
(1.6° C) per minute is used.

Be sure that the hand isolation valves on the oil line near

the filter(s) (Fig. 44, Items 1 and 2) are fully open before
operating the compressor.

Lubrication requirements for the FA coupling and drive

are contained in the manufacturer’s instructions for these
components.

SCHEDULED MAINTENANCE

Establish a regular maintenance schedule based on the ac-

tual machine requirements such as machine load, run hours,
and water quality. The time intervals listed in this section are
offered as guides to service only.

Service Ontime —

The LID will display a SERVICE

ONTIME value on the Status01 screen. This value should
be reset to zero by the service person or the operator each
time major service work is completed so that time between
service can be viewed.

Inspect the Control Center —

Maintenance is lim-

ited to general cleaning and tightening of connections. Vacuum
the cabinet to eliminate dust build-up. In the event of ma-
chine control malfunctions, refer to the Troubleshooting Guide
section for control checks and adjustments.

Be sure power to the control center is off when
cleaning and tightening connections inside the control
center.

Check Safety and Operating Controls Monthly
—

To ensure machine protection, the Control Test Auto-

mated 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 an-
nual 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 ma-
chine. See Fig. 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 (Fig. 44, Items 1

and 2).

4. Loosen the filter holding clamp, (Fig. 44, Item 3).
5. Rotate the filter nut, (Fig. 44, Item 4), counterclockwise

to remove the filter housing. Keep the filter housing up-
right to avoid an oil spill.

6. Drain the oil; use this oil to obtain an oil analysis; re-

move 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 indicated. Screw the assembly into the locking ring.

8. Evacuate the filter/piping assembly.
9. Open the isolation valves.

FA STYLE COMPRESSORS

1. Turn off oil heater.
2. Close the line valve (Fig. 44, Item 1) to isolate the oil

filter(s).
NOTE: FA STYLE COMPRESSORS DO NOT HAVE
ISOLATION VALVE NO. 2, ONLY A CHECK VALVE.
Vent the pressure in the oil filter by opening the Schrader
valve on the oil filter housing. Run a hose from the valve
to a bucket to catch the oil. Check to ensure that the
check valve is properly seating.

3. Loosen the filter holding clamp (Item 3).

Fig. 44 — Removing the Oil Filter