Trane CVHH - Compressor Oil Change; Leak Checking Based on Purge Pump out Time

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Recommended Maintenance

CVHH-SVX001A-EN 93

Compressor Oil Change

After the first six months of accumulated operation, or

after 1,000 hours operation—whichever comes first—it is

recommended to change the oil filter. It is recommended

to subscribe to the Trane annual oil analysis program

rather than automatically change the oil as part of

scheduled maintenance. Change the oil only if indicated

by the oil analysis. Use of an oil analysis program will

reduce the chiller’s overall lifetime waste oil generation

and minimize refrigerant emissions. The analysis

determines system moisture content, acid level, and wear

metal content; it can be used as a diagnostic tool. Due to

the new refrigerant and oil combination, the oil analysis

should be performed by the Trane Chemical Laboratory.

In conjunction with other diagnostics performed by a

qualified service technician, oil analyses can provide

valuable information on the performance of the chiller to

help minimize operating and maintenance costs and

maximize its operating life. An access valve is installed in

the oil supply line, before the oil filter, for obtaining oil

samples.

Notes:

• Use only Trane OIL00022. A full oil change is 79.5 L

(21 gallons).

Leak Checking Based on Purge

Pump Out Time

Figure 52 has been developed to aid in determining when

to do a leak check of a chiller based on the purge pump out

time and unit size. This figure depicts normal purge pump-

out times, small leaks and large leaks based on the chiller

tonnage.

If the purge pump-out time is in the small leak region, then

a leak check should be performed and all leaks repaired at

the earliest convenience. If the purge pump-out time is in

the large leak region, a thorough leak check of the unit

should be performed immediately to find and fix the leaks.

Measu re t h e com p r essor m ot o r w in din g r esi st an ce

to ground; a qualified service technician should

conduct this check to ensure that the findings are

properly interpreted. Contact a qualified service

organization to leak-test the chiller; this

procedure is especially important if the system

requires frequent purging.

(a) Every three years, use a nondestructive tube test to inspect the condenser and evaporator tubes. It may be desirable to perform tube tests on these

com ponents at more frequent intervals, depending upon chiller application. This is especially true of critical process equipment.

(b) Contact a qualified service organization to determ ine when to conduct a complete examination of the unit to discern the condition of the com pressor

and internal components. Check the following: chronic air leaks (which can cause acidic conditions in the compressor oil and result in premature bearing

wear) and evaporator or condenser water tube leaks (water m ixed with the com pressor oil can result in bearing pitting, corrosion, or excessive wear).

Table 20. Recommended maintenance (continued)

Table 21. Recommended maintenance of optional features