Emerson VSS, VSR, VSM service manual Installation, Viii. Maintenance Suggestions

Installation

should show no bubbles, and there will be a liquid seal in the receiver. If these two condi- tions are not satisfied, additional refrigerant must be added.

5.When sufficient refrigerant has been charged into the system, close the charging and drum valves. Then remove the drum from the system.

6.During the charging period, observe the gauge carefully to insure no operating dif- ficulties. Watch head pressures closely to make sure the condensers are functioning properly.

Since it is usually necessary to use several drums when charging a system, follow the procedures in paragraphs E1 and E2 of the above description when attaching a new drum. After charging, the refrigerant drums should be kept nearby for several days as it is sometimes necessary to add more refrigerant as the system “settles down”.

VIII. MAINTENANCE SUGGESTIONS

Careful checking of a refrigeration system for leaks and proper operation of all components upon installation will start the system on its way to a long life of satisfactory service. To ensure the desired trouble-free operation, however, a systematic maintenance program is a prereq- uisite. The following maintenance schedule is suggested.

A.Daily

1.Check oil levels.

2.Check all pressure and temperature read- ings.

3.Check micronic oil filter inlet and outlet pres- sures for excessive pressure drop. Change filter when pressure drop exceeds 45 psi or every six months, whichever occurs first. For proper procedure for changing micronic oil filter and for charging oil into the system, see Operation Section.

4.Clean strainers each time filter cartridge if replaced.

5.Check compressor sound for abnormal noises.

6.Check shaft seals for excessive oil leakage. A small amount of oil leakage (approxi- mately 10 drops/min) is normal. This allows lubrication of the seal faces.

B.Weekly

(Items 1 thru 6 above plus 7 thru 9)

7.Check the refrigeration system for leaks with a suitable leak detector.

8.Check oil pressures and review micropro- cessor log and log sheets.

9.Check refrigerant levels in vessels.

C.Monthly

(Items 1 thru 8 above plus 9 thru 13)

10.Oil all motors and bearings. Follow manu- facturer’s instructions on lubrication.

11.Check calibration and operation of all controls, particularly safety controls.

12.Check oil cooler for any evidence of cor- rosion, scaling or other fouling.

13.Operate compressor capacity and volume ratio controls through their range both automatically and manually.

D.Trimonthly

(About 2000 operating hours)

Check movement of compressor rotor at drive coupling end to determine bearing float. (Re- fer to Service Section.)

E.Yearly

(Items 1 thru 13 and “D” above plus 14 thru 28)

14. Check entire system thoroughly for leaks.

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