Carrier 19FA Betriebsanleitung PDF herunterladen (Seite 22)

HVAC Training

Page : 22 of 42

Title:

Chiller Maintenance

Lesson Plan

NMH30C000105

On 10/28/99, the elbow on the inlet line to the oil cooler on essential chiller 1MECBE01 w as

removed and reinstalled (under Corrective Maintenance Work Order 00889903) in an attempt to

eliminate an oil leak in the line. During the performance of this work, the technician had difficulty

removing the elbow from the oil cooler. After repeated attempts, the technician was finally able to

remove the elbow. In the process of removing the elbow, however, an excessive amount of torque

was applied and the elbow was damaged.

Unaware of the damage, the technician reinstalled the elbow and retested the installation. The

retest was satisfactory and the chiller was returned to service. On 11/07/99, Operations personnel

observed that the inlet line to the oil cooler was leaking once again. Engineering and Maintenance

personnel inspected the leak, and it was concluded that the leak was emanating from the inlet

elbow, which was damaged. The damaged elbow was replaced on 11/19/99 under Deficiency

Work Order 00903980. To facilitate the work, the existing union and pipe nipple that are adjacent

to the elbow were also replaced. The installation w as retested satisfactorily and the chiller was

returned to service.

EVALUATION

The crack in the elbow on the inlet line to the oil cooler of essential chiller 1MECBE01 was caus ed

by excessive torque that was applied to the elbow during the implementation of CMWO 00889903.

The elbow w as replaced in an expedient manner. In the period between the discovery of the oil

leak and the replacement of the elbow the quantity of the oil leak was measured closely. At no time

did the oil leak reach the point w here it would impact the operability of essential chiller 1MECBE01

(reference Operability Determination #231).

CRDR #2421005 documents an oil leak caused by a loose clamp on an oil line support.

The loose clamp allowed the line to rub on the bracket until a small hole to develop causing oil and

freon to leak. The oil line was replaced and the bracket secured.

CRDR3 2687930 - Documents an oil leak being identified on (U-2) "B" Essential chiller

On March 3, 2004. D uring routine maintenance activities, an HVAC maintenance technician

discovered oil on the floor under the 2M-ECB-E01 Chiller.

Tracking the path of the oil residue, it appears that the oil is originating from the discharge

temperature sensor component compartment.

The leak was found to be the a RobertShaw temperature sensor model ES11-3000 series

immersion type resistance temperature detector (RTD). The leak was located where the wires exit

the element. The amount of oil was estimated to be approximately 4 ounces.

Cracks in the sensing element for the refrigerant discharge temperature have shown up in some of

the large normal chillers. This is the first time a leak of refrigerant and oil has been identified due to

a leak around the epoxy seal on the refrigerant discharge sensor.

System Engineering has agreed to take an action to identify a replacement sensor for the R obert

Shaw sensor.

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