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HVAC Training

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Title:

Chiller Maintenance

Lesson Plan

NMH30C000105

STA made a conservative decision to declare the Chiller inoperable prior to performing these steps

and has every right to do so.

The discrepancy between the Operability level listed in the task and the 40OP are due to

the stand-by vs. operating conditions when the readings are required to be taken.

Action Plan

A pri 4 action has been generated to enhance the recommendations to perform the steps

necessary to validate the sight glass level prior to determining operability.

Enhance the statement in the Essential Chiller weekly tasks to insure the steps to run the

chiller should be taken prior to determining operability and/or corrective actions is

understood by the technicians and Control room staff. It should say something to the

effect; “Sight glass level may not be and accurate indication of the chiller refrigerant

charge due to stacking. The following steps should be performed prior to determining

necessary corrective actions or chiller operability.”

The weekly PM is the time to look over the machine and identify any abnormalities.

Area Operators also perform rounds to evaluate the operability of the chillers.

Review the following examples and discuss the possibility of a reoccurrence.

CRDR #110846 (U1) documents an oil leak identified on the "B" Essential chiller due to the

elbow fitting at the oil cooler inlet.

Description of event:

During Area Operator rounds an oil leak was identified on the "B" Essential Chiller on the elbow

fitting at the oil cooler inlet. With the oil pump running, the leak is approximately 2 drops per

second. Although the chiller is considered operable based on the ability to add oil as necessary to

make up for the leakage, an Operability Determination # 231 is being initiated to formally evaluate

the potential operability impact.

HVAC personnel will be quantifying the leakage to determine the expected duration between oil

additions. The EC Maintenance Engineer (W. Leaverton) was contacted and concurred with these

conclusions. A drip catch has been placed to prevent oil puddle beneath chiller and Work Request

967147 has been initiated.

BACKGROUND

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Carrier 19FA Istruzioni per gli Interventi Pagina 21