Carrier 19FA Betriebsanleitung PDF herunterladen (Seite 25)

HVAC Training

Page : 25 of 42

Title:

Chiller Maintenance

Lesson Plan

NMH30C000105

pulleys or cable. The guide vane actuator seemed to respond to manual control when

disconnected from

the crank arm linkage.

HVAC Technicians removed the guide vane actuator linkage arm in preparation for pulling the

suction

pipe spool that contains the guide vane mechanism. The technicians noticed a streak of thread

sealer

from the crank arm to the bearing housing yoke for the guide vane shaft. The bearing housing yoke

was

removed and the presence of thread sealer was noted on the guide vane shaft and bearing

housing.

It was discovered that the thread sealer applied under CMWO 2845865 had seeped along the

guide vane

shaft and into the guide vane shaft bushing housing. The thread sealer got between the guide

vane shaft

and the bearing housing yoke. This caused a large drag between the guide vane shaft and the

bushing

housing. The guide vane shaft was no longer free to rotate and resulted in the guide vane actuator

being

unable to respond the changing system cooling demand. The apparent cause of this incident was

too

much thread sealer applied to the set screw threads for the guide vane shaft which contributed to

the

excess sealer being allowed to migrate along the shaft to the bushing housing.

CRDR 3409841

Unit two B normal chiller tripped on low of pressure on start up.

Closed ball valve on oil supply line was not restored after oil filter replacement.

The refrigerant was removed from the machine so there is no advantage to closing the valve to

replace filters.

P.M. now have work instructions to verify the valve is opened before starting chiller.

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Carrier 19FA Betriebsanleitung Seite 25