Compressor; Electrical Controls - York YMC2 A Operation And Maintenance

Form 160.78-O1
Issue date: 05/19/2021
of leakage, the corks may blow from the end of a
tube, indicating the location of the leakage. If not,
if will be necessary to make a very thorough test
with the leak detector.
4. After the tubes have been corked for 12 to 24
hours, have two people carefully test each tube at
both ends of the evaporator. One person can re-
move corks at one end of the evaporator and the
second person can remove corks at the opposite
end and handle the leak detector. Start with the top
row of tubes in the section being investigated. Re-
move the corks at the ends of one tube simultane-
ously and insert the exploring tube for 5 seconds.
This should be long enough to draw into the de-
tector any refrigerant gas that might have leaked
through the tube walls. Place a fan at the end of
the evaporator opposite the detector. This ensures
that any leakage wi travel through the tube to the
detector.
5. Mark any leaking tubes for later identification.
JOHNSON CONTROLS
6. If any of the tube sheet joints are leaking, the leak
should be indicated by the detector. If a tube sheet
leak is suspected, its exact location may be found
by using a soap solution. A continuous buildup of
bubbles around a tube indicates a tube sheet leak.

Compressor

Maintenance for the compressor assembly consists of
observing the operation of the compressor.
If the control panel warns of excessive landings of the
magnetic bearing motor, notify the nearest Johnson
Controls office to request the presence of a Johnson
controls Service Technician. The technician can assess
the condition of the touchdown bearings using elec-
tronic tools.

Electrical controls

For information covering the OptiView™ Control
Center operation, refer to the YMC
trol Center Operations Manual (Form 160.78-O2).
Section 3 - Maintenance
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OptiView Con-
2 TM
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