Compressor; Vibration Analysis; Electrical Controls - York YR TB TB T0 Installation Operation & Maintenance

SECTION 5 – MAINTENANCE
tubes to be further investigated. If the probable
location of the leaky tubes has been determined,
treat that section in the following manner (if the
location is not definite, all the tubes will require
investigation).
2. Wash off both tube heads and the ends of all tubes
with water.
Do not use carbon tetrachloride for this
purpose since its fumes give the same
flame discoloration that the refrigerant
does.
3. With nitrogen or dry air, blow out the tubes to
clear them of traces of refrigerant laden moisture
from the circulation water. As soon as the tubes
are clear, a cork should be driven into each end
of the tube. Repeat this with all of the other tubes
in the suspected section or if necessary, with all
the tubes in the evaporator or condenser. Allow
the evaporator or condenser to remain corked up
to 12 to 24 hours before proceeding. Depending
upon the amount 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 halide torch.
4. After the tubes have been corked for 12 to 24
hours, it is recommended that two men working
at both ends of the evaporator carefully test each
tube – one man removing corks at one end and the
other at the opposite end to remove corks and han-
dle the test torch. Start with the top row of tubes in
the section being investigated. Remove the corks
at the ends of one tube simultaneously and insert
the exploring tube for 5 seconds – this should be
long enough to draw into the detector any refrig-
erant gas that might have leaked through the tube
walls. A fan placed at the end of the evaporator
opposite the detector will assure that any leakage
will travel through the tube to the detector.
5. Mark any leaking tubes for later identification.
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.
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COMPRESSOR

Maintenance for the compressor assembly consists of
checking the operation of the oil return system and
changing the dehydrator, checking and changing the
oil, checking and changing the oil filters, checking the
operation of the oil heater and observing the operation
of the compressor.
Internal wearing of compressor parts could be a seri-
ous problem caused by improper lubrication, brought
about by restricted oil lines, passages, or dirty oil fil-
ters. If the unit is shutting down on High Oil Tempera-
ture (HOT) or Low Oil Pressure (LOP), change the oil
filter element. Examine the oil filter element for the
presence of foreign material. If foreign material is no-
ticeable and the same conditions continue to stop the
unit operation after a new filter element is installed,
notify the nearest Johnson Controls Service Office to
request the presence of a Johnson Controls Service rep-
resentative.

VIBRATION ANALYSIS

Vibration analysis performed at yearly intervals is a
useful diagnostic that can detect internal damage to
rotating machinery and component parts. Contact the
local Johnson Controls Service Office for the Vibration
Analysis Service.

ELECTRICAL CONTROLS

For information covering the MicroComputer Control
Center operation, refer to OptiView Control Center –
Operating and Maintenance (Form 160.81‑O1) and
Wiring Diagrams (Forms 160.81‑PW2), or (160.81‑
PW1).
The operating points of the pressure and temperature
cut outs are shown in the Wiring Diagrams. These dia-
grams also contain a starting and stopping sequence
and timing sequence diagram.
Preventive Maintenance
It is the responsibility of the owner to provide the
necessary daily, monthly and yearly maintenance re-
quirements of the system. IMPORTANT – If a unit
failure occurs due to improper maintenance during
the warranty period; Johnson Controls will not be
liable for costs incurred to return the system to sat-
isfactory operation.
FORM 160.81-NOM1
ISSUE DATE: 10/3/2020
JOHNSON CONTROLS