39
Make sure power is removed from
the unit before performing the main-
tenance items contained in this sec-
tion.
GENERAL
A planned program of regularly scheduled maintenance
will return dividends by averting possible costly and
unexpected periods of down time. It is the responsibility
of the owner to provide the necessary maintenance
for the air handling units and coils. If a system failure
occurs due to improper maintenance during the warranty
period, YORK will not be liable for costs incurred to
return the unit to satisfactory operation.
PERIODIC MAINTENANCE – MONTHLY
Filters
Check the cleanliness of the filters and replace or clean
as required.
Linkages
If the unit is equipped with an air side economizer
examine the damper and the operator linkages to insure
that each is free and operating smoothly.
Compressors
Oil Level Check:
The oil level can only be tested when
the compressor is running in stabilized conditions, to
ensure that there is no liquid refrigerant in the lower
shell of the compressor. When the compressor is running
in stabilized conditions, the oil level must be between
1/4 and 3/4 in the oil sight glass.
Note: at shutdown,
the oil level can fall to the bottom limit of the oil sight
glass.
Oil Analysis
Use YORK Type “R” mineral oil (tinted yellow) for units
charged with R-22 refrigerant. The type of refrigerant
and amount per system is listed in Section 2 of this
manual and on the unit rating plate. A change in oil
color or odor may be an indication of contaminates in the
refrigerant system. If this occurs, an oil sample should
be taken and analyzed. If contaminates are present, the
system must be cleaned to prevent compressor failure.
This can be accomplished through the installation of
oversized suction and liquid line driers. The driers may
have to be changed several times to clean up the system
depending on the degree of contamination.
Never use the scroll compressor
to pump the refrigerant system down
into a vacuum. Doing so will cause
internal arcing of the compressor
motor, which will result in failure of
compressor.
Fan Bearing Lubrication
Add grease slowly with shaft rotating until a slight
bead forms at the seals. If necessary, re-lubricate while
bearing is stationary.
Refer to Table 12 for lubricating
schedule.
Relubrication is generally accompanied by a temporary
rise in operating temperature. Excess grease will be
purged from the seals.
Recommended Lubricant for Fan Bearings
A Lithium / Petroleum base grease conforming to an
NLGI Grade II consistency is normally used. Lubricant
must be free of any chemical impurities such as free
acid or free alkali, dust, rust, metal particles or abrasive.
This light viscosity, low torque grease is rust inhibited
and water resistant, has a temperature range of -30°F
to +200°F with intermittent highs of +250°F. Lubricate
bearings as required by the severity of required duty.
TABLE 12 – FAN BEARING – LUBRICATION INTERVALS
RELUBRICATION SCHEDULE (MONTHS) BALL BEARING PILLOW BLOCKS
SPEED (RPM)
500
1000
1500
2000
2500
3000
3500
4000
4500
SHAFT DIA
1/2” thru 1-11/16”
6
6
5
3
3
2
2
2
1
1-15/16” thru 2-7/16”
6
5
4
2
2
1
1/2
1/4
1/4
2-11/16” thru 2-15/16”
5
4
3
2
1
1/2
1/2
3-7/16” thru 3-15/16”
4
3
2
1
1/2
1/2
4
JOHNSON CONTROLS
FORM 145.05-NOM1 (708)
SECTION 4 – MAINTENANCE
Summary of Contents for York VERSECON YSWD 012
Page 12: ...12 JOHNSON CONTROLS FORM 145 05 NOM1 708 THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 58: ...58 JOHNSON CONTROLS FORM 145 05 NOM1 708 THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 106: ...106 JOHNSON CONTROLS FORM 145 05 NOM1 708 THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 112: ...112 JOHNSON CONTROLS FORM 145 05 NOM1 708 THIS PAGE INTENTIONALLY LEFT BLANK ...
