FORM 100.50-NOM6 (1207)

SECTION 4 – MAINTENANCE

Make sure power is removed from the unit before performing the main- tenance items contained in this sec- tion.

GENERAL

Aplanned 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, JOHNSON CONTROLS 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

Examine the damper and 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 “T” POE oil (clear) for units charged with R-410A refrigerant. The type of refrigerant and amount per system is listed on the unit rating plate. A change in the oil color or odor may be an indication of contaminates in the refrigeration system. If this occurs, an oil sample should be taken and analyzed. If contaminations 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

4

Add grease slowly with shaft rotating until a slight bead forms at the seals. If necessary, re-lubricate while bearing is stationary. The fan data plate (attached to the fan scroll) lists the type of grease that must be used for lubricating the bearings. Refer to Table 4-1 for lubricating schedule.

Re-lubrication is generally accompanied by a temporary rise in operating temperature. Excess grease will be purged at 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 4-1 – 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

 

 

 

JOHNSON CONTROLS

55

Page 54 Page 56
Page 55
Image 55
York YPAL 060, YPAL 061, YPAL 050, YPAL 051 manual Maintenance
Page 54 Page 56
Top Page Image Contents