JOHNSON CONTROLS
61
SECTION 3 - MAINTENANCE
FORM 102.20-OM2
ISSUE DATE: 6/01/2015
3
For specific fan bearing lubrication, check the instruc-
tion packet attached to the fan housing. Some forward
curved fans are permanently lubricated.
For best results, relubricate the standard pillow block
bearings while in operation if it safe to do so. Add
grease slowly with the shaft rotating until a slight bead
forms at the seals.
If necessary to relubricate while the bearing is station-
ary, refer to the manufacturer’s data for maximum
grease capacity for the size bearing.
Relubrication is generally accompanied by a tempo-
rary rise in operating temperature. Excess grease will
be purged at the seals. Wipe away purged grease after
several hours of operation.
Checking Condition of Extended Lubrication
Lines
Check the lubrication lines, as shown in
for:
•
Cracks and brittleness. Replace as needed.
• Fittings are tight and lube lines tight on fittings.
•
Air bubbles in grease. Disconnect and purge as
necessary.
Recommended Lubricant for Bearings
Use a lithium/petroleum based grease conforming to
an NLGI Grade II consistency. The lubricant must be
free of any chemical impurities such as free acid or
free alkali, dust, rust, metal particles, or abrasives. This
light viscosity, low torque grease is rust inhibited and
water resistant, and 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.
Proper Interval and Quantity
for the proper lubrica-
tion intervals for the bearings listed earlier in this sec-
tion.
The bearing on the split pillow blocks is
1/3 full when only one side of bearing is
completely full of grease.
1. Seal (4)
2. Housing Cap
3. Cap Bolts (2)
4. Locating Ring (2)
5. Lock Nut
6. Lock Washer
7. Tapered Sleeve
8. Bearing
9. Housing Base
LD09648
FIGURE 57 -
SPLIT BEARING (ASSEMBLED)
Fan Bearing Lubrication
If the fans will be down for four weeks or more, prop-
erly apply correct grease and rotate monthly to prevent
moisture from damaging bearings.
Fan bearings on the AHUs are equipped with standard
lubrication fittings. AHUs under 42 in. tall will have
either extended lube lines, enabling lubrication of both
fan bearings from one side of fan as shown in
or optional external lube lines. For
AHUs 42 in. tall and above, extended lube lines and
external lube lines are optional. Some fans will have
permanently lubricated bearings.
FIGURE 58 -
OPTIONAL LUBRICATION LINES
LD09649
