Table of Contents
Advertisement
12. Field balancing of shaft and wheel is recommended.
IMPORTANT: Replacement shafts must have a diameter toler-
ance at bearing mount of +.0000 in./-.001 in. nominal. Carrier
specified parts are recommended.
Motor Location
The motor and motor base must be moved to place the motor at
the front or rear of unit. The proper location is the one that results
in the longest drive centerline distance. The motor may need to be
replaced since the conduit box may need to be reversed: The con-
duit box (if not on top) should always be under the fan shaft for
maximum centerline distance and motor adjustment.
INTERNALLY ISOLATED UNIT
When fan discharge is altered the motor is moved, then all isola-
tors must be re-adjusted to assure proper unit isolation.
Rebalancing of the unit is recommended.
Lubrication
MOTORS
Lubricate in accordance with nameplate attached to motor or with
manufacturer's recommendations.
BEARINGS
Initial Fan Bearing Lubrication
Most bearings are greased when they are manufactured and will
not require additional grease on start-up (verify specific manufac-
turer's recommendations). Some seepage of grease from the seals
is normal during the initial run-in period. For safety purposes, lock
out and tag equipment and wipe up any external grease from the
bearings.
Monitor bearings after they have been run for several minutes.
Check bearings for excessive noise, vibration, and temperature.
Typical operating bearing temperature range should be 100°F to
150°F. The initial temperature may be higher than the expected
steady state temperature.
Bearing Lubrication Instructions
Lithium or lithium complex base grease, conforming to NLGI
(National Lubricating Grease Institute) grade 2 consistency, and
an oil viscosity of 455 to 1135 SUS (Saybolt Universal Seconds)
at 100°F (100 to 250 cSt [centistokes] at 40°C) may be used for re-
lubrication.
Examples: Mobil Mobilith AW2
Mobil Mobilux #2
Shell Alvania #2
Texaco Multifak #2
Texaco Premium RB
Exxon Unirex N2
Amoco Amolith 2
Compatibility of grease is critical; consult with the grease manu-
facturer and/or supplier for current grease specifications to ensure
compatibility.
To lube bearings, use a hand pump grease gun. Always wipe the
fitting and grease nozzle clean to avoid introducing contamination
into the bearing.
IMPORTANT: If possible, it is recommended to lubricate the
bearing while it is rotating, until grease purge is seen from the
seals. If this is not an option due to safety reasons, follow the al-
ternate lubrication procedure below.
For safety, lock out and tag out the fan and restrain rotating com-
ponents. Add one-half the recommended amount shown in
Table 47. Start the fan and run for a few minutes. Stop the fan and
lock out and tag out the unit. Add the second half of the recom-
mended amount. A temperature rise after lubrication, sometimes
30°F (17°C), is normal. Bearing should operate at temperatures
less than 200°F (94°C) and should not exceed 250°F (121°C) for
intermittent operation. For relubrication guidelines, see Table 48.
NOTE: Tables
47
recommendations based on experience and are intended as
suggested or starting points only. For best results, specific
applications should be monitored regularly and lubrication
intervals and amounts adjusted accordingly.
Table 47 — Recommended
Relubrication Grease Charge
SHAFT SIZE (in.)
/
TO
/
1
5
2
8
3
/
4
/
TO 1
13
16
1
1
/
TO 1
1
/
S
16
4
1
/
TO 1
/
1
7
4
16
1
/
TO 1
/
1
9
2
16
1
5
/
TO 1
3
/
8
4
1
/
TO 2 S
13
16
2 TO 2
13
/
16
2
/
TO 2
/
1
7
4
16
2
1
/
TO 2
11
/
2
16
2
/
TO 2
/
13
15
16
16
LEGEND
S — Smaller Shaft Housing Size
Table 48 — Relubrication Intervals
ENVIRONMENT TEMPERATURE (F)
Dirty
-20 to 250
-20 to 125
Clean
125 to 175
175 to 250
LEGEND
NLGI — National Lubricating Grease Institute
NOTE: Use NLGI No. 2 Lithium or Lithium Complex Grease.
Motor and Drive Package Data
Tables 5 and 6 give motor data for forward-curved, airfoil, and
belt-driven plenum fans.
Variable Frequency Drive
If installed in an appropriate environment, the VFD requires very
little maintenance. Table 49 lists the routine maintenance intervals
recommended by Carrier.
Table 49 — Maintenance Intervals
MAINTENANCE
Heat sink temperature check and
cleaning
Main cooling fan replacement
Capacitor change (frame size R5
and R6)
HVAC control panel battery
change
HEAT SINK
The heat sink fins accumulate dust from the cooling air. Since a
dusty heat sink is less efficient at cooling the drive, over tempera-
ture faults become more likely. In a normal environment check the
heat sink annually, in a dusty environment check more often.
Check the heat sink as follows (when necessary):
1. Remove power from drive.
263
and
48
state
general
GREASE CHARGE (oz)
0.02
0.03
0.03
0.06
0.09
0.14
0.16
0.18
0.25
0.35
0.46
0.48
SPEED (%)
FREQUENCY
0-100
Daily to 1 week
0-25
4 to 10 months
26-50
1 to 4 months
51-75
1 week to 1 month
76-100
Daily to 1 week
0-25
2 to 6 weeks
26-50
1 week to 1 month
51-75
Daily to 1 week
76-100
Daily to 1 week
0-100
Daily to 1 week
INTERVAL
Every 12 Months (More Often
If Operating In A Dusty
Environment)
Every Five Years
Every Ten Years
Every Ten Years
lubrication
Advertisement
Table of Contents
