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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 manufacturer’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 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 [centi
-
stokes] at 40°C) may be used for relubrication.
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.
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 recommended
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 inter
-
mittent operation. For relubrication guidelines, see Table 48.
NOTE: Tables 47 and 48 state general lubrication
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
LEGEND
S —
Smaller Shaft Housing Size
Table 48 —
Relubrication Intervals
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
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
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.
2. Remove the cooling fan.
3. Blow clean compressed air (not humid) from bottom to
top and simultaneously use a vacuum cleaner at the air
outlet to trap the dust. If there is a risk of the dust
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
alternate lubrication procedure below.
SHAFT SIZE (in.)
GREASE CHARGE (oz)
1
/
2
TO
5
/
8
0.02
3
/
4
0.03
13
/
16
TO 1
0.03
1
1
/
16
TO 1
1
/
4
S
0.06
1
1
/
4
TO 1
7
/
16
0.09
1
1
/
2
TO 1
9
/
16
0.14
1
5
/
8
TO 1
3
/
4
0.16
1
13
/
16
TO 2 S
0.18
2
TO 2
13
/
16
0.25
2
1
/
4
TO 2
7
/
16
0.35
2
1
/
2
TO 2
11
/
16
0.46
2
13
/
16
TO 2
15
/
16
0.48
ENVIRONMENT TEMPERATURE (F)
SPEED (%)
FREQUENCY
Dirty
-20 to 250
0-100
Daily to 1 week
Clean
-20 to 125
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
125 to 175
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
175 to 250
0-100
Daily to 1 week
MAINTENANCE
INTERVAL
Heat sink temperature check and
cleaning
Every 12 Months (More Often If
Operating In A Dusty
Environment)
Main cooling fan replacement
Every Five Years
Capacitor change (frame size R5
and R6)
Every Ten Years
HVAC control panel battery
change
Every Ten Years