Filter
Top Products
Installation and Maintenance 59
3HULRGLF0DLQWHQDQFH
The following checklist is provided as an abbreviated
guide to periodic maintenance. Detailed procedural
information is given after this checklist.
WARNING
Disconnect electrical power and
allow rotating parts to stop before
servicing the unit. Exercise cau-
tion if unit must be on for test or
maintenance procedures. Failure
to do so may result in injury or
death from electrical shock or
moving parts.
Disconnect electrical power prior
to access into a fan or ductwork.
Even when locked out electrically,
fans may cause injury or damage if
the impeller is subject to “wind-
milling.” The impeller should be
secured to physically restrict rota-
tional movement. Failure to secure
impeller can cause severe per-
sonal injury or death.
After 48 Hours Operation
Belts have acquired their permanent stretch.
Readjust but do not over-tighten. See section titled
“Fan Belt Tension” for instructions.
Weekly
Observe unit weekly for any change in running
condition and unusual noise.
Every Month
q Check air filters. Clean or replace if clogged or
dirty. Coat permanent filters with oil after cleaning.
Change bag filters when pressure drop is 1-inch
W.G.
q Relubricate fan bearings if operating conditions
include high speeds, moist or dirty air, or high
temperatures.
q Relubricate motor bearings in accordance with
motor manufacturer’s recommendations if
operating conditions include high speeds, moist or
dirty air, or high temperatures.
q Check and adjust fan belt tension.
Every Three to Six Months
q Check fan bearing grease line connections. Lines
should be tight to the bearings.
q Relubricate fan bearings.
q Check motor lubrication. Recommendations are
provided on the motor tag or on a unit sticker.
q Check bearing and motor bracket bolt torque.
q Align fan and motor sheaves. Tighten sheave set
screws to the proper torque.
q Check and adjust fan belt tension.
q Tighten electrical connections.
q Inspect coils for dirt build-up or coil freeze-up.
Every Year
q Inspection the unit casing for corrosion. If damage
is found, clean and repaint the surface with a rust-
resistant primer and vinyl chlorinated lacquer.
q Clean the fan wheels and fan shaft. Remove rust
with an emery cloth and apply a coat of LPS #3 or
an equivalent.
q Inspect the condensate drain pan and drain line,
remove sludge or foreign materials that might
obstruct proper drainage. Remove obstacles.
Table 48
Minimum Hex Head Bolt Torque in lb-ft
Grade 5 Bolts
Size (inches*)
Thread
Designation
Min. Torque
1/4, 20
UNC 6
1/4, 28
UNF 7
5/16, 18
UNC 14
5/16, 24
UNF 16
3/8, 16
UNC 24
3/8, 24
UNF 28
7/16, 14
UNC 42
7/16, 20
UNF 45
1/2, 13
UNC 69
1/2, 20
UNF 83
9/16, 12
UNC 99