Johnson Controls ENVIRO-TEC MQL B Series, Manual

Page: 21 / 36

4
PERIODIC MAINTENANCE AND SERVICE
General
The following checklist is provided as an abbreviated
guide to periodic maintenance. Detailed procedural in-
formation is given after this checklist.
After 48 Hours of Operation
Belts will achieve their permanent stretch and will re-
quire re-adjustment, make sure not to over-tighten. See
Belts on page 27 for adjustment instructions.
Weekly
Observe unit weekly for any changes in running condi-
tion and unusual noise.
Every Month
• Check air filters. Clean or replace if clogged or
dirty.
• Re-lubricate fan bearings if operating conditions
include high speeds, moist or dirty air, or high
temperatures.
• Re-lubricate motor bearings in accordance with
motor manufacturer’s recommendations if operat-
ing conditions include high speed, moist or dirty
air, or high temperatures. See motor label (
Motor
on page 23) .
• Check and adjust fan belt tension.
Every Three to Six Months
• Check fan bearing grease line connections. Lines
should be tight to the bearings.
• Re-lubricate fan bearings.
• Check motor lubrication. Recommendations are
provided on the motor label.
• Check bearing and motor bracket bolt torque (see
Table 1 on page 22
).
• Align fan and motor sheaves. Tighten sheave set-
screws to the proper torque (see
Table 1 on page
22 ).
• Check and adjust fan belt tension.
• Tighten electrical connections
• Inspect coils for dirt build-up or coil freeze-up.
Every Year
• Inspect the units casing for corrosion. If damage
is found, clean and paint the surface with a rust-
resistant primer and vinyl chlorinated lacquer.
• Clean the fan wheel and fan shaft. Remove rust
with an emery cloth and apply a coat of heavy
duty rust inhibitor.
• Clean the coils. Using a fin comb straighten any
bent fins.
• Inspect the condensate pan and drain line; remove
sludge or foreign materials that might obstruct
proper drainage. Remove obstructions.
• Check damper linkages, set screws and blade ad-
justment. Clean, but do not lubricate, the nylon
damper rod bushings.
• Clean damper operators.
• Inspect the control and power box wiring for se-
cure connections and insulation.
• Rotate the fan wheel and check for obstructions
in the fan housing. The wheel should not rub on
the fan housing. Adjust the wheel to center if nec-
essary and tighten wheel setscrews to the proper
torque (see Table 1 on page 22 ).
• Check condition of gasketing and insulation
around unit, door and dampers. Repair or replace
as necessary.
• Examine flex connections for cracks or leaks. Re -
pair or replace damaged material.
SECTION 4 - PERIODIC MANINTENANCE AND SERVICE
JOHNSON CONTROLS
21
FORM ET102.19-NOM1
ISSUE DATE:08/26/2013