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START-UP
Before starting unit, check the following and correct as nec-
essary:
• Is unit solidly supported?
• Is fan adjusted for speed and pulley alignment?
• Are pulleys, motor, and bearings securely mounted?
• Are there any loose parts that will rattle or vibrate?
• Is condensate drain pan pitched for correct drainage?
• Are coil baffle plates tight against coil to prevent air
bypass?
• Are all panels securely fastened?
• Are all electrical connections correct and tight?
Also refer to condensing unit instructions before starting a
split system. A split system start-up checklist is provided at the
end of these instructions.
SERVICE
Inspection and maintenance should be performed at regular
intervals and should include the following:
• Complete cleaning of cabinet, fan wheel, cooling coil,
condensate pan and drain, heating coils, and return-air
grille (if present).
• Inspection of panels and sealing of unit against air
leakage.
• Adjustment of fan motor, belt, bearings, and wheels.
• Cleaning or replacement of filters.
• Testing for cooling/heating system leaks.
• Checking of all electrical connections.
Most unit service can be performed by removing one or
both of the unit’s side panels. Coil cleaning or removal or insu-
lation cleaning may require removal of a rear, top, or bottom
panel, depending on the unit’s orientation. When service is
completed, replace unit panels.
Panels — Panels are fastened to unit frame with sheet metal
screws. Fan and coil compartment must be sealed tightly after
service to prevent air from bypassing the cooling coil.
Fan Motor Lubrication — Fan motor supplied with
unit is permanently lubricated and requires no further
lubrication.
Fan Shaft Bearings — Bearings on size 007-012 units
are sealed, permanently lubricated bearings that require no
further lubrication. Size 014-034 units have pillow-block bear-
ings (Fig. 20) that must be lubricated with suitable bearing
grease approximately every 3 months. See Table 7 for suitable
lubricants.
Table 7 — Lubricant Data
*Preferred lubricant because it contains rust and oxidation inhibitors.
MANUFACTURER LUBRICANT
Mobil Mobilplex EP No. 2
Sunoco Prestige 42
Texaco Multifak 2
Texaco Regal AFB-2*
Fig. 19 — Duct Flange Installation
Fig. 20 — Fan Shaft, Bearings, and Fan Wheel
(Typical)