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Fig. 19 — Duct Flange Installation
START-UP
Before starting unit, check the following and correct as
necessary:
• 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 in-
tervals 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 insulation
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 — Size 25-30 units have pillow-
block bearings (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, contains rust and oxidation inhibitors.
Fig. 20 — Fan Shaft, Bearings, and Fan Wheel (Typical)
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal injury
or death.
Before performing service or maintenance operations on
unit, always turn off main power switch to unit and install
lockout tag. Unit may have more than one power switch.
MANUFACTURER LUBRICANT
Mobil Mobilplex EP No. 2
Sunoco Prestige 42
Texaco Multifak 2
Texaco Regal AFB-2*