Service; Panels; Fan Motor Lubrication; Fan Shaft Bearings - International comfort products FHS Series Installation Instructions Manual

INSTALLER / INSTALLATEUR
TXV superheat must be checked at initial
unit start-up and adjusted if necessary.
Superheat must be 10 - 15 deg F.
La surchauffe TXV doit être vérifiée au
moment de la mise en route initiale et
ajustée si nécessaire. La surchauffe doit
être comprise entre 10 et 15 degrés F.
Fig. 21 — Label, TXV Adjustment

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.
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal injury
or death.
Before performing service or maintenance operations on
unit, turn off main power switch to unit and install lock(s)
and lockout tag(s). Ensure electrical service to rooftop
unit agrees with voltage and amperage listed on the unit
rating plate. Unit may have more than one power switch.
Most unit service can be performed by removing one or
both of the unit's side panels. Coil cleaning or removal or in-
sulation cleaning may require removal of a rear, top, or bot-
tom panel, depending on the unit's orientation. When ser-
vice 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 ser-
vice 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 072-120 units are sealed, permanently lu-
bricated bearings that require no further lubrication. Size
150-336 units have pillow-block bearings (see Fig. 22) that
must be lubricated with suitable bearing grease approxi-
mately every 3 months. See Table 19 for suitable lubricants.
508 01 1603 01
*Preferred lubricant, contains rust and oxidation inhibitors.
40RU500073 2.0

Centering Fan Wheel

If fan and fan shaft assembly are not properly centered,
blades may scrape against the blower side scroll plate or
may create an objectionable whistling noise. It may be nec-
essary to adjust individual fan wheels or move entire fan
shaft. See the following two sections.

Fan Shaft Position Adjustment

Loosen setscrew or locking collar of each fan shaft bearing.
Slide shaft into correct position and replace locking collar
(Fig. 23). To replace locking collar, push collar up against in-
ner face of bearing. Turn collar in direction of fan rotation un-
til tight, and tighten setscrew. Tightening locking collar in di-
rection of fan rotation results in further tightening of collar
should setscrew work itself loose.
Specifications subject to change without notice.
Table 19 — Lubricant Data
MANUFACTURER
Mobil
Sunoco
Texaco
Texaco
Fig. 22 — Fan Shaft, Bearings, and Fan Wheel
(Typical)
Fig. 23 — Fan Shaft Bearing
LUBRICANT
Mobilplex EP No. 2
Prestige 42
Multifak 2
Regal AFB-2*
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