RT-SVX072A-EN
153
WWAARRNNIINNGG
RRoottaattiinngg CCoommppoonneennttss!!
FFaaiilluurree ttoo ddiissccoonnnneecctt ppoowweerr bbeeffoorree sseerrvviicciinngg
ccoouulldd rreessuulltt iinn rroottaattiinngg ccoommppoonneennttss ccuuttttiinngg
aanndd ssllaasshhiinngg tteecchhnniicciiaann wwhhiicchh ccoouulldd rreessuulltt iinn
ddeeaatthh oorr sseerriioouuss iinnjjuurryy..
DDuurriinngg iinnssttaallllaattiioonn,, tteessttiinngg,, sseerrvviicciinngg aanndd
ttrroouubblleesshhoooottiinngg ooff tthhiiss pprroodduucctt iitt mmaayy bbee
nneecceessssaarryy ttoo wwoorrkk wwiitthh lliivvee aanndd eexxppoosseedd
rroottaattiinngg ccoommppoonneennttss.. HHaavvee aa qquuaalliiffiieedd oorr
lliicceennsseedd sseerrvviiccee iinnddiivviidduuaall wwhhoo hhaass bbeeeenn
pprrooppeerrllyy ttrraaiinneedd iinn hhaannddlliinngg eexxppoosseedd rroottaattiinngg
ccoommppoonneennttss,, ppeerrffoorrmm tthheessee ttaasskkss..
☐ Manually rotate the condenser fans to ensure free
movement and check motor bearings for wear.
Verify that all of the fan mounting hardware is tight.
☐ Verify that all damper linkages move freely;
lubricate with white grease, if necessary.
☐ Check supply fan motor bearings; repair or replace
the motor as necessary. If the unit model number
indicates that the motor has an internal shaft
ground, replace with the same motor type.
☐ Check the fan shaft bearings for wear (FC fans only).
Replace the bearings as necessary. Lubricate the
supply fan shaft bearings with a lithium-based
grease.
NNoottee:: These bearings are considered permanently
lubricated for normal operation. For severe
dirty applications, if relubrication becomes
necessary, use a lithium based grease. See
Table 65, p. 137 for recommended greases.
IImmppoorrttaanntt:: The bearings are manufactured using a
special synthetic lithium-based grease
designed for long life and minimum
relube intervals. Over lubrication can be
just as harmful as not enough.
☐ Use a hand grease gun to lubricate these bearings
(FC fans only); add grease until a light bead appears
all around the seal. Do not over lubricate! After
greasing the bearings (FC fans only), check the
setscrews to ensure that the shaft is held securely
to the bearings and fan wheels. Make sure that all
bearing braces are tight.
☐ Check the supply fan belt(s). If the belts are frayed
or worn, replace them. Refer to the “Fan Belt
Adjustment,” p. 137 for belt replacement and
adjustments.
☐ Check the condition of the gasket around the
control panel doors. These gaskets must fit
correctly and be in good condition to prevent water
leakage.
☐ Verify that all wire terminal connections are tight.
☐ Remove any corrosion present on the exterior
surfaces of the unit and repaint these areas.
☐ Generally inspect the unit for unusual conditions (e.
g., loose access panels, leaking piping connections,
etc.)
☐ Make sure that all retaining screws are reinstalled in
the unit access panels once these checks are
complete.
☐ With the unit running, check and record the
following:
– ambient temperature
– compressor oil level (each circuit)
– compressor suction and discharge pressures
(each circuit)
– superheat and subcooling (each circuit)
Record this data on an “operator’s maintenance log”
like the one shown in Table 75, p. 157. If the operating
pressures indicate a refrigerant shortage, measure the
system superheat and system subcooling. For
guidelines, refer to “Charging by Subcooling ,” p. 119.
IImmppoorrttaanntt:: Do not release refrigerant to the
atmosphere! If adding or removing
refrigerant is required, the service
technician must comply with all federal,
state and local laws. Refer to general
service bulletin MSCU-SB-1 (latest edition).
Heating Season
WWAARRNNIINNGG
HHaazzaarrddoouuss VVoollttaaggee!!
FFaaiilluurree ttoo ddiissccoonnnneecctt ppoowweerr bbeeffoorree sseerrvviicciinngg ccoouulldd
rreessuulltt iinn ddeeaatthh oorr sseerriioouuss iinnjjuurryy..
DDiissccoonnnneecctt aallll eelleeccttrriicc ppoowweerr,, iinncclluuddiinngg rreemmoottee
ddiissccoonnnneeccttss bbeeffoorree sseerrvviicciinngg.. FFoollllooww pprrooppeerr
lloocckkoouutt//ttaaggoouutt pprroocceedduurreess ttoo eennssuurree tthhee ppoowweerr
ccaann nnoott bbee iinnaaddvveerrtteennttllyy eenneerrggiizzeedd.. VVeerriiffyy tthhaatt nnoo
ppoowweerr iiss pprreesseenntt wwiitthh aa vvoollttmmeetteerr..
Before completing the following checks, turn the unit
OOFFFF and lock the main power disconnect switch open.
☐ Inspect the unit air filters. If necessary, clean or
replace them.
☐ Check supply fan motor bearings; repair or replace
the motor as necessary. If the unit model number
indicates that the motor has an internal shaft
ground, replace with the same motor type.
☐ Check the fan shaft bearings for wear. Replace the
bearings as necessary. Lubricate the supply fan
shaft bearings with a lithium-based grease.
NNoottee:: These bearing are considered permanently
lubricated for normal operation. For severe
dirty applications, if relubrication becomes
necessary, use a lithium based grease. See
Table 65, p. 137 for recommended greases.
SSeerrvviiccee aanndd MMaaiinntteennaannccee
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