120
RT-SVX34R-EN
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.
☐ Check the fan shaft bearings for wear. Replace the
bearings as necessary.
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 69, p. 120 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;
add grease until a light bead appears all around the
seal. Do not over lubricate!
☐ After greasing the bearings, check the setscrews to
ensure that the shaft is held securely. Make sure
that all bearing braces are tight.
☐ Inspect both the main unit control panel and heat
section control box for loose electrical components
and terminal connections, as well as damaged wire
insulation. Make any necessary repairs.
☐ Gas units only - Check the heat exchanger(s) for any
corrosion, cracks, or holes.
☐ Check the combustion air blower for dirt or
blockage from animals or insects. Clean as
necessary.
NNoottee:: Typically, it is not necessary to clean the gas
furnace. However, if cleaning does become
necessary, remove the burner plate from the
front of the heat exchanger to access the
drum. Be sure to replace the existing gaskets
with new ones before reinstalling the burner.
☐ Open the main gas valve and apply power to the
unit heating section; then initiate a “Heat” test
using the startup procedure described in “Gas Heat
Units,” p. 105.
WWAARRNNIINNGG
HHaazzaarrddoouuss GGaasseess aanndd FFllaammmmaabbllee
VVaappoorrss!!
FFaaiilluurree ttoo oobbsseerrvvee tthhee ffoolllloowwiinngg iinnssttrruuccttiioonnss
ccoouulldd rreessuulltt iinn eexxppoossuurree ttoo hhaazzaarrddoouuss ggaasseess,,
ffuueell ssuubbssttaanncceess,, oorr ssuubbssttaanncceess ffrroomm
iinnccoommpplleettee ccoommbbuussttiioonn,, wwhhiicchh ccoouulldd rreessuulltt iinn
ddeeaatthh oorr sseerriioouuss iinnjjuurryy.. TThhee ssttaattee ooff CCaalliiffoorrnniiaa
hhaass ddeetteerrmmiinneedd tthhaatt tthheessee ssuubbssttaanncceess mmaayy
ccaauussee ccaanncceerr,, bbiirrtthh ddeeffeeccttss,, oorr ootthheerr
rreepprroodduuccttiivvee hhaarrmm..
IImmpprrooppeerr iinnssttaallllaattiioonn,, aaddjjuussttmmeenntt,, aalltteerraattiioonn,,
sseerrvviiccee oorr uussee ooff tthhiiss pprroodduucctt ccoouulldd ccaauussee
ffllaammmmaabbllee mmiixxttuurreess oorr lleeaadd ttoo eexxcceessssiivvee
ccaarrbboonn mmoonnooxxiiddee.. TToo aavvooiidd hhaazzaarrddoouuss ggaasseess
aanndd ffllaammmmaabbllee vvaappoorrss ffoollllooww pprrooppeerr
iinnssttaallllaattiioonn aanndd sseettuupp ooff tthhiiss pprroodduucctt aanndd aallll
wwaarrnniinnggss aass pprroovviiddeedd iinn tthhiiss mmaannuuaall..
☐ Verify that the ignition system operates properly.
Table 69. Grease recommendations
Recommended Grease
Recommended Operating
Range
Exxon Unirex #2
Mobil 532 -20 F to 250 F
Mobil SHC #220
Texaco Premium RB
Coil Cleaning
Regular coil maintenance, including annual cleaning
enhances the unit’s operating efficiency by minimizing
the following:
• Compressor head pressure and amperage draw
• Water carryover
• Fan brake horsepower
• Static pressure losses
At least once each year—or more often if the unit is
located in a “dirty” environment—clean the
evaporator, microchannel condenser, and reheat coils
using the instructions outlined below. Be sure to follow
these instructions as closely as possible to avoid
damaging the coils.
MMaaiinntteennaannccee
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