RT-SVX069A-EN
31
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..
NNOOTTIICCEE
EEqquuiippmmeenntt DDaammaaggee!!
FFoorrcciibbllyy ttuurrnniinngg tthhee mmoottoorr sshhaafftt ccaann ddaammaaggee
tthhee ggeeaarr ttrraaiinn aanndd mmoottoorr bbeeyyoonndd rreeppaaiirr..
NNeevveerr ttuurrnn tthhee mmoottoorr sshhaafftt bbyy hhaanndd oorr wwiitthh aa
wwrreenncchh..
☐ 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.
☐ Check the fan shaft bearings for wear. Replace the
bearings as necessary.
☐ Check the supply fan belt(s). If the belts are frayed
or worn, replace them. Refer to the “Fan Belt
Adjustment-Belt Drive Units,” p. 29 for belt
replacement and adjustments.
☐ 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 Sample maintenance log table in
Final Process Section. If the operating pressures
indicate a refrigerant shortage, measure the system
superheat and system subcooling. For guidelines, refer
to “Compressor Start-Up,” p. 27.
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
☐ Inspect the unit’s air filters. If necessary, clean or
replace them.
☐ Check supply fan motor bearings; repair or replace
the motor as necessary.
☐ 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.
☐ Verify that the electric heat system operates
properly.
Coil Cleaning
Regular coil maintenance, including annual cleaning
enhances the unit’s operating efficiency by minimizing
the following:
• Compressor head pressure and amperage draw
• Evaporator water carryover
• Fan brake horsepower
• Static pressure losses
• Airflow reduction
At least once each year, or more often if the unit is
located in a “dirty” environment, clean the condenser
coils using the instructions outlined below. Be sure to
follow these instructions as closely as possible to avoid
damaging the coils.
WWAARRNNIINNGG
HHaazzaarrddoouuss CChheemmiiccaallss!!
CCooiill cclleeaanniinngg aaggeennttss ccaann bbee eeiitthheerr aacciiddiicc oorr hhiigghhllyy
aallkkaalliinnee aanndd ccaann bbuurrnn sseevveerreellyy iiff ccoonnttaacctt wwiitthh sskkiinn
oorr eeyyeess ooccccuurrss..
HHaannddllee cchheemmiiccaall ccaarreeffuullllyy aanndd aavvooiidd ccoonnttaacctt wwiitthh
sskkiinn.. AALLWWAAYYSS wweeaarr PPeerrssoonnaall PPrrootteeccttiivvee
EEqquuiippmmeenntt ((PPPPEE)) iinncclluuddiinngg ggoogggglleess oorr ffaaccee sshhiieelldd,,
cchheemmiiccaall rreessiissttaanntt gglloovveess,, bboooottss,, aapprroonn oorr ssuuiitt aass
rreeqquuiirreedd.. FFoorr ppeerrssoonnaall ssaaffeettyy rreeffeerr ttoo tthhee cclleeaanniinngg
aaggeenntt mmaannuuffaaccttuurreerr’’ss MMaatteerriiaallss SSaaffeettyy DDaattaa SShheeeett
aanndd ffoollllooww aallll rreeccoommmmeennddeedd ssaaffee hhaannddlliinngg
pprraaccttiicceess..
MMaaiinntteennaannccee
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