104
WARNING
!
DISCONNECT ALL POWER TO UNIT BEFORE SERVICING. CONTACTOR MAY BREAK ONLY ONE SIDE. FAILURE
T
O SHUT OFF POWER CAN CAUSE ELECTRICAL SHOCK RESULTING IN PERSONAL INJURY OR DEATH.
YDEMERESUAC ELBISSOPMOTPMYS
U
nit will not run•Power off or loose electrical connection•Check for correct voltage at compressor contactor in control
box
• Thermostat out of calibration-set too high•Reset
era stcatnoc fi ecalper - lioc rotcatnoc ta stlov 42 rof kcehC•rotcatnoc deliaF•
open
sesuf ecalpeR•sesuf nwolB•
remrofsnart ecalper-gniriw kcehC•evitcefed remrofsnarT•
• High pressure control open (if provided)•Reset-also see high head pressure remedy-The high pressure
control opens at 610 PSIG
• Interconnecting low voltage wiring damaged•Replace thermostat wiring
Condenser fan runs, compressor•Run or start capacitor failed (single phase only)•Replace
doesn’t•Start relay defective 9single phase only)•Replace
- rosserpmoc ta egatlov tcerroc rof kcehC•noitcennoc esooL•
check & tighten all connections
• Compressor stuck, grounded or open motor winding•Wait at least 2 hours for overload to reset.
.rosserpmoc eht ecalper ,nepo llits fI.daolrevo lanretni nepo
gnitar fo %01 nihtiw eb tsum egatlov ,slanimret rosserpmoc tAnoitidnoc egatlov woL•
plate volts when unit is operating.
s
tnenopmoc tik trats ddA•noitidnoc egatlov woL•
d
aol etaluclaceR•tinu dezis ylreporpmI•gnilooc tneiciffusnI
.
not rep MFC 004 yletamixorppa eb dluohs - kcehC•wolfria reporpmI•
.lenap ecivres tinu ot dehcatta erudecorp rep egrahC•egrahc tnaregirfer tcerrocnI•
• Air, non-condensibles or moisture in system•Recover refrigerant, evacuate & recharge, add filter drier
gnitar fo %01 nihtiw eb tsum egatlov ,slanimret rosserpmoc tA•egatlov tcerrocnI•
plate volts when unit is operating.
fo %01 ± eb tsum egatlov ,slanimret rosserpmoc tA•egatlov tcerrocnI•selcyc trohs rosserpmoC
nameplate marking when unit is operating.
egatlov tcerroc rof kcehc - ecalpeR•rotcetorp daolrevo evitcefeD•
tnaregirfer ddA•egrahcrednu tnaregirfeR•
ria ecalper - noitcirtser ecuder ro rewolb fo deeps esaercnI•wolfria rotaropave woL•taews sretsigeR
filter
High head-low vapor pressures•Restriction in liquid line, expansion device or filter drier•Remove or replace defective component
notsip ezis tcerroc ot egnahC•llams oot ezis notsip kcehc wolF•
ylbmessa lioc egnahC•sebut yrallipac tcerrocnI•
VXT ecalpeR•nepo ton seod VXT•
lioc naelC•lioc resnednoc ytriD•ropav lamron ro hgih-daeh hgiH
egrahc metsys tcerroC•egrahcrevo tnaregirfeR•edom gnilooC - erusserp
ecalper ro riapeR•gninnur ton naf resnednoC•
egrahcer & etaucave ,tnaregirfer revoceR•metsys ni selbisnednoc-non ro riA•
rosserpmoc ecalpeR•sevlav rosserpmoC evitcefeD•serusserp ropav hgih-daeh woL
ylbmessa lioc ecalpeR•sebut yrallipac tcerrocnI•
ria ecalper - noitcirtser ecuder ro rewolb fo deeps esaercnI•wolfria rotaropave woL•- rosserpmoc looc - ropav woL
iced evaporator coil filter
tiK tneibmA woL ddA•sroodtuo F°56 woleb gnitarepO•
reird retlif dda - egrahcer & etaucave - tnaregirfer revoceR•metsys ni erutsioM•
noitaluclac daol kcehceR•daol evissecxE•erusserp ropav hgiH
ecalpeR•rosserpmoc evitcefeD•
ecalper - lioc no noitubirtsid ria kcehc - pmalc blub VXT kcehC•gnitnuh VXT•ropav & daeh gnitautculF
pressures TXV
egrahcer & etaucave ,tnaregirfer revoceR•metsys ni selbisnednoc-non ro riA•
egrahcer & etaucave ,tnaregirfer revoceR•metsys ni selbisnednoc-non ro riA•ta esion gnislup ro elgruG
expansion device or liquid line
Circulating air blower & inducer•Manual reset overtemperature control•Reset or replace
run continuously, • tripped
gniriw kcehC•tiucric timil ni esool eriW•trats ton lliw rosserpmoc
COOLING TROUBLE SHOOTING CHART
XVII. TROUBLESHOOTING
FIGURE 59
XVII. TROUBLESHOOTING
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