Fujitsu FO2416RTJNAA - Page 43

43
9.0 DIAGNOSTICS & TROUBLESHOOTING
Diagnostics
9.9 Service Analyzer Charts (cont.)
COMPRESSOR OVERHEATING (cont.)
SYMPTOM POSSIBLE CAUSE CHECK OR REMEDIES
Short cycling of
compressor (cont.)
/RZFKDUJH &KHFNV\VWHPFKDUJH
/RZHYDSRUDWRUDLUÁRZ Dirty coil
'LUW\ÀOWHU
Duct too small or restricted
Faulty run capacitor Replace.
Faulty internal overload Replace compressor.
Faulty Compressor
9DOYHVRUVFUROOV
)DVWHTXDOL]DWLRQ/RZSUHVVXUHGLIIHUHQFH Replace compressor and examine system to
locate reason.
ELECTRICAL
SYMPTOM POSSIBLE CAUSE CHECK OR REMEDIES
9ROWDJHSUHVHQW
on load side of
compressor
contactor and
compressor
ZRQWUXQ
Compressor start components &KHFNVWDUWFDSDFLWRU
&KHFNSRWHQWLDOUHOD\
Run capacitor &KHFNZLWKRKPPHWHU
Internal overload $OORZWLPHWRUHVHW
&RPSUHVVRUZLQGLQJV &KHFNIRUFRUUHFWRKPV
9ROWDJHSUHVHQW
on line side of
compressor
contactor only
Thermostat &KHFNIRUFRQWUROYROWDJHWRFRQWDFWRUFRLO
Compressor control circuit +LJKSUHVVXUHVZLWFK
/RZSUHVVXUHVZLWFK
Ambient thermostat
Solid-state protection control or internal thermal sensors
&RPSUHVVRUWLPHGRIIRQFRQWURORULQWHUORFN
No voltage on line
side of compressor
contactor
%ORZQIXVHVRUWULSSHGFLUFXLWEUHDNHU &KHFNIRUVKRUWLQZLULQJRUXQLW
,PSURSHUZLULQJ 5HFKHFNZLULQJGLDJUDP
Improper voltage High voltage Wrong unit
3RZHUVXSSO\SUREOHP
/RZYROWDJH Wrong unit
3RZHUVXSSO\SUREOHP
Wiring undersized
Loose connections
Single Phasing (3 phase) &KHFNLQFRPLQJSRZHUDQGIXVLQJ
FLOODED STARTS
SYMPTOM POSSIBLE CAUSE CHECK OR REMEDIES
Liquid in the
compressor shell
)DXOW\RUPLVVLQJFUDQNFDVHKHDWHU 5HSODFHRUDGGFUDQNFDVHKHDWHU
Too much liquid in
system
Incorrect piping &KHFNSLSLQJJXLGHOLQHV
Overcharge &KHFNDQGDGMXVWFKDUJH