Fujitsu ASY7-12A - Pipework Guidelines; Indoor Unit Checks; Outdoor Unit Checks; Controller Operation

Trouble Shooting
What the separate wires do in the interconnecting cables
Note – Wires are 240V Live except where marked neutral or Earth or signal.
Cables marked Signal are digital pulses and you should not attempt to measure these with a meter.
Fujitsu Trouble Shooting Guide
A General Guide
Wire E N L 1 2 3 4 5 6
ASY7-12A Earth Neutral Comp+Fan Unused Unused Unused Unused Unused Unused
ASY7-12R Earth Neutral Comp Unused Unused Rev Valve OD Fan Unused Unused
ASY13PS Earth Neutral Line to OD Unused Unused Signal Unused Unused Unused
ASY14A & ABY14-24A Earth Unused Unused Neutral Comp+Fan Unused Unused Unused Unused
ASY17-30A Earth Unused Unused Live to In Neutral Comp+Fan Unused Unused Unused
ASY14-17R & ABY14R Earth Unused Unused Neutral Comp Rev Valve OD Fan Unused Unused
ASY20-30R & ABY18-24R Earth Unused Unused Neutral Comp Fan Hi Rev Valve Fan Low Unused
AUY12-18AG Earth Unused Unused Neutral Comp Fan Hi Fan Low Unused Unused
AUY12-18RG Earth Unused Unused Neutral Comp Fan Hi Rev Valve Fan Low Unused
AUY18-54A, ABY30-54A & ARY24-60A Earth Unused Unused Comp Neutral Live to In Unused Unused Unused
AUY18-54R, ABY30-54R & ARY24-60R Earth Unused Unused Signal Neutral Live to In Unused Unused Unused
Pipework
• Pipesizes and lengths should be as the
relevant Technical Guide
• Bothlinesshouldbeinsulated
• Nolineaccessoriesoroiltrapsshould
be fitted
• Incoolingmodebothpipesshouldbe
between 0 and 10°C - the suction line
should sweat, but not freeze
• Inheatingmodedbothpipesshouldbe
between 30 and 60°C
• Pipeworkshouldberefrigerationquality
• RefrigerantshouldbeR22,unless
stated on the outdoor unit
• Lookforrestrictions.Theycouldcause
compressor failures.
Indoor Unit
• Isitlevel?Haveweadequatedrainage?
• Smellsarealwaysduetositeconditions
or drains
• Flashinglights?=FaultDiagnostics–
see over
• Whenwerethefilterslastcleaned?
• Istheunittoolarge/small
(between 5/20 air circs / hr)
• IsitonTimer/TestMode
Outdoor Unit
• Dischargetemperatureshouldbe
between 50 & 70°C
• Suctiontemperatureshouldbe
between -3 & 4°C
• Iffanswitchesoffcheckforhigh
discharge temperature
• CheckSuctionLineissweating–
problem if not!
• HotRecip.Compressor=PROBLEM!
• Sweating/Frostonexpansionline–
undercharged
Controller
• EE:EEonLCDhandset–
fault diagnostics – see over
• Isthehandsettoofaraway?
• Whenwerethebatteries
changedlast?
• HeatPumpmodels7-14–
NOT auto changeover
• Timerisoneshot,unlessithas
‘repeat’ mode
• Withwiredhandset,check
for interference. Cable should
be screened
• IsitonTimer/TestMode
Wiring
• Ingeneralinterconnectingwiringis
240 Volt, but see chart for details
• WithLCDwiredhandsetmodels,
Terminal 3 is the Live Not Terminal 1
NEVER apply mains voltage to
Terminal 1 on these models
• WithLCDwiredhandsetmodels
wiring should be screened
• CheckVoltagedrops!Checkitisn’t
down to Earth!
• Hasitgotatimeclock/BMS
interface?
• InterconnectingcablesMUSTbe
circular crimped