Advertisement
Fujitsu Trouble Shooting Guide
A General Guide
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
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.
Wire
ASY7-12A
ASY7-12R
ASY13PS
ASY14A & ABY14-24A
ASY17-30A
ASY14-17R & ABY14R
ASY20-30R & ABY18-24R
AUY12-18AG
AUY12-18RG
AUY18-54A, ABY30-54A & ARY24-60A
AUY18-54R, ABY30-54R & ARY24-60R
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
E
N
L
Earth
Neutral
Comp+Fan
Earth
Neutral
Comp
Earth
Neutral
Line to OD
Earth
Unused
Unused
Earth
Unused
Unused
Earth
Unused
Unused
Earth
Unused
Unused
Earth
Unused
Unused
Earth
Unused
Unused
Earth
Unused
Unused
Earth
Unused
Unused
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
1
2
3
Unused
Unused
Unused
Unused
Unused
Rev Valve
Unused
Unused
Signal
Neutral
Comp+Fan
Unused
Live to In
Neutral
Comp+Fan
Neutral
Comp
Rev Valve
Neutral
Comp
Fan Hi
Neutral
Comp
Fan Hi
Neutral
Comp
Fan Hi
Comp
Neutral
Live to In
Signal
Neutral
Live to In
4
5
6
Unused
Unused
Unused
OD Fan
Unused
Unused
Unused
Unused
Unused
Unused
Unused
Unused
Unused
Unused
Unused
OD Fan
Unused
Unused
Rev Valve
Fan Low
Unused
Fan Low
Unused
Unused
Rev Valve
Fan Low
Unused
Unused
Unused
Unused
Unused
Unused
Unused
Advertisement
