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6. CHECKING ELECTRICAL COMPONENTS

6-1 Measurement of Insulation

Resistance

The insulation is in good condition if the 
resistance exceeds 2M

Ω 

6-1-1. Power supply wires

Clamp the grounding terminal of the power plug
with a lead clip of the insulation resistance tester
and measure the resistance by placing a probe 
on both the two power terminals. (fig.1)

Then, also measure the resistance between the
grounding and other power terminals. (fig.1)

6-1-2. Indoor Unit

Clamp a metallic part of the unit with the lead
clip of the insulation resistance tester and measure
the resistance by placing a probe on each terminal
screw where power supply lines are connected on the
terminal plate. (fig.2)

6-1-3. Outdoor Unit

Clamp an aluminium plate fin or copper tube with
the lead clip of the insulation resistance tester
and measure the resistance by placing a probe
on each terminal screw on the terminal plate. (fig.2)
Note that the ground line terminal should be skipped
for the check.

6-1-4. Measurement of Insulation

Resistance for Electrical Parts

Disconnect the lead wires of the desired electric
part from terminal plate, capacitor, etc.
Similary disconnect the connector.
Then measure the insulation resistance. (fig.3 and 4)

NOTE: Refer to electric wiring diagram

If the probe cannot enter the poles because the
hole is too narrow then use a probe with a
thinner pin.

Ground

power plug
(Local supply)

probe

Insulation
tester

Terminal plate

Copper
tube or
metallic part

Clip

Insulation
tester

Probe

Copper
tube or
metallic part

Clip

Insulation
tester

Probe

Clip

Insulation
tester

Probe

Metallic
part

From fan motor,
compressor and
other parts

Fig. 2

Fig. 3

Fig. 4

The shape of the power plug may differ from that

of the air conditioner which you are servicing.

NOTE

Fig. 1

29

Содержание 387106985

Страница 1: ...TECHNICAL DATA SERVICE MANUAL INDOOR UNIT CAF185R5 SPLIT SYSTEM AIR CONDITIONER 0 8180 418 0 07 2005 Model No Product Code No CAF185R5 387106985...

Страница 2: ...w wiring to touch the refrigerant tubing compressor or any moving parts of the fan Do not use multi core cable when wiring the power supply and control lines Use separate cables for each type of line...

Страница 3: ...Mode 13 4 7 Protections in Heat Mode 15 4 8 Sleep Function 18 4 9 Daily Timer 18 4 10 I FEEL Function 18 4 11 Drain Pump Operation 19 5 TROUBLESHOOTING 20 5 1 Check before and after troubleshooting 20...

Страница 4: ...ensions Unit Height mm Width mm Depth mm Ceiling panel Height mm Width mm Depth mm Package dimensions Unit Height mm Width mm Depth mm Volume m3 Ceiling panel Height mm Width mm Depth mm Volume m3 Wei...

Страница 5: ...ype Operating temp Open C Close C Run capacitor F VAC Flap Motor Type Model Rating No of poles rpm Nominal output W Coil resistance Ambient temp 20 C k Heat Exch Coil Coil Rows Fin pitch mm face area...

Страница 6: ...stor Coil sensor TH1 Resistance Thermistor Room sensor TH2 Resistance Drain pump Model Rating Voltage Input Total head capacity Safety float switch Model Contact rating 10 5 10 3 PC 309564003 220 240V...

Страница 7: ...2 DIMENSIONAL DATA Units mm 7...

Страница 8: ...3 ELECTRICAL DATA 3 1 Electric Wiring Diagrams 8...

Страница 9: ...4 1 Cool Mode Operation 4 FUNCTION 9...

Страница 10: ...4 2 Heat Mode Operation 10...

Страница 11: ...4 3 Auto Cool Heat Mode Operation 11...

Страница 12: ...4 4 Dry Mode Operation 12...

Страница 13: ...4 5 Fan Mode Operation 4 6 Protection operations in Cool and Dry Mode 1 Indoor Coil Defrost Protection 5 Protection Operations in Cool and Dry Modes 13...

Страница 14: ...2 Outdoor Coil High Pressure Protection 14...

Страница 15: ...4 7 Protection Operations in Heat Mode 1 Outdoor Coil Deice Protection 15...

Страница 16: ...16...

Страница 17: ...2 Indoor Coil High Pressure Protection in Heat Mode 17...

Страница 18: ...4 8 Sleep Function 4 9 Daily Timer Function 4 10 IFEEL Function 18...

Страница 19: ...ogic 0 and 1 at the float switch pins connector respectively For the Fujitsu version of MCU the Overflow and Normal condition are indicated by a logic 1 and 0 at the float switch pins connector respec...

Страница 20: ...nect power or turn off circuit breaker before you start checking or servicing 5 5 1 5 1 1 5 1 2 5 1 3 5 1 4 5 2 Air conditioner does not operate 5 2 1 Circuit breaker trips or fuse blows A When the ci...

Страница 21: ...to ON Indoor PCB Ass y is defective NO Check power supply Power is being supplied to the indoor unit Circuit breaker is tripped Power failure Reset breaker Wait for recovery or contact power company R...

Страница 22: ...ary and secondary winding of transformer TR Indoor PCB Ass y is defective OK OK Measure resistance of indoor and outdoor fan motor winding FM Measure resistance of compressor motor winding CM OK Repla...

Страница 23: ...ature by temperature setting button button Outdoor unit still does not run Remote control unit is defective Try to run using another remote control unit COOL OK NO Is room temperature too high Try to...

Страница 24: ...tter in bearings Remove foreign matter or repair Repair or replace Measure resistance of outdoor fan motor winding Check fan motor capacitor Measure resistance of flap motor winding Fan cannot be turn...

Страница 25: ...otor winding is abnormally high Refrigerant gas shortage Charge refrigerant gas Measure power supply voltage Rotor may be locked up The voltage is too low 5 3 4 Compressor and outdoor fan do not run F...

Страница 26: ...emote control unit Receiver in lamp ass y may be defective may be defective Measure resistance of 4 way valve s winding COOL to HEAT Check voltage between Outdoor PCB ass y is defective terminals N an...

Страница 27: ...rtage YES Check position of remote control unit Cool or warm air from air conditioner reaches position directly Change position of remote control unit Wide and narrow tubes between indoor unit and out...

Страница 28: ...lampoon on the front side of the indoor unit will flash on and off when the thermistor is defective At the same time the outdoor unit will stop Indoor operate only for ventilation Temperature sensor...

Страница 29: ...sulation resistance tester and measure the resistance by placing a probe on each terminal screw on the terminal plate fig 2 Note that the ground line terminal should be skipped for the check 6 1 4 Mea...

Страница 30: ...then place a probe on the capacitor terminals as shown in fig 7 Observe the deflection of the pointer setting the resistance measuring range of the multimeter to the maximum value The capacitor is go...

Страница 31: ...R D 28 Reyrieux BP 131 01601 Tr voux CEDEX France T l 04 74 00 92 92 Fax 04 74 00 42 00 R C S Bourg en Bresse B 759 200 728...

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