172

 

 

 

 

 

 

Phenomenon which appears as result

 

 

 

 

 

 

 

Correspon

 

(Corresponding indoor unit or flow selector unit)

 

 

Example of

 

 

 

 

 

 

 

 

 

 

 

Part name

Trouble mode

Operation mode

 

 

 

 

l Abnormal

 

 

Judgment and position to be checked

ding indoor

 

 

 

May become

 

 

refrigerant

 

 

 

unit

Not

 

Not

cooling sound

Detection of

 

 

flow

 

 

 

 

almost normal

 

 

 

 

 

 

cooled

 

heated

¡ Circulating

check code

 

 

 

 

 

 

 

 

capacity

 

 

 

 

 

 

 

 

 

 

 

sound

 

 

 

 

 

 

Single cooling

 

 

 

 

 

l Indoor unit,

 

 

 

 

 

 

Simultaneous cooling (Indoor cooling)

 

 

 

 

¡

 

Operation is changed from heating to cooling.

 

 

 

 

 

 

 

Selector unit

 

 

 

 

Simultaneous heating (Indoor cooling)

 

 

 

 

 

 

 

 

 

 

Clogging

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Single heating

 

 

 

 

 

l Indoor unit,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SVSS valve

 

Simultaneous cooling (Indoor heating)

 

 

 

 

¡

 

Refrigerant impact sound is heard at defrost time.

 

 

 

 

 

 

Selector unit

 

 

 

Simultaneous heating (Indoor heating)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Single heating

 

 

 

 

 

 

 

• Refrigerant sound may be heard from SVSS valve

 

 

 

 

 

 

 

 

 

 

 

circuit.

 

 

Leakage

Simultaneous cooling (Indoor heating)

 

 

 

 

¡

¡ SVSS circuit

 

 

 

 

 

 

 

 

 

Temperature of suction gas pipe at outdoor side of the

 

 

 

Simultaneous heating (Indoor heating)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

selector unit is higher than that of normal selector unit.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Single cooling (SV11 ON)

 

 

 

 

 

 

 

 

 

 

 

 

Simultaneous cooling (Indoor cooling)

¡

 

 

 

 

 

P15

• Gas short is observed and PD and PS may be lower

 

 

Check valve

Simultaneous heating (Indoor cooling)

 

 

 

 

 

 

 

Discharge–Liquid

 

 

 

 

 

 

 

[Gas leak

 

than those in normal time.

 

Capillary clogging

Single heating

 

 

 

 

 

 

 

 

 

 

 

 

 

 

detection]

• TD and TS may be higher than those in normal time.

 

bypass capillary,

 

Simultaneous cooling (Indoor heating)

 

¡

 

 

 

 

 

 

Check valve

 

 

 

 

 

 

 

 

 

 

 

Simultaneous heating (Indoor heating)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check valve

Single cooling (SV11 OFF)

¡

 

 

 

 

¡ Check valve

 

• Refrigerant sound may be heard from check valve.

 

 

leakage

 

 

 

 

circuit

 

Discharge gas pipe is cold or it may be frozen.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Piping

Incorrect piping

Single cooling

 

 

 

 

 

 

 

• TCJ and TC1 are heated same as heating.

 

Discharge pipe

¡

 

 

 

 

 

 

 

(Heating circuit)

 

Discharge pipe

Simultaneous cooling (Indoor cooling)

 

 

 

 

 

 

 

 

Liquid pipe

 

 

 

 

 

 

Discharge gas pipe at outdoor side of selector unit is

 

Suction gas pipe

Simultaneous heating (Indoor cooling)

 

 

 

 

 

 

 

 

Gas pipe

 

 

 

 

 

 

 

 

fairly heated.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Signal line

Disconnection

 

 

 

 

 

 

 

 

 

 

 

Contact error

 

 

 

 

In some cases, phenomena such as above occur.

 

 

 

Power supply line

 

 

 

 

 

 

 

Miswiring

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Page 172
Image 172
Toshiba MMU-AP0091H service manual 172, May become, Detection Flow Almost normal Cooled