Toshiba R410A Service Manual page 172

Part name Trouble mode Operation mode
Single cooling
Simultaneous cooling (Indoor cooling)
Simultaneous heating (Indoor cooling)
Clogging
Single heating
Simultaneous cooling (Indoor heating)
SVSS valve
Simultaneous heating (Indoor heating)
Single heating
Leakage Simultaneous cooling (Indoor heating)
Simultaneous heating (Indoor heating)
Single cooling (SV11 ON)
Simultaneous cooling (Indoor cooling)
Simultaneous heating (Indoor cooling)
Check valve
Discharge–Liquid Capillary clogging Single heating
bypass capillary,
Simultaneous cooling (Indoor heating)
Check valve
Simultaneous heating (Indoor heating)
Check valve
Single cooling (SV11 OFF)
leakage
Piping
Incorrect piping
Single cooling
Discharge pipe
Discharge pipe
Simultaneous cooling (Indoor cooling)
Liquid pipe
Suction gas pipe
Simultaneous heating (Indoor cooling)
Gas pipe
Disconnection
Signal line
Contact error
Power supply line
Miswiring
Phenomenon which appears as result
(Corresponding indoor unit or flow selector unit)
Correspon
l
ding indoor
May become
Not Not
unit
almost normal
¡
cooled heated
capacity
¡
¡
¡
¡
¡
¡
¡
In some cases, phenomena such as above occur.
Abnormal
Judgment and position to be checked
cooling sound
Detection of
check code
Circulating
sound
l
Indoor unit,
• Operation is changed from heating to cooling.
Selector unit
l
Indoor unit,
• Refrigerant impact sound is heard at defrost time.
Selector unit
• Refrigerant sound may be heard from SVSS valve
circuit.
¡
SVSS circuit
• Temperature of suction gas pipe at outdoor side of the
selector unit is higher than that of normal selector unit.
• Gas short is observed and PD and PS may be lower
P15
than those in normal time.
[Gas leak
detection]
• TD and TS may be higher than those in normal time.
¡
Check valve • Refrigerant sound may be heard from check valve.
circuit
• Discharge gas pipe is cold or it may be frozen.
• TCJ and TC1 are heated same as heating.
(Heating circuit)
• Discharge gas pipe at outdoor side of selector unit is
fairly heated.
Example of
refrigerant
flow