Toshiba R410A Service Manual page 171

9-8-2. Flow Selector Unit (FS Unit)
Leakage of SVD valve or SVS valve, etc; Positions to be checked and check code when a trouble such as miswiring occurred.
Trouble
Part name Operation mode
mode
All heating operation
Clogging Mainly cooling, part heating operation
Mainly heating, part cooling operation
All cooling operation (SV11 ON)
Leakage Mainly cooling, part heating operation
Mainly cooling, part heating operation
All cooling operation (SV11 OFF)
SVD valve
All cooling operation (SV11 ON)
Miswiring/
Mainly cooling, part heating operation
Misinstallation
Mainly cooling, part heating operation
of coil
SVD SVS
All heating operation
Mainly cooling, part heating operation
Mainly heating, part cooling operation
All cooling operation
Clogging Mainly cooling, part heating operation
Mainly heating, part cooling operation
SVS valve
All heating operation
Leakage
Mainly cooling, part heating operation
Mainly heating, part cooling operation
All heating operation
Clogging Mainly cooling, part heating operation
Mainly heating, part cooling operation
All cooling operation (SV11 ON)
Mainly cooling, part heating operation
Mainly heating, part cooling operation
Leakage
All heating operation
SVDD Mainly cooling, part heating operation
valve
Mainly heating, part cooling operation
Miswiring/
All cooling operation (SV11 ON)
Misinstallation
Mainly cooling, part heating operation
of coil
Mainly heating, part cooling operation
SVD SVS
All heating operation
Mainly cooling, part heating operation
Mainly heating, part cooling operation
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
All
¡
Heating unit
Heating unit
All
¡
Cooling unit
Cooling unit
¡
All
All
¡
Cooling unit
Cooling unit
All
¡
Heating unit
Heating unit
All
¡
Cooling unit
Cooling unit
All
¡
Heating unit
Heating unit
All
¡
Heating unit
Heating unit
All
¡
Cooling unit
Cooling unit
All
¡
Heating unit
Heating unit
All
¡
Cooling unit
Cooling unit
All
¡
Heating unit
Heating unit
Abnormal
Judgment and position to be checked
cooling sound Detection of
Circulating check code
sound
• TC1 is lower than normal indoor unit.
• Temperature of suction gas pipe at indoor side of the flow selector
unit is lower than that of normal FS unit.
• Compared with normal indoor unit, TCJ is higher.
¡
SVD circuit –
• Suction gas pipe at outdoor side of the flow selector unit is hot.
SVS circuit
• Refrigerant circulating sound is heard in bypass from SVD valve
to SVS valve.
• Refrigerant circulating sound is heard from SVD valve circuit.
¡
SVD circuit
• TCJ is high and SH is little. (Liquid pack)
• Temperature of TCJ and TC1 become high similar to heating. (All
heating circuit)
¡ • Discharge gas pipe at outdoor unit side of the flow selector unit is
SVD circuit
rather hot.
• Refrigerant circulating sound is not heard from SVS valve, but it is
heard from SVD valve.
• Gas pipe at indoor side of the flow selector unit is cold. (Cooling
L18 "Flow
circuit, Liquid pack)
¡
SVS circuit selector unit
• Refrigerant circulating sound is not heard from SVD valve, but it is
error"
heard from SVS valve.
• TCJ is higher than normal indoor unit.
¡
SVSS circuit • Gas pipe at indoor side of the flow selector unit is not cold.
• Refrigerant circulating sound is heard from SVSS valve.
P19 "4-way
• Compared with normal indoor unit, TCJ is low.
valve reversal
¡ • Temperature of suction gas pipe at outdoor side of the flow
error"
SVS circuit
selector unit is higher than that of normal flow selector unit.
• Refrigerant circulating sound is heard from SVS valve circuit.
l
Indoor unit, • In start time, when exchanging mode from cooling to heating after
flow selector unit defrost operation, refrigerant shock sound may be heard.
• Refrigerant circulating sound may be heard from SVDD valve
circuit.
¡
SVDD circuit
• Suction gas pipe at outdoor unit side of the flow selector unit may
be hot.
¡ • Refrigerant circulating sound may be heard from SVDD valve
SVDD circuit
circuit.
• Refrigerant circulating sound may be heard from SVDD valve
¡ circuit.
SVDD circuit
• Suction gas pipe at outdoor unit side of the flow selector unit may
be hot.
l
Indoor unit, • In start time, when exchanging mode from cooling to heating after
flow selector unit defrost operation, refrigerant shock sound may be heard.
Example of
refrigerant
flow
A
B
C