Refrigerant Recovery From Failed Outdoor Unit (Pump-Down Operation Under Follower Outdoor Unit Backup Scenario) - Toshiba MMY-MAP0804HT8JP Service Manual

4-6. Refrigerant Recovery from Failed Outdoor Unit
(Pump-Down Operation under Follower Outdoor Unit
Backup Scenario)
H e a d r e u i n
PMV1
PMV2
TE1
PMV4 TE2
Pressure sensor
(high pressure)
SV3D
TL
SV
SV41
SV
Liquid tank
TD1
HPS
Compressor
1
SV3A
PMV
TC2
TCJ
Note: The "header unit" is the outdoor unit to which the indoor-outdoor communication
line is connected. All other outdoor units are called "follower units".
( t M M - Y M A P 1 6 0 4 ) *
FM
TO
4-Way valve
SV6
SV
SV
SV2
O.S.
Accumulator
SV42 SV
SV
SV3
SV43
TD2
HPS TD3
HPS
TK
Compressor Compressor
2 3
TK2
TK1
TK3
TK5
SV3E
SV SV3F
SV3B
SV
Balance pipe
Liquid pipe
Gas pipe
Gas pipe
Liquid pipe
PMV
TC1
TC2
TCJ
High-pressure gas or condensate liquid refrigerant
Evaporative gas refrigerant (low-pressure gas)
Normal refrigerant line
Refrigerant recovery line
Failure
PMV1
PMV2
TS1
Liquid line bypass
TL
Pressure sensor
(low pressure)
Liquid
tank
PMV
TC1
TC2
TCJ
Indoor unit
– 67 –
F l o o l w r e u i n ( t M M - Y M A P 1 2 0
FM
TE1
SV
SV5
4-Way valve
Pressure sensor
Pressure sensor
(low pressure)
(high pressure)
SV
SV2
SV3D O.S.
SV
SV41
SV SV
TD2
TD1
HPS HPS
SV3C
A3
TK4
Compressor Compressor
1 2
TK2
TK1
SV3E TK5
SV3A
SV3B
SV
Balance pipe packed valve
= Full opening
Gas-side service valve = Full opening
⇒ Full closure 10 minutes after system startup
Liquid-side service valve
= Full closure
PMV
TC1
TC2
TCJ
(The diagram shows a 28 HP system
(16 HP + 12 HP) as an example.)
4 ) *
TO
TS1
SV42
Accumulator
TC1