Refrigerant Recovery From Failed Outdoor Unit (Pump-Down Operation Under Follower Outdoor Unit Backup Scenario) - Toshiba MMY-MAP0806HT8(J)P Service Manual

4-7. Refrigerant Recovery from Failed Outdoor Unit
(Pump-Down Operation under Follower Outdoor Unit
Backup Scenario)
Header unit (MMY-MAP1606HT*)
PMV1
PMV3
TE1
TL1
TE2
TL2
TS3
FP
SV3D
Fusible
Oil
Plug
Separator
SV
Liquid tank
SV41
SV
TD1
Sub cool
heat exchanger
圧縮機
１
(ｲﾝﾊﾞｰﾀ)
Compressor
1
PMV4
TK1
TL3
Check joint
TC2 TCJ
Cooling
Header outdoor unit
OFF
4-Way valve SV3A
OFF(*1)
SV4(n) SV3B
ON
SV52 SV3C
Control
PMV1 SV3D
Control Outdoor fan Control
PMV3
Control
PMV4
(*1) SV4 (n) of stopped compressor (n)=ON
(*2) It may be controlled.
The outdoor unit which communication line between indoor and outdoor is connected is the "Header unit".
Other outdoor units are called "Follower units".
Fan
M
Fan motor
Right side
TO
Main heat exchanger
Right side Sub heat exchanger
TG1
Left side
Main heat exchanger TG2
Left side Sub heat exchanger
4-Way valve
TS1
Check Joint
Pressure sensor
(high pressure)
SV2
Accumulator
SV
SV42
SV3C
SV
TD2
TK4
HPS HPS
Compressor
2
TK2
Oil
TK5
Header
SV3A
SV3B
SV
TC1 TC2 TCJ
Trouble outdoor unit
Control
4-Way valve
Control OFF(*1)
SV4(n)
Control
SV52
Control Open(*2)
PMV1
Open(*2) Outdoor fan Control
PMV3
Open(*2)
PMV4
High-pressure gas refrigerant
Condensed liquid refrigerant
( 28 HP system described in the example of (16 HP + 12 HP))
Follower unit (MMY-MAP1206HT*)
PMV1
TL1
Check
Joint
Pressure sensor
TS3
(low pressure)
FP
Fusible
Plug
Liquid tank
Sub cool
heat
exchanger
PMV4
TL3
Check joint
TC1 TC2 TCJ
Cooling
ON Control
SV3A
Control
SV3B
OFF Control
SV3C
Control
SV3D
Evaporative gas refrigerant (Low pressure)
Low-pressure circuit (Refrigerant recovery line)
− 57 −
M
Fan motor
Right side
Main heat exchanger
Left side
Main heat exchanger
TE1
SV
SV52
Liquid line bypass
Check Joint
Pressure sensor
(high pressure)
SV2
SV3D
Oil SV
Separator
SV
SV41 SV42
SV3C
SV
TD1 TD2
TK4
HPS HPS
圧縮機
１
(ｲﾝﾊﾞｰﾀ)
Compressor Compressor
1 2
TK1 TK2
Oil
TK5
Header
SV3A
SV3B
SV
Balance pipe service valve
= Full opening
Gas-side service valve = Full opening
⇒ Full closure 10 minutes after system startup
Liquid-side service valve
= Full closure
TC1 TC2 TCJ
Cooling
Trouble
Fan
TO
4-Way valve
Check
Joint
TS1
Pressure sensor
(low pressure)
Accumulator
SV
TC1
Cooling