Toshiba MMY-MAP0726FT2P-UL - Emergency Operation (All Cooling Operation at Backup of the Header Unit)

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SVD
SVDD
SVS
SVSS
SV
SV
SV
SV
FS unit Indoor unit
TC2 TCJ TC1
Cooling
PMV
SV
SV
SV
SV
TC2 TCJ TC1
Stop
PMV
SV
SV
SV
SV
TC2 TCJ TC1
Cooling
PMV
SV
SV
SV
SV
TC2 TCJ TC1
Cooling
PMV
SVD
SVDD
SVS
SVSS
SVD
SVDD
SVS
SVSS
SVD
SVDD
SVS
SVSS
Discharge gas pipe
Suction gas pipe
TL1
TS1
SV2
TE1
SV3D
SV3B
SV3A
TD1
TK4
TK5
Fan
Liquid tank
SV6
TO
SV3C
Fan motor
SV
SV5
SV
TD2
SV42
TK2
SV
SV41
TK1
SV
SV
SV
SV
0
SV
SV
FP
TS2
SV
(SV14)
FM
SV
SV
SV11
SV
SV3E
Liquid pipe
Balance pipe
Right side
Main heat exchanger
Left side
Main heat exchanger
Right side sub heat exchanger
Left side sub heat exchanger
High-pressure sensor
Check joint (High-pressure)
Low-pressure sensor
Check joint
(Low-pressure)
Accumlator
Comp1 Comp2
Oil header
Check joint
（Liquid pipe）
PMV PMV PMV PMV
TCS
TCS TCS TCS
5-7. Emergency operation (All cooling operation at backup of the header unit)
Oudoor header unit (MMY-MAP0726FT*-UL) Outdoor follower unit (MMY-MAP0726FT*-UL)
The outdoor unit which communication line between indoor and outdoor is connected is the “Header unit”.
Other outdoor units are called “Follower units”.
4-way
valve
Oil
separator
SV
SV15
PMV4
PMV3
PMV1
TE2
TL1
TS1
SV2
TE1
SV3D
SV3B
SV3A
TD1
TK4
TK5
Fan
Liquid tank
SV6
TO
SV3C
Fan motor
SV
SV5
SV
TD2
SV42
TK2
SV
SV41
TK1
SV
SV
SV
SV
0
SV
SV
FP
TS2
SV
(SV14)
FM
SV
SV
SV11
SV
SV3E
Right side
Main heat exchanger
Left side
Main heat exchanger
Right side sub heat exchanger
Left side sub heat exchanger
High-pressure sensor
Check joint (High-pressure)
Low-pressure sensor
Check joint
(Low-pressure)
Accumlator
Comp1 Comp2
Oil header
Check joint
（Liquid pipe）
4-way
valve
Oil
separator
SV
SV15
PMV4
PMV3
PMV1
TE2
Trouble
When PMV leaked, service
valve at liquid side = Close fully
Temporal set center unit in
emergency operation
Suction gas service valve, dischage pipe service valve = Close full
Fusible
plug
Fusible
plug
Fusible
plug
Fusible
plug
FP
FP
( 12 ton system described in the example of ( 6ton + 6ton ))
High-pressure gas refrigerant
Condensed liquid refrigerant
Evaporative gas refrigerant (Low pressure)
Pressure circuit (High-pressure refrigerant)
Low-pressure circuit (Refrigerant recovery line)
Trouble header outdoor unit Temporal header outdoor unit FS unit / Indoor unit
4-Way valve
OFF SV3A OFF 4-Way valve OFF SV3A Control Cooling thermo ON
SV4(n) ON SV3B OFF SV4(n) OFF(*1) SV3B Control SVD OFF
SV5 ON SV3C OFF SV5 ON SV3C Control SVS ON
SV6 Control SV3D OFF SV6 Control SV3D Control SVDD OFF
SV11 OFF SV3E ON SV11 OFF SV3E ON SVSS ON
SV12 OFF PMV1 Close SV12 OFF PMV1 Close PMV FS Close(*2)
SV14 OFF PMV3 Close SV14 OFF PMV3 Control PMV indoor Control
SV15 OFF PMV4 Close SV15 OFF PMV4 Close(*2)
Outdoor Fan OFF Outdoor Fan Control
(*1) SV4(n) of stopped compressor (n) = ON
(*2) In defrost mode, PMV4 and PMV FS also open.