Emergency Operation (All Heating Operation At Backup Of The Header Unit) - Toshiba MMY-MAP0726FT2P-UL Service Manual

5-8. Emergency operation (All heating operation at backup of the header unit)

Oudoor header unit (MMY-MAP0726FT*-UL)
Trouble When PMV leaked, service
valve at liquid side = Close fully
PMV1
TE1
PMV4
TE2
PMV3
SV
SV11
SV
SV5
SV
TL1
SV6
Fusible
plug
FP
SV3D
SV
Liquid tank
SV41
SV
TD1
Comp1
(SV14)
SV3E
Check joint
（Liquid pipe）
Suction gas service valve, dischage pipe service valve = Close full
PMV
TCS
SVD
SVSS
SVDD
TC2 TCJ
Heating
Trouble header outdoor unit
4-Way valve ON
SV4(n) ON
SV5 OFF
SV6 Control
SV11 ON
SV12 OFF
SV14 OFF
SV15 OFF
Outdoor Fan
(*1) SV4(n) of stopped compressor (n) = ON
(*2) SV14 of stopped outdoor unit = OFF
(*3) In defrost mode, PMV4 and PMV FS also open.
The outdoor unit which communication line between indoor and outdoor is connected is the "Header unit".
Other outdoor units are called "Follower units".
Fan
FM
Fan motor
Right side
TO
Main heat exchanger
Right side sub heat exchanger
Left side
Main heat exchanger
Left side sub heat exchanger
SV15
4-way
valve
TS1
Low-pressure sensor
Check joint
(Low-pressure)
Check joint (High-pressure)
High-pressure sensor
TS2
SV2 Accumlator
SV
Oil
separator
Fusible
SV42
SV3C
SV
TD2
TK4
Comp2
TK1 TK2
Oil header
TK5
0
SV3A
SV3B
SV
Balance pipe
Liquid pipe
Discharge gas pipe
Suction gas pipe
PMV TCS
SVS
SVS
SVD
SVSS
SVDD
TC1 TC2 TCJ
Heating
SV3A OFF 4-Way valve
SV3B ON SV4(n)
SV3C OFF SV5
SV3D OFF SV6
SV3E ON SV11
PMV1 Close SV12
PMV3 Close SV14
PMV4 Close SV15
OFF
High-pressure gas refrigerant
Condensed liquid refrigerant
Evaporative gas refrigerant (Low pressure)
( 12 ton system described in the example of ( 6ton + 6ton ))
Outdoor follower unit (MMY-MAP0726FT*-UL)
Temporal set center unit in
emergency operation
PMV1
PMV4
TE2
PMV3
SV5
TL1
Fusible
plug
FP
Liquid tank
plug
FP
(SV14)
Check joint
（Liquid pipe）
PMV TCS
SVS
SVD
SVSS
SVDD
TC1 TC2 TCJ TC1
Stop
Temporal header outdoor unit
ON SV3A Control
OFF(*1) SV3B Control
OFF SV3C Control
Control SV3D Control
ON SV3E ON
OFF PMV1 Control
ON(*2) PMV3 Close
ON PMV4 Close(*3)
Outdoor Fan Control
− 48 −
Fan
FM
Fan motor
Right side
Main heat exchanger
Right side sub heat exchanger
Left side
Main heat exchanger
TE1
Left side sub heat exchanger
SV15
SV
SV11
SV
SV
SV6
Check joint (High-pressure)
High-pressure sensor
SV2 Accumlator
SV3D
SV
Oil
SV
separator
SV41 SV42
SV3C
SV SV
TD1 TD2
TK4
Comp1 Comp2
TK1 TK2
Oil header
SV3E
TK5
0
SV3A
SV3B
SV
PMV TCS
SVS
SVD
SVSS
SVDD
TC2 TCJ TC1
Stop
FS unit / Indoor unit
Heating thermo ON
SVD ON
SVS OFF
SVDD OFF
SVSS OFF
PMV FS Close(*3)
PMV indoor Control
Pressure circuit (High-pressure refrigerant)
Low-pressure circuit (Refrigerant recovery line)
TO
4-way
valve
TS1
Low-pressure sensor
Check joint
(Low-pressure)
TS2
Fusible
plug
FP