All Heating Mode (Operation Of Heating Only) - Toshiba MMY-MAP0726FT2P-UL Service Manual

5-4. All Heating mode (Operation of heating only)

Oudoor header unit (MMY-MAP0726FT*-UL)
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）
PMV
TCS
SVD
SVSS
SVDD
TC2 TCJ
Heating
Outdoor unit
4-Way valve ON
SV4(n) OFF(*1)
SV5 OFF
SV6 Control
SV11 ON
SV12 OFF
SV14 ON(*2)
SV15 ON
Outdoor Fan
(*1) SV4(n) of stopped compressor (n) = ON
(*2) SV14 of stopped outdoor unit = OFF
(*3) In defrost mode, PMV4 ,PMV FS and PMV indoor 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
Accumlator
SV2
SV
Oil
separator
Fusible
SV42
plug
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 Control Heating thermo ON
SV3B Control SVD
SV3C Control SVS
SV3D Control SVDD
SV3E ON SVSS
PMV1 Control PMV FS
PMV3 Close PMV indoor
PMV4 Close(*3)
Control
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)
PMV1
PMV4
TE2
PMV3
SV5
TL1
Fusible
plug
FP
Liquid tank
FP
(SV14)
Check joint
（Liquid pipe）
PMV TCS
SVS
SVD
SVSS
SVDD
TC1 TC2 TCJ TC1
Heating thermo OFF
FS unit / Indoor unit
Heating thermo OFF
ON SVD ON
OFF SVS OFF
OFF SVDD OFF
OFF SVSS OFF
Close(*3) PMV FS Close(*3)
Control PMV indoor Close(*3)
− 44 −
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
Accumlator
SV2
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
Stop
SVD OFF
SVS OFF
SVDD OFF
SVSS ON
PMV FS Close(*3)
PMV indoor Close(*3)
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