Hot Gas Defrost Mode (Operation Of Single Heating Only) - Toshiba MMY-MAP0806FT8P-TR Service Manual

4-4. Hot gas defrost mode (Operation of single heating only)

(* This mode operate with -E, -TR and -UK models only.)
Outdoor hrader unit (MMY-MAP1806FT*)
SV52
SV
PMV1
SV12
SV
TE1
PMV4
TE2
SV
SV11
SV
SV5
SV
TL1
SV6
Fusible
plug
FP
SV3D
SV
Liquid tank
SV41
SV
TD1
Comp1
SV14
Check joint
SV3E
（Liquid pipe）
PMV
TCS
SVS
SVD
SVSS
SVDD
TC2 TCJ
Heating
Outdoor unit
4-Way valve ON
SV4(n) OFF(*1)
SV51 OFF
SV52 ON
SV6 Control
SV11 ON
SV12 OFF
SV14 ON Outdoor Fan
(*1) SV4(n) of stopped compressor (n) = ON
The outdoor unit which communication line between indoor and outdoor is connected is the "Header unit".
Other outdoor units are called "Follower units".
Fan Fan
FM FM
Fan motor Fan motor
Right side
TO
Main heat exchanger
Right side sub heat exchanger 2
Right side sub heat exchanger 1
Left side
Main heat exchanger
Left side sub heat exchanger 2
Left side sub heat exchanger 1
4-way
valve
TS1
Low-pressure sensor
Check joint (High-pressure)
TS2
High-pressure sensor
Accumlator
SV2
SV
Oil
separator
SV42
SV3C
SV
TD2
TK4
High
pressure
High
SW
pressure
SW
Comp2
TK1 TK2
Oil header
TK5
SV3A
SV3B SV
Balance pipe
Liquid pipe
Discharge gas pipe
Suction gas pipe
PMV TCS
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 Close PMV FS
PMV4 Close PMV indoor
OFF
( 32 HP system described in the example of ( 18HP + 14HP ))
Outdoor follower unit (MMY-MAP1406FT*)
SV52
SV
PMV1
PMV4
TE2
TL1
Fusible
Check joint
plug
(Low-pressure)
FP
Liquid tank
(SV14)
Check joint
（Liquid pipe）
PMV TCS
SVS
SVD
SVSS
SVDD
TC1 TC2 TCJ
Heating
FS unit / Indoor unit
Stop
ON SVD OFF
OFF SVS OFF
OFF SVDD OFF
OFF SVSS ON
OFF PMV FS Close
Control PMV indoor Close
High-pressure gas refrigerant
Condensed liquid refrigerant
Evaporative gas refrigerant (Low pressure)
− 66 −
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
SV
SV11
SV
SV5
SV
SV6
Check joint (High-pressure)
High-pressure sensor
SV2
SV3D
SV
Oil
SV
separator
SV41 SV42
SV3C
SV SV
TD1 TD2
TK4
Comp1 Comp2
TK1 TK2
Oil header
SV3E
TK5
SV3A
SV3B
SV
PMV TCS
SVS
SVD
SVSS
SVDD
TC1 TC2 TCJ
Stop
Pressure circuit (High-pressure refrigerant)
Low-pressure circuit (Refrigerant recovery line)
TO
4-way
valve
TS1
Low-pressure sensor
Check joint
(Low-pressure)
TS2
Accumlator
0
SVS
TC1