1) Refrigerant Flow (Automatic Emergency Heating) - Toshiba MMY-MUP0801HT8JP Service Manual

4-5-2. (1) Refrigerant Flow (Automatic emergency heating)

Header Unit (MMY-MUP2401*)
Fan
M
Fan motor
PMV1
Left side Left side Left side
TL1
Main heat exchanger Main heat exchanger Main heat exchanger
TE1
Leakage from PMV
Liquid-side service
valve = Full closure
Left side
Left side Left side
Sub heat exchanger Sub heat exchanger Sub heat exchanger
PMV2
TE2
PMV3
TL2
TS3
High-pressure
sensor
SV3D
SV
Leakage from PMV SV
Liquid-side service
valve = Full closure
SV41
TD1
Subcool
Heat Exchanger
PMV4
TL3
Check joint
Gas-side service valve
= Full open
TC2 TCJ TC1
Heating
Trouble header outdoor unit
4-way valve OFF SV3D OFF
PMV1 CLOSE SV3F OFF
PMV2 CLOSE SV4(n) OFF
PMV3 CLOSE Outdoor fan OFF
PMV4 CLOSE
Trouble
Fan
M
Fan motor
TO
Right side Right side Right side
Main heat exchanger Main heat exchanger Main heat exchanger
TG1
TG2
TG3
Right side Right side Right side
Sub heat exchanger Sub heat exchanger Sub heat exchanger
TE3
4-way valve
TS1
Low-pressure
sensor
Accumulator
SV3F
High- High-
SV
pressure pressure
switch switch
SV42
TD2
TK1 TK2
TC2 TCJ TC1
Heating
Temporal header outdoor unit
4-way valve OFF SV3D Control
PMV1 Control SV3F Control
PMV2 Control SV4(n) Control
PMV3 Control Outdoor fan Control
PMV4 Control
The outdoor unit which communication line between indoor and outdoor is connected is the "Header unit".
Other outdoor units are called "Follower units".
Follower Unit (MMY-MUP1401*)
PMV1
TL1
PMV2
TL2
TS3
SV
SV41
Subcool
Heat Exchanger
PMV4
TL3
Check joint
TC2 TCJ
Heating
High-pressure gas refrigerant
Condensate liquid refrigerant
(38 HP system described in the example of (24 HP + 14 HP))
- 44 -
Set Up as Temporary
Header Unit during
Emergency Operation
Fan
M
Fan motor
TO
TG1
Main heat exchanger Main heat exchanger Main heat exchanger
TE1
TG2
Sub heat exchanger Sub heat exchanger Sub heat exchanger
TE2
High-pressure
sensor
Accumulator
SV3D
SV
SV3F
High-
pressure
switch
TD1
TK1
TC1 TC2 TCJ
Heating
Evaporative gas refrigerant (Low pressure)
Low-pressure circuit (Refrigerant recover line)
4-way valve
TS1
Low-pressure
sensor
TC1