1) Refrigerant Flow (Automatic Emergency Cooling) - Toshiba MMY-MUP0961HT6P-UL Service Manual

4-5-1. (1) Refrigerant Flow (Automatic emergency cooling)

Header Unit (MMY-MUP1201*, MUP1441*，MUP1681*，MUP096H1* ，MUP120H1*)
M
FAN motor
PMV1
Left side
TL1 Main heat exchanger
Leakage from PMV: TE1
Liquid-side service
valve = Full closure
Left side
Sub heat exchanger
TE2
PMV2
Hot gas heat exchanger
TL2
PMV3
仮
High-pressure
sensor
(TS3)
SV
SV41
Subcool
Heat Exchanger
PMV4
Leakage from PMV:
TL3
Liquid-side service
valve = Full closure
Gas-side service valve
= Full open
TC2 TCJ TC1
Cooling
Trouble header outdoor unit
4-way valve OFF SV3D OFF
PMV1 CLOSE SV3F OFF
PMV2 CLOSE SV4(n) OFF
PMV3 CLOSE SV5B OFF
PMV4 CLOSE Outdoor fan OFF
FAN
FAN
M
FAN motor
TO
Right side
Main heat exchanger
TG1
TG2
Right side
TG3
Sub heat exchanger
TE3
Hot gas heat exchanger
SV5B
SV
Accumulator
SV
SV3D
Highpressure
switch
SV3F
TD1
TK1
TC2 TCJ
Cooling
Temporal header outdoor unit
4-way valve OFF SV3D Control
PMV1 Control SV3F Control
PMV2 Control SV4(n) Control
PMV3 Control SV5B Control
PMV4 Control Outdoor fan 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-MUP0721*, MUP0961*, MUP0721H1*)
Trouble
PMV1
TL1
PMV2
TL2
4-way valve
TS1
Low-pressure
sensor
Fusible
plug
FP
Subcool
Heat Exchanger
PMV4
(TL3)
TC1 TC2 TCJ
High-pressure gas refrigerant
Condensed liquid refrigerant
(18 ton system described in the example of (12 ton + 6 ton)
- 48 -
FAN
M
FAN motor
Main heat exchanger
TE1
Sub heat exchanger
TE2
Hot gas heat exchanger
SV
SV5B
High-pressure
sensor
(TS3)
SV
SV3D
SV
SV41 Highpressure
switch
TD1
TK1
TC1 TC2 TCJ
Cooling
Evaporative gas refrigerant (Low pressure)
Low-pressure circuit (Refrigerant recovery line)
Set Up as Temporary
Header Unit during
Emergency Operation
TO
TG1
TG2
4-way valve
TS1
Low-pressure
sensor
Fusible
plug
Accumulator
FP
SV3F
TC1
Cooling