Toshiba HFCR407C - Emergency operation when inverter unit has failed

50
Combined refrigerant piping systematic drawings
Emergency operation when inverter unit has failed
Heat pump system
(Master unit back-up operation: cooling mode)
(indoor unit 1)
Check
joint
Evaporator
Air heat
exchanger
at indoor
side
Pressure
sensor
TC1
TC2
PMV
TA (Ambient sensor)
Strainer
(Indoor unit 2)
Check
joint
Evaporator
Pressure
sensor
TC1
TC2
PMV
TA (Ambient sensor)
Strainer
(Indoor unit 3)
Check
joint
Evaporator
Pressure
sensor
TC1
TC2
PMV
TA (Ambient sensor)
Strainer
MM-A0280HT
Master unit 1 (Inverter)
Propeller fan
Fan motor
M
Condenser
Sensor (TE1)
PMV (A)
Sensor (TS)
4-way valve
Pulse motor valve B
(Cooling bypass)
(PMVB)
Solenoid valve
(SV2)
High pressure
sensor
Sensor
(TK1)
Solenoid valve
(SV3C)
Strainer
Check joint (Pd)
Liquid
tank
Capillary
Capillary
Strainer
Strainer
Capillary
Oil
separator
Sensor
(TD1)
Check
valve
High
pressure
switch
HP
High
pressure
switch
HP
Accumulator
Check joint (Ps)
Strainer
Compressor
Inverter
Fixed-speed
Sensor
(TD2)
Drier (x2)
Sensor
(TK2)
Oil tank
Check
valve
Sensor
(TK3)
Low
pressure
sensor
Check
valve
Capillary
Capillary
Solenoid
valve
(SV3B)
Solenoid valve (SV3A)
Check
valve
Compressor case
oil removal valve
Check
valve
Strainer
Check valve
Service valve (gas side)
Packed valve (oil balancing pipe)
Packed
valve
(liquid
side)
Condenser
Solenoid
valve
(SV42)
MM-A0280HX
Slave unit 2 (Fixed-speed)
Propeller fan
Fan motor
M
Condenser
Sensor
(TE1)
PMV (A)
Liquid
tank
Strainer
Drier (x2)
MM-A0280HX
Slave unit 4 (Fixed-speed)
Service valves closed fully at liquid and gas side
Failure
Sensor (TS)
Accumulator
Check joint (Ps)
Check
valve
Capillary
Solenoid
valve
(SV3B)
Strainer
Temporal set-up master
unit in emergency
(Dotted line) Evaporating gas refrigerant (Low pressure gas)
(Solid line) High pressure gas or compressed liquid refrigerant
4-way valve
Pulse motor valve B
(Cooling bypass)
(PMVB)
Solenoid valve
(SV2)
High
pressure
sensor
Sensor
(TK1)
Solenoid valve
(SV3C)
Strainer
Check joint (Pd)
Capillary
Capillary
Strainer
Capillary
Oil
separator
Sensor
(TD1)
Check
valve
High
pressure
switch
HP
High
pressure
switch
Strainer
Compressor
Fixed-speed
Fixed-speed
Sensor
(TD2)
Sensor
(TK2)
Oil tank
Check
valve
Sensor
(TK3)
Low
pressure
sensor
Capillary
Solenoid valve (SV3A)
Check
valve
Compressor case
oil removal valve
Check
valve
Check valve
Condenser
Capillary
Solenoid
valve
(SV41)
Solenoid
valve
(SV42)
MM-A0280HX
Slave unit 3 (Fixed-speed)
HP
9
Service valve (gas side)
Packed valve (oil balancing pipe)
Packed
valve
(liquid
side)
Service valve (gas side)
Packed valve (oil balancing pipe)
Packed
valve
(liquid
side)
Service valve (gas side)
Packed valve (oil balancing pipe)
Packed
valve
(liquid
side)