Refrigerant System Diagram
Si33-105
34
Function R407C PLUS Series Heat Recovery System
RSEYP24~30KJY1
No.
Name
Code
Function
Remarks
A
Inverter compressor
M1C
Combination of a compressor (inverter compressor) capable of
operating at 29-95 Hz with inverter drive and compressors
(constant-speed compressors) operable only on commercial
power supply achieves multi step control.
B
Constant-speed
compressor 1
M2C
C
Constant-speed
compressor 2
M3C
D
4 way valve
Y1R
Change the refrigerant flow to the main unit heat exchanger 1 and
2, to switch the condenser
↔
evaporator.
E
4 way valve
Y2R
Change the refrigerant flow to the sub-unit heat exchanger to
switch the condenser
↔
evaporator.
F
4 way valve
Y3R
Change the refrigerant flow to the outdoor main unit discharge line
to switch the high temperature high pressure gas
↔
low
temperature & low pressure gas.
J
Electronic expansion valve
Y1E
(For main unit heat exchangers 1)
Provides PI control during evaporator to maintain constant
superheated degree (SH).
Main unit
’
s
left side
exchanger
K
Electronic expansion valve
Y2E
(For main unit heat exchangers 2)
Provides PI control during evaporator to maintain constant
superheated degree (SH).
Main unit
’
s
right side
heat
exchanger
L
Electronic expansion valve
Y3E
(For sub unit’s heat exchanger)
Provides PI control during heating operation to maintain constant
superheated degree (SH).
MSolenoid valve
Y1S
(For auxiliary condensers)
Use for heat exchanger capacity control during simultaneous
cooling / heating operation.
N
Solenoid valve
Y2S
(For hot gas bypass and pressure equalization)
Bypasses hot gas during transitional operation such as defrosting
operation to prevent sudden decrease of low pressure. Also
equalizes pressure to reduce startup load.
O
Solenoid valve
Y3S
(For inverter unit liquid injection)
Provides liquid injection to prevent overheating operation.
P
Solenoid valve
Y4S
(For receivers)
Use for pump-down refrigerant to receiver.
Q
Solenoid valve
Y5S
(For liquid pressure control)
Use for maintaining liquid pressure during heat exchanger capacity
control.
R
Solenoid valve
Y6S
(For constant-speed comp. 1 liquid injection)
Provides liquid injection to prevent overheating operation.
S
Solenoid valve
Y7S
(For constant-speed comp. 2 liquid injection)
Provides liquid injection to prevent overheating operation.
T
High pressure sensor
SENPH
Heating operation: Provides PI control for compressors and heat
exchanger by detecting high pressure.
Cooling operation: Controls compressors to ensure sufficient high
pressure when outside temperature is low.
U
Low pressure sensor
SENPL
Cooling operation: Provides PI control for compressors and heat
exchanger by detecting low pressure.
Heating operation: Controls motorized valves to maintain constant
evaporator superheated degree.
V
High pressure switch
Q1PH
Opens at set pressure of 2.94 MPa to stop operation.
W
High pressure switch
Q2PH
X
High pressure switch
Q3PH
Y
Pressure regulating valve
Pressure relief valve to protect liquid sealing in receiver piping
during transportation or storing.
It opens at 2.65 MPa.
Z
Fusible plug
Plug head melt at 70~75°C around receiver and high pressure and
high temperature refrigerant is relived.
Summary of Contents for R407C PLUS
Page 1: ...System R407C PLUS Series Heat Recovery System Si33 105 Service Manual ...
Page 11: ...Introduction Si33 105 x ...
Page 41: ...Specifications Si33 105 30 Specifications R407C PLUS Series Heat Recovery System ...
Page 147: ...Test Operation Si33 105 136 Test Operation R407C PLUS Series Heat Recovery System ...
Page 263: ...Si33 105 iv Index ...