58
Control System
5.2 Control Logic
(1) Cycle Control
Control Device
Summary of Control
Cooling Operation* Heating Operation Simultaneous Operation
Purpose of
Control
Contents of Control
Purpose of
Control
Contents of Control
Purpose of
Control
Contents of Control
MC
Inverter
Frequency of
Compressor
Cooling
Capacity
Control
Inverter Frequency Control
is carried out to bring the
I.U. air inlet temperature
to temperature setpoint by
evaporation temperature
control.
Heating
Capacity
Control
Inverter Frequency Control
is carried out to bring the
I.U. air inlet temperature
to temperature setpoint by
condensation temperature
control..
Mainly Cooling:
Cooling Capacity
Control
Inverter Frequency Control is
carried out to bring the Cooling
I.U. air inlet temperature to
temperature setpoint.
Mainly Heating:
Heating Capacity
Control
Inverter Frequency Control is
carried out to bring the Heating
I.U. air inlet temperature to
temperature setpoint.
EVO
Electronic
Expansion Valve
for HEX
HEX SC Control
EVO opening is adjusted
to achieve the target value
of HEX SC.
HEX SH
Control
EVO opening is adjusted to
achieve the target value of
HEX SH.
Mainly Cooling:
SC-Pd Control
EVO opening is adjusted to
achieve the target value of SC-
Pd.
Mainly Heating:
HEX SH Control
EVO opening is adjusted to
achieve the
target value of HEX SH.
MV5
Electronic
Expansion Valve
for Inverter
Radiation
Inverter
Temperature
Control
MV5 opening is adjusted
to suppress Inverter
Temperature Increase.
Inverter
Temperature
Control
MV5 opening is adjusted
to suppress Inverter
Temperature Increase.
Inverter
Temperature
Control
MV5 opening is adjusted to
suppress Inverter Temperature
Increase.
EVB
Electronic
Expansion Valve
for plate Type
HEX
Compressor
discharge
temperature and
SC
of liquid
refrigerant
EVB opening is adjusted
to
achieve the target value
of compressor discharge
temperature and SC of
liquid refrigerant
Compressor
discharge
temperature
and SC
of liquid
refrigerant
EVB opening
is adjusted to achieve the
target value of compressor
discharge temperature and
SC of liquid refrigerant
Compressor
discharge
temperature and
SC
of liquid
refrigerant
EVB opening is adjusted to
achieve the target value
of compressor discharge
temperature and SC of liquid
refrigerant
EVI
Electronic
Expansion Valve
for Indoor Unit
I.U. HEX SH
Control
EVI opening is adjusted to
achieve the target value of
I.U. HEX SH.
I.U. HEX SC
Control
EVI opening is adjusted to
achieve the target value of
I.U. HEX SC.
Cooling
Operation I.U.:
I.U. HEX SH
Control
EVI opening is adjusted to
achieve the target value of I.U.
HEX SH.
Heating
Operation
I.U.: I.U. HEX
SC
Control
EVI opening is adjusted to
achieve the target value of I.U.
HEX SC.
SVA
Solenoid Valve
to Bypass High/
Low Pressure
1. Pd Increase
Protection
2. Ps Decrease
Protection
1.Pd< 522psi(3.6MPa)
Open
2.Ps< 29psi(0.2MPa):
Open
1. Pd
Increase
Protection
2. Ps
Decrease
Protection
1.Pd> 522psi(3.6MPa):
Open
2.Ps< 29psi(0.2MPa):
Open
1. Pd Increase
Protection
2. Ps Decrease
Protection
1. Pd> 522psi(3.6MPa):
Open
2. Ps< 29psi(0.2MPa):
Open
SVC
Solenoid Valve to
Bypass Inverter
Radiation Piping
1. Inverter
Condensation
Protection
2. Pd Decrease
Protection
1. Tf<ambient Temperature
: Open
2.Pd<232psi(1.6MPa):
Open
1. Pd
Decrease
Protection
1.Pd<232psi(1.6MPa):
Open
1. Inverter
Condensation
Protection
2. Pd Decrease
Protection
1. Tf<ambient Temperature :
Open
2. Pd< 232psi(1.6MPa):
Open
SVG
Solenoid Valve
for Blocking
High/Low
Pressure
Blocking High/
Low Pressure
Gas Bypass
during Stoppage
During Operation: Open
During Stoppage: Close
Blocking
High/ Low
Pressure
Gas Bypass
during
Stoppage
During Operation: Open
During Stoppage: Close
Blocking High/
Low Pressure
Gas Bypass
during Stoppage
During Operation: Open During
Stoppage: Close
(*): Dry operation is included in the cooling operation.
Pd: Discharge Pressure
Ps: Suction Pressure
SH: Superheat
SC: Subcool
Tf: Inverter Temperature
I.U.: Indoor Unit
HEX: Heat Exchanger
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