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SiUS30-1301
Normal Control
Function and Control
53
5.3
Heat Exchange Mode in Heating Operation or
Simultaneous Cooling / Heating Operation
In heating or simultaneous cooling / heating operation, a target condensing and evaporating
temperature can be secured by switching the water heat exchanger of the condensing unit into
evaporator or condensing with load.
One condensin
g
unit installation
Two condensin
g
units installation
D
GR > 0
D
GR < 0
D
GR > 0
Master
u
nit
O
N
(E
v
aporator)
Fo
u
r-
w
ay
v
al
v
e for heat
exchanger [Y7S] (For the
application of heat exchanger)
Content of the control of
electronic expansion
v
al
v
e [Y1E]
Control of heat exchange
capacity
b
alance
Master
u
nit
OFF
(Condenser)
Fo
u
r-
w
ay
v
al
v
e for heat
exchanger [Y7S] (For the
application of heat exchanger)
Content of the control of
electronic expansion
v
al
v
e [Y1E]
Control of heat exchange
capacity
b
alance
N
ote 1:
D
GR = Target of heat exchange capacity
b
alance
– Act
u
al meas
u
rement of heat
b
alance
D
GR > 0: Ins
u
fficient e
v
aporation
(Excessi
v
e condensation)
D
GR < 0: Ins
u
fficient condensation
(Excessi
v
e e
v
aporation)
2: Control of heat exchange capacity
b
alance
Control the electronic expansion
v
al
v
e so that Te or Tc
w
ill o
b
tain the target
v
al
u
e.
Master
u
nit
OFF
(Condenser)
Sla
v
e
u
nit 1
OFF
(Condenser)
Fo
u
r-
w
ay
v
al
v
e for heat
exchanger [Y7S] (For the
application of heat exchanger)
Content of the control of
electronic expansion
v
al
v
e [Y1E]
Control of heat exchange
capacity
b
alance
Control of heat exchange
capacity
b
alance
Master
u
nit
OFF
(Condenser)
Sla
v
e
u
nit 1
O
N
(E
v
aporator)
Fo
u
r-
w
ay
v
al
v
e for heat
exchanger [Y7S] (For the
application of heat exchanger)
Content of the control of
electronic expansion
v
al
v
e [Y1E]
Control of heat exchange
capacity
b
alance
0 p
u
lse
Master
u
nit
OFF
(Condenser)
Sla
v
e
u
nit 1
O
N
(E
v
aporator)
Fo
u
r-
w
ay
v
al
v
e for heat
exchanger [Y7S] (For the
application of heat exchanger)
Content of the control of
electronic expansion
v
al
v
e [Y1E]
Control of heat exchange
capacity
b
alance
Control of heat exchange
capacity
b
alance
Master
u
nit
O
N
(E
v
aporator)
Sla
v
e
u
nit 1
O
N
(E
v
aporator)
Fo
u
r-
w
ay
v
al
v
e for heat
exchanger [Y7S] (For the
application of heat exchanger)
Content of the control of
electronic expansion
v
al
v
e [Y1E]
Control of heat exchange
capacity
b
alance
0 p
u
lse
Master
u
nit
O
N
(E
v
aporator)
Sla
v
e
u
nit 1
O
N
(E
v
aporator)
Fo
u
r-
w
ay
v
al
v
e for heat
exchanger [Y7S] (For the
application of heat exchanger)
Content of the control of
electronic expansion
v
al
v
e [Y1E]
Control of heat exchange
capacity
b
alance
Control of heat exchange
capacity
b
alance
D
GR < 0
D
GR > 0
D
GR < 0
D
GR > 0
D
GR < 0
D
GR > 0
D
GR < 0