Service manual

Flow of Refrigerant Si18-201
172 Flow of Refrigerant
1. Flow of Refrigerant
1.1 Flow of Refrigerant
Operation Mode
No.
Operating Status
$
: Fixed opening (step)
%: Variable opening
●
: Fully closed status
The figures in ( ) are
for applicable range.
Excess refrigerant
4-way valve EVP
Discharge
Bypass
Motorized
Valve
EVG
Outdoor Unit
Gas Pipe
Motorized
Valve
EVL
Outdoor Unit
Liquid Pipe
Motorized
Valve
EVA,B,C-
Operating Room
Unit
BP Unit each
Room Motorized
Valve
EVA,B,C- Non-
Operating Room
Unit
BP Unit each
Room Motorized
Valve
EVH BP Unit
Bypass
Motorized
Valve
"
Cooling/
Heating
changeover
"
Defrost
control
"
Oil
collection in
heating
"
Capacity
linear
control
"
Equalizing
control
"
Freeze
protection
control
"
Peak cut
control
"
At starting
<Cooling>
"
Surplus
refrigerant
amount
adjustment
"
Target
discharge
pipe
temperature
control
<Heating>
"
Reverse
target
discharge
pipe
temperature
control
"
Capacity
linear
control
(1-step)
<Cooling>
"
Subcooling
control
<Heating>
"
Target
discharge
pipe
temperature
control
"
Main
reducing
valve
"
Refrigerant
distribution
control
<Cooling>
"
Gas pipe
isothermal
control
"
SH control
<Heating>
"
Subcooling
control
<Cooling>
"
Refrigerant
distribution
OFF
<Heating>
"
Target
discharge
pipe
temperature
control
"
Main pipe
liquid
stagnation
prevention
control at
starting
"
Oil return
control
"
Defrost
control
Cooling
1.2 Standby Operation — OFF
$
450 pls
●
0 pls
$
120 pls
●
0 pls
●
0 pls
●
0 pls
1.3
Equalizing Control — OFF
$
450 pls
$
52
→
0
pls
$
450
→
100 pls
●
0 pls
●
0 pls
●
0 pls
1.4
Oil Return
Operation
Main Gas
Pipe Oil
Return
— OFF
%
0~200
%
60~100
or 450
%
100~450
%
52~450
pls
●
0 pls
$
450 pls
1.5
Low Outside Air
Temperature
Cooling
2.5kW
1-Room
Operation
NO OFF
%
0~200
%
0~100
(EVL=0)
●
0 pls
%
52~450
pls
●
0 pls
●
0 pls
1.6
All-Room Operation NO OFF
●
0 pls
%
0~100
(EVL=0)
●
0 pls
%
52~450
pls
●
0 pls
●
0 pls
1.7
Multi-Room
Operation
NO OFF
●
0 pls
%
0~100
(EVL=0)
●
0 pls
%
52~450
pls
●
0 pls
●
0 pls
1.8 (Partial
Loading)
YES OFF
●
0 pls
%
0~450
(EVL
≠
0)
%
12~450
%
52~450
pls
●
0 pls
●
0 pls
1.9
1-Room
Operation
Indoor Unit
Large
Capacity
YES OFF
●
0 pls
%
0~450
(EVL
≠
0)
%
12~450
%
52~450
pls
●
0 pls
●
0 pls
1.10
Indoor Unit
Small
Capacity
(2.5 kW)
YES OFF
%
0~200
%
0~450
(EVL
≠
0)
%
12~450
%
52~450
pls
●
0 pls
●
0 pls
Heating
1.11 Standby Operation — ON
$
450 pls
$
450 pls
●
0 pls
●
0 pls
●
0 pls
●
0 pls
1.12
Equalizing Control — ON
$
450 pls
$
450
→
100 pls
●
0 pls
●
0 pls
●
0 pls
$
0
→
100
→
0 pls
1.13
Oil return Operation — OFF
$
450
→
0
→
150
→
450
pls
●
0 pls
●
0 pls
$
190 pls
●
0 pls
$
0
→
232
→
0 pls
1.14
Defrost — OFF
$
450
→
150
→
450 pls
$
0
→
70
→
0 pls
$
450
→
0
pls
$
190 pls
●
0 pls
$
100 pls
1.15
All-Room Operation NO ON
●
0 pls
●
0 pls
%
0~100
(EVG=0)
%
52~450
pls
%
52~420
pls
●
0 pls
1.16
Multi-Room
Operation
NO ON
●
0 pls
●
0 pls
%
0~100
(EVG=0)
%
52~450
pls
%
52~420
pls
●
0 pls
1.17 (Partial
Loading)
YES ON
●
0 pls
%
0~70
%
0~450
(EVG
≠
0)
%
52~450
pls
%
52~420
pls
●
0 pls
1.18
1-Room
Operation
Indoor Unit
Large
Capacity
YES ON
●
0 pls
%
0~70
%
0~450
(EVG
≠
0)
%
52~450
pls
%
52~420
pls
●
0 pls
1.19
Indoor Unit
Small
Capacity
(2.5kW)
YES ON
%
0~450
%
0~150
%
0~450
(EVG
≠
0)
%
52~450
pls
%
52~420
pls
●
0 pls
——Pump Down Operation — OFF
$
0~450
●
0 pls
$$$$