Si-95
Functions
Functions Inverter K Series
15
1.4
Outline of Control
1.4.1
Inverter Compressor, Motorized PI Control
1. Compressor PI control
■
Cooling operation
Controls TeS (target Te value) at constant ··· Constant-level control of Te (low pressure equivalent
saturation temperature)
TeS = 5.5˚C
■
Heating operation
Controls TcS (target Tc value) at constant ··· Constant-level control of Tc (high pressure equivalent
saturation temperature)
TcS = 48˚C
■
Simultaneous cooling/heating operations
Controls TeS and TcS at constant
TeS = 5.5˚C
TcS = 48˚C
∗
TeS setting values
* TcS setting values
2. Motorized valve PI control
Provides PI control for the motorized valves (Y1E and Y2E) to maintain a constant superheat (SH) level at
the outlet of the outdoor heat exchanger (evaporator).
SHs = Ts - Te
SHs = 5˚C
∗
Ts1 :Suction pipe temperature (R4-1T)
Ts2: Suction pipe temperature (R4-2T)
3. Heat exchanger PI control
Provides PI control for the motorized valve (Y1E) to maintain TeS and TcS at constant.
Motorized valve mode
L
M
(Factory setting)
H
2.5
5.5
8.5
L
M
(Factory setting)
H
43
46
49
EV mode
Initial opening
Max. opening
Min. opening
Normal opening
1
Y1E
2000
2000
2000
Fixed at 2000
Y2E
2000
2000
2000
Fixed at 2000
2
Y1E
2000
2000
1400
Heat exchanger PI control
Y2E
0
0
0
Fixed at 0
3
Y1E
750
1400
100
Heat exchanger PI control
Y2E
250
400
100
Motorized valve PI control
4
Y1E
0
0
0
Fixed at 0
Y2E
700
1000
100
Motorized valve PI control
5
Y1E
700
2000
100
Motorized valve PI control
Y2E
500
2000
100
Motorized valve PI control
SI-95.BOOK Page 15 Friday, March 31, 2000 10:59 AM