Outline Of Control (Me1 Series) - Panasonic Urban Multi MX1R Series Service Manual

PACD011001C2
1.4

Outline of Control (ME1 Series)

1.4.1 Inverter Compressor, Motorized PI Control
1. Compressor PI control
„ Cooling operation
„ Heating operation
„ Simultaneous cooling/heating operations
∗ 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
Function Urban Multi "MX1, ME1 Series" Using R-22
Controls TeS (target Te value) at constant ··· Constant-level control of Te (low pressure equivalent
saturation temperature)
TeS = 5.5°C
Controls TcS (target Tc value) at constant ··· Constant-level control of Tc (high pressure equivalent
saturation temperature)
TcS = 48°C
Controls TeS and TcS at constant
TeS = 5.5°C
TcS = 48°C
L
(Factory setting)
2.5
L
(Factory setting)
43
EV mode Initial opening Max. opening
1 Y1E
Y2E
2 Y1E
Y2E
3 Y1E
Y2E
4 Y1E
Y2E
5 Y1E
Y2E
M H
5.5 8.5
M H
46 49
2000 2000
2000 2000
2000 2000
0 0
750 1400
250 400
0 0
700 1000
700 2000
500 2000
Min. opening Normal opening
2000 Fixed at 2000
2000 Fixed at 2000
1400 Heat exchanger PI control
0 Fixed at 0
100 Heat exchanger PI control
100 Motorized valve PI control
0 Fixed at 0
100 Motorized valve PI control
100 Motorized valve PI control
100 Motorized valve PI control
Function
25