Outline Of Control - Daikin VRV K Manual

SI-95.BOOK Page 15 Friday, March 31, 2000 10:59 AM
Si-95
1.4

Outline of Control

1.4.1 Inverter Compressor, Motorized PI Control
1. Compressor PI control
I Cooling operation
I Heating operation
I 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
Functions Inverter K Series
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 M
(Factory setting)
2.5 5.5
L M
(Factory setting)
43 46
EV mode Initial opening Max. opening
1 Y1E 2000
Y2E 2000
2 Y1E 2000
Y2E 0
3 Y1E 750
Y2E 250
4 Y1E 0
Y2E 700
5 Y1E 700
Y2E 500
H
8.5
H
49
Min. opening Normal opening
2000 2000 Fixed at 2000
2000 2000 Fixed at 2000
2000 1400 Heat exchanger PI control
0 0 Fixed at 0
1400 100 Heat exchanger PI control
400 100 Motorized valve PI control
0 0 Fixed at 0
1000 100 Motorized valve PI control
2000 100 Motorized valve PI control
2000 100 Motorized valve PI control
Functions
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