Daikin R407C PLUS, Service Manual

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Outline of Control (Outdoor Unit) < Symbols using in this manual > Si33-105
68 Function R407C PLUS Series Heat Recovery System
3.4.2 Motorized Valve PI Control (Heating)
Controls the motorized valves (EV1, EV2, EV3) to maintain the outlet superheated degree (SH)
of the outdoor heat exchanger (evaporator) at constant during heating operation.
SH = Th7 – Te
Te: Low pressure equivalent saturation temperature (°C)
Th7: Accumulator outlet temperature (°C)
Superheated degree target value (SHS)
!
Initial value at the start of motorized valve control: SHS = 5 °C
!
When Th7 – Te < 5: SHS (new) = SHS (current) + 1
However, when Th7 – Te < 5 and DSHi < 30: SHS = 7 °C (fixed)
!
When Th7 – Te > 10: SHS (new) = SHS (current) – 1
DSHi: Inverter discharge pipe superheat
3.4.3 Heat Exchanger PI Control (Heating & Simultaneous Cooling/Heating
Operation Mode)
In heating and simultaneous cooling/heating operation, conducts heat exchanger PI control,
switches the operation mode through 3 of 4-way valves, and adjusts the capacity by controlling
3 off electronic expansion valves, outdoor fan, auxiliary heat exchanger, and pressurizing valve.
16 to 20 HP
Note: GR/SH control: Imaginary refrigerant circulation amount/Super heat degree control
step
No.
Heat exchanger 1 Heat exchanger 2 Pressurizing
valve
Y5S
20S1 Heat
exchanger
mode
20E1 Aux.
condensor
Fan
(MF11+MF12)
20S2 Heat
exchanger
mode
20E2 Fan
(MF3+MF4)
b OFF cond 0pls OFF H+OFF OFF cond 2000pls ON+ON OFF
a OFF cond 0pls OFF L+OFF OFF cond 2000pls ON+ON OFF
0 ON evp 0pls ON H+ON OFF cond 2000pls ON+ON OFF
1 ON evp 0pls OFF H+ON OFF cond 2000pls ON+ON OFF
2 ON evp 0pls OFF H+ON OFF cond 1000pls ON+ON OFF
3 ON evp 0pls OFF H+ON OFF cond 700pls ON+ON ON
4 ON evp 0pls OFF H+ON OFF cond 500pls(PI) ON+ON ON
5 ON evp 0pls ON H+ON OFF cond 2000pls ON+OFF OFF
6 ON evp 0pls ON H+ON OFF cond 1000pls ON+OFF OFF
7 ON evp 0pls ON H+ON OFF cond 700pls ON+OFF ON
8 ON evp 0pls ON H+ON OFF cond 500pls(PI) ON+OFF ON
9 ON evp 0pls OFF H+ON OFF cond 2000pls ON+OFF OFF
10 ON evp 0pls OFF H+ON OFF cond 1000pls ON+OFF OFF
11 ON evp 0pls OFF H+ON OFF cond 700pls ON+OFF ON
12 ON evp 0pls OFF H+ON OFF cond 500pls(PI) ON+OFF ON
13 ON evp
GR/SH
control
OFF H+ON OFF cond 2000pls ON+OFF OFF
14 ON evp
GR/SH
control
OFF H+ON OFF cond 1000pls ON+OFF OFF
15 ON evp
GR/SH
control
OFF H+ON OFF cond 700pls ON+OFF ON
16 ON evp
GR/SH
control
OFF H+ON OFF cond
500pls(PI)
ON+OFF ON
23 ON evp
GR/SH
control
OFF H+ON OFF cond 1000pls OFF+OFF OFF
24 ON evp
GR/SH
control
OFF H+ON ON evp 0pls ON+ON OFF
25 ON evp
GR/SH
control
OFF H+ON ON evp
SH
control
ON+ON OFF
500pls(PI)
: Pc control