[
VII
Control ]
- 148 -
HWE09080
GB
-10- Capacity Control of Heat Exchanger<PQRY>
(1) Control method
Depending on the capacity required, the rotation speed of the heat source unit fan is controlled by the inverter to keep a con-
stant condensing temperature of (water tempe10°C [50°F]) during cooling operation and a constant evaporation tem-
perature of (0°C [32°F] =0.71 <Pa [103psi]) during heating operation.
The OS in the multiple-heat source-unit system operates at the actual heat source unit fan control value that is calculated by
the OS based on the preliminary heat source unit fan control value that the OC determines.
(2) Heat source unit heat exchanger capacity control patterns
Model
Operation
mode
Operation
pattern
Solenoid valve
SV4a
SV4b
SV4d
SV7a
SV7b
P72 - P120 models
Cooling-main
1
ON
OFF
ON
ON
ON
2
ON
OFF
ON
OFF
ON
3
ON
OFF
ON
ON
OFF
4
ON
OFF
ON
OFF
OFF
5
ON
ON
ON
ON
ON
6
ON
ON
ON
OFF
ON
7
ON
ON
ON
ON
OFF
8
ON
ON
ON
OFF
OFF
Cooling-only
Cooling-main
9
ON
OFF
OFF
ON
ON
10
ON
OFF
OFF
OFF
ON
11
ON
OFF
OFF
ON
OFF
12
ON
OFF
OFF
OFF
OFF
13
ON
ON
OFF
ON
ON
14
ON
ON
OFF
OFF
ON
15
ON
ON
OFF
ON
OFF
16
ON
ON
OFF
OFF
OFF
Heating-only
Heating-main
1
ON
OFF
ON
ON
ON
2
ON
OFF
ON
OFF
ON
3
ON
OFF
ON
ON
OFF
4
ON
OFF
ON
OFF
OFF
5
ON
ON
ON
ON
ON
6
ON
ON
ON
OFF
ON
7
ON
ON
ON
ON
OFF
8
ON
ON
ON
OFF
OFF
9
ON
OFF
OFF
ON
ON
10
ON
OFF
OFF
OFF
ON
11
ON
OFF
OFF
ON
OFF
12
ON
ON
OFF
ON
ON
13
ON
ON
OFF
OFF
ON
14
ON
ON
OFF
ON
OFF
15
ON
ON
OFF
OFF
OFF
Summary of Contents for PQHY-P120THMU-A
Page 1: ......
Page 11: ... 2 ...
Page 25: ... 16 ...
Page 83: ... 74 ...
Page 103: ... 94 III Heat source Unit Components GB HWE09080 ...
Page 105: ... 96 ...
Page 113: ... 104 IV Remote Controller GB HWE09080 ...
Page 115: ... 106 ...
Page 131: ... 122 ...
Page 143: ... 134 VI Refrigerant Circuit GB HWE09080 ...
Page 145: ... 136 ...
Page 181: ... 172 VII Control GB HWE09080 ...
Page 183: ... 174 ...
Page 235: ... 226 ...
Page 367: ... 358 ...
Page 414: ......
