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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 temperature +10°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 ONONONONON
6ONONONOFFON
7 ONONONONOFF
8ONONONOFFOFF
Cooling-only
Cooling-main
9ONOFFOFFONON
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 ONONONONON
6ONONONOFFON
7 ONONONONOFF
8ONONONOFFOFF
9ONOFFOFFONON
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