II - 2
Processes and Functions
SM830063
2
1. Compressor Control
1-1. Compressor capacity control
(1) Compressor usage by model
Outdoor unit capacity 28 kw outdoor unit 22.4 kw outdoor unit
Type of compressor P/C compressor AC compressor P/C compressor AC compressor
Compressor capacity 14 kw 14 kw 11.2 kw 11.2 kw
P/C compressor : Power control compressor
AC compressor : Constant speed compressor
(2) Compressor capacity control
The compressor capacity control is achieved by switching on and off the P/C compressor, AC compressor, low-
pressure valve (No. 1, 2, 3) high-pressure valve, and external save valve following the current capacity obtained
through the calculation procedure below.
¶ Serial capacity calculation (calculated from indoor unit capacity with thermo-on
and the difference between temperature setting and room temperature)
↓
¶ Aid-capacity calculation (Calculation from operating condition)
↓
¶ Upper limit capacity (= serial capacity + aid-capacity)
↓
¶ Calculation of current capacity (protective control, etc., added)
↓
¶ The compressor magnetic contactor (52 C), low-pressure valve (No. 1, 2, 3) , high-pressure valve, and save
valve output are set according to the current capacity.
Occasionally, some special-purpose control is added.
(3) Relationship between current capacity and outputs
1 50 Hz 22.4 kw outdoor unit (SPW-CR703GVH8, SPW-CR703GV8)
Current capacity (kw) 0 1.4 2.8 4.2 5.6 7 8.4 9.8 11.2
52C OFF ON ON ON ON ON ON ON ON
High-pressure valve OFF OFF OFF ON ON ON ON ON ON
Low-pressure valve 1 ON ON ON OFF OFF ON ON ON ON
Low-pressure valve 2 ON ON ON ON ON OFF OFF ON ON
Low-pressure valve 3 ON ON ON ON ON ON ON OFF OFF
11.2 kw compressor (AC) OFF OFF OFF OFF OFF OFF OFF OFF OFF
External save valve ON ON OFF ON OFF ON OFF ON OFF
Current capacity (kw) 12.6 14 15.4 16.8 18.2 19.6 21 22.4
52C ON ON ON ON ON ON ON ON
High-pressure valve OFF OFF ON ON ON ON ON ON
Low-pressure valve 1 ON ON OFF OFF ON ON ON ON
Low-pressure valve 2 ON ON ON ON OFF OFF ON ON
Low-pressure valve 3 ON ON ON ON ON ON OFF OFF
11.2 kw compressor (AC) ON ON ON ON ON ON ON ON
External save valve ON OFF ON OFF ON OFF ON OFF
2 50 Hz 28 kw outdoor unit (SPW-CR903GVH8, SPW-CR903GV8)
Current capacity (kw) 0 1.75 3.5 5.25 7 8.75 10.5 12.25 14
52C OFF ON ON ON ON ON ON ON ON
High-pressure valve OFF OFF OFF ON ON ON ON ON ON
Low-pressure valve 1 ON ON ON OFF OFF ON ON ON ON
Low-pressure valve 2 ON ON ON ON ON OFF OFF ON ON
Low-pressure valve 3 ON ON ON ON ON ON ON OFF OFF
14 kw compressor (AC) OFF OFF OFF OFF OFF OFF OFF OFF OFF
External save valve ON ON OFF ON OFF ON OFF ON OFF
Current capacity (kw) 15.75 17.5 19.25 21 22.75 24.5 26.25 28
52C ON ON ON ON ON ON ON ON
High-pressure valve OFF OFF ON ON ON ON ON ON
Low-pressure valve 1 ON ON OFF OFF ON ON ON ON
Low-pressure valve 2 ON ON ON ON OFF OFF ON ON
Low-pressure valve 3 ON ON ON ON ON ON OFF OFF
14 kw compressor (AC) ON ON ON ON ON ON ON ON
External save valve ON OFF ON OFF ON OFF ON OFF
11.2 kw
compressor
(P/C)
11.2 kw
compressor
(P/C)
14 kw
compressor
(P/C)
14 kw
compressor
(P/C)
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