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1. Compressor Control
1-1. Compressor capacity control
(1) Compressor usage by model
Outdoor unit capacity
Type of compressor
Compressor capacity
(2) Compressor capacity control
The compressor capacity control is achieved by switching on and off the P/C compressor, AC compressor, low-
pressure valve, 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
¶ Aid-capacity calculation (Calculation from operating condition)
2
¶ Upper limit capacity (= serial capacity + aid-capacity)
¶ Calculation of current capacity (protective control, etc., added)
¶ The compressor electromagnetic contactor (52 C), low-pressure valve, 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 14 kw outdoor unit (SPW-C483GYH8, SPW-C483GY8)
14 kw
compressor
(P/C)
Save valve
2
50-Hz 22.4 kw outdoor unit (SPW-C703GYH8, SPW-C703GY8)
11.2 kw
compressor
(P/C)
11.2 kw compressor (AC)
Save valve
3
50-Hz 28 kw outdoor unit (SPW-C903GYH8, SPW-C903GY8)
14 kw
compressor
(P/C)
14 kw compressor (AC)
Save valve
(4) AC compressor start delay (for outdoor units)
When two compressors are to be started, the AC compressor is started 15 seconds after the P/C compressor.
(22.4 kw, 28 kw outdoor units)
(5) For compressors, when a compressor is stopped, it is not restarted for 3 minutes. During this period, the current
capacity does not increase. However, stops before and after reverse-cycle starting and reverse-cycle defrosting
are excluded from this rule.
28 kw outdoor unit
P/C compressor
14 kw
and the difference between temperature setting and room temperature)
↓
↓
↓
↓
Current capacity (kw)
52C
OFF
Low-pressure valve
High-pressure valve OFF
Current capacity (kw)
52C
OFF
Low-pressure valve
High-pressure valve OFF
OFF
Current capacity (kw)
52C
OFF
Low-pressure valve
High-pressure valve OFF
OFF
22.4 kw outdoor unit
AC compressor
P/C compressor
14 kw
11.2 kw
0
3.5
7
10.5
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
OFF
ON
OFF
0
2.8
5.6
8.4
11.2
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
ON
ON
OFF
ON
OFF
0
3.5
7
10.5
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
ON
ON
OFF
ON
OFF
II - 2
Processes and Functions
AC compressor P/C compressor
11.2 kw
14
ON
ON
14
16.8
19.6
22.4
ON
ON
ON
ON
ON
ON
OFF
OFF
ON
OFF
OFF
ON
ON
ON
ON
ON
OFF
ON
OFF
14
17.5
21
24.5
ON
ON
ON
ON
ON
ON
OFF
OFF
ON
OFF
OFF
ON
ON
ON
ON
ON
OFF
ON
OFF
14 kw outdoor unit
14 kw
ON
ON
ON
28
ON
ON
ON
SM830052
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