II - 2
Processes and Functions
SM830052
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
14 kw outdoor unit
Type of compressor
P/C compressor
AC compressor
P/C compressor
AC compressor
P/C compressor
Compressor capacity
14 kw
14 kw
11.2 kw
11.2 kw
14 kw
(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
and the difference between temperature setting and room temperature)
↓
¶
Aid-capacity calculation (Calculation from operating condition)
↓
¶
Upper limit capacity (= serial ca 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)
Current capacity (kw)
0
3.5
7
10.5
14
52C
OFF
ON
ON
ON
ON
Low-pressure valve
ON
ON
ON
OFF
OFF
High-pressure valve OFF
OFF
OFF
ON
ON
Save valve
ON
ON
OFF
ON
OFF
2
50-Hz 22.4 kw outdoor unit (SPW-C703GYH8, SPW-C703GY8)
Current capacity (kw)
0
2.8
5.6
8.4
11.2
14
16.8
19.6
22.4
52C
OFF
ON
ON
ON
ON
ON
ON
ON
ON
Low-pressure valve
ON
ON
ON
OFF
OFF
ON
ON
OFF
OFF
High-pressure valve OFF
OFF
OFF
ON
ON
OFF
OFF
ON
ON
11.2 kw compressor (AC)
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
Save valve
ON
ON
OFF
ON
OFF
ON
OFF
ON
OFF
3
50-Hz 28 kw outdoor unit (SPW-C903GYH8, SPW-C903GY8)
Current capacity (kw)
0
3.5
7
10.5
14
17.5
21
24.5
28
52C
OFF
ON
ON
ON
ON
ON
ON
ON
ON
Low-pressure valve
ON
ON
ON
OFF
OFF
ON
ON
OFF
OFF
High-pressure valve OFF
OFF
OFF
ON
ON
OFF
OFF
ON
ON
14 kw compressor (AC)
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
Save valve
ON
ON
OFF
ON
OFF
ON
OFF
ON
OFF
(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.
14 kw
compressor
(P/C)
11.2 kw
compressor
(P/C)
14 kw
compressor
(P/C)
