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 ca 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)
