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1. Compressor Control
1-1. Compressor capacity control
(1) Outdoor unit operation control
¶ The compressor capacity is calculated by the C.C.U. based on the operation capacities of the indoor units and
the difference between the temperature setting and room temperature. This is designated as the C.C.U. target
capacity, and this is assigned to each outdoor unit as the outdoor unit target capacity.
¶ Priority is given to the PC unit for operation.
¶ To allow operation of the maximum number of outdoor units, the outdoor units may be re-selected in cases
where the required operation capacity is 80% or more of the PC unit maximum operation capacity.
¶ In order to compensate for the capacity, compressors may operate at more than the indoor unit operation
capacity in some cases.
(2) Relationship between current operation capacity and output
(Current operation capacity: Indicated as percentage with the maximum capacity being 100%)
1 150 type
Table 1
Output
PC compressor Low-pressure valve
AC compressor Magnet switch
External save valve
The scroll (SC) compressor magnet switch is turned on at 52% or more.
2 190 type
Table 2
Output
PC compressor Low-pressure valve
AC compressor Magnet switch
External save valve
The compressor magnet switch is turned on at 11.5 H.P. or more.
(3) Startup delay for outdoor unit
When an operation start signal is received, the operation of each outdoor unit compressor is delayed by "outdoor
address".
(4) Startup delay for AC and SC compressors in PC unit
If the outdoor unit target capacity is determined in the full stop state indicates that more than one compressor will
be started at the same time, the SC compressor starts 15 seconds delayed from the AC compressor, and the AC
compressor starts 15 seconds delayed from the PC compressor. However, the delay time is five seconds when
using 4-way valve adjustment control, inter-system oil recovery control, and hot gas defrosting control.
(5) All outdoor unit compressors that have been stopped do not operate for three minutes.
* When the capacity is decreased from maximum capacity operation, the AC compressor is stopped, and then the
SC compressor is stopped and the AC compressor is turned on again, operation is performed by the PC com-
pressor only for the three minutes that the AC compressor is off.
(6) In the PC unit, if a compressor is started when another compressor is already operating, the
high-pressure valve (HPV): OFF, low-pressure valve (LPV): ON, and save valve (SAVE): ON
6
status is held for 15 seconds before starting the compressor.
(7) Increasing and reducing the operation capacity
When the outdoor target capacity is decreased, this immediately becomes the target capacity.
If the outdoor target capacity is increased, the target capacity either increases immediately to this capacity or it
increases in 30-second steps depending on the increase amount.
Current operation capacity (%)
Magnet switch
High-pressure valve
Current operation capacity (%)
Magnet switch
High-pressure valve
VI - 2
7
14
21
28
0
52
59
66
73
OFF
ON
ON
ON
ON
ON
ON
ON
OFF OFF
OFF OFF OFF
ON
ON
OFF OFF OFF OFF OFF
ON
ON
OFF
ON
OFF
0
60
68
74
82
OFF
ON
ON
ON
ON
ON
ON
OFF OFF
ON
OFF OFF
ON
ON
OFF
OFF OFF OFF OFF
ON
ON
OFF
ON
OFF
ON
Processes and Functions
36
42
49
56
87
89
94
100
ON
ON
ON
ON
ON
ON
OFF OFF
OFF OFF
ON
ON
ON
ON
ON
ON
ON
OFF
ON
OFF
88
96
100
ON
ON
ON
ON
OFF OFF
OFF
ON
ON
ON
ON
ON
OFF
ON
OFF
TD831077
- Quick Links:
- Technical Data
- Service Manual
- Outdoor Unit
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