Processes and Functions
6
TD831077
VI - 2
1. Compressor Control
Table 1
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
Current operation capacity (%)
0
7 14212836424956
Output 52 59 66 73 87 89 94 100
Magnet switch OFF ON ON ON ON ON ON ON ON
PC compressor Low-pressure valve ON ON ON OFF OFF ON ON OFF OFF
High-pressure valve OFF OFF OFF ON ON OFF OFF ON ON
AC compressor Magnet switch OFF OFF OFF OFF OFF ON ON ON ON
External save valve ON ON OFF ON OFF ON OFF ON OFF
The scroll (SC) compressor magnet switch is turned on at 52% or more.
2 190 type
Current operation capacity (%)
Output
0 60687482 8896100
Magnet switch OFF ON ON ON ON ON ON ON
PC compressor Low-pressure valve ON ON OFF OFF ON ON OFF OFF
High-pressure valve OFF OFF ON ON OFF OFF ON ON
AC compressor Magnet switch OFF OFF OFF OFF ON ON ON ON
External save valve ON OFF ON OFF ON OFF ON OFF
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
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.
Table 2
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