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[5-2 Outdoor Unit Control ]
5-2
Outdoor Unit Control
5-2-1
Overview
The outdoor units are designated as OC, OS1 and OS2 in the order of capacity from large to small (if two or more units have
the same capacity, in the order of address from small to large).
The setting of outdoor unit can be verified by using the self-diagnosis switch (SW4).
SW4 (SW6-10:OFF)
ON
1
2
3
4
5
6
7
ON
1
2
3
4
5
6
7
8
9 10
The OC determines the operation mode and the control mode, and it also communicates with the indoor units.
The OS exercises autonomous distributed control (over defrost, error detection, and actuator control etc.) according to the
operation/control mode signals that are sent from the OC.
5-2-2
Rotation Control
At the initial startup, outdoor units start up in the order of "OC, OS1 and OS2." After two or more hours of operation, the startup
sequence changes to "OS1, OS2 and OC" or "OS2, OC and OS1".
Startup sequence rotation is performed while all the indoor units are stopped. (Even after two hours of operation, startup se-
quence rotation is not performed while the compressor is in operation.)
For information about rotation control at initial startup, refer to the following page(s). [5-2-15 Control at Initial Startup]
Performing startup sequence rotation does not change the basic operation of OC and OS. Only startup sequence is changed.
Startup sequence of the outdoor units can be checked with the self-diagnosis switch (SW4) on the OC.
SW4 (SW6-10:OFF)
ON
1
2
3
4
5
6
7
8
ON
1
2
3
4
5
6
7
8
9 10
5-2-3
Initial Control
When the power is turned on, the initial processing of the microcomputer is given top priority.
During the initial processing, control processing of the operation signal is suspended. (The control processing is resumed after
the initial processing is completed. Initial processing involves data processing in the microcomputer and initial setting of each
of the LEV opening. This process will take up to 5 minutes.)
During the initial processing, the LED monitor on the outdoor unit's control board displays S/W version
Model and capacity
and communication address in turn every second.
5-2-4
Startup Control
The upper limit of frequency during the first 3 minutes of the operation is 50 Hz.
When the power is turned on, normal operation will start after the initial start-up mode (to be described later) has been com-
pleted (with a restriction on the frequency).
HWE18240_GB
The unit is designated as the OC: "OC" appears on the display.
The unit is designated as OS1: "OS-1" appears on the display
The unit is designated as OS2: "OS-2" appears on the display.
8
9 10
The figure at left shows that the switches 1 through 5 are set to ON and 6 through 10 are set to OFF.
OC OS1 OS2: "OC" and the OC address appear alternately on the display.
OS1 OS2 OC: "OS-1" and the OS1 address appear alternately on the display.
OS2 OC OS1: "OS-2" and the OS2 address appear alternately on the display.
9 10
The figure at left shows that the switches 1 through 5 are set to ON and 6 through 10 are set to OFF.
Display
Display
refrigerant type
9
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