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10
SPECIAL FUNCTION
10-1. ROTATION FUNCTION (AND BACK-UP FUNCTION, 2ND STAGE CUT-IN FUNCTION)
Note that this function is not available for SUZ, MXZ, and PUMY models.
10-1-1. Operation
(1) Rotation function (and Back-up function)
• Outline of functions
· Main and sub unit operate according to the interval of rotation setting.
Main and sub unit should be set by refrigerant address. (Outdoor DIP switch setting)
Refrigerant address "00"
Refrigerant address "01", "02"
· When an error occurs to one unit, another unit will start operation. (Back-up function)
• System constraint
· This function is available only by the grouping control system (INDOOR UNIT: OUTDOOR UNIT=1:1) of 2 or 3 refrigerant
groups. (Refer to Fig. 1)
· Main indoor unit should be connected for wired remote controller and the transmission line (TB5) for main and sub unit
should also be connected. (Refer to Fig. 1)
(This function cannot be set by wireless remote controller.)
· Set refrigerant address of each unit. (DIP switch on the outdoor unit ··· Refrigerant address 00/01/02)
Operation pattern
1 [Back-up function only]
Start operation
Main
unit
Run
IC-1
Sub
unit
Stop
IC-2
2 [Rotation function] & [Back-up function]
Start operation
Main
Main
unit
Run
IC-1
Sub
unit
Run
IC-2
Sub
unit
Stop
IC-3
1 – 28 days
(E.g. : When the rotation setting is "1 day", each unit operates alternately in daily cycle.)
Note:
· When the unit is restarted to operate after turning off the power or operation OFF status, the unit which was operating will
start operation.
· To operate the main unit, refer to "12-6. ROTATION SETTING" and set again.
(2) 2nd stage cut-in function
• Outline of functions
· When the 1st and 2nd unit CANNOT supply sufficient capacity for exceptionally high-demand conditions and the actual
room temperature reaches set point (*), the 3rd unit starts operation in conjunction with the 1st and 2nd unit.
· Once the actual room temperature goes down to 4˚C below set point(*), the 3rd unit stops operation automatically.
(* set point = set temperature by R/C (remote controller) + 4, 6, 8˚C (selectable) )
· Number of operating units is determined according to the room temperature and set point.
· When room temperature reaches higher than set point, standby unit starts. (3 units operation)
· When room temperature falls below set point −4˚C, standby unit stops. (2 units operation)
OCH753A
Main unit
Sub unit
Error occurs on main unit.
Main
Sub
Abnormal condition
Run
Error occurs on main unit.
Sub
Main
Sub
Main
Sub
Run
Run
Stop
Abnormal condition
Stop
Run
Run
Run
Run
1 – 28 days
1 – 28 days
Fig. 1
Refrigerant address
"00"
OC-1
Main
3(2)
unit
IC-1
2
2
RC
OC: Outdoor unit
IC: Indoor unit
RC: Wired remote controller
22
Refrigerant address
Refrigerant address
"01"
"02"
OC-2
OC-3
Sub
3(2)
3(2)
unit
IC-2
IC-3
2
Sub
unit
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