23
23
7
SPECIAL FUNCTION
Note:
· When the unit is restarted to operate after turning off the power or OFF operation, the unit which was operating will start oper-
ation.
· To operate the main unit, refer to the 7-1-2. and set the request code No. which is not the same as the current one, and set
again the former request code No.
(2) 2nd stage cut-in function
Outline of functions
· When the 1st unit can NOT supply with sufficient capacity for exceptionally high-demand conditions and the actual room
temperature reaches set point *, the 2nd unit starts operation in conjunction with the 1st unit.
· Once the actual room temperature goes down to 4 degrees C (7.5 degrees F) below set point*, the 2nd unit stops operation
automatically.
(* set point = set temperature by R/C (remote controller) + 4, 6, 8
:
(7.5, 10.8, 14.4°F) (selectable))
· Number of operating units is determined according to the room temperature and set point.
· When room temperature becomes higher than set point, standby unit starts. (2 units operation)
· When room temperature falls below set point -4
:
(-7.5°F), standby unit stops. (1 unit operation)
7-1. Rotation Function (and back-up function, 2nd stage cut-in function)
This function is only available when using wired remote controller.
7-1-1. Operation
(1) Rotation function (and Back-up function)
Outline of functions
· Main and sub units operate alternately according to the interval of rotation setting.
w
Main and sub unit should be set by refrigerant address. (Outdoor Dip switch setting)
Refrigerant address "00"
Main unit
Refrigerant address "01"
Sub unit
· When 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 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)
Operation pattern
OC-1
OC-2
IC-1
IC-2
3(2)
3(2)
2
RC
2
Main
unit
Sub
unit
Refrigerant address
"01"
Refrigerant address
"00"
Fig. 1
[Back-up function only]··· Request code number "312"
[Rotation function] & [Back-up function]··· Request code number "313~318"
(Ex:When the request code number is "313", each unit operates alternately in daily cycle.)
Error occurs on main unit.
Start operation
Run
Abnormal condition
Stop
Run
Main
unit
IC-1
Sub
unit
IC-2
Error occurs on main unit.
Start operation
1~28 days
1~28 days
Run
Abnormal condition
Stop
Stop
Run
Run
Stop
Run
Main
unit
IC-1
Sub
unit
IC-2
Main Sub
Main Sub
Sub Main
Main Sub
OC : Outdoor unit
IC : Indoor unit
RC : Wired remote controller
