Special Function - Mitsubishi Electric Mr. SLIM PLA Series Service Manual

11

SPECIAL FUNCTION

11-1. ROTATION FUNCTION (AND BACK-UP FUNCTION, 2ND STAGE CUT-IN FUNCTION)
11-1-1. Operation
(1) Rotation function (and Back-up function)
Outline of functions
• Main and sub unit operate alternately according to the interval of rotation setting.
Note: Main and sub unit should be set by refrigerant address. (Outdoor DIP switch setting)
Refrigerant address "00"
Refrigerant address "01"
• 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
1 [Back-up function only]··· Request code number "312"
Start operation
Main
unit
IC-1
Sub
unit
IC-2
2 [Rotation function] & [Back-up function]··· Request code number "313~318"
Start operation
Main
unit
IC-1
Sub
unit
IC-2
1~28 days
(Ex: When the request code number is "313", each unit operates alternately in daily cycle.)
Note:
• When the unit is restarted to operate after turning off the power or OFF operation, the unit which was operating will start
operation.
• To operate the main unit, refer to "11-1-2. How to set rotation function (Back-up function, 2nd stage cut-in function)" and set
the request code No. which is not the same as the current one, then set again the former request code No.
(2) 2nd stage cut-in function
Outline of functions
• When the 1st unit cannot supply sufficient capacity for exceptionally high-demand conditions and the actual room tempera-
ture reaches set point (*), the 2nd unit starts operation in conjunction with the 1st unit.
• Once the actual room temperature goes down to −7.2°F [4:] below set point (*), the 2nd unit stops operation automatically.
(* set point = set temperature by R/C (remote controller) + 7.2, 10.8, 14.4°F [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. (2 units operation)
• When room temperature falls below set point −7.2°F [−4:], standby unit stops. (1 unit operation)
TCH070A
TCH070A.indd 38 TCH070A.indd 38
Main unit
Sub unit
Error occurs on main unit.
Main Sub
Abnormal condition
Run
Stop
Run
Main Sub Main Sub
Run Stop
Stop Run
1~28 days
Error occurs on main unit.
Main Sub
Abnormal condition
Run
Stop Run
38
Fig. 1
Refrigerant address Refrigerant address
"00" "01"
OC-1 OC-2
Main
3(2)
unit
IC-1 IC-2
2
2
RC
OC : Outdoor unit
IC : Indoor unit
RC : Wired remote controller
Sub
3(2)
unit
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