Mitsubishi Electric Mr. Slim PLA-A12BA, Service Manual

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31 31
11
SPECIAL FUNCTION
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 occurred on main unit
Start operation
Run
Abnormal condition
Stop
Run
Main
unit
IC-1
Sub
unit
IC-2
Error occurred 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 Main Sub Main Sub
OC: Outdoor unit
IC: Indoor unit
RC: Wired remote controller
[2nd stage cut-in function]··· Request code number "322~324"
Start operation Sub unit start operation
Room temp. Set point
Sub unit stop
Room temp. < Set point -4
Û&
(7.5
Û)
)
Run
Stop Stop Run
Main
unit
,&
Sub
unit
,&
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
· Operating the unit of main and sub alternately according to the interval setting. (Rotation function)
+ The setting of main/sub unit depends on the refrigerant address.(The setting of dip switch on the outdoor unit)
Refrigerant address"00" Main unit
Refrigerant address"01" Sub unit
· If an error occurrs to one unit, the other unit starts.(Back-up function)
System constraint
· This function is available only by the grouping control system(INDOOR UNIT : OUTDOOR UNIT=1:1) of 2 refrigerant
group.(Refer to Fig 1)
· It is necessary to connect remote controller crossover wiring to between units(Wireless remote controller is unusable) and
to assign refrigerant address to each unit.(Dip switch on the outdoor unit…Refrigerant address 00/01)
(2) 2nd stage cut-in function
Outline of functions
· Quantity of operating units is controlled according to the room temperature and set point.
· When room temperature becomes more than set point, standby unit starts.(2 units running )
· When room temperature falls below set point -4
(7.5°F), standby unit stops.(1 unit running)
System constraint
· This function is available only in rotation operation(or back-up) and cooling mode.