Special Function - Mitsubishi Electric Mr.SLIM PKA-A12GA 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
· Operating the unit of main and sub alternately according to the interval setting. (Rotation function)
wThe setting of main/sub unit depends on the refrigerant address.(The setting of dip switch on the outdoor unit)
Refrigerant address"00"
Refrigerant address"01"
· 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)
Operation pattern
[Back-up function only]··· Request code number "312"
Start operation
Main
unit
Run
IC-1
Sub
unit
Stop
IC-2
[Rotation function] & [Back-up function]··· Request code number "313~318"
Start operation
Main
unit
Run
IC-1
Sub
unit
Stop
IC-2
1~28 days
(Ex:When the request code number is "313", each unit operates alternately in daily cycle.)
(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.
[2nd stage cut-in function]··· Request code number "322~324"
Start operation
Main
unit
Run
IC-1
Sub
unit
Stop
IC-2
Main unit
Sub unit
Error occurred on main unit
Main Sub
Abnormal condition
Run
Error occurred on main unit
Main Sub Main Sub Main
Stop Run
Run Stop
1~28 days
Room temp. Set point Room temp. < Set point -4 (7.5°F)
Sub unit start operation Sub unit stop
Run
Fig 1
Main
unit
OC: Outdoor unit
Sub
IC:
Abnormal condition
RC: Wired remote controller
Run
Stop
35
Refrigerant address Refrigerant address
"00" "01"
OC-2
OC-1
3(2)
3(2)
IC-1 IC-2
2
2
RC
Indoor unit
Sub
unit