Mitsubishi Electric Mr.SLIM PLP-6EAER1 Service Manual page 36

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
Run
unit
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 "13-6. 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)
• System constraint
· This function is available only in cool mode.
E.g.) Set temp. by R/C = 20˚C
Set point = 26˚C
26˚C 2nd unit Cut-in
4˚C
22˚C 2nd unit Cut-out
20˚C
OCH783B
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
[2nd stage cut-in function]
Main
unit
IC-1
Sub
unit
IC-2
Sub
unit
IC-3
Fig. 1
Refrigerant address
"00"
OC-1
Main
3(2)
unit
IC-1
2
RC
OC: Outdoor unit
IC: Indoor unit
RC: Wired remote controller
Room temp. ] Set point
Start operation Sub unit start operation
Run
Run
Stop Run
36
Refrigerant address Refrigerant address
"01" "02"
OC-2 OC-3
Sub
3(2)
unit
IC-2 IC-3
2 2
Room temp. < Set point −4°C
Sub unit stop
Stop
Sub
3(2)
unit