Mitsubishi Electric PLA-RP50 Service Manual download pdf (Page 38)

Operation pattern

OC-1

OC-2

IC-1

IC-2

3(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

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

Note:

· When the unit is restarted to operate after turning off the power or OFF operation, the unit which was operationg will start

operation.

· To operate the main unit, refer to the 11-5-2. 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 4degrees C below set point *, the 2nd unit stops operation automatically.

(* set point = set temperature by R/C (remote controller) + 4, 6, 8: (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:, standby unit stops.(1 unit operation)

11-5. ROTATION FUNCTION (AND BACK-UP FUNCTION, 2ND STAGE CUT-IN FUNCTION)

11-5-1. Operation

(1) Rotation function (and Back-up function)

• Outline of functions

· Main and sub unit operate alternately according to the interval of rotation setting.

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)

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Mitsubishi Electric PLA-RP50 Service Manual Page 38

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