Mitsumi electronic PKA-A12HA4, PKA-A18HA4 Special Function, Operation, System constraint

10 SPECIAL FUNCTION

10-1. Rotation Function (and back-up function, 2nd stage cut-in function)

This function is only available when using wired remote controller.

10-1-1. Operation

(1)Rotation function (and Back-up function) Outline of functions

·Main and sub units 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 IR wireless remote controller.)

·Set refrigerant address of each unit. (Dip switch on the outdoor unit ··· Refrigerant address 00/01)

Operation pattern

[Back-up function only]··· Request code number "312"

	Start operation		Error occurs on main unit.
			Main Sub
Main
unit				Abnormal condition
		Run
IC-1
Sub
unit		Stop		Run
IC-2

[Rotation function] & [Back-up function]··· Request code number "313~318"

Error occurs on main unit.

Fig. 1 Refrigerant address

	"00"
		OC-1
Main
	3(2)
unit
		IC-1
	2		2
		RC

Refrigerant address "01"

OC-2

Sub

3(2) unit

IC-2

Start operation Main Sub Sub Main Main Sub

OC : Outdoor unit

Main

unit

IC-1

Sub unit IC-2

Run

Stop

1~28 days

Stop

Run

1~28 days

Run

Stop

Abnormal condition

Run

IC : Indoor unit

RC : Wired remote controller

(Ex:When the request code number is "313", each unit operates alternately in daily cycle.)

Note:

·When the uint is restarted to operate after turning off the power or OFF operation, the unit which was operating will start oper- ation.

·To operate the main unit, refer to the 10-1-2. 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 4 degrees C (7.5 degrees F) below set point*, the 2nd unit stops operation automatically.

(* set point = set temperature by R/C (remote controller) + 4, 6, 8:(7.5, 10.8, 14.4°F) (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:(-7.5°F), standby unit stops. (1 unit operation)

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