2WAY SYSTEM
Control Functions - Outdoor unit
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1. Introduction
1. Introduction
●
The ME2 series outdoor units are systems that allows multiple outdoor units to be connected.
●
All the outdoor units do not utilize the sub units that were used in earlier systems.
The O/U.ADD of outdoor unit PCB where the unit is set to “1” becomes the main unit and activates as the CCU
(command controller unit) functions that controls the entire system.
PCB Setting of Outdoor Unit
In order to determine the outdoor unit to be the main or sub unit, it is necessary to make settings at each PCB.
●
Main outdoor unit
The outdoor unit where the O/U.ADD is set to “1” activates the CCU (command controller unit) functions that
controls the entire system. This outdoor unit is the main outdoor unit.
* For the main outdoor unit, perform all the settings in the table (PCB setting of outdoor unit) below.
●
Sub outdoor unit
The outdoor unit where the unit No. is set to other than “1” is a sub outdoor unit.
* The system will not operate if outdoor units have been set other than unit No. “1”.
PCB Setting of Outdoor Unit
at factory
shipment
Main outdoor unit
On-site setting
Sub outdoor unit
On-site setting
O/U.ADD [SW5]
Outdoor units address
1
1
2 ~ 4
R.C.ADD [SW1, SW2]
System address
1
System 1 ~ 30
Not necessary
NO.OF I/U [SW3, SW4]
No. of indoor units
1
System 1 ~ 64 units
Not necessary
NO.OF O/U [SW6]
No. of outdoor units
1
System 1 ~ 4 units
Not necessary
* This system can be extended to connect a maximum of 4 outdoor units.
2. Selecting Outdoor Unit for Operation
Outdoor Unit Operating Rules
(1) Outdoor Unit Operating Rules
As a result of setting the main outdoor and sub outdoor units due to the O/U.ADD setting, the order of priority for
the outdoor units is determined in small values of O/U.ADD sequence. Because in this system all outdoor units
contain an inverter compressor, ordinarily there is no absolute order of priority for compressor operation.
(2) Delayed Start of Outdoor Units
1. Delayed start of outdoor unit in the same system
If it is necessary to operate the compressors simultaneously at multiple outdoor units, each outdoor unit will
start in order of unit No. every one second, beginning with unit No. 1.
*
Operation
starts
This is in order to reduce the load on the power supply equipment.
2. Delayed start for each system
When systems are linked with one communication cable and multiple systems are required to operate
simultaneously by the central control device, all main outdoor units will begin operating simultaneously.
In this situation, the load of the power supply equipment increases temporarily.
To prevent the overload, the start timing of each system can be delayed.
In order to enable this delay time, it must be set in the EEPROM for each system (Main outdoor unit).
Those systems (Main outdoor units) where this setting has been made will start after a delay according to
their system addresses.
To activate this delay start function, it is necessary to set it to EEPROM on main outdoor PCB.
EEPROM setting in main outdoor unit
CODE: 3E
2WAY VRF SYSTEM
Control Functions
Main outdoor unit
O/U.ADD = 1
Starts after 1 second
Sub outdoor unit
O/U.ADD = 2
Starts after 2 seconds
Sub outdoor unit
O/U.ADD = 3
Starts after 3 seconds
Sub outdoor unit
O/U.ADD = 4
Starts after 4 seconds
Delay time
Setting No.
0
(at factory shipment)
No delay start for each system
1
(System address × 1 × 8) seconds delay
2
(System address × 2 × 8) seconds delay
3
(System address × 3 × 8) seconds delay
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16/08/26 19:23:13
