2WAY VRF SYSTEM
Control Functions
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2WAY VRF SYSTEM
Control Functions
1. Introduction
1. Introduction
PCB Setting of Outdoor Unit
PCB Setting of Outdoor Unit
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.
In order to determine the outdoor unit to be the main or sub unit, it is necessary to make settings at each PCB.
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.
The ME2U series outdoor units for USA is a system that allows multiple outdoor units to be connected.
Main 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”.
* This system can be exteded to connect a maximum of 3 outdoor units.
Sub outdoor unit
Factory
preset
mode
Main outdoor unit
On-site setting
Sub outdoor unit
On-site setting
Setting other than 1
(Duplication prohibited)
O/U.ADD
[SW5]
1
1
Outdoor units address
R.C.ADD
[SW1, SW2]
1
Not necessary
System 1 ~ 30
System address
NO.OF I/U [SW3, SW4]
1
Not necessary
System 1 ~ 64 units
No. of indoor units
NO.OF O/U
1
Not necessary
System 1 ~ 3 units
No. of outdoor units
[SW6]
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
Main outdoor unit
Sub outdoor unit
Sub outdoor unit
O/U.ADD = 1
O/U.ADD = 2
O/U.ADD = 3
Starts after 1 second
Starts after 2 seconds
Starts after 3 seconds
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
Delay time
Setting No.
0
(factory preset mode)
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
1. Introduction
SM830237-07_北米向け2WAY_VRF.indb 2
18/06/19 18:55:29
