2. Selecting an Outdoor Unit for Operation
W-2WAY ECO-i SYSTEM Control Functions
2-1. Outdoor Unit Operating Rules
Because in this system all outdoor units contain an inverter compressor, ordinarily there is no absolute order of priority for compressor operation. Therefore there is no order of priority for the outdoor units.
However, it is possible to operate the outdoor units in sequence, beginning with unit No. 1, by using the outdoor unit maintenance remote controller to change the outdoor unit EEPROM settings.
* For information concerning EEPROM settings, refer to the field application functions.
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(1)Delayed start of outdoor units in the same system
If it is necessary to operate the compressors simultaneously at multiple outdoor units, each outdoor unit will start, beginning with unit No. 1, after a delay of a number of seconds equivalent to the outdoor unit address.
The units do not start simultaneously.
This is in order to reduce the load on the power receiving equipment.
Outdoor unit
address 1
Outdoor unit
address 2
Starts after 1 second Starts after 2 seconds
(2) Delayed start for each system
At the time of factory shipment, delayed start for each system is not set to occur. Therefore when systems are linked and multiple systems are selected for start simultaneously by the central control device, all systems will begin operating simultaneously. For this reason, a function is included to delay the start time for each system address when systems are linked and multiple systems are selected for start by the central control device.
In order to enable this delay time, it must be set in the EEPROM for each system. Those systems where this setting has been made will start after a delay according to their system addresses.
* For information concerning EEPROM settings, refer to the field application functions.
2-3. Outdoor Unit Stop Rules
(1) Simultaneous stop of multiple outdoor units
When all outdoor units, or multiple outdoor units, must stop, the units stop at the same time. However, depend- ing on the communications timing, a difference of approximately 10 seconds may occur.
(2) Stopping individual outdoor units
The last unit to stop operating is the outdoor unit that contains the inverter compressor with the shortest amount of operating time .
In cooling mode, all inverter compressors in the outdoor units are designed to operate simultaneously. Therefore, all the outdoor units will stop at a time when any one unit is stopped. In heating mode, the out - door unit which has the inverter compressor with the shortest amount of operating time continues to run and rest of the other outdoor units may be stopped.
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