Selecting Outdoor Unit For Operation - Panasonic U-10MF1E8 Service Manual

2. Selecting Outdoor Unit for Operation

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.
2-2. Delayed Start of Outdoor Units
(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.
Starts after 1 second
(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,
depending 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.
●
If the indoor load decreases, and it becomes necessary to reduce the number of operating outdoor units, the
compressors are stopped individually, in sequence. When all compressors installed in an outdoor unit have
stopped, that outdoor unit also stops.
Outdoor unit Outdoor unit
address 1 address 2
Starts after 2 seconds
Outdoor unit
address 3
Starts after 3 seconds
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3-WAY SYSTEM
Control Functions
1