Emergency Operation - Daikin VRV III RXYQ5-54PY1 Service Manual

Other Control
<In Cooling>
* "Master unit", "slave unit 1" and "slave unit 2" in this section are the names for installation.
5.2

Emergency Operation

If the compressor cannot operate, this control inhibits any applicable compressor or outdoor unit
from operating to perform emergency operation only with the operative compressor or outdoor
unit.
Caution
In order to disable the compressor operation due to a failure or else, be sure to do so
in emergency operation mode.
NEVER attempt to disconnect power supply wires from magnetic contactors or else.
(Doing so will operate compressors in combination that disables oil equalization
between the compressors, thus resulting in malfunctions of other normal
compressors.)
5.2.1 Restrictions for Emergency Operation
• In the case of system with 1 outdoor unit installed, only when thermostats of indoor units
having a capacity of 50% or more of the outdoor unit capacity turn ON, the emergency
operation is functional. (If the total capacity of indoor units with thermostat ON is small, the
outdoor unit cannot operate.)
• If the emergency operation is set while the outdoor unit is in operation, the outdoor unit stops
once after pump-down residual operation (a maximum of 5 minutes elapsed).
124
Normal operation
Master Slave 1 Slave 2
Priority Priority Priority
2 3
They are determined in installation work, and not changed thereafter. (These names are
different from "master unit" and "slave unit" for control.)
The outdoor unit connected the control wires (F1 and F2) for the indoor unit should be
designated as main unit.
Consequently, The LED display on the main PC board for "master unit", "slave unit 1" and
"slave unit 2" do not change. (Refer to the page 127.)
·
There are outdoor
units that stop
operation.
or
·
Low pressure of all
outdoor units in
operation < 0.25 MPa.
Outdoor unit
rotation
1
Normal operation
Master Slave 1 Slave 2
Priority Priority Priority
1 2
Si34-601A
3
Function