Daikin ERQ Series, Service Manual

Page: 51 / 153

ESiEN09-06 A Other Control
Function 41
5. Other Control
5.1 Emergency Operation (only for ERQ 250 A7W1B)
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.
5.1.1 Restrictions for Emergency Operation
• In the case of system with 1 outdoor unit installed, only when thermostats of AHUs having a
capacity of 50% or more of the outdoor unit capacity turn ON, the emergency operation is
functional. (If the total capacity of 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).
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.)