Emergency Operation - Daikin VRV II-Q RQYQ8-48PY1B Service Manual

Field Setting from Outdoor Unit

2.1.10 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 errors of other normal compressors.)
[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).
(1) In the Case of 1-Outdoor-Unit System
[Set the system to operation prohibition mode by compressor]
• In order to set an INV compressor to operation prohibition mode,
set No. 42 of Setting mode 2 to "EMERGENCY OPERATION".
(Procedure)
(1) Press and hold the MODE button (BS1) for a period of 5 seconds or
more.
(2) Press the SET button (BS2) 42 times.
(3) Press the RETURN button (BS3) once.
(4) Press the SET button (BS2) once.
(5) Press the RETURN button (BS3) twice.
(6) Press the MODE button (BS1) once.
• In order to set STD1 and STD2 compressors to operation
prohibition mode, set No. 19 of Setting mode 2 to "STD1, 2
OPERATION PROHIBITION".
(Procedure)
(1) Press and hold the MODE button (BS1) for a period of 5 seconds or
more.
(2) Press the SET button (BS2) 19 times.
(3) Press the RETURN button (BS3) once.
(4) Press the SET button (BS2) once.
(5) Press the RETURN button (BS3) twice.
(6) Press the MODE button (BS1) once.
• In order to set the STD 2 compressor to operation prohibition mode, set
No. 19 of Setting mode 2 to "STD2 OPERATION PROHIBITION".
(Procedure)
(1) Press and hold the MODE button (BS1) for a period of 5 seconds or
more.
(2) Press the SET button (BS2) 19 times.
(3) Press the RETURN button (BS3) once.
(4) Press the SET button (BS2) twice.
(5) Press the RETURN button (BS3) twice.
(6) Press the MODE button (BS1) once.
• For RQYQ16PY1, if the INV compressor is set to operation prohibition mode, only a single STD compressor
will operate for the convenience of oil equalization.
• For RQYQ16PY1, only the STD1 compressor cannot be put into operation prohibition mode for the
convenience of oil equalization.
• For the system with a single outdoor unit, automatic backup operation is not functional.
88
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LED display (h: ON
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Test Operation
SiBE341027
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