Daikin RXYQ96PYDN, Service Manual

Page: 233 / 567

Other Control SiUS34-801A_b
218 VRVIII R-410A Heat Recovery 60Hz
9. Other Control
9.1 Backup Operation
If any of the compressors goes wrong, disable the relevant compressor or the relevant outdoor unit
from operating, and then conduct emergency operation only with operational compressors or
outdoor units.
Emergency operation with remote controller reset and Emergency operation with outdoor
unit PC board settings are available.
(1) Emergency operation with remote controller reset
[Operating method]
Reset the remote controller. Press the RUN/STOP button for 4 seconds or more.
[Details of operation]
Disable the defective outdoor unit from operating, and then only operate other outdoor units.
On systems with 1 outdoor unit, this emergency operation is not available.
(2) Emergency operation with outdoor unit PC board setting
[Setting method]
Change the setting of the compressor to the emergency operation setting as explained in
Section 12, Field Setting on Page 95 in Section 2.
For details of the setting method, refer to page 264.[Details of operation]
Disable the compressor with the operation disable setting and only operate other
compressors.
9.2 Demand Operation
In order to save the power consumption, the capacity of outdoor unit is saved with control forcibly
by using
Demand 1 Setting or Demand 2 Setting .
To operate the unit with this mode, additional setting of Continuous Demand Setting or
external input by external control adapter is required.
9.3 Heating Operation Prohibition
Heating operation is prohibited above 75.2°F ambient temperature.
Operating method
Applicable model
(1) Emergency operation with
remote controller reset
(Auto backup operation)
(2) Emergency operation with
outdoor unit PC board setting
(Manual backup operation)
REYQ72 ~ 120PYDN
REYQ72~144PTJU
–
Backup operation by the
compressor
REYQ144 ~ 240PYDN
REYQ168~240PTJU
Backup operation by the indoor
unit
Backup operation by the
outdoor unit
Set item Condition Content
Demand 1 Mode 1 The compressor operates at approx. 60% or less of rating.
Mode 2 The compressor operates at approx. 70% or less of rating.
Mode 3 The compressor operates at approx. 80% or less of rating.
Demand 2
⎯
The compressor operates at approx. 40% or less of rating.