Other Control; Backup Operation; Demand Operation; Heating Operation Prohibition - Daikin RXYQ96PYDN Service Manual

SiUS34-801A_b

9. Other Control

9.1

Backup Operation

If any of the compressors malfunctions, disable the relevant corresponding compressor or outdoor
unit, 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 setting are available.
Applicable model
(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]
(2) Emergency operation with outdoor unit PC board setting
[Setting method]
For detail of the setting method, refer to page 113.[Details of operation]
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.
Demand 1
Demand 2
9.3

Heating Operation Prohibition

Heating operation is prohibited above 75.2°F ambient temperature.
VRVIII R-410A Heat Pump 60Hz
Operating method
RXYQ72~120PYDN
RXYQ72~144PTJU
RXYQ144~240PYDN
RXYQ168~240PTJU
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.
Make setting of the compressor, the operation of which is to be disabled, in field setting
mode (setting mode 2).
Disable the compressor with the operation disable setting made from operating and only
operate other compressors.
Set item Condition
Mode 1
Mode 2
Mode 3
⎯
(1) Emergency operation with
remote controller reset
(Auto backup operation)
–
Backup operation by the
indoor unit
The compressor operates at approx. 60% or less of rating.
The compressor operates at approx. 70% or less of rating.
The compressor operates at approx. 80% or less of rating.
The compressor operates at approx. 40% or less of rating.

Other Control

(2) Emergency operation with
outdoor unit PC board setting
(Manual backup operation)
Backup operation by the
compressor
Backup operation by the
outdoor unit
Content
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