Daikin VRV EMERION RXYQ-AATJA, Руководство по обслуживанию, Страница: 127 / 429

SiUS342303E Other Control
Part 4 Functions and Control 120
8. Other Control
8.1 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
PCB setting" are available.
(1) Emergency operation with remote controller reset
[Operating method]
Reset the remote controller. (Press the ON/OFF button for 4 seconds or more.)
[Details of operation]
Disable the defective outdoor unit from operating temporarily, and then only operate other outdoor
units.
(On the system with 1 outdoor unit, this emergency operation is not available.)
(2) Emergency operation with outdoor unit PCB setting
[Setting method]
Make setting of the unit, "the operation of which is to be disabled", in field setting mode (setting
mode 2).
[Details of operation]
Disable the defective outdoor unit from operating, and then only operate other outdoor units.
(On the system with 1 outdoor unit, this emergency operation is not available.)
8.2 Heating Operation Prohibition
 When outdoor air temperature is too high, outdoor unit cannot operate in heating mode
because:

Low pressure sensor can give pressure value above upper limit of sensor: error JC .
 Mechanical internal load on compressor increases.
 Low compression ratio can result in insufficient compressor internal oil lubrication.
 Heating is disabled when outdoor air temperature is above 26°C (78.8°F).

Forced thermostat-OFF on indoor units.
 Outdoor fan operates ≥ 200 rpm.
 Heating operation is enabled when outdoor air temperature drops below 24°C (75.2°F).