Daikin RQYQ140-180PY1 Service Manual page 68

Detailed Control Functions
[All-room cooling → all-room heating or simultaneous cooling and heating]
HP/LP gas pipe
Suction gas pipe
HP/LP gas pipe
Suction gas pipe
HP/LP gas pipe
Suction gas pipe
[All-room heating or simultaneous cooling and heating → all-room cooling]
HP/LP gas pipe
Suction gas pipe
HP/LP gas pipe
Suction gas pipe
59
Liquid
pipe
Cooling Cooling Cooling
Liquid
pipe
Liquid
pipe
Heating Heating Heating
Liquid
pipe
Heating Heating Heating
Liquid
pipe
Ventilation Ventilation Ventilation
HP/LP gas pipe
Suction gas pipe
Liquid
pipe
Cooling Cooling
(1) While all indoor units are in cooling
•
Cooling Cooling
(2) Mode changeover
•
All indoor units
(3) Heating or simultaneous cooling and
Each indoor unit
Heating Heating
Heating Heating
Ventilation Ventilation
Cooling Cooling Cooling
operation
HP/LP gas pipe is used as a suction gas
pipe.
Switch HP/LP gas pipe from low to high
pressure
• Fan stop
• Changeover time is 3.5 minutes
(changeover time for control). (During
the changeover: stop the compressor
for 30 seconds.)
heating
• Starts the hot air supply operation by
cold air prevention control (3-5
minutes)
(1) While the unit is in heating operation or
simultaneous cooling and heating
operation
• HP/LP gas pipe is used as a discharge
gas pipe.
(2) Mode changeover
• Switch HP/LP gas pipe from high to low
pressure
All indoor units
• Ventilation
• Changeover time is 3.5 minutes
(changeover time for control). (During
the changeover: Stop the compressor
for 30 seconds.)
(3) Change all units to cooling operation.
• Cool air supply operation
SiBE341001
Function