Daikin RQYQ140-180PY1 Service Manual page 54

Detailed Control Functions
2.5.6 Heat Exchanger Control
While in heating or cool/heat simultaneous operation, ensure target condensing and evaporating temperature by
changing over the air heat exchanger of outdoor unit to the evaporator or the condenser in response to loads.
[Single system]
Outdoor unit
Left side Right side
Condenser Condenser
GR > 25 GR < -20
Outdoor unit
Left side Right side
Evaporator Condenser
[Multi outdoor unit system]
A1
1
Condenser Condenser Condenser
GR > 15
A2
1
Condenser Condenser Evaporator
GR > 25
A3
1
Condenser Evaporator
GR > 15
A4
1
Condenser Evaporator Evaporator
45
GR > 25
GR < -20
Note 1. "GR" is a numeric value representing the current balanced
Outdoor unit
2 3
Note 2. On the system with two outdoor units, if there is no step for the
GR < -10
Outdoor unit
2 3
GR < -20
Outdoor unit
GR > 25
2 3
GR < -20
–
GR < -10
Outdoor unit
GR > 25
2 3
Outdoor unit
Left side Right side
–
Evaporator
GR > 15 GR < -10
Outdoor unit
Left side Right side
Evaporator Evaporator
condition and calculated from target condensing temperature,
target evaporating temperature, current condensing temperature,
and current evaporating temperature.
destination of transition, that step will be skipped.
B1
1
–
GR > 15
B2
1
Evaporator Evaporator
GR > 15
B3
1
Evaporator Evaporator Evaporator
Note 1. "GR" is a numeric value
representing the current
balanced condition and
calculated from target
condensing temperature,
target evaporating
temperature, current
condensing temperature,
and current evaporating
temperature.
Outdoor unit
2 3
–
Evaporator
GR < -10
Outdoor unit
2 3
–
GR < -10
Outdoor unit
2 3
SiBE341001
Function