Heat Exchanger Control - Daikin REYQ-TA Series Service Manual

SiUS371614E
5.7

Heat Exchanger Control

While in heating or cool/heat simultaneous operation, ensure target condensing and evaporating
temperature by changing over the air heat exchange of outdoor unit to the evaporator or the
condenser in response to loads.
Single system
Outdoor unit
Lower side Upper side
Condenser Condenser
CL decrease CL increase
HL increase HL decrease
Outdoor unit
Lower side Upper side
— Condenser
Multi outdoor unit system
Outdoor unit
1
Lower side Upper side Lower side Upper side
Condenser Condenser Condenser Condenser
CL decrease
HL increase
Outdoor unit
1
Lower side Upper side Lower side Upper side
Condenser Condenser Condenser Condenser
CL decrease
HL increase
Outdoor unit
1
Lower side Upper side Lower side Upper side
Condenser Condenser —
CL decrease
HL increase
Outdoor unit
1
Lower side Upper side Lower side Upper side
— Condenser —
CL decrease
HL increase
Outdoor unit
1
Lower side Upper side Lower side Upper side
— Condenser —
<Symbol meanings>
CL: Cooling Load
HL: Heating Load
Functions and Control
CL decrease
HL increase
CL increase
HL decrease
2 3
Lower side Upper side
Condenser Condenser
CL increase
HL decrease
2 3
Lower side Upper side
— Condenser
CL increase
HL decrease
2 3
Lower side Upper side
Condenser — Condenser
CL increase
HL decrease
2 3
Lower side Upper side
Condenser — Condenser
CL increase
HL decrease
2 3
Lower side Upper side
Condenser — —
Outdoor unit
Lower side Upper side
Evaporator Condenser
CL decrease
HL increase
Outdoor unit
Lower side Upper side
Evaporator Evaporator
Lower side Upper side
Evaporator Condenser
CL decrease
HL increase
Lower side Upper side
Evaporator Evaporator
CL decrease
HL increase
CL CL
decrease increase
HL HL
Lower side Upper side
increase decrease
Evaporator Evaporator
CL decrease
HL increase
Lower side Upper side
Evaporator Evaporator
CL increase
HL decrease
Outdoor unit
1 2
Lower side Upper side
— —
Outdoor unit
1 2
Lower side Upper side
— —
Outdoor unit
1 2
Lower side Upper side
Evaporator Evaporator
Outdoor unit
1 2
Lower side Upper side
Evaporator Evaporator
Basic Control
3
Lower side Upper side
— —
CL increase
HL decrease
3
Lower side Upper side
— —
CL increase
HL decrease
3
Lower side Upper side
— —
CL increase
HL decrease
3
Lower side Upper side
Evaporator Evaporator
72