Heat Exchange Mode In Heating Operation Or Simultaneous Cooling / Heating Operation - Daikin VRV - WII Service Manual

Normal Control
5.3 Heat Exchange Mode in Heating Operation or
Simultaneous Cooling / Heating Operation
In heating or simultaneous cooling / heating operation, a target condensing and evaporating
temperature can be secured by switching the water heat exchanger of the outside unit into
evaporator or condenser with load.
One outside unit installation
Four-way changeover valve for
heat exchanger [Y7S] (For the
application of heat exchanger)
Content of the control of
electronic expansion valve [Y1E]
∆GR>0
Four-way changeover valve for
heat exchanger [Y7S] (For the
application of heat exchanger)
Content of the control of
electronic expansion valve [Y1E]
Two outside units installation
Four-way changeover valve for
heat exchanger [Y7S] (For the
application of heat exchanger)
Content of the control of
electronic expansion valve [Y1E]
Four-way changeover valve for
heat exchanger [Y7S] (For the
application of heat exchanger)
Content of the control of
electronic expansion valve [Y1E]
∆GR>0
Four-way changeover valve for
heat exchanger [Y7S] (For the
application of heat exchanger)
Content of the control of
electronic expansion valve [Y1E]
Four-way changeover valve for
heat exchanger [Y7S] (For the
application of heat exchanger)
Content of the control of
electronic expansion valve [Y1E]
Four-way changeover valve for
heat exchanger [Y7S] (For the
application of heat exchanger)
Content of the control of
electronic expansion valve [Y1E]
68
Master unit
OFF
(Condenser)
Control of heat exchange
capacity balance
∆GR <0
Master unit
ON
(Evaporator)
Control of heat exchange
capacity balance
Master unit
OFF
(Condenser)
Control of heat exchange Control of heat exchange
capacity balance capacity balance
∆GR>0 ∆GR <0
Master unit
OFF
(Condenser)
Control of heat exchange
capacity balance
∆GR>0 ∆GR <0
Master unit
OFF
(Condenser)
Control of heat exchange Control of heat exchange
capacity balance capacity balance
Master unit
ON
(Evaporator)
Control of heat exchange
capacity balance
∆GR>0 ∆GR <0
Master unit
ON
(Evaporator)
Control of heat exchange Control of heat exchange
capacity balance capacity balance
Note 1: ∆GR =Target of heat exchange capacity balance
– Actual measurement of heat balance
∆GR >0: Insufficient evaporation
(Excessive condensation)
∆GR <0: Insufficient condensation
(Excessive evaporation)
2: Control of heat exchange capacity balance
Control the electronic expansion valve so that Te or Tc
will obtain the target value.
Slave unit 1
OFF
(Condenser)
Slave unit 1
ON
(Evaporator)
0 pulse
∆GR<0
Slave unit 1
ON
(Evaporator)
Slave unit 1
ON
(Evaporator)
0 pulse
Slave unit 1
ON
(Evaporator)
SiUS30-604
Function