Daikin VRV-WIII RWEYQ72PTJU Service Manual page 127

SiUS30-1301
3.7.2 Cool/Heat Mode Switching (Heating and Simultaneous Cooling/Heating
Operation Connection)
Set Cool/Heat Separately for Each Branch Selector Unit by Cool/Heat Selector.
(1) Before turning ON the power of the Branch Selector unit, set the DIP switch (DS1-1) on the Branch Selector unit PCB as
following.
(2) Then, connect the COOL/HEAT selector to the terminal A, B and C of the terminal block X1M on the Branch Selector
unit PCB.
 This setting is read into the micro-computer when turning ON the power supply.
 Be sure to make the setting before turning ON the power supply.
 Be sure to close the Electrical Components Box lid after setting.
Example of transmission line connection
 Example of connecting transmission wiring.
Connect the transmission wirings as shown in the Fig. 1.
Condensing unit
TO IN/D UNIT TO OUT/D UNIT
F1 F2 F1 F2
A
B
F1 F2 F1 F2
IN/D OUT/D.BS
C
Branch Selector unit A
F1 F2 F2
F1
Field Setting
1 2
ON
OFF
DS1
Branch wiring
Use 2-core wires.
(There is no polarity.)
F1 F2 F1 F2
CON.B.S.
IN/D
Branch Selector unit B
F1 F2
COOL/HEAT
selector
X1M
A B C
COOL/HEAT selector
In case of the indoor unit connect as the cool only unit, it wire
the terminal of the last Branch Selector unit.
F1 F2
OUT/D.BS
F1 F2 F1 F2
IN/D OUT/D.BS
Final Branch Selector unit
To the indoor unit where
the selection of heating
and cooling is available.
Cool/heat selector remote
control wiring
Use 3-core wires.
(Keep in mind the polarity.)
A
B
F1 F2
IN/D
C
Final Branch Selector unit
F1
COOL/HEAT
selector
Fig. 1
Field Setting from Condensing Unit
F1 F2
Final unit
1st unit
Cooling Only
A
B
F1 F2
CON.B.S.
C
F1
F1
F2
COOL/HEAT
selector
Indoor unit for cooling
Note:
F1 F2
F2
F2
119