Daikin VRV III REYQ8PY1 Service Manual page 208

Si37-701
3.2.4 Cool / Heat Mode Switching
Set Cool/Heat Separately for Each BS Unit by Cool/Heat Selector.
Set remote controller change over switch (SS1, SS2) as following:
•
When using cool/heat selector, connect to the terminal A, B and C on the EC of the electric
parts box.
EXAMPLE OF TRANSMISSION LINE CONNECTION
•
Outside 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
BS unit A
F1 F2 F2
F1
Test Operation
When using COOL/HEAT selector, turn this switch to the BS side.
1 1
2 2
SS1 SS2
Example of connecting transmission wiring.
Connect the transmission wirings as shown in the Fig. 1.
Branch wiring
Use 2-core wires.
(There is no polarity.)
F1 F2 F1 F2
IN/D OUT/D.BS
BS unit B
F1 F2
COOL/HEAT
selector
NOTE: This setting must be completed
before turning power supply ON.
In case of the indoor unit connect as the cool-only unit, it wire
he terminal of the last BS unit.
F1 F2
OUT/D.BS
F1 F2 F1 F2
IN/D OUT/D.BS
Final BS 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 BS unit
F1
COOL/HEAT
selector
Fig. 1
F1 F2 F1 F2
1st unit Final unit
Cooling only
A
B
F1 F2
OUT/D.BS
C
F1
F1
F2
COOL/HEAT
selector
Indoor unit for cooling
Field Setting
F2
F2
197