Daikin VRV III REYQ8PY1, Service Manual

Page: 208 / 452

Si37-701 Field Setting
Test Operation 197
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, turn this switch to the BS side.
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
•
Example of connecting transmission wiring.
Connect the transmission wirings as shown in the Fig. 1.
SS2 SS1
This setting must be completed
before turning power supply ON. NOTE:
1
2
1
2
F2
B
C
A
F2
F1
F1 F2 F1
Outside unit
TO IN/D UNIT TO OUT/D UNIT
F1 F2
F1 F2 F1 F2
F1 F2
IN/D OUT/D.BS
REMOTE
CONTROLLER
BS unit A
F1 F2 F1 F2
IN/D OUT/D.BS
BS unit B
COOL/HEAT
selector
Branch wiring
Use 2-core wires.
(There is no polarity.)
B
C
A
REMOTE
CONTROLLER
COOL/HEAT
selector
Cool/heat selector remote
control wiring
Use 3-core wires.
(Keep in mind the polarity.)
F1 F2 F1 F2
IN/D OUT/D.BS
B
C
A
REMOTE
CONTROLLER
Final BS unit
Indoor unit for cooling
F2
F1
COOL/HEAT
selector
Fig. 1
F2
F1
F2
F1
F1 F2
F1 F2 F1 F2
IN/D OUT/D.BS
F1 F2
F1 F2
OUT/D.BS
To the indoor unit where
the selection of heating
and cooling is available.
Final BS unit
In case of the indoor unit connect as the cool-only unit, it wire
he terminal
of the last BS unit.
Cooling only
1st unit
Final unit