Sanyo SGP-E70J2GU2 User Manual page 106

Construction
2)Controlling indoor units on several refrigeration systems
Note 1) The power supply cabling for the indoor units should be carried out for each separate
Note 2) The signal cable from the centralized control device should be connected to be the same
Note 3) The maximum number of units that can be connected to the same signal cable is 64
Note 4) If the indoor/outdoor operation cable is connected in a loop then communication is not
Note 5 On the common communication cable (indoor/outdoor operation cable) outdoor unit
Earth leakage
breaker
Earth leakage
breaker
Grounding
Remote control
wiring
Same refrigerant system
■Cautions regarding the indoor/outdoor operation cable
Do not connect the cable in a loop.
Outdoor Unit
Indoot Unit
refrigeration system.
(If this cannot be done then use the bus system or the relay at a pull box.
Also, power cabling for outdoor units should be separate for each outdoor unit.
signal cable as the indoor/outdoor operation cable. (no polarity)
indoor units, and 30 outdoor units.
possible. Therefore, do not connect in a loop.
board S7 (terminal resistance ON/OFF switch), all units save one should be set to the OFF
side (when shipped from the factory they are set to ON).
Outdoor
unit 1
Grounding
Indoor/outdoor
operation cable
Indoor unit Indoor unit
1 X
Grounding
Separately Separately
sold item sold item
Remote Remote
control control
Outdoor Unit
Indoot Unit
3. Points regarding electrical construction (indoor unit)
Earth leakage
breaker
Indoor unit
(UH)
Earth leakage
Grounding
breaker
Separately
sold item
Remote
control
Same refrigerant system
Outdoor Unit
Forbidden
Indoot Unit
E - 19
Outdoor
unit 2
Grounding
To other systems
Indoor unit Indoor unit
2 X
Grounding Grounding
Separately Separately
sold item sold item
Remote Remote
control control
Forbidden
Indoot Unit Indoot Unit