Si30-408 Adaptors for Connection of Air Conditioners
Appendix 227
3. Method of extending system
Using two units of expander adapters enables the connection of a maximum of 30 outdoor
units (of 300 HP or less). An example of connection is shown in figure below.
Note: If additional extended adapters should be installed due to expansion or else after wires are
connected as shown below, a significant change of the wiring within the system will be needed.
Therefore, if any expansion is scheduled, follow an example of basic wiring shown in figure
below.
Example of basic wiring
Even though there are several restrictions on the use of expander adapters, these restrictions
can be relaxed by cutting jumper wires.
Cut the jumper wire “J2”. → The use of expander adapter in combination with thermal storage
controller will be enabled.
Cut the jumper wire “J3”. → The use of expander adapter in combination with external control
adapter for outdoor unit will be enabled.
The wiring
is branched
off into
two systems.
1 unit
10 units
······
1 unit
10 units
······
1 unit
10 units
······
Note)
: Main bus
: Branch bus
J4 J3 J2 J1
Cut jumper wires at both sides in
two locations.
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