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Adaptors for Connection of Air Conditioners
Si30-408
218
Appendix
Cautions
•
Specifications of connecting wires
Sheathed wire (2 wire) of 0.75 to 1.25 mm
2
in size
•
Length of connecting wirings
Be sure to observe the following limits. Not heeding so may result in the malfunction of
transmission.
Total wiring length: 2000 m or less
Maximum numbers of branches: 16 branches
4. In order to perform input for the demand/low noise control, connect to the terminal block of
this adapter.
Demand input terminals
Short circuit between (Demand 1) and (C)...Reducing power consumption to approx. 70% as a
guide
Short circuit between (Demand 2) and (C)...Reducing power consumption to approx. 40% as a
guide.
Short circuit between (Demand 3) and (C)...Forced thermostat OFF
Low noise input terminals
Short-circuiting between terminals saves capacity control (i.e., control of outdoor unit fan low-
speed rotation or operating frequency of compressor) in cooling operation.
Use these terminals only with a low level of load at nighttime.
Notes:
In order to input the demand/low noise control, use the switch on the outdoor unit PC board
to set mode to low noise control “YES”.
1. Outdoor unit field setting
• Setting mode 1...Turn ON low noise control as explained in the outdoor unit’s service
manual.
• Setting mode 2...Match low noise and demand addresses to the external control adapter
address.
2. External control adapter settings
• Function switch (SS1)
Set SS1 to either “BOTH“ or “DE“.
• Address setting switch (DS1, DS2)
Match DS1 and DS2 to the low noise and demand addresses of outdoor unit.
2
P2
3 C
F1
F2
P1
1
Demand
Low
noise
Outside wiring indicated
by dotted line.
To external control adapter
of other outdoor units
Host computer monitor panel or demand controller
(Input signal)
Normally open contact
An approx. 10-mA input current is required per contact.
Use micro-current contacts for relay contacts.
(Specifications of outside wirings)
Recommended electric wires: Sheathed vinyl cords or cables 0.75 to 2m
2
Wiring length: Within 150 m
In order to prevent malfunctions, keep this wiring a minimum 50 mm
away from the power lines.
How to set demand control in the field