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6-8-5. Night operation (sound reduction) Control
Operation
This function decreases noise at night or other times as necessary.
The input signal is recognized during its rising/falling phase.
(After reaching the top/bottom of the rising/falling edge, the signal must remain there for at least 100 ms.)
The optional P.C. board should be connected to the header outdoor unit (U1).
The system's capacity is reduced during low-noise operation.
The table below provides a rough guide to this capacity reduction.
* Position of noise measuring device: 1 m from the front face of the set and 1.5 m above ground (anechoic sound)
Terminal
Input signal
Operation
COOL
(SW1)
Night time control
Normal operation
Outdoor unit
(base unit)
During low-noise mode*
dB(A)
Capacity
Relative to maximum capacity
Cooling
Heating
Model 0804
50
approx. 85%
approx. 80%
Model 1004
50
approx. 70%
approx. 65%
Model 1204
50
approx. 60%
approx. 55%
Model 1404
53
approx. 80%
approx. 80%
Model 1604
53
approx. 70%
approx. 70%
SW1: Night time signal switch
CN508
PJ17
TB1
SW1
COM
HEAT
COOL
Locally procured
Optional PCB
Header outdoor unit
Outdoor unit
interface PCB
Connection
cable
Shield
wire
ON
OFF
ON
OFF
