Night Operation (Sound Reduction) Control : Tcb-Pcmo4Ul - Carrier MMY-MAP0724FT9UL Service Manual

7-3-5. Night operation (sound reduction) Control : TCB-PCMO4UL

SW1: Night time signal switch
Operation
This function decreases noise at night or other times as necessary.
Terminal
COOL
(SW1)
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.
Outdoor unit During low-noise mode*
(base unit)
Model 072 type
Model 096 type
Model 120 type
* Position of noise measuring device: 3.3 ft (1 m) from the front face of the set and 4.9 ft (1.5 m) above ground
(Measured in anechoic room)
Header outdoor unit
Connection
Outdoor unit
cable
interface PCB
CN508
Input signal Operation
Night time control
ON
OFF
Normal operation
ON
OFF
dB(A)
50
53
53
Optional PCB
TB1
COM
COOL
PJ17
HEAT
Capacity
Cooling Heating
approx. 85% approx. 80%
approx. 85% approx. 85%
approx. 80% approx. 80%
– 74 –
Locally procured
SW1
Shield
wire
Relative to maximum capacity