Toshiba MMY-MUP0961HT6P-UL Service Manual page 88

6-2-3-5. Night operation (sound reduction) Control
Header outdoor unit
Outdoor unit
interface PCB
SW1: Night time signal switch
Operation
This function decreases noise at night or other times as necessary.
Terminal Input signal
ON
OFF
COOL
(SW1)
ON
OFF
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.
Night operation sound
Model
reduction dB(A)
MMY-
(COOL/HEAT)
MUP0721* 50/50
MUP0961* 50/50
MUP1201* 54/53
MUP1441* 54/53
MUP1681* 54/54
MUP1921* 52/54
MUP072H1* 50/50
MUP096H1* 54/53
MUP120H1* 54/53
* Position of noise measuring device: 1 m from the front face of the set and 1.5 m above ground (anechoic sound)
• COM terminals have DC12 V output with a basic insulation.
Use a switch, such as a relay or photo coupler, insulated from a controller (locally procured) for
CO (Change-Over) contact or NO (normally-open) contact.
• DC12 V has a current-limiting resistor of 3.3 k .
• For non-voltage contacts, use a relay with minimum applicable load of DC12V,3mA or less.
Connection
Optional PCB
cable
CN508 PJ17
Operation
Night time control
Normal operation
Capacity
COOL
Approx. 85% Approx. 85%
Approx. 70% Approx. 70%
Approx. 85% Approx. 80%
Approx. 85% Approx. 70%
Approx. 80% Approx. 65%
Approx. 60% Approx. 60%
Approx. 85% Approx. 85%
Approx. 90% Approx. 90%
Approx. 85% Approx. 80%
- 88 -
Locally procured
TB1
COM
COOL
SW1
HEAT
Shield
wire
HEAT