Snowfall Fan Control; External Master On/Off Control - Toshiba MMY-MAP0804HT8JP Service Manual

6-8-3. Snowfall Fan Control

SW1: Snowfall detection switch (snowfall sensor)
Operation
An external snowfall signal turns on the outdoor unit fan.
Terminal
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).

6-8-4. External master ON/OFF Control

SW1: Operation input switch
SW2: Stop input switch
Operation
The system is started/stopped from the outdoor unit.
Terminal
ON
COOL
(SW1)
OFF
ON
HEAT
(SW2)
OFF
The input signal is recognized during its falling phase. (After reaching the bottom of the falling edge, the signal must
remain there for at least 100 ms.)
CAUTION
(1) Do not turn on the COOL (SW1) and HEAT (SW2) terminals simultaneously.
(2) Be sure to provide a contact for each terminal.
External signal: No-voltage pulse contact
The optional P.C. board should be connected to the header outdoor unit (U1).
Header outdoor unit
Connection
Outdoor unit
cable
interface PCB
C N 5 0 9
Input signal Operation
Snowfall fan control
(Turns on outdoor
unit fan)
Normal operation
(Cancels control)
Header outdoor unit
Connection
Outdoor unit
cable
interface PCB
C N 5 1 2
Input signal Operation
Turns on all indoor
units
Turns off all indoor
units
Locally procured
Optional PCB
TB1
COM
COOL
P J 1 7
HEAT Shield
wire
Locally procured
Optional PCB
TB1
COM
P J 1 7 COOL
HEAT
Shield
wire
– 110 –
Snowfall sensor
SW1
SW1
SW2