Toshiba MMU-AP0072H2UL Engineering Data Book page 91

5
Outdoor unit
Model
Appearance
name
Size: 2.19 × 2.35 (in)
Application
* Install the optional
PCB in the inverter
assembly of the
outdoor header unit.
Model
Appearance
name
Size: 2.87 × 3.11 (in)
Application
* Install the optional
PCB in the inverter
assembly of the
outdoor header unit.
[4] Snowfall fan control
Function
The outdoor unit fan operates at snowfall by connecting to the outdoor
unit interface PCB.
Operation
Header outdoor unit
Connection cable
(attached in this
Outdoor unit
optional PCB)
interface PCB
CN509
SW1: Snowfall detection switch (snowfall sensor)
Terminal Input Signal
ON
OFF
Cooling (SW1)
ON
OFF
Provide no-voltage continuous contacts for each terminal.
[1] Error / Operation Output
Function
The operation error output PCB can indicate operation and error states
by connecting to the interface PCB of outdoor units.
Operation
Operation output: The operation indicator is on while any indoor unit in
the system is operating.
Error output: The error indicator is on when an error is occurred on
even one of the indoor or outdoor units in the system.
Wiring example
Header outdoor unit
Optional PCB
Outdoor unit
C1
interface PCB
SW16
CN511
PJ20
ON
OFF
1 2 3 4
C1 Attached connection cable 1 (4wires)
CN511 Connector on interface side (green)
K1, K2 Relays
L1 Error indication Lamp
L2 Operation indication Lamp
OUTPUT1 Error output
OUTPUT2 Operation output
PJ20 Connector on optional PCB side
PS Power supply unit
TB1 Terminal block
* [OUTPUT3] is displayed when power is turned on.
90
Function
Locally procured
Optional PCB
Snowfall sensor
TB1
COM
P J 1 7 COOL
SW1
HEAT Shield
wire
Operation
Snowfall fan control (Fan in
outdoor unit operates.)
Normal operation
Function
Locally procured
TB1
L1
1
K1
OUTPUT1
2
L2
3
K2
OUTPUT2
4
5
Shield
OUTPUT3
6
wire
PS
PS