Toshiba Carrier TCB-IFDMR01UP-UL Service Manual page 41

Terminal DI2 / DI2: External trouble Input
• An AHU fan operation monitor (Field supply), could be attached at this dry contact terminal (For example, the
abnormality of the fan motor). A closed contact generates the check code L30.
Terminal DI3 / DI3: Forced thermostat OFF Input
• When signal input, AHU is in "thermostat-off" status forcibly.
Terminal DI4 / DI4: Notice code Input
• If there is input, a spanner mark will be displayed on the remote controller. The system will not stop.
Check "DN settings" for the setting method.
Terminal DI5 / DI5: Operation Mode Input (Cool / Heat)
• Cool / Heat mode selection over a dry contact.
If the contact is short-circuited, system changes to heat mode.If the contact is open, system changes to cool mode.
• Only cool mode and heat mode are available.
Function
Mode Input Cool / Heat
When Bit4 of SW502 is turned on in DDC type, capacity demand can be achieved by short-circuiting Terminals DI2 to
DI4.
Short - circuit Cooling step
DI2 - DI2 2
DI3 - DI3 5
DI4 - DI4 11
* If all are short-circuited, the DI3 function has priority.
When SW701 is ON (no voltage), apply a voltage of DC12 V ± 10% and wiring as follows.
MAX. 328'1" (100 m)
SIGNAL (+) DI2 - DI4
SIGNAL (-) DI2 - DI4
Terminal DI6 / DI6: External ON/OFF Input
• When using with DDC, it starts by turning on this terminal
TCB-IFDMR01UP-UL
(Terminal block with relay)
DI6
(Input, DC5 V)
DI6
Terminal
DI5 / DI5
Heating step
4
9
13
Locally procured
Signal Voltage (DC12 V ± 10%)
GND
Normally open
MAX. 328'1" (100 m)
Locally procured
Relay coil signal
OPEN
COOL mode active
- 41 -
SHORT
HEAT mode active