Fujitsu ARXG45KHTA Design & Technical Manual page 26

¢ Auxiliary heater output
When indoor unit fan and compressor is turned on in heating operation, the signal is output from
connector.
Specifications of the signal output performance are as shown as follows:
Example: When set temperature (Ts) is set at 22 °C;
• And room temperature (Tr) increase above 12 °C,
signal output is ON.
• And Tr increase above 21 °C, signal output is
OFF.
• And Tr decrease below 19 °C, signal output is ON.
• And Tr decrease below 10 °C, signal output is
OFF.
 Fan delay setting
This is used to continue the indoor unit fan operation for 1 minute after thermo OFF in heating
mode.
For the detail setting on fan delay setting, refer to "Function settings on indoor unit" in
settings " on page 24.
 Circuit diagram example
12 V
• *: Make the distance from the PCB to the connected unit within 10 m.
• Relay spec: Rated DC 12 V, 50 mA or less.
Heating
operation
Indoor unit fan
Output signal
CAUTION
• Place an external heater between the indoor unit and the outlet.
• Be sure to use delay control of the fan.
8-3. External output
Indoor unit
control PCB
Example: Relay unit
Connector
1
On/Off
2
*10 m
Operation
Stop
On
Off
On
Off
Supply air
Tr-Ts = -1 °C
Tr-Ts = -10 °C
Connected unit
Signal
Locally purchased
Indoor
External
heater unit
Return air
- 22 -
Tr-Ts
OFF
Tr-Ts = -3 °C
ON
Tr-Ts = -12 °C
OFF
"Function
Example: Heater
Relay
power
supply
1 min
8. External input and output