Interlocked Connection To Air Conditioner - Fujitsu UTZ-BD035B Technical Manual

3-4. INTERLOCKED CONNECTION TO AIR CONDITIONER

● Operation is performed simultaneously with the air conditioner.
● Setting changes are made by energy recovery ventilator switch.
Relay
Air conditioner
Air conditioner
remote controller
 Connection method
● Perform electrical work in accordance with the laws and regulations of each country.
● Check whether or not there is an external output and the necessary connector terminals at the air conditioner using the air conditioner technical
manual beforehand. The external output (operation status output) of the indoor unit PC board is used.
● There is a type of external output from the air conditioner which requires an external power source and a type which does not require an
external power source. The type is different depending on the model.
● The allowable voltage/current of the external output circuit from the air conditioner varies depending on the model. Check it with the air
conditioner technical manual.
● Do not connect the energy recovery ventilator power source (AC220-240V) to the external output terminals from the air conditioner.
● Regarding the relay circuit, select the necessary capacity from the allowable current value of the external output terminals and the current value
of the energy recovery ventilator and connect.
(1) When energy recovery ventilator operation is unnecessary
For energy recovery ventilator, airflow switching and heat exchange ventilation / normal ventilation switching cannot be
performed.
The figure shown below indicates the operation with airflow HIGH and heat exchange ventilation.
Indoor unit PC board
Power source
AC220-240V
50Hz
N L
Relay circuit
Provided at the site
- (01-15) -
Energy recovery ventilator
Energy recovery
ventilator switch
Energy recovery ventilator
terminal
L
N
SW1
SW2
COMMON
LOW
HIGH
DAMPER