• Circuit diagram example
Locally purchased
Indoor unit
control PCB
Connector
1
12 V
On/Off
2
Signal
Relay
power
supply
Example: Heater
Connected unit
Example:
Relay unit
10 m*
– Relay spec.: Rated DC 12 V, 50 mA to less.
– *: Make the distance from the PCB to the connected unit within 10 m.
On
Off
Operation
Stop
Heating
operation
Indoor unit fan
On
Off
Output signal
1min
CAUTION
• Locate an external heater between the indoor unit and the outlet.
External
Heater
Supply air Return air
Indoor unit
• Be sure to use delay control of a fan.
• Optional part
Indoor unit type Part name Model name
Compact cassette — —
Cassette — —
Slim duct
External control set
UTD-ECS5A
Duct UTD-ECS5A
Floor/Ceiling — —
Ceiling — —
- 231 -
6-1. Indoor unit 6. External input and output
SYSTEM
DESIGN
SYSTEM
DESIGN
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