Samsung RHF025EE Series Installation Manual page 22

Connecting the Unit (Continued)
External control 1
External control 2
EXT3 EXT2 EXT1
Report errors
External power
supply
External power
supply
Report On/Off condition
DAMPER
SW07
HEATER
HUMID
K13 K14 K15 K16
COMMON
DAMPER
22
E-
External Control
Use an external control to control the ventilator with separate machinery
or external contact point.
 Connect both sides of EXT1(EXT2 or EXT3).
- Up to 3 units can be connected at once.
- The picture displays the condition that 2 external controllers are connected.
If the external controller 1 or 2 are set to ON position, ventilator is operated
in the last used condition.
Connect to Report the Operation Condition
Use this function to check out the operation condition or errors of the ventilator.
Make sure that the current which flows through terminal should not exceed 0.5A.
 Install a lamp to check the operation condition to the ON/OFF output terminal.
- If the ventilator is turned on/off, the lamp is turned on/off followed by the
ventilator.
Lamp
Lamp
Connecting External Device
Connect to use humidifiers, heaters and dampers with the ventilator.
 Turn off the option switch to use,
- K13: The use of humidifiers
- K14: The use of heaters
- K15: The use of dampers
If the ventilator is operated, the external damper is operated as well

if it had been installed.
Make sure that the current is not exceed to 0.5A. When you connect

an external device over 0.5A, use an extra terminal relay.