
85
ACCESSORIES INSTALLATION
ENGLISH
External Controller - Setting up programmable digital input
operation
If you require control depending on external digital input(ON/OFF), connect cable to indoor
PCB(CN_EXT).
Follow below procedures step 1 ~ step 4.
Step 1. Check if the power of the unit is turned off.
Step 2. Disassemble front panels and distinguish control box(Indoor) of the
unit
Step 3. Check of the harness(Blue) is insert fully to the indoor unit PCB
(CN_EXT)
Step 4. Connect the external controller part to terminal block 4(19, 20) using
one of below installation examples.
Determining the purpose of CN_EXT
Setting value: 0 ~ 5 step Indoor CN-EXT port setting
- 0: default
- 1: Simple operation on / off
- 2: Dry contact (simple contact)
- 3: Emergency stop only for indoor unit
- 4: Reattachment / absence
- 5: Emergency stop of all indoor units (It can be set only when indoor unit has emergency stop
function)
CN_EXT
Indoor PCB
Installation example #2
• SW : Single pole switch
- Select a part with contacts for extremely low
amperage
- DC 5 V ~ 12 V is used at the contact point
- Switch load is approximately 0.5 ~ 1 mA
• Control cable
- Cable size : 22 to 26 AWG
- Don’t extend the cable more than 10 meters
• X : Relay(a point of contact, fixed DC 0.5 ~ 1 mA)
• SW : Distance ON/OFF switch
• Control cable(Indoor unit to Relay Circuit)
- Cable size : 22 to 26 AWG
- Don’t extend the cable more than 10 meters
Installation example #1
TB4
SW
Max 10 m
Field Installation Part
CN_EXT
19
20
TB4
X
Max 10 m
Field Installation Part
X
SW
Power
supply
of relay
Relay Circuit
CN_EXT
19
20
CN_EXT
19
20
The external
controller