External Controller - Setting Up Programmable Digital Input Operation - LG THERMA V HN0916T Installation Manual

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.
Indoor PCB
Installation example #1
19 20
Max 10 m
CN_EXT
TB4
Field Installation Part
Installation example #2
19 20
Max 10 m
CN_EXT
TB4
Field Installation Part
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)
• SW : Single pole switch
- Select a part with contacts for extremely low
amperage
SW
- 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
Relay Circuit
X SW
X
• 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
ACCESSORIES INSTALLATION
CN_EXT
Power
supply
of relay
85
19 20
CN_EXT
The external
controller