102
14.15 HA Terminal (HAJEM-A)
Enable digital connection from indoor unit to external devices.
Control items:
1 Start/stop input.
2 Start/stop signal output.
ON/OFF input
(Pin 1-2)
Monitor output
(Pin 1-2)
ON ON
OFF
Unit condition
200~300msec
+5V
Condition
1 1-2 (Pulse input): Unit ON/OFF condition switching with a pulse signal.
(1 pulse signal: shortage status 200~300msec)
2 3-4 (Static output): 5V output during the unit ON. No output at OFF.
Example of wiring:
MCU
HAJEM-A
(XH type)
Indoor Unit
PCB
+5V
11
1
1
#A4 #A4#B4
240 mm
Max 1900 mm
#A K1KA04AA0347 (Maker: JST; Maker code: B4B-XHTV4)
#B Maker: JST; Maker code: XHP-4
#B4
Core
4T
Note: The wire length from indoor unit to the external interface must be within 1.9 meters. The wire must be double
insulation type and a ferrite core to be added to reduce noise. Proposed core spec is J0KE00000147 with Heat
Shrinkage Tube.
The signal between indoor unit and the external interface must be isolated by photo-coupler of approval type (e.g:
Semko, VDE etc).
14.16 Demand Control
When the air-conditioner connected to Demand Response Enabling Devices (DRED), the power consumption
especially during peak hours could be controlled.
Relay 1
Relay 2
Relay 3
DRED AIR-CONDITIONER
DRM1
DRM2
DRM3
COM
Three Demand response modes (DRM) are available
o DRM1 = Compressor cut off
o DRM2 = Operate at 50% of rated input power
o DRM3 = Operate at 75% of rated input power
During DRM, the Power Indicator blinks (3 seconds ON and 0.5 seconds OFF) to indicate the compressor cut off
status.
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