Samsung AM250FNBFEB/EU User Manual

Troubleshooting
Samsung Electronics 4-69
4-4-25 Communication Error between MCU and Outdoor Unit
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Indoor Unit Display
Judgment Method
Special Cause
Outdoor Unit Display
1. Inspection Method
-
Yes
Yes
MCU Installation Quantity Setup Switch for
Outdoor Unit PCB Compare and check the set values
and the actual MCU installation quantity.
Press the reset key (K3) of the outdoor unit PCB
and check the display module to check the quantit
y
of MCU which responds to tracking.
Remove the communication cable which
connects the outdoor unit to the MCU, and measure
the 2 cables of the outdoor unit with a scope.
Is there any response from the
MCU on the display module
during tracking?
Check the communication cable which connects the outdoor unit
to the MCU. If there is no peculiarity, connect the MCUs one by
one to find the MCU which interferes with the communication
to check and change the MCU PCB.
Is the voltage between the 2 cables
a square wave with DC±0.7V or more?
Are the quantity of
the actually installed MCUs and the set value
of the installation quantity setup
switch the same?
Correctly set the install
ation quantity setup switch
of the outdoor unit MCU, and press the reset key (K3)
of the outdoor unit PCB to re-execute tracking.
After two minutes, find the MCU which displays
the communication error and check if the PCB
address
settings are overlapped.
(A communication error occurs if the indoor unit
addresses are overlapped.)
- In this case, a communication error will occur
in every MCU (2 or more units) with the address
incorrectly set.
If there is no peculiarity in the address
, then check
the communication cable and change the MCU PCB.
Change the communication cable and the connector
of the outdoor PCB, and then change the PCB.
Yes
No
No
No
❈ Essential Requirements before Changing PCB in Case of Communication Error: Refer to p.4-80

Samsung AM250FNBFEB/EU Specifications

General

Type	Air conditioner indoor unit
Multi-split	-
Product color	White
Gas hose diameter	15.88 mm
Liquid hose diameter	9.52 mm
Refrigerating medium	R410A
Air conditioner functions	Heating
Heating capacity (nominal)	85300 BTU/h
Heating capacity in watts (max)	25000 W
Cooling capacity in watts (nominal)	- W
Operating temperature (heating) (T-T)	-20 - 24 °C
AC input voltage	220-240 V
Current (heating)	23.1 A
AC input frequency	50-60 Hz
Design load (cooling)	- kW
Energy efficiency scale	A+ to G
Power consumption (heating) (max)	5000 W
Hourly energy consumption (cooling)	- kWh
Energy efficiency class (heating) (Average heating season)	A+
Indoor unit type	Wall-mountable
Indoor unit depth	330 mm
Indoor unit width	518 mm
Indoor unit height	1210 mm
Indoor unit weight	104000 g
Indoor units quantity	1
Indoor unit package depth	426 mm
Indoor unit package width	652 mm
Indoor unit package height	1289 mm
Indoor unit package weight	107000 g
Indoor unit sound power level	42 dB
Indoor unit noise level (high speed)	61 dB
Outdoor unit noise level	- dB