Samsung MH18ZC1(C2)-09 Service Manual page 28

5-3 Checking and Testing Operations (Outdoor Unit)
To complete the installation, perform the following checks and tests to ensure that
the air conditioner is operating correctly.
1. Review all the following elements in the installation:
• Installation site strength
• Piping connection tightness to detect any gas leakages
• Connection wiring
• Heat-resistant insulation of the piping
• Drainage
• Earthing wire connection
• Correct operations (follow the steps below)
• Room select switch in the indoor unit
2. Apply the power to the outdoor unit.
- Check the fuse (250V~, 5A) : The fuse is open when the power line
OUTDOOR UNIT
TEST OPERATING
C B
b C
A : PCB display
B : Red LED
C : PCB switch
Samsung Electronics
(L, N) is short.
3. Check the connection of PCB communication of outdoor unit.
(Check whether the red LED of outdoor unit PCB is flickering.)
• The communication lamp is flickering after the display of each unit on
the outdoor PCB display part. (every one second).
LED is not flikering, if the connection is bad or the room select switch
is located in the wrong position.
- LED lamp (red) flickering after display of A (0.5 sec)
a
- LED lamp (red) flickering after display of b (0.5 sec)
- LED lamp (red) flickering after display of C (0.5 sec)
Note : PCB switch "C" is used for triple split multi air conditioner.
Result : If all of three units display lamps are flickering, the connec-
A
tion wires and the room option connections are good.
If the lamp is not flickering, check as follows:
A. Check the display part of indoor unit of each unit (A,B) after out-
door unit PCB switch S/W-A is on.
Check the status of each unit indoor room select switch.
(Adjust the select switch suitable to the unit A, B.)
- A unit : STANDARD LED on, TIMER LED flickering
- B unit : STANDARD LED on, TIMER and NATURE LED flickering
- C unit : STANDARD LED on, TIMER and NATURE, POWER LED
UNIT
B. Check the communication connection of outdoor unit PCB
(Check whether the red LED of outdoor unit PCB is flickering).
The communication lamp is flickering after the display of each unit on
the outdoor unit PCB. (every one second)
- LED lamp (red) is flickering after display of A (0.5 sec)
- LED lamp (red) is flickering after display of b (0.5 sec)
- LED lamp (red) is flickering after display of C (0.5 sec)
Result: If all of three units display lamps are flickering, the connec-
tion wires and the room option connections are good.
4. Check the test operation status by pressing the PCB switch
S/W-A and S/W-B of outdoor unit.
• Check the operation status by pushing the switch one at time.
• Perform the test operation only for the unit selected last.
• Check the pipe pressure and the other operation status during the test
operation.
• Check items when the error occurs during the test operation (each
unit)
- Check there is enough refrigerant.
- Check pipe connections.
flickering (In case of triple split multi air conditioner)
STANDARD TIMER
A
B
C
Lamp ON
NATURE POWER
Lamp OFF Lamp Flasher
5-5