Mitsubishi Electric SEZ-KD VA Series, Service Manual

Page: 83 / 301

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10-3. LOWERING THE OPERATING NOISE OF THE OUTDOOR UNIT
With this function, you can lower the operating noise of the outdoor unit when the operation load is small,
for example, during night time in COOL mode.
However, note that the cooling and heating capacity can also be lowered if this function is activated.
Default setting is required to activate this function.
Please explain this function to your customers and ask them whether they want to use it.
[How to lower the operating noise]
(1) Turn OFF the breaker and make sure that the LED goes off.
(2) Set the "3" Switch of SW1 to ON to enable this function. (
MXZ-2D33VA/2D40VA/2D42VA/2D53VA/2D53VAH/
4D83VA/5D102VA )
Set the "3" Switch of SW2 to ON to enable this function. ( MXZ-3D54VA/3D54VA2/3D68VA/4D72VA )
(3) Turn ON the breaker.
ON
SW1
MXZ-2D33VA/2D40VA/2D42VA/2D53VA/2D53VAH
SW1 on the outdoor display P.C. board
MXZ-4D83VA/5D102VA
SW1 on the outdoor control P.C. board
ON
5 6
SW2
MXZ-3D54VA/3D54VA2/3D68VA/4D72VA
SW2 on the outdoor control P.C. board
10-4. AUTOMATIC LINE CORRECTING
This outdoor unit has an automatic line correcting function which automatically detects and corrects improper wiring or
piping.
<MXZ-2D33VA/2D40VA/2D42VA/2D53VA/2D53VAH>
Improper wiring or piping can be automatically detected when one indoor unit is operated in COOL mode for 30 minutes.
When improper wiring or piping is detected, wiring lines are corrected (A to B/ B to A) with the software.
NOTE: This function may not work due to the condition or environment of the unit, such as the following:
- gas leak, closed stop valve
- unit failure such as defective LEV
- indoor/outdoor temperature
NOTE: This function does not work when the "2" of SW2 on the outdoor display
P.C. board is turned OFF.
SW2
<Correct>
Indoor/outdoor
connecting wire
Terminal
block
Refrigerant pipe
Indoor unit B
Liquid/
Gas pipe
Indoor unit A
Outdoor unit
<Incorrect wiring>
Terminal
block
Indoor unit B
Liquid/
Gas pipe
Indoor unit A
Outdoor unit
<Incorrect piping>
Terminal
block
Indoor unit B
Liquid/
Gas pipe
Indoor unit A
Outdoor unit
B
A
B
A
B
A
B
A
B
A
B
A
MXZ-2D33VA/2D40VA/2D42VA/2D53VA/
MXZ-2D53VAH
SW2 on the outdoor display P.C. board
OBH626E