Heating - Mitsubishi Electric MXZ-2D33VA Service Manual

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 power supply 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/2D42VA2/2D53VA/2D53VA2/
2D53VAH/2D53VAH2/4D83VA/5D102VA)
Set the "3" Switch of SW2 to ON to enable this function. (MXZ-3D54VA/3D54VA2/3D68VA/4D72VA)
Set the "5" Switch of SW1 to ON to enable this function. (MXZ-6D122VA)
(3) Turn ON the power supply.
MXZ-2D33VA/2D40VA/2D42VA/2D42VA2/2D53VA/2D53VA2
MXZ-2D53VAH/2D53VAH2
SW1 on the outdoor display P.C. board
MXZ-4D83VA/5D102VA
SW1 on the outdoor control P.C. board
SW1
ON
MXZ-6D122VA
SW1 on the outdoor control P.C. board
SW1
ON
5 6
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/2D42VA2/2D53VA/2D53VA2/2D53VAH/2D53VAH2>
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.
<Correct>
Terminal
block
Liquid/
Gas pipe
Outdoor unit
<Incorrect wiring>
Terminal
block
Liquid/
Gas pipe
Outdoor unit
<Incorrect piping>
Terminal
block
Liquid/
Gas pipe
Outdoor unit
OBH626K
B
A
Indoor unit B
B
A
Indoor unit A
B
A
Indoor unit B
B
A
Indoor unit A
B
A
Indoor unit B
B
A
Indoor unit A
MXZ-3D54VA/3D54VA2/3D68VA/4D72VA
SW2 on the outdoor control P.C. board
SW2
ON
5 6
MXZ-2D33VA/2D40VA/2D42VA/2D42VA2
MXZ-2D53VA/2D53VA2/2D53VAH/2D53VAH2
SW2 on the outdoor display P.C. board
SW2
Indoor/outdoor
connecting wire
Refrigerant pipe
119