Mitsubishi Electric SEZ-M-DA Series, Service Manual

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<MXZ-2F33VF/2F42VF/2F53VF/2F53VFH
MXZ-2F33VF2/2F42VF2/2F53VF2/2F53VFH2
MXZ-2F33VF3/2F42VF3/2F53VF3/2F53VFH3>
<MXZ-3F54VF/3F68VF/4F72VF
MXZ-3F54VF2/3F68VF2/4F72VF2/4F80VF2
MXZ-3F54VF3/3F68VF3/4F72VF3/4F80VF3>
SW1 on the outdoor control P.C. board
11-4. LOWERING THE OPERATING NOISE OF THE OUTDOOR UNIT
With this function, the operating noise of the outdoor unit can be lowered by reducing the operation load, for example,
during nighttime in COOL mode.
However, note that the cooling and heating capacity may lower if this function is activated.
Changing the setting is required to activate this function. Explain about 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 "3" on SW1 to ON to enable this function. ( MXZ-2F33VF/2F42VF/2F53VF/2F53VFH, MXZ-2F33VF2/2F42VF2/
2F53VF2/2F53VFH2, MXZ-2F33VF3/2F42VF3/2F53VF3/2F53VFH3 ) Set "5" on SW1 to ON the enable this function.
( MXZ-3F54VF/3F68VF/4F72VF, MXZ-3F54VF2/ 3F68VF2/4F72VF2/4F80VF2, MXZ-3F54VF3/3F68VF3/4F72VF3/
4F80VF3 )
(3) Turn ON the power supply.
SW1 on the outdoor display P.C. board
ON
SW1
ON
5 6
SW1
<MXZ-3F54VF3 MXZ-3F68VF3 MXZ-4F72VF3 MXZ-4F80VF3>
•Before turning on the breaker, settings for dip switch (SW1) and jumper connector (SC751) are
necessary on the outdoor control P.C. board.
•It is recommended to activate the low standby power mode when none of the indoor units listed
in Table 1 is connected.
NOTE:
•Units come with low standby power mode deactivated as factory setting.
•When connecting one or more indoor units listed in Table 1, the outdoor unit does not work at
activated low standby power mode.
•In the event that SC751 is missing, outdoor unit will not work.
To activate low standby power mode:
Connect SC751 to CN750.
Set “2” on SW1 to ON.
To deactivate low standby power mode:
Connect SC751 to CN751.
Set “2” on SW1 to OFF.
In case that compressor is not in operation, and both LED1 (Red) and LED2 (Yellow) are not lit,
check the setting of low standby power mode on the outdoor control P.C. board.
And check the settings for dip switch (SW1) and jumper connector (SC751).
1 2 3 4 5 6
ON
1 2 3 4 5 6
ON
SW2
1 2 3 4 5 6
ON
SW1 MODE SC751
Activated CN750
Deactivated CN751
1 2 3 4 5 6
ON
SW1
Type
Wall-mounted
1way-cassette
4way-cassette
Ceiling-Concealed
Ceiling-Suspended
Model name
MSZ-AP**VF
MLZ-KP**VF
SLZ-M**FA
PEAD-M**JA(L)
SEZ-M**DA(L)
PCA-M**KA
Capacity
15 / 20
25 / 35 / 50
15 / 25 / 35 / 50
50
25 / 35 / 50 / 60
50 / 60
Table 1: List of the target models
SC751
CN750
SW871
CN751
OBH790D