Mitsubishi Electric MXZ-SM72TAM-U1 Service Manual page 90

Bit Function
1 Select operating
system startup
2 Clear connection
information
3 Clear error history
4 Pump down
5 -
6 -
■ SW3: Trial operation
Initial setting
ON
OFF
1 2
The black square (■) indicates a switch position.
Bit Function
1 ON/OFF from outdoor
unit
*1
2 Mode setting
*1. Test run on PWFY series cannot be run by the outdoor unit. Use a switch on the indoor unit or a remote controller to
perform test run.
■ SW2/SW4/SW8/SW9: Model switch
Model selection
MODEL
MXZ-SM72TAM
MXZ-SM96TAM
MXZ-SM120TAM
The black square (■) indicates a switch position.
Bit When to set
1-6 Before the power is turned ON.
■ SW5: Function switch
Initial setting
ON
OFF
1 2 3 4 5 6 7 8
The black square (■) indicates a switch position.
Bit Function
1 -
2 Change the indoor
unit's LEV opening at
startup
3 -
4 Auxiliary heater
5 Change the indoor
unit's LEV opening at
defrost
6 Decreasing the target
sub cool (Heating
mode)
OCH800A_90
Operation in each switch setting
ON OFF When to set
With Without Before turning
centralized centralized the power ON
controller controller
Activated Deactivated Before turning
the power ON
Activated Deactivated OFF to ON
under suspen-
sion after the
power is turned
on.
Activated Deactivated While the
compressor is
running
- -
- -
Operation in each switch setting
ON OFF When to set
Activated Deactivated Any time after the power
is turned ON.
Heating Cooling
SW2 SW4 SW8
ON ON ON ON
OFF OFF
OFF OFF
1 2 3 4 5 6
1 2 3 4 5 6 1 2
ON
ON ON
OFF
OFF OFF
1 2 3 4 5 6
1 2 3 4 5 6 1 2
ON ON ON
OFF
OFF OFF
1 2 3 4 5 6 1 2 3 4 5 6 1 2
Operation in each switch setting
ON OFF When to set
- -
Activated Deactivated Any time
- -
Activated Deactivated Before
turning the
power ON
Activated Deactivated Any time
Activated Deactivated Any time
Purpose
Turn ON when the centralized
controller is connected to the
outdoor unit.
To clear connection informa-
tion.
To clear error history.
To facilitate outdoor unit the
pumping down operation.
Frequency = Fixed to 65 Hz
Indoor-linear expansion valve
= Fully open
Outdoor fan step = Fixed to 10
- -
- -
SW9
ON
OFF
3 4 5 6
ON
OFF
3 4 5 6
ON
OFF
3 4 5 6
Purpose
- -
To set the LEV opening at startup higher
than usual (+150 pulses). To improve the
operation with the LEV almost clogged.
- -
To transmit a connection permission signal
of the auxiliary heater to the connected
CITY MULTI indoor unit.
To set the LEV opening higher than usual
during defrosting operation. (Only Qj ≤ 10
is valid, + 300 pulses) To avoid the
discharge temperature increase and
provide efficient defrosting operation.
To reduce the discharge temperature
decrease due to refrigerant liquid accumu-
lation in the units.
Additional information
• SW2-1 must be turned ON if a centralized control-
ler is connected to the system. An example of this
would be a TC-24, EB50A, AG150, AE50 or
AE200. If SW2-1 is OFF, while using a centralized
controller, in rare circumstances problems may be
encountered such as indoor units not responding
to group commands.
• Group setting of 2 or more A-IC units which are
connected to branch box via centralized controller
is not allowed.
• Clear connection information when relocating units
or connecting additional units.
-
Refer to a section referring to the pumping down on
outdoor units Installation Manuals. It might not be
possible to collect all the refrigerant if the amount is
excessive.
Do not perform pump down work when there is a gas
leak. The intake of air or other gases causes
abnormally high pressure in the refrigeration cycle,
which may cause explosion or injury.
-
-
Additional information
-
The refrigerant flow noise at startup
become louder.
-
Turn ON the switch only when the
auxiliary heater is connected and
operated.
The refrigerant flow noise during the
defrosting operation become louder.
A refrigerant flow noise might be generat-
ed if the sub cool value is too small.