Mitsubishi Electric MXZ-SM72TAM-U1 Service Manual page 92

Bit Function
3 High heating perfor-
mance mode
4 Maximum frequency
down at 1 hour after
COOL operation
5 Simultaneous cooling
and heating with
external heater
6 Manual defrost
*3. Make sure to wait for 5 minutes after turning the breaker ON.
*4. When the ambient temperature is 39°F (4°C) or below during heating operation, the freeze prevention heater is ener-
gized.
*5. When heating mode is OFF (include thermo-OFF in cooling mode), and the ambient temperature is 39°F (4°C) or be-
low, the freeze prevention heater is energized.
■ SW9: Function switch
Initial setting
<SM72/96>
ON
OFF
1 2 3 4 5 6
The black square (■) indicates a switch position.
Bit Function
1 Auto change over from
remote controller (IC
with the minimum
address)
2 Switching the Silent/
Demand mode
3 -
4 -
5 -
6 -
*6. When a PWFY series is connected, this function is always disable regardless of the switch.
8-6. Outdoor unit input/output connector
■ State (CN51)
A
L
1
~ L
2
E
■ Auto changeover (CN3N)
A
E SW1
~
SW2
■ Silent Mode/Demand Control (CN3D)
OCH800A_92
Operation in each switch setting
ON OFF When to set
Activated Deactivated Any time
Activated Deactivated Any time
Activated Deactivated Any time
Activated Deactivated During compres-
sor running in
HEAT mode.
<SM120>
ON
OFF
1 2 3 4 5 6
Operation in each switch setting
ON OFF When to set
Activated Deactivated Before
*6
turning the
power ON
Demand Silent mode Any time
control
- -
- -
- -
- -
B C
X
X
Y
Y
5
4
3
F G
B C
X
1
X
2
3
Y
Y
F G
Purpose
To raise the performance of HEAT
operation if it is insufficient.
To reduce condensation on the indoor unit
by lowering the frequency
The simultaneous operation of cooling and
heating will be possible by installing an
external heater to the CITY MULTI indoor
unit.
Turn ON when it is necessary to perform
the defrosting operation forcedly. (Effective
only at startup, or 10 minutes after the last
defrosting operation)
Purpose
Enables the indoor unit with the minimum
address to select AUTO mode, and
switches the operation mode of the other
indoor units to the same mode.
-
- -
- -
- -
- -
A: Distant control board
D
B: Relay circuit
CN51
C: External output adapter (PAC-SA88HA-E)
5
D: Outdoor unit control board
1 E: Lamp power supply
F: Procure locally
G: Max. 10m [32 ft]
L1: Error display lamp
L2: Compressor operation lamp
X, Y: Relay (coil rating: ≤ 0.9W. DC 12 VDC)
A: Remote control panel
D
B: Relay circuit
CN3N
C: External input adapter (PAC-SC36NA-E)
1
D: Outdoor unit control board
E: Relay power supply
3
F: Procure locally
G: Max. 10 m [32 ft]
SW1: Switch
SW2: Switch
X, Y: Relay (contact rating: ≥ 0.1 A. 15 VDC, min. applicable load: ≤ 1 mA)
SW1-ON: Heating, SW1-OFF: Cooling
SW2-ON: Validity of SW1, SW2-OFF: Invalidity of SW1
Additional information
The performance may not be raised
depending on the capacity of indoor
units in operation, or outside air
temperature.
The performance might be insufficient.
For the installation of external heater
and the indoor unit setting, refer to the
indoor unit service manual.
It performs the defrosting operation
forcedly. (HEAT operation is stopped
temporarily.)
Additional information
Cannot be set when the centralized
control is ON.
About the Silent mode/Demand control
setting, refer to "Outdoor unit input/output
connector".
-
-
-
-