-
1
–
EN
FMD Module to Control the Indoor Fan Speed
The FMD-01
and FMD-03
modules
are
designed to set the speed of the DC motor of the indoor unit fan
using
the
PWM
(Pulse
Width
Modulation)
output
of
the
SCMI-01 unit. The module is built on a printed
circuit board equipped with rubber supports
and
one
hole
for
the fixing
screw.
Disconnect
the
indoor
unit from
the
power
mains
and open
the
outer
and
inner
side covers
of
the
indoor
unit.
Disconnect
the
DC-MOTOR
1
terminal,
which connects the
fan motor, from the control board of the indoor unit.
Attach the module into the hole in the plate, to which the terminal board and control board of the
indoor unit are attached, using the supplied 3,5x16mm
screw.
Insert the terminal
with
red
and
blue
wires
into
the
DC-MOTOR
1
terminal
on
the control board and insert the fan motor terminal into the
terminal on the FMD module.
After powering the
indoor
unit
you have
to
first
open
the
louvers,
which
direct the
airflow,
into
the
required position using the remote control.
If the indoor unit is connected to the power mains, indoor fan motor is supplied by the DC voltage
of
+300V,
its
speed
is
controlled
by
the
DC
control
voltage
of
+2.1
±
0.2
to
5.4
±
0.5V,
and
its
electronics is supplied by the DC voltage of +15V. These voltages are connected to the
DC-MOTOR
1
terminal
till after the indoor unit is started using the remote control. In order to need no remote control,
which has no other use with this application, the FMD module only use the voltage of +300V, which is
permanently
at
the
DC-MOTOR
1
terminal
after
connecting
the
indoor
unit
to
the
power
mains.
The
module converts this voltage into the voltage of +15V and control voltage of +1.9 to 5.9V to control the
indoor fan speed. After opening the louvers of the indoor unit using the remote control, it is suggested to
disconnect the terminal on the control board in order to disable the remote control receiver module and
thus prevent undesirable operation of the indoor unit.
The indoor fan speed is set remotely using the PWM output of the SCMI-01 control unit. In this
case, you must connect this unit with the FMD module via wiring, which connects the corresponding
VE+ and VE- terminals on the SCMI-01 (terminals 11 and 12) unit and FMD module. After that, the
indoor fan speed can be set by the SCMI-01 control unit as follows:
Setting the constant speed and control mode of the indoor unit fan
The fan speed is controlled according to the compressor speed in
The fan speed is controlled according to the compressor speed in
The output to control the indoor unit fan speed is not used
A more detailed description of setting the indoor unit fan speed is described in the user's guide for the
SCMI
-
01 unit, section 4.5.