Daikin FMDQ50B7VEB Installation And Operation Manual Download

Page: 12 / 18

Installation and operation manual

FMDQ50~125B7VEB

Air conditioning system

4PW48241-1

External static pressure settings

Settings for external static pressure can be achieved in 2 ways:

Using the airflow automatic adjustment function

Airflow automatic adjustment is the volume of blow-off air that
has been automatically adjusted to the rated quantity.

Make sure the test run is done with a dry coil.

If the coil is not dry, run the unit for 2 hours with fan only to dry
the coil.

Check if the power supply wiring to the air conditioning unit is
completed along with the duct installation.

If a closing damper is installed in the air conditioning unit, make
sure that it is open.
Also check if the air filter is properly attached into the air
passage on the air suction side of the air conditioning unit.

If there is more than one air inlet and outlet, adjust the dampers
so that the airflow rate of each air inlet and outlet is conform with
the designed airflow rate.

Make sure the air conditioning unit is in fan operation mode.
Press and set the airflow adjustment button on the remote
controller to change the airflow rate to H or L.

Setting of the airflow automatic adjustment settings.

When the air conditioning unit is running in fan operation mode
perform the next steps:
-

stop the air conditioning unit,

go to field setting mode,

select mode No. 21 (or 11 in case of group setting),

set the first code No. to “7”,

set the second code No. to “03”.

Return to normal operating mode after setting these settings
and press the ON/OFF operation button. The operation lamp will
light up and the air conditioning unit will start the fan operation
for airflow automatic adjustment.

After 1 to 8 minutes, the air conditioning unit stops operating
automatically when the fan operation for airflow automatic
adjustment has been carried out, the operation lamp will be off.

When the air conditioning unit has stopped, check on an indoor
unit if the second code No. of mode No. 21 is set to “02”.

If the air conditioning unit does not stop operating or the second
code No. is not “02”, repeat step 4.
If the outdoor unit is not turned on, the display on the remote
controller will show “

” or “

” (refer to

"Test operation" on

page 10

). However, you can continue setting this function

because these messages are only applicable to outdoor units.
After setting this function, be sure to turn on the outdoor unit
before performing the test operation on the outdoor unit.
If any other error display occurs on the display of the remote
controller, refer to

"Test operation" on page 10

and the operation

manual of the outdoor unit. Check the defective point.

Using the remote controller

Check on an indoor unit if the second code of mode No. 21 is set to
“01” (= factory setting). Change the second code according to the
external static pressure of the duct to be connected as shown in
table 2.

Table 2

Control by 2 Remote Controllers (Controlling 1 indoor
unit by 2 remote controllers)

When using 2 remote controllers, one must be set to "MAIN" and the
other to "SUB".

MAIN/SUB CHANGEOVER

■

Insert a wedge-head screwdriver into
the recess between the upper and
lower part of the remote controller and,
working from the 2 positions, pry off
the upper part.
(The remote controller PC board is
attached to the upper part of the
remote controller.)

■

Turn the main/sub changeover switch on one of the two remote
controller PC boards to "S".

(See figure 17)

(Leave the switch of the other remote controller set to "M".)

Do not adjust the dampers during fan operation for
airflow automatic adjustment.

Mode

No.

First

code No.

Second

code No.

Setting content

11 (21)

Airflow adjustment is OFF

Completion of airflow adjustment

Start of airflow adjustment

■

If there is no change after airflow adjustment in the
ventilation paths, be sure to perform setting the
automatic airflow adjustment again.

■

Contact your dealer if there is no change after
performing airflow adjustment in the ventilation paths,
after performing the test operation of the outdoor unit
or when the air conditioning unit is moved to another
location.

■

If booster fans, an outdoor air processing unit or HRV
via duct are used, do not use automatic airflow
adjustment control with a remote controller.

■

If the ventilation paths have been changed, perform
the setting of the airflow automatic adjustment again
as described above from step 3 onwards.

NOTE

The second code No. is set to “03” by default.

Mode No.

First

code No.

Second

code No.

External static pressure (Pa)