Daikin VRV IV-S Series Installation Manual Download Page 18

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[Remote controller displays malfunction code]
(Check on a remote controller connected to the indoor unit.)

• When using a central controller, see the installation manual or ser-

vice manual which came with the central controller.

[If nothing is displayed on the remote controller]

• There might be a problem with the connections or communication

between the indoor unit and the remote controller.
Make sure all the wiring is properly connected.

CAUTION

To the pipe-layer, To the electrician

After the test run, when handing the unit over to the customer, make
sure the front panel on the unit and all screws are attached.

10-3 Final charge adjustment

It is not necessary to do this final adjustment normally, but perform the
following operation only when the most adequate refrigerant charge for
the best performance is required and the piping length between the out-
door and indoor units is less than 50ft.(15m).
The outdoor temperature must be between 60°F (16°C) and 97°F (36 °C).

Run the system for 30 minutes in cooling by the forced operation using
the field setting mode 2, No.6 (value 0: OFF, 1:ON) (Refer to Service
Manual.) to allow pressures to stabilize.

Check subcooling of outdoor unit at LSV. Systems should have the
target subcooling in the table below.

a. If the subcooling is low, add charge to raise subcooling to the target

value. (The maximum additional charge is 2.2 lbs.(1kg))

b. If the subcooling is high, remove charge to lower the subcooling to

the target value.

11. ENERGY SAVING AND OPTIMUM

OPERATION

RXTQ~ units are equipped with advanced energy saving functionality.
Depending on the priority, emphasis can be put on energy saving or
comfort level. Several parameters can be selected, resulting
in the optimal balance between energy consumption and comfort for the
particular application.

Several patterns are available and explained below. Modify the param-
eters to the needs of your building and to realize the best balance
between energy consumption and comfort.

Refer to Service Manual for changing the field settings.
Setting definition:[A-B]=C;A=mode,B=setting NO.,C=setting value.

11-1 Three main operation methods are available:

•

Basic

The refrigerant temperature is fixed independent from the situation.
It corresponds to the standard operation which is known and can be
expected from/under previous VRV systems:

• To activate this operation method under cooling operation:

change field setting [2-8]=2.

• To activate this operation method under heating operation:

change field setting [2-9]=2.

•

Automatic(default)

The refrigerant temperature is set depending on the outdoor ambient
conditions. As such adjusting the refrigerant temperature to match
the required load (which is also related to the outdoor ambient
conditions).
E.g., when your system is operating in cooling, you do not need as
much cooling under low outdoor ambient temperatures (e.g.,
77°F(25°C)) as under high outdoor ambient temperatures (e.g.,
95°F(35°C)).
Using this idea, the system automatically starts increasing its refrig-
erant temperature, automatically reducing the delivered capacity
and increasing the system’s efficiency.

• To activate this operation method under cooling operation:

change field setting [2-8]=3(default).

E.g., when your system is operating in heating, you do not need as
much heating under high outdoor ambient temperatures (e.g.,
59°F(15°C)) as under low outdoor ambient temperatures (e.g., 23°F
(–5°C)).
Using this idea, the system automatically starts decreasing its refrig-
erant temperature, automatically reducing the delivered capacity
and increasing the system’s efficiency.

• To activate this operation method under heating operation:

change field setting [2-9]=1 (default).

Malfunc-

tion code

Installation error

Remedial action

The stop valve of an outdoor
unit is left closed.

Open the gas-side stop valve and the liq-
uid-side stop valve.

Refrigerant overcharge.

Recalculate the required amount of refrig-
erant from the piping length and correct
the refrigerant charge level by recovering
any excessive refrigerant with a refriger-
ant recovery machine.

Refrigerant overcharge.

Recalculate the required amount of refrig-
erant from the piping length and correct
the refrigerant charge level by recovering
any excessive refrigerant with a refriger-
ant recovery machine.

The stop valve of an outdoor
unit is left closed.

Open the gas-side stop valve and the liq-
uid-side stop valve.

Insufficient refrigerant.

Check if the additional refrigerant charge
has been finished correctly.

Recalculate the required amount of refrig-
erant from the piping length and add an
adequate amount of refrigerant.

Refrigerant overcharge.

Recalculate the required amount of refrig-
erant from the piping length and correct
the refrigerant charge level by recovering
any excessive refrigerant with a refriger-
ant recovery machine.

The stop valve of an outdoor
unit is left closed.

Open the gas-side stop valve and the liq-
uid-side stop valve.

Insufficient refrigerant.

Check if the additional refrigerant charge
has been finished correctly.

Recalculate the required amount of refrig-
erant from the piping length and add an
adequate amount of refrigerant.

Insufficient supply voltage

Check to see if the supply voltage is sup-
plied properly.

If a check operation has not
been performed.

Perform a check operation.

No power is supplied to an out-
door unit.

Turn the power on for the outdoor
unit.

If no dedicated indoor unit is
being used.