Temperature Control Operation Checklist; Final Refrigerant Charge Adjustment; Energy Saving And Optimum Operation - Daikin RZQ24TAVJU Installation Manual

10-2 Temperature control operation checklist

• After check operation is complete, check the temperature control
using normal operation.
(Heating is not possible if the outdoor temperature is 75°F (24°C) or
higher.)
(1) Make sure the indoor and outdoor units are operating normally.
(If liquid compression by the compressor or other abnormal
noises can be heard, stop the unit immediately, heat the crank
case for a sufficient amount of time, and try again.)
(2) Check to see if cold (or hot) air is coming out of the indoor unit.
(3) Press the fan direction and fan speed buttons on the indoor unit
to see if they operate properly.
<Precautions during temperature control checks>
• For around 5 minutes after the compressor stops, the compressor
will not run even if the "On/Off" button on the remote controller is
pressed.
• When the system operation is stopped by the remote controller, the
outdoor unit may continue operating for up to 1 minute.
• Malfunction code "U3" is displayed if check operation is not per-
formed using the test operation button the first time after installation.
Perform the check operation in accordance with "10-1 Power On–
Check Operation".
[Remote controller displays malfunction code]
(Check on a remote controller)
Malfunc-
Installation error
tion code
The stop valve of outdoor unit
is left closed.
E3
Refrigerant overcharge.
F6 Refrigerant overcharge.
The stop valve of outdoor unit
is left closed.
E4
Insufficient refrigerant.
Refrigerant overcharge.
The stop valve of outdoor unit
F3
is left closed.
Insufficient refrigerant.
Insufficient power supply volt-
U2
age
If check operation has not been
U3
performed.
No power is supplied to out-
U4
door unit.
If no dedicated indoor unit is
UA
being used.
12
Remedial action
Open the gas-side stop valve and the liq-
uid-side stop valve.
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 unit.
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 unit.
Open the gas-side stop valve and the liq-
uid-side stop valve.
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.
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 unit.
Open the gas-side stop valve and the liq-
uid-side stop valve.
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.
Check to see if the power supply voltage
is supplied properly.
Perform check operation.
Turn the power on for the outdoor
unit.
Check the indoor unit. If it is not a dedi-
cated unit, replace the indoor unit.
The stop valve of outdoor unit is
left closed.
UF
If the right indoor unit piping and
wiring are not properly con-
nected to the outdoor unit.
If the transmission wiring has
UH not be connected or it has
shorted.
• 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 piping installer, To the electrician
After the test operation, when handing the unit over to the customer,
make sure the front panel on the unit and all screws are attached.

10-3 Final refrigerant 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 50 ft. (15 m).
The outdoor temperature must be between 65°F (18°C) and 105°F (40°C).
The number of revolutions of the compressor must be greater than or
equal to the charge mode. (It can be confirmed by LED display on PC
board)
The number of revolutions of the compressor LED display.
( :Chargeable
Run the system for 60 minutes in cooling by the forced operation using
the field setting mode 2, No.20 LED
(Refer to Service Manual.) to allow pressures to stabilize.
Check subcooling of outdoor unit at LSV. Systems should have the tar-
get subcooling in the table below.
a. If the subcooling is low, add charge little by little 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.
Model
18·24 type
30·36 type
42 type
48 type
11. ENERGY SAVING AND OPTIMUM
OPERATION
The unit is 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.
Open the gas-side stop valve and the liq-
uid-side stop valve.
Make sure that the right indoor unit piping
and wiring are properly connected to the
outdoor unit.
Make sure the transmission wiring is cor-
rectly attached to terminals (X2M) F1/F2
(TO IN/D UNIT) on the outdoor unit circuit
board.
:Impossible to charge)
:ON, mode 2, No.7 LED :ON,
Target subcooling
6±1°F (3.33±0.56°C)
7±1°F (3.89±0.56°C)
8±1°F (4.44±0.56°C)
9±1°F (5.00±0.56°C)
English