Daikin HXY080A8V1BF, Installation And Operation Manual

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125A8V1BF
VRV IV System indoor unit
4P405267-1C – 2021.04
Installation and operation manual
25
8.6. Service and maintenance
In order to ensure optimal operation of the unit, a number of checks
and inspections on the unit and the field wiring have to be carried out
at regular intervals.
This maintenance should be carried out by your local installer.
To execute maintenance first remove the panels as shown in
"7.4.2. To close the indoor unit" on page 16 .
8.6.1. Maintenance activities
Checks
The described checks must be executed at least once a year by
qualified personnel.
1 Pressure relief valve hose (if present)
Check that the pressure relief valve hose is positioned
appropriately to drain the water.
2 Water pressure relief valve
Check for correct operation of the pressure relief valve by
turning the red knob on the valve counter-clockwise:

If you do not hear a clacking sound, contact your local dealer.

In case the water keeps running out of the unit, close both
the water inlet and outlet shut-off valves first and then contact
your local dealer.
3 Switch box
Carry out a thorough visual inspection of the switch box and look
for obvious defects such as loose connections or defective
wiring.
4 Water pressure
Check if the water pressure is above 1 bar.
If necessary add water.
5 Water filter
Clean the water filter.
8.6.2. Malfunction codes list
A more detailed malfunction code list can be found in the installation
manual of the outdoor unit.
8.6.3. Important information regarding the refrigerant used
This product contains fluorinated greenhouse gases. Do not vent
gases into the atmosphere.
Refrigerant type: R410A
GWP
(1)
value: 2087,5
(1)
GWP = global warming potential
DANGER: ELECTRICAL SHOCK
See "7.3.1. Precautions on electrical wiring work" on
page 14 .
WARNING: ELECTRIC SHOCK

Before carrying out any maintenance or repair activity,
always switch off the circuit breaker on the supply
panel, remove the fuses or open the protection
devices of the unit.

Do not touch live parts for 10 minutes after the power
supply is turned off because of high voltage risk.

Please note that some sections of the electric
component box are hot.

Make sure you do not touch a conductive section.

Do not rinse the unit. This may cause electric shocks
or fire.
Play it safe!
Touch a metal part by hand (such as piping sheet metal) in
order to eliminate static electricity and to protect the PCB
before performing service.
Malfunction
code Failure cause Corrective action
A1 Failure of writing memory
(EEPROM malfunction)
Contact your local dealer.
A6
Malfunction water circuit • Make sure waterflow is
possible (open all valves in
the circuit).
• Force clean water through
the unit.
• Malfunction of pump.
• Malfunction of flowswitch.
A9 R410A expansion valve
malfunction.
• Check wiring connections.
• Contact your local dealer.
AA
Heater kit malfunction • Make sure water flow is
possible.
• Contact your local dealer.
AJ
Capacity malfunction. Contact your local dealer.
C1
Bad ACS communication. Contact your local dealer.
C4 R410A liquid thermistor
malfunction.
• Check wiring connections.
• Contact your local dealer.
C9
Returning water thermistor
malfunction.
• Check wiring connections.
• Contact your local dealer.
CA
Heating/cooling leaving
water thermistor malfunction.
• Check wiring connections.
• Contact your local dealer.
CJ
User interface thermostat
thermistor malfunction.
Contact your local dealer.
E3
High pressure malfunction.
This malfunction is outdoor
unit related. Refer to outdoor
unit manual.
• Make sure the circuit is
filled with water (no air
inside, e.g. is the air purge
open?)
• Make sure water flow is
possible (open all valves in
the circuit).
• Make sure the water filter is
not blocked.
• Make sure all refrigerant
stop valves are open.
• Contact your local dealer.
E4
Low pressure malfunction.
This malfunction is outdoor
unit related. Refer to outdoor
unit manual.
Contact your local dealer.
J7 R410A gas thermistor
malfunction.
• Check wiring connections.
• Contact your local dealer.
U1
The phases of the power to
the unit is reversed.
This malfunction is outdoor
unit related. Refer to outdoor
unit manual.
Exchange two of the three
phases (L1, L2, L3) to make a
positive phase connection.
U2 Power supply malfunction.
This malfunction is outdoor
unit related. Refer to outdoor
unit manual.
• Check wiring connections.
• Contact your local dealer.
UA
Type connection problem. • Wait till initialisation
between outdoor module
and hydro module finished
(after power ON, wait at
least 12 minutes).
• Contact your local dealer.
UH Address malfunction. Contact your local dealer.