Maintenance Procedures For Indoor Units; To Check The General Status Of The Unit; To Clean The Cover Plates; To Clean The Indoor Unit Heat Exchanger - Daikin VRV IV+ Service Manual

5 Maintenance
5.3 Maintenance procedures for
indoor units
5.3.1

To check the general status of the unit

Prerequisite: Switch off all the indoor units.
Prerequisite: Stop the unit operation (via the user interface, central
controller, operation switch, ...).
1 Clean the cover plates, see
page 142.
2 Check if any other equipment interferes with the operation of
the indoor unit (other device exhaust towards indoor unit heat
exchanger, oil mist, water vapour etc, corrosive or explosive
ambient, electrical equipment, blocked air outlets or inlets,
etc...) Refer to installation manual.
3 Make sure that there is sufficient air flow or no air by-pass on
the indoor unit heat exchanger in cooling mode.
4 Check superheat
Normally the expansion valve for the indoor unit is driven to
keep minimum
If not, even if the filters are cleaned, it might be that:
▪ the heat exchanger is clogged by dust (see
indoor unit heat exchanger" on
▪ an air by-pass is present,
▪ the fan cannot deliver discharge air due to longer supply duct,
▪ expansion valve is malfunctioning (see next step).
5 The best way to judge expansion valve bleeding is to operate
indoor units in cooling, set the dedicated indoor unit to Fan only
operation and then check refrigerant thermistors by Service
Checker. Fan only operated indoor unit sets EV to 0 pulse. If
the gas thermistor on the indoor unit is close to evaporation
temperature and does not rise to ambient temperature in time,
the expansion valve is bleeding and needs to be replaced.
Once check is completed switch to other indoor unit and set the
operation to Fan only and proceed in similar manner.
6 Clean the inside of the unit.
NOTICE
To clean the inside of the unit:
▪ Use water or compressed air, not warmer than 50° C.
▪ Do not use any cleaning agents or chemicals.
▪ Do not use pressurized water.
7 Check the general status inside the cover plates.
8 Check if the drain is properly drained by pouring water in the
drain pan. Check drain pan and drain piping if this is not the
case.
9 Check the visual appearance of all the components. Refer to
component check methods if any irregularity is found.
10 Check the flare connections and their surrounding for oil drips
and signs of leaks.
11 Check the electrical connections. Tighten and secure the
connections when necessary.
12 Check if power supply is in conform with legislation. See
check if the power supply is conform with the regulations" on
page 131.
13 Check and tighten the power supply wiring on the dedicated
terminal.
14 Check the insulation on piping and refrigerant branches.
Replace or fix insulation where necessary.
Service manual
142
https://daikin-p.ru/catalog/vrv-daikn/naruzhnye-vrv-bloki-daikin
"5.3.2 To clean the cover plates" on
for refrigerant.
3K of superheat.
"5.3.3 To clean the
page 142),
INFORMATION
Depending on the setting of parameter 20-0 on the indoor
unit remote controller, a filter sign is indicated on the
remote controller (or central controller if present). This
indicates that the time that was set by the parameter has
passed and filter cleaning is required. For more
information, refer to installation manual for the indoor unit.
15 Remove the air filters. Clean the filter with a vacuum cleaner or
water or compressed air. When the filter is clogged and too
dirty, use a soft brush and natural detergent to clean it. Dry the
filter in shade. You may need to remove duct connections for
ceiling duct type units. Refer to installation manual for the
indoor unit.
16 Make sure there is a filter on the air suction line for the indoor
unit. Refer to installation manual for the indoor unit.
INFORMATION
When air filters are not cleaned at regular intervals, dust
begins to accumulate on the indoor unit heat exchanger.
17 Check the indoor unit heat exchanger and clean him if
necessary, see
exchanger"
Normally this is not a required step if the unit is not exposed to
oil mist alike exhaust and when filters are cleaned regularly.
To clean the indoor unit heat exchanger it may be necessary to
remove bottom plate, side covers, drain pan, fan propeller and
fan motor to gain access to the indoor unit heat exchanger.
18 Check wireless remote controller battery (if present).
19 Log the maintenance in the log-book.
After outdoor unit and indoor unit (see
for indoor units" on page 142) maintenance is performed, check the
system via Service Checker for normal operation. See
based troubleshooting" on
5.3.2

To clean the cover plates

1 Clean the cover plates with a wet cloth.
NOTICE
To clean the plate work:
▪ Use water or compressed air, not warmer than 50° C.
▪ Do not use any cleaning agents or chemicals.
▪ Do not use pressurized water.
5.3.3

To clean the indoor unit heat exchanger

1 Straighten the hair fins.
2 Clear the indoor unit heat exchanger from dust, leaves,... using
a fin-comb or compressed air/N
CAUTION
Avoid bending or damaging the hair fins of the indoor unit
heat exchanger during the cleaning process.
Is the problem solved?
Yes
"To
No
"5.3.3 To clean the indoor unit heat
on page
"5.3 Maintenance procedures
"2.4 Symptom
page 73.
2.
Action
No further actions required.
Return to the troubleshooting of
the specific error and continue
with the next procedure.
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07
142.