Starting Up The Outdoor Unit; Configuration; Facility Setting; To Set The Facility Mode - Daikin RXM20R5V1B Installer's Reference Manual

7.6

Starting up the outdoor unit

See the indoor unit installation manual for configuration and
commissioning of the system.
8

Configuration

8.1

Facility setting

Use this function for cooling at low outdoor temperature. This
function is designed for facilities such as equipment of computer
rooms. NEVER use in a residence or office where people occupy the
space.
8.2

To set the facility mode

When cutting jumper J6 on the PCB, the operation range will expand
to –15°C. The facility mode will stop if the outdoor temperature drops
below –20°C and resume when the temperature rises again.
INFORMATION
▪ The indoor unit may produce Intermittent noise due to
the outdoor unit fan turning ON and/or OFF.
▪ Do NOT place humidifiers or other items which might
raise humidity in rooms when you use the facility mode.
▪ Cutting jumper J6 sets the indoor unit fan to the highest
speed.
▪ Do NOT use this setting in residences or offices with
people.
9

Hand-over to the user

Once the test run is finished and the unit operates properly, please
make sure the following is clear for the user:
▪ Make sure that the user has the printed documentation and ask
him/her to keep it for future reference. Inform the user that he can
find the complete documentation at the URL mentioned earlier in
this manual.
▪ Explain the user how to properly operate the system and what to
do in case of problems.
▪ Show the user what to do for the maintenance of the unit.
▪ Explain the user about energy saving tips as described in the
operation manual.
10

Maintenance and service

NOTICE
Maintenance MUST be done by an authorized installer or
service agent.
We recommend performing maintenance at least once a
year. However, applicable legislation might require shorter
maintenance intervals.
ARXM25+35R5V1B RXM20~35R5V1B
R32 Split Series
4P519439-8H – 2020.07
NOTICE
Applicable legislation on fluorinated greenhouse gases
requires that the refrigerant charge of the unit is indicated
both in weight and CO
2
Formula to calculate the quantity in CO
tonnes: GWP value of the refrigerant × total refrigerant
charge [in kg] / 1000
10.1 Overview: Maintenance and
service
This chapter contains information about:

▪ Maintenance safety precautions

▪ The yearly maintenance of the outdoor unit
10.2 Maintenance safety precautions
DANGER: RISK OF ELECTROCUTION
DANGER: RISK OF BURNING/SCALDING
NOTICE: Risk of electrostatic discharge
Before performing any maintenance or service work, touch
a metal part of the unit in order to eliminate static electricity
and to protect the PCB.
WARNING
▪ 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.
10.3 Checklist for yearly maintenance
of the outdoor unit
Check the following at least once a year:
▪ Heat exchanger
The heat exchanger of the outdoor unit can get blocked up due to
dust, dirt, leaves, etc. It is recommended to clean the heat
exchanger yearly. A blocked heat exchanger can lead to too low
pressure or too high pressure leading to worse performance.
11

Troubleshooting

11.1

Overview: Troubleshooting

This chapter describes what you have to do in case of problems.
It contains information about solving problems based on symptoms.
Before troubleshooting
Carry out a thorough visual inspection of the unit and look for
obvious defects such as loose connections or defective wiring.
8 Configuration
equivalent.
equivalent
2
Installer reference guide
21