About Service Mode Operation - Daikin RWEYQ8T9Y1B Installer And User Manual

1 Connect the piping for circulation of cleaning chemicals to the
inlet piping of the plate heat exchanger.
2 Fill a cleaning solution of 50°C~60°C for a while in the plate
heat exchanger.
3 Circulate for 2~5 hours by using a pump. Time for cleaning
depends on the temperature of the cleaning solution or the
degree of scale accumulation. Therefore, please watch the
change of dirtiness of the cleaning solution to determine the
level of removal of scale.
4 After circulating the cleaning solution, discharge the solution
from the plate heat exchanger.
5 Fill the plate heat exchanger with a solution of 1-2% sodium
hydroxide (NaOH) or sodium bicarbonate (NaHCO
6 Circulate this solution for 15-20 minutes for neutralization
purpose.
7 Rinse the inside of the plate heat exchanger with care using
fresh and clean water.
8 When using any commercially available cleaning agent, check
in advance that such agent has no corrosive features against
stainless steel and copper. Ask the manufacturer of the
cleaning agent for more details.
9 Check if the unit can operate in a normal way.
9.4

About service mode operation

Refrigerant recovery operation/vacuuming operation is possible by
applying setting [2‑21]. Refer to
page 35 for details how to set mode 2.
When vacuuming/recovery mode is used, check very carefully what
should be vacuumed/recovered before starting. See installation
manual of the indoor unit for more information about vacuuming and
recovery.
9.4.1 To use vacuum mode
1 When the unit is at standstill, set the unit in [2‑21]=1.
Result: When confirmed, the indoor and outdoor unit expansion
valves will fully open. At that moment the 7‑segment display
indication= and the user interface of all indoor units
indicate TEST (test operation) and
the operation will be prohibited.
2 Evacuate the system with a vacuum pump.
3 Press BS3 to stop vacuuming mode.
9.4.2 To recover refrigerant
This should be done by a refrigerant reclaimer. Follow the same
procedure as for vacuuming method.
DANGER: RISK OF EXPLOSION
Pump down – Refrigerant leakage. If you want to pump
down the system, and there is a leakage in the refrigerant
circuit:
▪ Do NOT use the unit's automatic pump down function,
with which you can collect all refrigerant from the
system into the outdoor unit. Possible consequence:
Self-combustion and explosion of the compressor
because of air going into the operating compressor.
▪ Use a separate recovery system so that the unit's
compressor does NOT have to operate.
NOTICE
Make sure to NOT recover any oil while recovering
refrigerant. Example: By using an oil separator.
RWEYQ8~14T9V1B + RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1 – 2017.04
).
3
"7.2 Making field settings" on
(external control) and
10 Troubleshooting
10.1 Overview: Troubleshooting
This chapter describes what you have to do in case of problems.
It contains information about:
▪ Solving problems based on error codes
10.2 Solving problems based on error
codes
In case of a displayed malfunction code, perform correcting actions
as explained in the malfunction code table.
After correcting the abnormality, press BS3 to reset the malfunction
code and retry operation.
The malfunction code which is displayed on the outdoor unit will
indicate a main malfunction code and a sub code. The sub code
indicates more detailed information about the malfunction code. The
malfunction code will be displayed intermittent.
Example:
Code
Main code
Sub code
With an interval of 1 second, the display will switch between main
code and sub code.
11 Disposal
NOTICE
Do not try to dismantle the system yourself: the dismantling
of the system, treatment of the refrigerant, oil and other
parts must comply with applicable legislation. Units must
be treated at a specialised treatment facility for reuse,
recycling and recovery.
12 Technical data
▪ A subset of the latest technical data is available on the regional
Daikin website (publicly accessible).
▪ The full set of latest technical data is available on the Daikin
extranet (authentication required).
12.1 Overview: Technical data
This chapter contains information about:
▪ Service space
▪ Piping diagram
▪ Wiring diagram
12.2 Service space: Outdoor unit
Make sure the space around the unit is adequate for servicing and
the minimum space for ventilation is available (refer to the figure
below).
10 Troubleshooting
Example
Installer and user reference guide
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