About Service Mode Operation; To Use Vacuum Mode; To Recover Refrigerant; Troubleshooting - Daikin RXYTQ8T7YF Installer And User Manual

Pay attention to the fan. It is dangerous to inspect the unit while the
fan is running. Make sure to turn off the main switch and to remove
the fuses from the control circuit located in the outdoor unit.
9.3

About service mode operation

Refrigerant recovery operation/vacuuming operation is possible by
applying setting [2‑21]. Refer to
page 31 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.
9.3.1

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.
9.3.2

To recover refrigerant

This should be done by a refrigerant reclaimer. Follow the same
procedure as for vacuuming method.
NOTICE
Make sure to NOT recover any oil while recovering
refrigerant. Example: By using an oil separator.
10.3

Error codes: Overview

Main code
Master

RXYTQ8~16T7YF

VRV IV system air conditioner
4P388989-1B – 2016.02
"7.2 Making field settings" on
(external control) and
Sub code
Slave 1 Slave 2
Earth leakage detector activated
High pressure switch was activated
(S1PH, S2PH) - A1P (X3A; X4A)
▪ Refrigerant overcharge
▪ Stop valve closed
Stop valve closed (liquid)
▪ Refrigerant overcharge
▪ Stop valve closed
Low pressure malfunction:
▪ Stop valve closed
▪ Refrigerant shortage
▪ Indoor unit malfunction
Electronic expansion valve malfunction
(subcool) (Y2E) - A1P (X21A)
Electronic expansion valve malfunction
(main) (Y1E) - A1P (X23A)
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.
Cause
Restart the unit. If problem reoccurs,
contact your dealer.
Check stop valve situation or
abnormalities in (field) piping or airflow
over air cooled coil.
▪ Check refrigerant amount+recharge
unit.
▪ Open stop valves
Open liquid stop valve.
▪ Check refrigerant amount+recharge
unit.
▪ Open stop valves.
▪ Open stop valves.
▪ Check refrigerant amount+recharge
unit.
▪ Check the user interface's display or
transmission wiring between the
outdoor unit and the indoor unit.
Check connection on PCB or actuator.
Check connection on PCB or actuator.
10 Troubleshooting
Example
Solution
Installer and user reference guide
41