External Factors; Checking Procedures - Daikin VRV IV+ Service Manual

4 Third party components
4 Activate refrigerant recovery / vacuum mode by setting field
setting mode 2-21 to 1 (see
To make sure that refrigerant cycle is completely connected and
there are no dead-zones because of closed expansion- or solenoid
valves, entering the refrigerant recovery / vacuum mode ensures
that:
▪ All indoor unit expansion valves get fully opened,
▪ all outdoor unit expansion valves get fully opened,
▪ the necessary solenoid valves get fully opened.
5 To add refrigerant, see "4.2.2 Repair procedures" on
Is the problem solved?
Yes
No
To add refrigerant
1 See the installer reference guide for the correct procedure.
Is the problem solved?
Yes
No
To adjust the refrigerant field piping
1 Make sure that the refrigerant field piping is conform with the
regulations. See installation
specifications.
Is the problem solved?
Yes
No
Repair information
Refrigerant piping handling
▪ Make sure that the applied pressure is never higher than the unit
design pressure indicated on the nameplate (PS).
▪ Work according to the F‑gas regulation and/or local regulations.
▪ Make sure the correct amount of refrigerant is charged after repair
according to the F‑gas regulation label on the unit (factory +
additional where required).
▪ Make sure to use the appropriate equipment and tools according
to the refrigerant and unit type.
▪ Charge non‑azeotropic refrigerant (e.g. R410A) always in a liquid
state.
▪ Make sure to use a digital scale (no charging cylinder).
▪ Execute correct vacuum drying procedure after repair:
▪ –0.1 MPa / –760 mm Hg / –750 Torr / –1 bar for at least 1 hour.
▪ Connect the unit according to the available service ports.
▪ Use related field setting where necessary to open expansion
valve / solenoid valve.
Refrigerant piping repair
▪ Make sure to cover open pipe ends during repair so no dust or
moisture can enter.
▪ Make sure to re‑apply insulation removed during repair.
Service manual
138
https://daikin-p.ru/catalog/vrv-daikn/naruzhnye-vrv-bloki-daikin
"6.9 Field settings" on page 188).
page 136.
Action
No further actions required.
Return to the troubleshooting of
the specific error and continue
with the next procedure.
Action
No further actions required.
Perform a pressure test of the
refrigerant circuit, see
"4.2.1 Checking procedures" on
page 133.
manual for field piping
Action
No further actions required.
Return to the troubleshooting of
the specific error and continue
with the next procedure.
▪ Pipe expansion / flare making:
▪ Remove any burrs on the cut surface using the correct tool
such as reamer or scraper (note that excessive deburring can
thin the pipe walls and cause cracking of the pipe).
▪ Make sure the flare has the correct size (use a flare gauge).
▪ Make sure no particles remain in the piping.
▪ Apply just a drop of refrigerant oil on the inner surface of the
flare.
▪ Make sure the flare connection is tightened with the correct
torque (torque values refer to installation manual).
▪ Brazing:
▪ Use the correct brazing tool.
▪ Use a phosphor copper filler metal (silver composition of 0 to
2%). Do not use flux material.
▪ Flush the piping before brazing with nitrogen to avoid oxidation
of the inside of the copper tubes (nitrogen purity ≥99.99%).
Additional refrigerant charge amount
1 Once automatic or manual additional refrigerant charge is
completed, it is necessary to give input to the outdoor unit over
the total additional refrigerant charge amount.
2 Set field setting 2–14 according to the table below. See
"6.9 Field settings" on page 188.
Mode R410A Mode
2-14 [kg] 2-14
0 No input 7
1 0~5 8
2 5~10 9
3 10~15 10
4 15~20 11
5 20~25 12
6 25~30 13
3 Even though they can be selected, 2-14 settings 19, 20, and 21
CANNOT be set.
4 Default setting is 0. If set to 0, refrigerant leak check function
will NOT be available.
5 If set to 0 and field setting 2-88=0, at the end of the test-run
error code U3-02 will indicate that refrigerant leak check
function will NOT be available.
4.3

External factors

4.3.1

Checking procedures

To check the outdoor temperature
1 The temperature ranges for the different operation modes of the
unit can be found in the databook on Business Portal.
INFORMATION
If the outdoor temperature is outside the range of
operation, the unit may NOT operate or may NOT deliver
the required capacity.
INFORMATION
If difference between the ambient temperature and
temperature at air inlet of the outdoor unit heat exchanger
is >5 K, consider mounting an air guide at the air discharge
outlet of the outdoor unit heat exchanger.
R410A Mode R410A
[kg] 2-14 [kg]
30~35 14 65~70
35~40 15 70~75
40~45 16 75~80
45~50 17 80~85
50~55 18 85~90
55~60
60~65
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07