Daikin VRV IV+ Service Manual page 372

4 | Third party components
Additional refrigerant charge amount
4.3 External factors
4.3.1 Checking procedures
To check the outdoor temperature
Service manual
372
▪ 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%).
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
4
settings" [ 455].
Mode 2-14 R410A [kg]
0 No input
1 0~5
2 5~10
3 10~15
4 15~20
5 20~25
6 25~30
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.
1 The temperature ranges for the different operation modes of the unit can be
found in the databook on Business Portal.
Mode 2-14 R410A [kg]
7 30~35
8 35~40
9 40~45
10 45~50
11 50~55
12 55~60
13 60~65
"6.9 Field
Mode 2-14 R410A [kg]
14 65~70
15 70~75
16 75~80
17 80~85
18 85~90
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05