Daikin VRV 5-S Series - To Check for Refrigerant Leaks after Charging; To Insulate the Refrigerant Piping

19 | Charging refrigerant
Installer and user reference guide
103
RXYSA4~6A7V/Y1B
VRV 5-S system air conditioner
4P600330-1D – 2023.02
NOTICE
Applicable legislation on fluorinated greenhouse gases requires that the refrigerant
charge of the unit is indicated both in weight and CO
2
equivalent.
Formula to calculate the quantity in CO
2
equivalent tonnes: GWP value of the
refrigerant × total refrigerant charge [in kg] / 1000
Use the GWP value mentioned on the refrigerant charge label.
2 Fix the label on the inside of the outdoor unit. There is a dedicated place for it
on the wiring diagram label.
19.8 To check for refrigerant leaks after charging
All field made refrigerant joints must be tested for tightness.
No leak shall be detected with a test method that has a sensitivity of 5 grams
refrigerant per year or better, at a pressure of at least 0.25times the maximum
working pressure (see "PS High" on the unit name plate).
In case a leak is detected
1 Recover the refrigerant and repair the joint(s).
2 Perform the leak tests see "18.3.4To perform a leak test"[494].
3 Charge refrigerant.
4 Check for refrigerant leaks after charging (see above).
19.9 To insulate the refrigerant piping
After finishing the charging procedure, the piping must be insulated. Take into
account the following points:
▪ Make sure to insulate the connection piping and refrigerant branch kits entirely.
▪ Be sure to insulate the liquid and gas piping (for all units).
▪ Use heat resistant polyethylene foam which can withstand a temperature of 70°C
for liquid piping and polyethylene foam which can withstand a temperature of
120°C for gas piping.
▪ Reinforce the insulation on the refrigerant piping according to the installation
environment.
Ambient temperature Humidity Minimum thickness
≤30°C 75% to 80% RH 15mm
>30°C ≥80% RH 20mm
Between outdoor and indoor unit
NOTICE
It is recommended that the refrigerant piping between indoor and outdoor unit is
installed in a ducting or the refrigerant piping is wrapped with finishing tape.
1 Insulate and fix the refrigerant piping and cables as follows: