Charging Refrigerant - Daikin RZQ71B7V3B Installation Manual

3 Conduct leak test by applying soap water, etc. to the connecting
part of the pipes.
4 Discharge nitrogen.
5 Evacuate and check vacuum again
6 If the vacuum gauge no longer rises, the stop valves can be
opened.
Following should be executed if there is a possibility of
moisture remaining in the pipe (if piping work is carried out
during the raining season or over a long period of time,
rainwater may enter the pipe during work).
After evacuating the system for 2 hours, pressurize the
system to 0.05 MPa (vacuum break) with nitrogen gas and
evacuate the system again using the vacuum pump for
1 hour to –100.7 kPa (vacuum drying). If the system
cannot be evacuated to –100.7 kPa within 2 hours, repeat
the operation of vacuum break and vacuum drying. Then
after leaving the system in vacuum for 1 hour, confirm that
the vacuum gauge does not rise.
C
HARGING REFRIGERANT
Precaution for servicing
When performing service on the unit requiring the
refrigerant system to be opened, refrigerant must be
evacuated according to local regulations.
This unit requires additional charging of refrigerant according to the
length of pipe connected at the site. Charge the refrigerant to the
liquid pipe in its liquid state. Since R-410A is a mixed refrigerant, its
composition changes if charged in a state of gas and normal system
operation would no longer be assured.
On this model it is not necessary to charge additionaly if the piping
length ≤30 m.
<5 m: See "Total charging weight of the refrigerant (after a leak, etc.)"
on page 10.
Additional charging of refrigerant
The additional charging amounts relate to the refrigerant piping
length as in "Maximum total one-way piping length"
in paragraph "Allowable pipe length and height difference" on
page 5. (E.g. twin: L1+L2+L3).
Over 30 m, please add refrigerant quantity according to
following table.
For future servicing, mark with a circle the selected amount on the
tables below
For pair system
Table 1: Additional charging of refrigerant <unit: kg>
Connected piping length is between
Model 30~40 m
RZQ71
0.5
RZQ100+125
Connected piping length is between
Model 15~20 m
RZQ71
0.5
RZQ100+125
Installation manual
9
(1)
.
of the table
Standard liquid pipe size
40~50 m 50~60 m 60~75 m
—
1.0
1.5 2.0
Size up liquid pipe size
20~25 m 25~30 m 30~35 m
—
1.0
1.5 2.0
For twin, triple, and double twin system
Please charge additionaly according to the following calculation.
(additional amount is R1+R2)
1. G1: total length of 9.5 mm liquid piping
Ø
G2: total length of 6.4 mm liquid piping
Ø
2.a G1>30 m
calculate length over 30 m (=G1–30 m)
Based on this length decide R1, R2 in the table
b G1≤30 m and G1+G2>30 m
calculate total length over
Based on this decide R2 in the table, R1=0
3. Total additional charge amount
R=R1+R2 (kg)
Table 2: Length <unit: m>, additional charging of refrigerant
<unit: kg>
Liquid
Model piping Ø
Main
9.5
RZQ71~125 Branch
Branch 6.4
Example 1
L1=35 (Ø9.5)
100 type
outdoor heat pump
1 G1=L1=35 m
30
2 Over m
a G1 – 30=5 m
b G2=12 m
3 Refrigerant charge amount=R=R1+R2=0.5+0.6=1.1 kg
Example 2
L1=5 (Ø9.5)
125 type
outdoor heat pump
1 G1=L1=5 m
2 Over 30 m
a G1=5 m
–
b (G1+G2) 30=(5+54)
3 Refrigerant charge amount=R=R1+R2=0.0+0.9=0.9 kg
In case of complete recharge of the refrigerant, please first
execute vacuuming. Execute this vacuuming from the
service port. Do not use the port of the stop valve for
vacuuming. Vacuuming can not be executed completely
using such port.
Position of service port:
Heat pump: Heat pump units have 2 ports on the
piping. One between the liquid receiver and the
electronic expansion valve and another one between
the heat exchanger and the 4-way valve.
30 m (=G1+G2–30 m)
Length exceeding "Chargeless length"
0~10 10~20 20~30 30~40 40~55
0.5 1.0 1.5 2.0
0.3 0.6 0.9 1.2
L2=7 (Ø6.4)
50 type
indoor
L3=5 (Ø6.4)
50 type
G2=L2+L3=7+5=12
Ø9.5 R1=0.5 kg
Ø6.4 R2=0.6 kg
L2=17 (Ø6.4)
50 type
indoor
L3=17 (Ø6.4)
50 type
indoor
L4=20 (Ø6.4)
50 type
G2=L2+L3+L4=17+17+20=54
R1=0.0 kg
–
30=29 Ø6.4 R2=0.9 kg
RZQ71~125B7V3B
Split System air conditioners
4PW16864-1A
2.5 R1
1.5 R2