Daikin RXYQ6BRY16 Installation Manual page 46

14.3.2 Charging method
As explained during vacuum drying method, once vacuum
drying is finished, additional refrigerant charging can start.
There are three methods to charge additional refrigerant.
Use the selected method following the described
procedure below.
Adding refrigerant by using the automatic refrigerant
•
charging function with test run in a same time.
Adding refrigerant by using the automatic refrigerant
•
charging function without test run.
Adding refrigerant by using the manual refrigerant
•
charging function.
A flow chart is available which gives an overview of the
possibilities and actions to be taken (see "14.3.1 Flow
chart").
To speed up the process of pre-charging refrigerant for
large systems, it is recommenced to first charge a
portion of the refrigerant before performing charging.
This step is included in below procedure. This step can
be skipped, charging will take longer in such a case.
Follow the steps as described below.
1
Calculate the additional amount of refrigerant to
be added using the formula mentioned in "14.2
Calculating the additional refrigerant charge".
2 Select additional refrigerant charge function A or B
or C.
A/B Perform Automatic refrigerant charge function.
3AB Check the additional refrigerant amount R (kg)
Total additional refrigerant is 4 kg or less
•
(R ≤ 4 kg) perform the automatic refrigerant
charging procedure as explained in step 5A.
Total additional refrigerant amount more than
•
4 kg (R > 4 kg) perform the pre-charging
procedure as explained in step 4AB.
4AB The first 50% (±10%) of additional refrigerant
can be charged without outdoor unit operation.
INFORMATION
The refrigerant additional amount (R)
can be charge more than 50% (±10%) if;
Then the refrigerant pre-charging
amount Q'(kg) can be calculate refer to
the following formula below.
When Q'= R efrigerant pre-charging
Pre-charging can be done without
•
compressor running by connecting the
refrigerant bottle only to the liquid stop valve
service port (open valve B). Make sure that
the stop valves are closed (valve C and
valve A+gas stop valve)
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01_EN_3P748230-1.indd 44
[R-(6 x n)] > R/2.
Q'=R-(6 x n)
amount (kg)
n = n umber of the outdoor units
Location of valves
6
9
1
8
7
A
4
B
2 3 5
C
1 Gauge manifold
2 Dry Nitrogen
3 Measuring instrument
4 Refrigerant R410A tank (siphon system)
5 Vacuum pump
6 Charge hose
7 Gas stop valve
8 Liquid stop valve
9 Refrigerant automatic charge valve (needle valve)
10 Valve
11 Field piping
12 Gas flow
13 Stop valve service port
A Valve A
B Valve B
C Valve C
INFORMATION
If the total additional refrigerant amount was
reached in step 4AB (by pre-charging only),
record the amount of refrigerant that was added
on the additional refrigerant charge label
provided with the unit and attach it on the back
side of the front panel.
Perform the test procedure as described in
"16.1 Test operation".
After pre-charging, perform the refrigerant charge
•
operation (with or without test run) through valve C.
Open the liquid and gas stop valves.
Valves A and B and C must remain closed!
INFORMATION
For a multi outdoor unit system, it is not required
to connect all charge ports to a refrigerant tank.
The refrigerant will be charged with 26 kg in
1 hour time an outdoor temperature of 30°C DB or
with 18 kg at an outdoor temperature of 0°C DB.
If you need to speed up in case of a multiple
outdoor system, connect the refrigerant tanks to
each outdoor unit.
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