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PIPING WORK AND REFRIGERANT CHARGE
(1.0 mmHg).
2 Pressurize with nitrogen up to 0.3 MPaG (50 PSIG) for
15 minutes.
3 Release pressure until reaching the atmosphere level, as low
as 0.03 MPaG (5 PSIG).
Step 3
1 Vacuum until the pressure reaches 500 microns (0.5 mmHg).
2 Stop vacuum pump.
8.6 aDDitional refriGerant CHarGe CalCUlation
Although refrigerant has been charged into this unit in advance, additional refrigerant charge is required according to piping length.
Determine the additional refrigerant quantity according to the following procedure, and charge the system with it.
Record the additional refrigerant quantity to facilitate maintenance and servicing activities thereafter.
Calculating method of additional refrigerant charge (W kg)
W1
Additional refrigerant charge calculation for liquid piping (W1 kg)
Pipe diameter (mm)
∅28.58
∅25.40
∅22.20
∅19.05
∅15.88
∅12.70
∅9.52
∅6.35
?
n o t e
In the case that the quantity calculated above is less than the minimum quantity indicated in the table below, adopt the quantity in the table below as
the additional refrigerant quantity for piping liquid, regardless of the piping length.
series
Unit Capacity (HP)
minimum additional refrigerant
Charge of Base Unit (kg)
series
Unit Capacity (HP)
minimum additional refrigerant
Charge of Base Unit (kg)
For combination of the units, adopt the total minimum quantity of each base unit as the minimum additional refrigerant quantity.
W2
Additional refrigerant charge quantity for indoor unit (only for heat pump system) (W2 kg)
The additional refrigerant charge is required depending on the number of connected indoor units. Select the refrigerant quantity from
the following table.
Additional refrigerant charge quantity (kg)
31
PMML0479 rev.4 - 11/2018
total piping length (m)
m
m
m
m
m
m
m
m
Total additional charge for liquid piping =
8,10
12-18 20-24 26-36 38-42 44-48 50-54 56- 60 62-66 68-72 74- 78 80-84 86-90 92-96
2.0
3.0
4.0
6.0
5-10
12,14
16-20
22
2.0
3.0
4.0
5.0
3 Check that the vacuum 500 microns (0.5 mmHG) can
maintain for one hour.
?
n o t e
•
If tool or measuring instruments come into contact with the refrigerant,
use the tools or the measuring instruments exclusively for R410A.
•
Do not perform vacuuming pumping work with valves of the outdoor
units open. Otherwise, the refrigerant charged before shipment may
leak and it may result in failure. If moisture remains inside the pipes,
the compressor may be damaged.
refrigerant amount for 1m pipe (kg/m)
x 0.67 =
x 0.52 =
× 0.36 =
× 0.26 =
× 0.17 =
× 0.11 =
× 0.056 =
× 0.024 =
fsXnse
7.0
8.0
9.0
10.0
fsXnPe
24,26 28-32 34,36 38-42 44,46 48,50 52,54 56,58
6.0
7.0
8.0
9.0
10.0
additional charge (kg)
11.0
12.0
13.0
14.0
60
11.0
12.0
13.0
14.0
15.0
16.0
62
64-72
15.0
16.0
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