Installation manual
19
LREQ5~20B7Y1
Air cooled refrigeration condensing unit
4PW74302-1D – 2016.11
12. ADDITIONAL REFRIGERANT AMOUNT
12-1 Calculation method
This product must fill the refrigerant in the field.
Calculate the amount of refrigerant replenishment according
to the following points and note the amount of the refrigerant
in the list shown below.
1
The amount of the refrigerant for the liquid piping is calculated
from the liquid piping size and the piping length of the system.
(Calculate the refrigerant additional charging quantity by rounding
off to the number in 0.1 kg.)
2
Total each piping size amount of the refrigerant.---(1)
3
The amount of the refrigerant for the indoor unit of the refrigeration
is calculated from the capacity of the connected showcase as
below table 1).
1. Total all the refrigeration showcase capacities.
2. Total all the freezer showcase capacities.
3. Total all the blower coil capacities.
4. Calculate the amount of the refrigerant by the total capacities
and the table 1 below of each indoor unit.
4
Total each indoor unit amount of the refrigerant.---(2)
5
Add a constant amount depending on outdoor unit capacity class
(see table 2).---(3)
6
Total the amount of the refrigerant of table below(1), (2), and (3).
---(4)
7
Check sealing conditions through the sight glass at the time of test
run(see Figure 1).
If the sight glass has not been sealed yet (due to the shortage of
refrigerant), charge additional refrigerant.---(5)
Note
The upper limit quantity of refrigerant adjustment at the time of
the test run assumes 0.1 times of the quantity of refrigerant cal-
culated based on piping length(1), on indoor unit capacity(2)
and outdoor unit capacity class (3).
(5)≤(4)×0.1
8
Calculate the total additional charging amount.---(6)
9
Determine the factory charge (see table 3).---(7)
10 Calculate the amount of all refrigerant in this system.---(8)
Table 1: Capacity and amount of refrigerant of the indoor unit (Show-
case and Blower coil)
Note
1.Case of showcase, the condition of capacity
(evaporating temperature).
Refrigeration:-10°C
Frozen:-35°C
2.Case of blower coil, the condition of capacity is 10°C (Td).
Table 2: Additional reftigerant amount based on outdoor unit
capacity class
Figure 1
Table 3: Factory charge
Inch piping
Metric piping
Liquid
pipe size
Refri-
gerant
amount
Liquid
pipe size
Refri-
gerant
amount
Pipe
length
(m)
Total
amount
of refri-
gerant
(kg)
Ø6.4
0.02
Ø6.0
0.018
(a)
Ø9.5
0.06
Ø10.0
0.066
(b)
Ø12.7
0.12
Ø12.0
0.097
(c)
Ø15.9
0.19
Ø16.0
0.19
(d)
(1) Subtotal [(a)+(b)+(c)+(d)]
Indoor unit
Total
capacity
(kW)
Amount of
refrigerant
(Refer to
table 1)
Refrigeration showcase
(A)
Frozen showcase
(B)
Blower coil
(C)
(2) Subtotal [(A)+(B)+(C)]
(3) Constant amount based on outdoor unit
capacity class (table 2)
(4) Total of the amount of refrigerant
replenishment [(1)+(2)+(3)]
(5) Amount of refrigerant replenishment at the time
of test run.
(6) Total additional charging amount [(4)+(5)]
(7) Factory charge (table 3)
(8) Total amount of refrigerant [(6)+(7)]
Total capacity of showcase or
blower coil
(*Note.)
Amount of refrigerant (kg)
Showcase
Blower coil
Refrigeration
Frozen
Less than 5kW
1.1
1.4
0.6
From 5kW to less than 10kW
2.3
3.2
1.2
From 10kW to less than 15kW
3.4
5.2
1.7
From 15kW to less than 20kW
4.6
—
2.3
From 20kW to less than 25kW
5.9
—
3.0
From 25kW to less than 30kW
7.0
—
3.5
From 30kW to less than 35kW
8.2
—
4.1
From 35kW to less than 40kW
9.7
—
4.9
40kW or more
11.0
—
5.5
Outdoor unit
Amount of refrigerant (kg)
LREQ(5/6)B7Y1
1.0
LREQ(8/10/12)B7Y1
3.0
LREQ(15/20)B7Y1
3.5
Outdoor unit
Factory charge (kg)
LREQ(5/6)B7Y1
5.2
LREQ(8/10/12)B7Y1
7.9
LREQ(15/20)B7Y1
11.5
Outdoor unit
Blower coil
Booster unit
Refrigeration
showcase
Frozen
showcase
Full of
liquid
Bubbles come
out at all times.
A few
bubbles
flow.
Sealed state ( )
Shortage of refrigerant ( )
4PWEN74302-1D.book Page 19 Thursday, April 27, 2017 9:01 PM
