Installation manual
19
20B7Y1R
Air cooled refrigeration condensing unit
4P360438-1B – 2014.01
10. REFRIGERANT REPLENISHMENT
For refrigerant filling contractor
Only use refrigerant R410A.
The R410A refrigerant cylinder is painted with a pink belt.
WARNING
• Use protective gear (e.g., protective gloves and glasses) at the
time of refrigerant filling.
• Pay attention to the rotation of the fan whenever the front panel is
opened while working.
The fan can rotate continuously for a while after the outdoor unit
stops operating.
[Refrigerant replenishment work]
How to calculate the additional refrigerant to be charged.
Enter the blanks in the table below:
CAUTION
• The total maximum refrigerant charge of a Multi-ZEAS system
must be less than 100 kg, this to be in accordance with CE
requirements (EN603350-2-40 standard). This means that in case
the calculated total refrigerant charge is equal to or more than
95 kg you must divide your multiple outdoor system into smaller
independent systems, each containing less than 95 kg refrigerant
charge.
• Refer to the
"Operation Method of Shutoff Valves" on page 9
control method of the shutoff valves.
• Never replenish liquid refrigerant directly from a gas line. Liquid
compression and overheating may cause the compressor to fail.
1. The refrigerant must be noted for this product. Calculate the amount
of refrigerant replenishment according to the label for the calcula-
tion of the amount of refrigerant replenishment.
2. Take the following procedure for refrigerant replenishment.
Refer to
"8-1 Airtight test/refrigerant oil charging/vacuum drying"
for the connection of the refrigerant cylinder.
3. Turn on the indoor unit and control panel.
Do not turn on the outdoor unit.
4. Replenish refrigerant from the service port of the shutoff valve on
the liquid side.
5. If the refrigerant is charged while the compressor is running, set
the target evaporating temperature to
≥
–25°C. Make sure the
master unit is properly designated. Refer to
.
6. If the calculated amount of refrigerant cannot be filled, take the
following steps to operate the system and continue refrigerant
replenishment.
a. Open the gas shutoff valve all the way and adjust the opening of
the liquid shutoff valve (*1).
b.
[Warning/electric shock warning]
Turn on the outdoor unit.
c.
[Warning/electric shock warning]
Turn on the operation switch of the outdoor unit and replenish
refrigerant while the outdoor unit is in operation.
d.Turn off the operation switch of the outdoor unit after the speci-
fied amount of refrigerant is replenished. (To prevent liquid
compression)
e.
[Caution]
Fully open the shutoff valves on the gas and liquid sides
promptly. Otherwise, a piping explosion may result from liquid
sealing.
Label pasting position:
z
1
Master unit
2
Additional refrigerant charge label
3
Additional refrigerant oil label
4
Frontside view of electric component box cover
5
Backside view of the electric component box cover
*1The cylinder’s internal pressure will drop when there is little
refrigerant remaining in the cylinder, making it impossible to charge
the unit, even if the liquid shutoff valve opening is adjusted. In this
situation, replace the cylinder with one that has more refrigerant
remaining.
Additionally, if the piping length is long, replenishing while the liquid
shutoff valve is fully closed may lead to activation of the protection
system, causing the unit to stop operation.
7. After the work is completed, apply a screw lock agent (for flare
nuts) to the screws of the shutoff valves and service ports. Refer to
the
"Handling precautions for valve cover" on page 10
and
"Handling Precautions for Service Port" on page 10
4 Connecting the refrigerant piping" on page 8
for the handling of
the valve covers and service ports.
8. After the refrigerant replenishment is completed, fill out the item
“total amount of refrigerant replenishment” on the label of
instructions on refrigerant replenishment of the outdoor unit with
the actual amount of refrigerant replenishment.
Refer to the illustration of the label pasting position for instructions
on refrigerant replenishment (see the illustration on the above).
Fixed additional refrigerant amount
7 kg
Indoor
unit
Blower
coil
Total internal volume
Weight factor
(kg/l)
Subtotal (kg)
l ×
0.24
=
(
A
)
Show
case
Total capacity
Weight factor
(kg/kW)
Subtotal (kg)
kW ×
0.23
(TE
≥
–20°C)
=
(
B
)
×
0.35
(TE<–20°C)
=
(
C
)
Sum
(
A
+
B+C
) =
kg
Liquid
piping
Piping
diameter
(mm)
Piping
length (m)
Volume
factor
(kg/m)
Subtotal (kg)
Ø6.4
×
0.02
=
(
D
)
Ø9.5
×
0.06
=
(
E
)
Ø12.7
×
0.12
=
(
F
)
Ø15.9
×
0.19
=
(
G
)
Ø19.1
×
0.29
=
(
H
)
Sum (
D
+
E
+
F
+
G
+
H
) =
kg
Adjustment < (
+
+
)×0.1
a
a.Adjustment (when the sight glass indicates a refrigerant shortage)
When test running, add refrigerant if the sight glass is not in a sealed state
during cooling operation.
=
kg
The amount of additional refrigerant in field (
+
+
+
)
(should be rounded off in units of 0.1 kg).
=
kg
The amount of initially charged refrigerant.
b
b.The amount of initially charged refrigerant in both master and slave unit.
23 kg
The total amount of refrigerant
(
+23) =
kg
A little
foam
flows.
Foam always
comes out.
Full of
liquid.
Sealing state
Refrigerant insufficiency
1
4
5
2
3
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