Installation manual
17
REMQ8~16P7Y1B
VRVIII System air conditioner
4PW37156-1
11. C
HARGING
REFRIGERANT
The outdoor unit is factory charged, but depending on the length of
the piping when installed, the outdoor unit may require additional
charging.
For charging the additional refrigerant follow the procedure as
described in this chapter.
11.1. Important information regarding the
refrigerant used
This product contains fluorinated greenhouse gases covered by the
Kyoto Protocol. Do not vent gases into the atmosphere.
Refrigerant type:
R410A
GWP
(1)
value:
1975
(1)
GWP = global warming potential
Please fill in with indelible ink,
■
➀
the factory refrigerant charge of the product,
■
➁
the additional refrigerant amount charged in the field and
■
➀
+
➁
the total refrigerant charge
on the refrigerant charge label supplied with the product.
The filled out label must be adhered in the proximity of the product
charging port (e.g. onto the inside of the service cover).
(2)
In case of multiple outdoor systems, only 1 label must be adhered,
mentioning the total factory refrigerant charge of all outdoor units
connected on the refrigerant system.
11.2. Precautions when adding R410A
Be sure to charge the specified amount of refrigerant in liquid state to
the liquid pipe.
Since this refrigerant is a mixed refrigerant, adding it in gas form may
cause the refrigerant composition to change, preventing normal
operation.
■
Before charging, check whether the refrigerant cylinder is
equipped with a siphon tube or not.
■
Be sure to use tools exclusively for R410A to ensure required
pressure resistance and to prevent foreign materials from mixing
into the system.
11.3. Stop valve operation procedure
Size of stop valve
The sizes of the stop valves connected to the system are as listed in
the table below.
Opening stop valve
1.
Remove the cap and turn the valve counterclockwise with the
hexagon wrench.
2.
Turn it until the shaft stops.
3.
Make sure to tighten the cap securely. Refer to the table below
Closing stop valve
1.
Remove the cap and turn the valve clockwise with the hexagon
wrench.
2.
Securely tighten the valve until the shaft contacts the main body
seal.
3.
Make sure to tighten the cap securely.
For the tightening torque, refer to the table above.
Refrigerant cannot be charged until all field wiring and field
piping has been completed.
Refrigerant may only be charged after performing the leak
test and the vacuum drying.
The refrigerant charge of the system must be less than
100 kg. This means that in case the calculated 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.
For factory charge, refer to the unit name plate.
Charge the liquid
refrigerant with the
cylinder in upright
position.
Charge the liquid
refrigerant with the
cylinder in up-side-down
position.
3
5
6
2
1
4
1
factory refrigerant charge
of the product:
see unit name plate
(2)
2
additional refrigerant
amount charged in the
field
3
total refrigerant charge
4
contains fluorinated
greenhouse gases
covered by the Kyoto
Protocol
5
outdoor unit
6
refrigerant cylinder and
manifold for charging
Charging with an unsuitable substance may cause
explosions and accidents, so always make sure that the
appropriate refrigerant (R410A) is charged.
Refrigerant containers must be opened slowly.
Type of stop valve
8 Hp
10 Hp
12 Hp
14 Hp
16 Hp
Liquid pipe
Ø9.5
(a)
(a) The 12 Hp model supports field piping of Ø12.7 on the accessory pipe supplied
with the unit.
Ø12.7
Suction gas pipe
Ø25.4
(b)
(b) The 8 and 10 Hp models support field piping of Ø22.2 on the accessory pipe
supplied with the unit.
The 12~16 Hp models support field piping of Ø28.6 on the accessory pipe
supplied with the unit.
HP/LP gas pipe
Ø19.1
(c)
(c) The 14 and 16 Hp models support field piping of Ø22.2 on the accessory pipe
supplied with the unit.
Equalizer pipe
Ø19.1
■
Do not open the stop valve until all piping and
electrical steps of
installation conditions" on page 16
the stop valve is left open without turning on the
power, it may cause refrigerant to build up in the
compressor, leading to insulation degradation.
■
Always use a charge hose for service port connection.
■
After tightening the cap, check that no refrigerant
leaks are present.
1
Service port
2
Cap
3
Hexagon hole
4
Shaft
5
Seal
Do not apply excessive force to the stop valve. Doing
so may break the valve body.
Stop valve size
Tightening torque N•m (Turn clockwise to close)
Shaft
Cap (valve lid)
Service port
Valve body
Hexagonal
wrench
Ø9.5
5.4~6.6
4 mm
13.5~16.5
11.5~13.9
Ø12.7
8.1~9.9
18.0~22.0
Ø22.2
27.0~33.0
8 mm
22.5~27.5
Ø25.4
