Advertisement
INSTALLATION
5. INSTALLATION
5.1 Installation Using the Existing Refrigerant
Piping
DANGER
• Use non-flammable and non-toxic cleaning agent for cleaning
the piping. Flammable cleaning agent may cause an explosion
or a fire.
• Open the window for ventilation during the installation. If not,
it may result in an oxygen shortage.
• Make sure that cleaning agent does not contact fire or reach a
high temperature, as toxic gas will generate.
NOTE
• Make sure to collect cleaning agent after cleaning the piping. It
is strictly prohibited to release Fluorocarbons into the atmos-
phere without any reason.
• During heating operation, the maximum pressure on the existing
piping must be less than the allowable pressure (3.6MPa). When
using the existing piping with a diameter of Ø19.05, therefore,
set No.4 pin of DSW2 on outdoor unit PCB to "ON" to keep the
maximum pressure on the piping less than 3.6MPa.
By using this Renewal Kit TRF-NP Series, the existing
piping can be used for a new air conditioner without
cleaning the piping under the following conditions.
Conditions for using the existing refrigerant piping
1. The total length of the existing refrigerant piping shall
be up to 50m.
2. The new UTOPIA Series air conditioner to be installed
shall be for 12HP or less.
3. Make sure to check that there are no scratches and
dents on the surface of the existing refrigerant pipe
nor smudges inside the pipe.
4. The flare nut and the piping diameter shall be based
on JIS (Japanese Industrial Standards). The thickness
of copper pipe is indicated in the table below.
5. Perform the flaring work of the existing refrigerant
piping again before installation.
6. Make sure to conduct an air-tight test and vacuuming
of the piping.
Copper pipe thickness (mm)
Diameter
(Ød)
6.35
9.52
12.7
15.88
19.05
22.2
25.4
28.58
EN
PMEN0523 rev.0 - 02/2023 - A16381TTVF
Thickness
Material
0.8
O Material
0.8
O Material
0.8
O Material
1.0
O Material
1.0
O Material
1.2
O Material
1.0
1/2H Material
1.0
1/2H Material
NOTE
• The fluorocarbons must be collected when removing the old air
conditioner.
• If the total length of the existing piping is over 50m, the renewal
kit cannot be used. However, if cleaning work of the existing
refrigerant piping is carried out, the existing refrigerant piping is
available without renewal kit.
For using the piping made by other companies
The existing refrigerant piping of air conditioner made
by other companies can be used for a new HITACHI air
conditioner only if complying with the item "Conditions
for Using the Existing Refrigerant Piping" and the follow-
ing points.
1. Use the branch piping (for 410A) specified by
HITACHI. If using the branch piping made by other
companies, make sure to check the followings.
a. The allowable pressure shall be 3.6MPa or more.
b. Set No.4 pin of DSW2 on outdoor unit PCB to
"ON." (This is not required if the allowable pres-
sure of the branch piping is 4.15MPa or more.)
c. Y-shaped branches shall be adopted for branch
pipes.
2. If the system for the existing air conditioner is Gas
Heat Pump System, clean the existing refrigerant pip-
ing before installation.
5.2 Mounting Position
Refer to Installation & Maintenance Manual of each
Outdoor Unit for details.
◆ Recommended renewal kit
A: External attachment to outdoor unit [Short pipe (local) + Kit +
existing piping]
B: Internal attachment to outdoor unit [Kit + existing piping]
IVX Premium
RAS-(2/2.5)HVNP(1)
TRF-NP63S1
RAS-3HVNP(1)E
TRF-NP160S1
RAS-(4-6)H(V)NP(1/2)E
(TRF-NP160S1)
RAS-8HNPE
RAS-(10/12)HNP(E)
RAS-(3-6)H(V)NC(1/2)(E)
TRF-NP160S1
RAS-8HNCE
RAS-(10/12)HNC(E)
NOTE
Take care when deciding the mounting direction.
A
B
TRF-NP160U1
TRF-NP280U1
TRF-NP335U2
TRF-NP280U1
TRF-NP335U2
4
Advertisement
