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5 Installation
▪ Insulation. Insulate the refrigerant piping on the indoor unit as
follows:
A
a
b
c
1
B
A
A
Gas piping
B
Liquid piping
a
Insulation material (field supply)
b
Tie wrap (accessory)
c
Insulation pieces: Large (gas pipe), small (liquid pipe)
(accessories)
d
Flare nut (attached to the unit)
e
Refrigerant pipe connection (attached to the unit)
f
Unit
g
Sealing pads: Medium 1 (gas pipe), medium 2 (liquid
pipe) (accessories)
1
Turn up the seams of the insulation pieces.
2
Attach to the base of the unit.
3
Tighten the tie wraps on the insulation pieces.
4
Wrap the sealing pad from the base of the unit to the top
of the flare nut.
NOTICE
Make sure to insulate all refrigerant piping. Any exposed
piping might cause condensation.
5.2.2
To check for leaks
NOTICE
Do NOT exceed the unit's maximum working pressure (see
"PS High" on the unit name plate).
NOTICE
ALWAYS use a recommended bubble test solution from
your wholesaler.
NEVER use soap water:
▪ Soap water may cause cracking of components, such
as flare nuts or stop valve caps.
▪ Soap water may contain salt, which absorbs moisture
that will freeze when the piping gets cold.
▪ Soap water contains ammonia which may lead to
corrosion of flared joints (between the brass flare nut
and the copper flare).
1 Charge the system with nitrogen gas up to a gauge pressure of
at least 200 kPa (2 bar). It is recommended to pressurize to
3000 kPa (30 bar) in order to detect small leaks.
2 Check for leaks by applying the bubble test solution to all
connections.
3 Discharge all nitrogen gas.
5.3
Connecting the electrical wiring
DANGER: RISK OF ELECTROCUTION
WARNING
ALWAYS use multicore cable for power supply cables.
Installation manual
10
B
d
b
e f
a
b
c
d
b
3
2
1
3
g
g
4
4
WARNING
If the supply cord is damaged, it MUST be replaced by the
manufacturer, its service agent or similarly qualified
e f
persons in order to avoid a hazard.
5.3.1
Specifications of standard wiring
components
2
Component
Interconnection cable
(indoor↔outdoor)
User interface cable
5.3.2
To connect the electrical wiring to the
indoor unit
It is important to keep the power supply and the transmission wiring
separated from each other. In order to avoid any electrical
interference the distance between both wirings should ALWAYS be
at least 50 mm.
NOTICE
Be sure to keep the power line and transmission line apart
from each other. Transmission wiring and power supply
wiring may cross, but may NOT run parallel.
1 Remove the service cover.
d
b
A
Outside the unit
B
Inside the unit
a
Control box cover
b
Connection of interconnection cable (including earth)
c
Wiring diagram
d
Connection of user interface wiring
e
Sealing material (accessory)
f
Opening for cables
g
Wire
2 User interface cable: Route the cable through the frame,
connect the cable to the terminal block, and fix the cable with a
cable tie.
3 Interconnection cable (indoor↔outdoor): Route the cable
through the frame, connect the cable to the terminal block
(make sure the numbers match with the numbers on the
outdoor unit, and connect the earth wire), and fix the cable with
a cable tie.
Specification
Minimum cable section of
2.5 mm² and applicable for
230 V
H05RN-F (60245 IEC 57)
Vinyl cords with 0.75 to
1.25 mm² sheath or cables
(2‑core wires)
H03VV-F (60227 IEC 52)
Maximum 500 m
c
a
g
f
e
e
g
A B
FNA25~60A2VEB(9)
Split system air conditioners
4P456958-1J – 2020.12
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