6
|
Installation
Installer reference guide
37
FNA25~60A2VEB(9)
Split system air conditioners
4P550955-3C – 2020.12
6.3.6 To connect the refrigerant piping to the indoor unit
CAUTION
Install the refrigerant piping or components in a position where they are unlikely to
be exposed to any substance which may corrode components containing refrigerant,
unless the components are constructed of materials that are inherently resistant to
corrosion or are suitably protected against corrosion.
WARNING: FLAMMABLE MATERIAL
The R32 refrigerant (if applicable) in this unit is mildly flammable. Refer to the
outdoor unit specifications for the type of refrigerant to be used.
▪
Pipe length
. Keep refrigerant piping as short as possible.
▪
Flare connections
. Connect refrigerant piping to the unit using flare connections.
▪
Insulation
. Insulate the refrigerant piping on the indoor unit as follows:
A
B
a
d
c
e f
b
b
a
d
c
e f
b
b
2
4
3
g
1
2
3
4
g
A
B
1
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.
6.3.7 To check for leaks
NOTICE
Do NOT exceed the unit's maximum working pressure (see "PS High" on the unit
name plate).