8
GB
D
F
I
NL
E
P
GR
RU
TR
6. Connecting refrigerant pipes and drain pipes
6.1. Refrigerant piping work
This piping work must be done in accordance with the installation manuals for both
outdoor unit.
•
For constraints on pipe length and allowable difference of elevation, refer to
the outdoor unit manual.
•
The method of pipe connection is flare connection (liquid) and flange connec-
tion (gas).
Cautions on refrigerant piping
s
s
s
s
s
Be sure to use non-oxidative brazing for brazing to ensure that no for-
eign matter or moisture enter into the pipe.
s
s
s
s
s
Be sure to apply refrigerating machine oil over the flare connection seat-
ing surface and tighten the connection using a double spanner.
s
s
s
s
s
Provide a metal brace to support the refrigerant pipe so that no load is
imparted to the indoor unit end pipe. This metal brace should be pro-
vided 50 cm away from the indoor unit’s flare connection.
Warning:
When installing and moving the unit, do not charge it with refrigerant other
than the refrigerant specified on the unit.
- Mixing of a different refrigerant, air, etc. may cause the refrigerant cycle to mal-
function and result in severe damage.
Caution:
•
Use refrigerant piping made of phosphorus deoxidized copper and cop-
per alloy seamless pipes and tubes”. In addition, be sure that the inner
and outer surfaces of the pipes are clean and free of hazardous sulphur,
oxides, dust/dirt, shaving particles, oils, moisture, or any other contami-
nant.
•
Never use existing refrigerant piping.
- The large amount of chlorine in conventional refrigerant and refrigerator oil
in the existing piping will cause the new refrigerant to deteriorate.
•
Store the piping to be used during installation indoors and keep both
ends of the piping sealed until just before brazing.
- If dust, dirt, or water gets into the refrigerant cycle, the oil will deteriorate and
the compressor may fail.
•
Apply ester oil, ether oil, or a small amount of alkyl benzene to the flare
and flange connections.
- The refrigerator oil will deteriorate if it is mixed with a large amount of mineral
oil.
[Fig. 6.1.1] (P.3)
A
Connecting pipe (supplied)
Fit packing (supplied) firmly (50 N·m torque) to the flange to prevent a gas leak.
Apply refrigerator oil (ester oil, ether oil, or a small amount of alkyl benzene) to
both sides of the packing.
B
Piping on site
Expand the end of the pipe and braze it to the connecting pipe (non-oxidizing
brazing).
C
Flared nut
Tighten to 55 N·m torque.
Open and close with a double spanner.
Apply refrigerator oil (ester oil, ether oil, or a small amount of alkyl benzene) to
the contact surfaces of the flare.
D
Piping on site
Expand the end of the pipe and connect it. Do not use the supplied piping.
6.2. Drain piping work
[Fig. 6.2.1] (P.3)
A
Drain pan
B
Drain hose
C
Trap (on-site piping work)
D
Unit base (main drain pan)
E
As seen from front of unit.
F
200 mm or more
1.
Ensure that the drain piping is downward (pitch of more than 1/100) to the
outdoor (discharge) side. Do not provide any trap or irregularity on the way.
2. Ensure that any cross-wise drain piping is less than 20 m (excluding the differ-
ence of elevation). If the drain piping is long, provide metal braces to prevent it
from waving. Never provide any air vent pipe. Otherwise drain may be ejected.
4. Installing the unit
4.2. Fixing unit
•
Always ensure that the indoor unit is installed horizontally. If it is installed at an
angle, the center of gravity of the air-conditioner will be co-located with the
center and may tip. This may also result in a drain leakage.
•
Two foundation bolt holes are located at front and rear and two at each side.
Use a combination of four holes to fix the air-conditioner in place at the cor-
ners. (see Fig. 4.2.1)
[Fig. 4.2.1] (P.2)
A
Example 1 - Use holes at front and rear.
B
Example 2 - Use holes at sides.
C
“
•
” indicates foundation bolt holes used.
5. Refrigerant pipe and drain pipe specifications
To avoid dew drops, provide sufficient antisweating and insulating work to the re-
frigerant and drain pipes.
When using commercially available refrigerant pipes, be sure to wind commer-
cially available insulating material (with a heat-resisting temperature of more than
100
°
C and thickness given below) onto both liquid and gas pipes.
Be also sure to wind commercially available insulating material (with a form
polyethylene’s specific gravity of 0.03 and thickness given below) onto all pipes
which pass through rooms.
Use thermal insulating material to insulate piping connections inside the unit (gas:
flanges, liquid: flares) as shown in Fig. 5.1.1.
1
Select the thickness of insulating material by pipe size.
Pipe size
Insulating material’s thickness
6.4 mm to 25.4 mm
More than 10 mm
28.6 mm to 38.1 mm
More than 15 mm
2
If the unit is used on the highest story of a building and under conditions of
high temperature and humidity, it is necessary to use pipe size and insulating
material’s thickness more than those given in the table above.
3
If there are customer’s specifications, simply follow them.
4.1. Hanging unit
•
Use the eyebolts (supplied) and ropes when lifting the air-conditioner into place.
•
Ensure that the air-conditioner is not subject to physical shock while being
lifted into place.
•
Ensure that the rope used is of sufficient strength to support the air-condi-
tioner.
•
Ensure that there is at least 1300 mm of rope between the eyebolts and the
lifting hook.
[Fig. 4.1.1] (P.2)
A
Lifting hook
B
Eyebolt (supplied)
C
Unit
D
Base
E
Unit weight
PFD-P250VM-A: 350 kg
PFD-P500VM-A: 500 kg
Refrigerant pipe
(Flare connection)
Item
Model
250·500
Liquid pipe
ø12.7
Gas pipe
ø28.58
Drain pipe
Rp1
5.1. Refrigerant pipe and drain pipe specifi-
cations
[Fig. 5.1.1] (P.2)
<A> Gas
<B> Liquid
<C> Model 250
<D> Model 500
A
Joint (Ensure that there is no gap in the joint.)
B
Sealing tape
C
Flange
D
Thermal insulating material inside unit
E
Flange cover (supplied)
F
Bind with band or tape.
G
Site thermal insulating material
H
Flare
I
Thermal insulating material (procured on-site)
J
Location of refrigerant piping
K
Refrigerant piping flange (gas)
L
Refrigerant piping flare (ø12.7) (liquid)
M
Drain piping joint outlet (Rp1)
N
As seen from bottom face A.
O
Air outlet
