8
GB
D
F
I
NL
E
P
GR
RU
TR
7.2. Drain piping work
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.
(
1
)
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.
3. Use a hard vinyl chloride pipe VP-25 (with an external diameter of 32 mm) for
drain piping.
4. Ensure that collected pipes are 10 cm lower than the unit body’s drain port as
shown in
2
.
5. Do not provide any odor trap at the drain discharge port.
6. Put the end of the drain piping in a position where no odor is generated.
7. Do not put the end of the drain piping in any drain where ionic gases are
generated.
[Fig. 7.2.1] (P. 4)
A
Downward slope 1/100 or more
B
Drain hose (Accessory)
C
Indoor unit
D
Collective piping
E
Maximize this length to approx. 10 cm
6. 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.
1
Select the thickness of insulating material by pipe size.
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.
6.1. Refrigerant pipe and drain pipe specifi-
cations
(mm)
Pipe size
Insulating material’s thickness
6.4 mm to 25.4 mm
More than 10 mm
28.58 mm to 38.1 mm
More than 15 mm
Refrigerant piping
(flared joints)
Item
Model
80
140
Liquid piping
ø9.52
Gas piping
ø15.88
ø19.05
Drain piping
32
6.2. Refrigerant pipe, drain pipe and filling
port
[Fig. 6.2.1] (P. 3)
A
Air inlet
B
Refrigerant piping (liquid)
C
Refrigerant piping (gas)
D
Control box
E
Drain outlet
F
Air outlet
6.3. Request for refrigerant piping connec-
tion
Connecting refrigerant piping
•
After connecting refrigerant piping, insulate the joints (flared joints) with ther-
mal insulation tubing as shown below.
[Fig. 6.3.1] (P. 3)
A
Thermal insulation tubing
1
B
Caution:
Pull out the thermal insulation on the refrigerant piping at the site, insert the flare
nut to flare the end, and replace the insulation in its original position.
Take care to ensure that condensation does not form on exposed copper piping.
C
Liquid end of refrigerant piping
D
Gas end of refrigerant piping
E
Site refrigerant piping
F
Main body
G
Marked “GAS”
H
Marked “OUTSIDE”
I
Flared insulation (supplied)
2
J
Marked “INSIDE”
K
Thermal insulation
L
Pull
M
Flare nut
N
Return to original position
O
Ensure that there is no gap here
P
Plate on main body
Q
Outside
R
Inside
S
Remove tape
T
Thermal insulation tubing (small) (supplied)
1
U
Tie (large) (supplied)
4
V
Ensure that there is no gap here. Place join upwards.
Refrigerant amount adjustment
Refer to the installation manual for the outdoor unit for details on adjusting the
amount of refrigerant.
7. Connecting refrigerant pipes and drain pipes
7.1. Refrigerant piping work
This piping work must be done in accordance with the installation manuals for both
outdoor unit and BC controller (simultaneous cooling and heating series R2).
•
Series R2 is designed to operate in a system that the refrigerant pipe from an
outdoor unit is received by BC controller and branches at the BC controller to
connect between indoor units.
•
For constraints on pipe length and allowable difference of elevation, refer to
the outdoor unit manual.
•
The method of pipe connection is flare connection.
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 (R407C or R22) 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 C1220 (CU-DHP) phosphorus deoxidized
copper as specified in the JIS H3300 “Copper and copper 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, shav-
ing particles, oils, moisture, or any other contaminant.
•
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.
•
Use Suniso 4GS or 3GS (small amount) refrigerator oil to coat the flare
and flange connection part. (For models using R22)
•
Use ester oil, ether oil or alkylbenzene (small amount) as the refrigerator
oil to coat flares and flange connections. (For models using R407C)
- The refrigerant used in the unit is highly hygroscopic and mixes with water
and will degrade the refrigerator oil.
Summary of Contents for CITY MULTI PEFY-P-VMH-A-F Series
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