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2.
Allowable pipe length
See the table below concerning lengths and heights. Refer to figures
2~5. Assume that the longest line in the figure corresponds with the
actual longest pipe, and the highest unit in the figure corresponds
with the actual highest unit.
Pair
Maximum allowable piping length
(Parenthesized figure represents
Twin/Triple
equivalent length)
Double twin
Twin
Maximum total one-way pipe
Triple
length
Double twin
Twin/Triple
Maximum branch pipe length
Double Twin
Twin
Maximum difference between
Triple
branch lengths
Double Twin
Maximum difference between
Double Twin
each 1st branch
Maximum difference between
Double Twin
each 2nd branch
Maximum height between indoor
All
and outdoor
Twin/Triple/
Maximum height between indoors
Double Twin
The minimal piping length should be 7.5 m. If installation is
performed with less field piping, the system will be overcharged
(abnormal HP, etc.). If the distance between indoor and outdoor unit
is less than 7.5 m, please make sure that the piping length is ≥7.5 m
by additional bending of the pipes.
P
RECAUTIONS ON REFRIGERANT PIPING
When a heat pump outdoor unit is installed below the indoor unit, the
following can occur:
when the unit stops, oil will return to the discharge side of the
compressor. When starting the unit, this can cause liquid (oil)
hammer.
the oil circulation will decrease
To solve these phenomena, provide oil traps in the gas pipe every
15 m if the level difference (H) is more than 15 m. See
A
outdoor unit
B
indoor unit
C
gas pipe
D
liquid pipe
E
oil trap
NOTE
if the outdoor unit is installed above the indoor unit, oil
traps are not necessary.
Connecting the refrigerant piping
Use R407C only when adding refrigerant
Installation tools:
Make sure to use installation tools (gauge manifold charge
hose, etc.) that are exclusively used for R407C installa-
tions to withstand the pressure and to prevent foreign
materials (e.g. mineral oils and moisture) from mixing into
the system. Vacuum pump (use a 2-stage vacuum pump
with a non-return valve):
Make sure the pump oil does not flow oppositely into the
system while the pump is not working.
Use a vacuum pump which can evacuate to –100.7 kPa
(5 Torr, –755 mm Hg).
R(Y)P200+250B8W1
Split System air conditioners
4PW23688-1C
L1
50 m
L1+L2
(70 m)
L1+L2+L4
L1+L2+L3
L1+L2+L3+L4
60 m
L1+L2+L3+L4+L5+L6+L7
L2
20 m
L2+L4
L2–L3
L2–L4
10 m
(L2+L4)–(L3+L7)
L2–L3
10 m
L4–L5, L6–L7
10 m
H1
30 m
H2
0.5 m
figure
6.
Installation of refrigerant piping is possible as front connection, side
connection and bottom connection.
1
Flange
2
Flare nut
3
Gas side (attached pipe)
4
Liquid side
5
Brazing
6
Knock out hole
Remarks:
Front connection:
Make sure to close the piping intake hole again after installation
work.
Bottom Connection:
Remove the knock out hole by drilling the 2 concave recesses
with a Ø6 mm drill (see figure). Afterwards, paint the edges to
avoid rusting.
A
Knock out hole
B
Drill
C
Concave recess
Liquid side:
Provide a liquid side pipe (field supply),
and connect it to the stop valve. Take
care not to allow it to touch the gas side
pipe.
Gas side:
Cut the gas side accessory pipe and make connection using an
elbow (field supply).
A
cutting position
Operating stop valve: refer to
To open:
1.
Remove the cap (1) and turn the shaft (2) counterclockwise with
hexagon socket screw keys.
2.
Turn it all the way until the shaft stops.
3.
Tighten the cap firmly.
To close:
1.
Remove the cap and turn the shaft clockwise.
2.
Tighten the shaft firmly until it reaches the sealed area (4) of the
body.
3.
Tighten the cap firmly.
B
A
C
m
0 m
± 1 0
A
m
7 m
± 1 6
figure 7
Installation manual
3
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