9
ENGLISH
13
W
ARNING
Always check the gas density limit for
the room in which the unit is installed.
1-10. Check of Limit Density
When installing an air conditioner in a room, it is necessary to
ensure that even if the refrigerant gas accidentally leaks out, its
density does not exceed the limit level for that room.
If the density could exceed the limit level, it is necessary to
provide an opening between the unit and the adjacent room, or
to install mechanical ventilation which is interlocked with a leak
detector.
(Total refrigerant charged amount:
kg
)
(Min. indoor volume where the indoor unit is installed: m³)
Limit density 0.44 (
kg
/m³)
The limit density of refrigerant R410A which is used in this unit
is 0.44
kg
/m³ (ISO 5149).
The shipped outdoor unit comes charged with the amount of
refrigerant
¿
xed for each type, so add it to the amount that
is charged in the
¿
eld. (For the refrigerant charge amount at
shipment, refer to the unit’s nameplate.)
Minimum indoor volume &
À
oor area as against the amount of
refrigerant is roughly as given in the following
¿
gure.
1-9. System
Limitations
Table 10 : System Limitations
Outdoor unit horsepower
8 HP
10 HP
Number of max. connectable indoor units
15*
15*
Max. allowable indoor/outdoor capacity ratio
50-130%
* In case that the total value of connected indoor units exceeds 1.200, increase the size of the
main tube (LM) by 1 rank for liquid tube. (Tables 2-2 and 10-2)
Table 10-2 : Liquid tube size-up condition of the main tube (LM) according to the number of indoor units
Total value of indoor unit
1.200
1.200 <
1.469
1.469 <
Outdoor unit
horsepower
8 HP
No need to rank up.
Need to increase by 1 rank.
N
eed to increase by 1 rank.*
10 HP
No need to rank up.
Need to increase by 1 rank.
Need to increase by 1 rank.
* Heating capacity may rarely decrease.
20
10
0
304
0
607
08
0
90
10
0
50
m
2
m
3
40.5
54.0
27.0
13.5
0.0
67.5
81.0
94.5
108.0
121.5
135.0
148.5
162.0
175.5
189.0
202.5
216.0
15
10
5
0
20
25
30
35
40
45
50
55
60
65
70
75
80
229.5
85
kg
Total amount of refrigerant
Range below the density limit of 0.44
kg
/m³
(Countermeasures not needed)
Range above the density limit of 0.44
kg
/m³
(Countermeasures needed)
Min. indoor volume
Min. indoor floor area
(when the ceiling is 2.7 m high)
CAUTION
Pay special attention to any location, such
as a basement, etc., where leaking
refrigerant can accumulate, since
refrigerant gas is heavier than air.
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14
1-11. Installing Distribution Joint
(1)
Refer to “HOW TO ATTACH DISTRIBUTION JOINT” enclosed with the optional distribution joint kit
(CZ-P160BK2,
CZ-P680BK2).
●
When connecting a branch tubing to the indoor unit directly, it is necessary for each branch tubing to install at a positive an
gle with
respect to horizontal in order to prevent accumulation of refrigerant oil in stopped units. See the below chart.
Branch tubing system
Restricted
Not restricted
A
B
How to install
branch tubing
When connecting branch tubing to indoor unit directly
When not connecting
branch tubing to
indoor unit directly
Gas tube
Liquid tube
Gas & liquid tubes
When connecting to A
When connecting to B
Horizontal
A
D
B
15
〜
90°
Straight tubing
length over
200mm
Arrow view D
15
〜
90°
15
〜
30°
Straight tubing
length over
200mm
(Branch tubing
angle)
Horizontal
Straight tubing
length over 200mm
or
0
〜
30°
(Branch tubing
angle)
Horizontal
Vertical
Upward
Vertical
Vertical
Vertical
Vertical
Downward
15
〜
90°
Vertical
Straight tubing
length over
200mm
15
〜
90°
Straight tubing
length over
200mm
Vertical
Vertical
Vertical
Header branch system
(Main tubing is horizontal.)
Outdoor
Indoor
Indoor
Indoor
(From 1st branch to tip
of solidly welded part)
Horizontal line
Horizontal line
Install at a positive angle
(15~30°)
Install at a positive angle
(15~30°)
●
Be sure to solidly weld shut the T-joint end (marked by X in
the figure). In addition, pay attention to the insertion depth of
each connected tube so that the flow of refrigerant within the
T-joint is not impeded.
Be sure to use a commercial available T-joint.
●
When using the header joint system, do not make further
branches in the tubing.
Solidly welded shut (X)
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