Specifications

17
WARNING
Always check the gas den-
sity limit for the room in
which the unit is installed.
1-11. Check of Limit Density
When installing an air conditioner in a room, it is neces-
sary to ensure that even if the refrigerant gas acciden-
tally leaks out, its density does not exceed the limit
level for that room.
If the density could exceed the limit level, it is neces-
sary to provide an opening between the unit and the
adjacent room, or to install mechanical ventilation
which is interlocked with the leak detector.
(Total refrigerant charged amount: kg)
(Min. indoor volume where the indoor unit is installed: m
3
)
≤ Limit density 0.3 (kg/m
3
)
The limit density of refrigerant which is used in this unit
is 0.3 kg/m
3
(ISO 5149).
The shipped outdoor unit comes charged with the
amount of refrigerant fixed for each type, so add it to
the amount that is charged in the field. (For the refriger-
ant charge amount at shipment, refer to the unit’s
nameplate.)
1-12. Installing Distribution Joint
(1) Refer to “HOW TO ATTACH DISTRIBUTION
JOINT” enclosed with the optional distribution joint
kit (DDVE135, DDVE68, DDVI135, DDVI68,
DDVI16).
(2) In order to prevent accumulation of refrigerant oil in
stopped units, if the main tubing is horizontal then
each branch tubing length should be at an angle that
is greater than horizontal. If the main tubing is verti-
cal, provide a raised starting portion for each branch.
(3) If there are height differences between indoor units
or if branch tubing that follows a distribution joint is
connected to only 1 unit, a trap or ball valve must be
added to that distribution joint. (When adding the ball
valve, locate it within 40 cm of the distribution joint.)
(Consult with ARGO separately concerning the ball
valve.)
If a trap or ball valve is not added, do not operate
the system before repairs to a malfunctioning
unit are completed. (The refrigerant oil sent
through the tubing to the malfunctioning unit will
accumulate and may damage the compressor.)
Minimum indoor volume & floor area as against the
amount of refrigerant is roughly as given in the follow-
ing table.
40.5
54.0
20 30 40 50 60 70 80 kg
67.5
81.0
94.5
108.0
121.5
135.0
148.5
162.0
175.5
189.0
202.5
216.0
229.5
243.0
256.5
270.0
m
2
m
3
Total amount of refrigerant
Min. indoor floor area (when the ceiling is 2.7 m high)
Min. indoor volume
Range below the
density limit of
0.3 kg/m
3
(Countermeasures
not needed)
Range above the
density limit of
0.3 kg/m
3
(Countermeasures
needed)
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
15 to 30°
B
A
B
A
Tube branching methods (horizontal use)
Arrow view
Horizontal
line
View as seen
from arrow
Ball valve
(BV: purchased
separately)
Main tubing
Types of vertical trap specifications
(If only 1 unit is connected, a ball
valve is also needed on this side.)
Indoor unit (1)
(When not using ball valve)
(When using ball valve)
Branch tubing is
directed upward.
(Each unit is
connected to tubing
that is either level or
is directed
downward.)
Main tubing
Indoor unit
More than
20 cm
Indoor unit (more than 2 units)
Horizontal
Indoor unit is directed downward
CAUTION
Pay special attention to any
location, such as a basement,
etc., where leaking refrigerant
can accumulate, since refrig-
erant gas is heavier than air.
04-396 Inverter-W_a-p50 ARGO 12/21/04 9:38 AM Page 17