Sanyo DHX4852 - Manual (Page 19)

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Design of W-2WAY ECO-i SYSTEM Unit Specifications
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Check of limit density
Pay special attention to any location,
such as a basement, etc., where leaking
refrigerant can accumulate, since
refrigerant gas is heavier than air.
WARNING
CAUTION
1. Model Selecting and Capacity Calculator
Additional refrigerant charge amount
Additional refrigerant charge amount is calculated from the liquid tubing total length as follows.
Table 2-12 Amount of Refrigerant Charge Per Meter, According to Liquid Tubing Size
Liquid tubing size Amount of refrigerant
(in. (mm)) charge (oz/ft.)
ш1/4" (ш6.35) 0.279
ш3/8" (ш9.52) 0.602
ш1/2" (ш12.7) 1.38
ш5/8" (ш15.88) 1.99
ш3/4" (ш19.05) 2.78
ш7/8" (ш22.22) 3.93
Required amount of charge = (Amount of refrigerant charge per
meter of each size of liquid tube × its tube length) + (...) + (...)
* Always charge accurately using a scale for weighing.
WARNING
CAUTION
Always check the gas density
limit for the room in which the
unit is installed.
1-5. 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: oz)
(Min. indoor volume where the indoor unit is installed: ft. 3 )
<
Limit density 0.3 (oz/ft. 3 )
The limit density of refrigerant R410A which is used in this unit is
0.3 oz/ft.
3 (ISO 5149).
The shipped outdoor unit comes charged with the amount of refrig-
erant fixed for each type, so add it to the amount that is charged in
the field. (For the refrigerant charge amount at shipment, refer to the
unit’s nameplate.)
Minimum indoor volume & floor area as against the amount
of refrigerant is roughly as given in the following table.
0 0
57
114
170
227
284
341
398
454
511
568
625
682
738
795
852
909
966
1022
1079
1136
0
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
5500
6000
6500
7000
7500
8000
8500
9000
9500
10000
1000 500 1500 2000 2500 3000
Total amount of refrigerant
Min.
indoor v
olume
Min.
indoor floor area
(when the ceilin
g is 8.8 ft.
hi
gh)
ft. 3 ft. 2
oz
Range above
the density limit of
0.3 oz/ft.
3
(countermeasures
needed)
Range below
the density limit of
0.3 oz/ft.
3
(countermeasures
not needed)
TD831138-02_W-2WAY.indb 9 2007/07/26 14:30:30