DRAIN PIPING
19
Tightening
FSN(E)
(N.m)
HP Liquid Gas
RAS-5FSN 16.5 29.4
RAS-8FSN(E) 16.5 44.1
RAS-10FSN(E) 16.5 49.0
RAS-16FSN 24.5 49.0
RAS-20FSN 30.0 58.8
RAS-24FSN 44.1 58.8
RAS-30FSN 44.1 58.8
FXN(E)
(N.m)
HP
Liquid
Valve
Gas Valve
Low
Gas Valve
High
RAS-8FXN(E) 16.5 49.0 44.1
RAS-10FXN(E) 16.5 49.0 44.1
RAS-16FXN 24.5 58.8 49.0
RAS-20FXN 30.0 58.8 49.0
RAS-24FXN 44.1 58.8 49.0
RAS-30FXN 44.1 58.8 49.0
Hexagonal Wrench Size (mm)
Model Liquid Valve Gas Valve
RAS-5FSN 4 8
RAS-8FSN(E) 4 10
RAS-10FSN(E) 4 10
RAS-16FSN 4 10
RAS-20FSN 6 10
RAS-24FSN 10 10
RAS-30FSN 10 10
Model
Liquid
Valve
Gas Valve Low
Gas Valve
High
RAS-8FXN(E)
RAS-10FXN(E)
RAS-16FXN
RAS-20FXN
4
RAS-24FXN
RAS-30FXN
10
10 10
(As for wrenches of 5mm and 10mm, use field-supplied
wrenches.)
CAUTION:
Do not apply force to the spindle valve at the end of
opening (5.0 N.m or smaller). The back seat
construction is not provided.
During the test run, fully open the spindle. If it is not
fully opened, the devices will be damaged.
Caution on Refrigerant Leakage
Specifiers/installers have responsibility to follow local codes
and regulation which specify safety requirements against
refrigerant leakage
Maximum Permissible Concentration of HCFC/HFC Gas
The refrigerant R410A, charged in the SET-FREE FSN
system, is an incombustible and non-toxic gas. However, if
leakage occurs and gas fills a room, it may cause
suffocation.
The maximum permissible concentration of HCFC/HFC
gas, R410A in air is 0.44 kg/m³, according to EN378-1
Therefore, some effective measure must be taken to lower
the R410A concentration in air below 0.44 kg/m³, in case of
leakage.
Calculation of Refrigerant Concentration
1. Calculate the total quantity of refrigerant R (kg) charged
in the system connecting all the indoor units of rooms to
be air-conditioned.
2. Calculate the room Volume V (m³) of each room.
3. Calculate the refrigerant concentration C (kg/m³) of the
room according to the following equation:
R R: Total Quantity of Charged Refrigerant (kg)
C
V: Room Volume (m³)
V C: Refrigerant Concentration 0.44 kg/m³ for R410A
Countermesure for Refrigerant Leakage According to
KHK Standard
1. Provide a shutterless opening which allow fresh air to
circulate into the room.
2. Provide a doorless opening of 0.15% or more size to the
floor area.
3. Pay a special attention to the place, such as a
basement, etc., where refrigerant can stay, since
refrigerant is heavier than air.
14. DRAIN PIPING
Outdoor Unit Drain-Kit (DBS-26) (Optional
Accessory)
In the case that drain water from the heat exchanger of the
outdoor unit is required to be collected, use the Drain Kit.
However, it is not recommended to use it in a snow fall
area. If the drain water is required to be collected
completely, provide a field-supplied drain pan under the
outdoor unit.
Model
Drain Kit
Quantity (units)
RAS-5FSN 3
RAS-8/10/16FSN(E) 4
RAS-16FXN/20/24/30 8
Ø32
43
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