Lennox ROOFTOP FLEXY FXK 100, Installation, Operating And Maintenance

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IOM – FLEXY II – 1007 – E Page 84
REFRIGERANT DEFINITION
R-410A is an HFC, or hydro fluorocarbon, and is made of
hy drogen, fluorine, and carbon atoms. Because it has no
chlorine, it won’t interact with the ozone layer once it
breaks down. It’s non-toxic and non-inflammable.
CHEMICAL CHARACTERISTICS OF REFRIGERANT
*1 see table below :
Refrigerant Safety classifications from ASHRAE Standard
Lower toxicity Higher toxicity
Higher
flammability
A3 B3
LFL≤0.10kg/m3 or
heat of
combustion≥19000k
J/kg
Lower
flammability
A2 B2
LFL>0.10kg/m3 and
heat of combustion
>19000kJ/kg
No flame
propagation
A1 B1 No LFL
No indentified
toxicity at
concentrati on
≤ 400ppm
Evi denc e of
toxicity below
400ppm
LFL = Lower Flammability Limit
*2 Based on CFC11
*3 Based on CO2
STANDARDS THAT MUST BE MET WITH R410A:

An ester oil (POE) is used f or R410A (as with
R407c)

It’s important to work with absolute cleanliness

Brazing must be done with the use of Nitrogen
(OFN)

The sy stem must be evacuated thoroughly
(0.3mbar or less)

The sy stem must alway s be charged in the liquid
phase
S ATURATION PRESSURE
Satur ation press ure (relati ve press ure in bars)
Temp. °C R22 R407C Vapor R410A
70 28.97 31.94 46.54
65 26.01 28.55 41.7
60 23.27 25.44 37.29
58 22.24 24.26 35.63
56 21.24 23.13 34.03
54 20.27 22.04 32.49
52 19.33 20.99 31.01
50 18.43 19.98 29.57
48 17.55 19 28.19
46 16.70 18.05 26.86
44 15.89 17.14 25.57
42 15.10 16.26 24.33
40 14.34 15.42 23.14
38 13.60 14.61 21.99
36 12.89 13.82 20.88
34 12.21 13.07 19.81
32 11.55 12.35 18.79
30 10.92 11.65 17.8
28 10.31 10.99 16.85
26 9.72 10.35 15.93
24 9.16 9.73 15.06
22 8.62 9.14 14.21
20 8.10 8.58 13.41
18 7.60 8.04 12.63
16 7.12 7.52 11.89
14 6.67 7.03 11.17
12 6.23 6.55 10.49
10 5.81 6.1 9.84
8 5.41 5.67 9.21
6 5.03 5.26 8.61
4 4.66 4.87 8.04
2 4.31 4.5 7.5
0 3.98 4.14 6.98
-2 3.66 3.81 6.48
-4 3.36 3.49 6.01
-6 3.08 3.19 5.56
-8 2.81 2.9 5.14
-10 2.55 2.63 4.73
-12 2.30 2.37 4.35
-14 2.07 2.13 3.98
-16 1.85 1.9 3.64
-18 1.65 1.68 3.31
-20 1.45 1.48 3
Name R22 R407C R410A
Component HCFC22
HFC32/HFC12
5/HFC134a
HFC32/HFC1
25
Composition (%) 100 23/25/52 50/50
Type of refrigerant
Single
refrigerant
Non-azeotropic
refrigerant
mixture
Near
azeotropic
refrigerant
mixture
Chlorine Contai ned Not contained Not contained
Safety Class *1 A1 A1/A1 A1/A1
Ozone Depl etion
Potential (ODP) *2
0.055 0 0
Global War ming
Potential (GWP) *3
1700 1530 1730
Refrigerant charging
method
Gas
change
Refrigerant is
taken out from
the liquid
phas e of gas
cylinder
Refrigerant is
taken out from
the liquid
phas e of gas
cylinder
Additional c harge
due to r efrigerant
leakage
Possible
Possible
temporaril y
Possible
R410A