5
7. Refer to Table 4. Find superheat temperature located in item
6 and suction pressure. At this intersection, note suction line
temperature.
8. If a unit has a higher suction line temperature than charted
temperature, add refrigerant until charted temperature is
reached.
9. If unit has a lower suction line temperature than charted
temperature, reclaim refrigerant until charted temperature is
reached.
10. When adding refrigerant, charge in liquid form into suction
service port using a flow--restricting device.
11. If outdoor air temperature or pressure at suction valve
changes, charge to new suction line temperature indicated
on chart.
NOTE
: If line length is beyond 80 ft (24.38 m) or greater than 20
ft (6.10 m) vertical separation, See Long Line Guideline for
special charging requirements.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit damage.
Compressor damage may occur if system is overcharged.
CAUTION
!
Table 3—Superheat Charging Table (SI)
OUTDOOR
TEMP (
_
C)
EVAPORATOR ENTERING AIR TEMPERATURE (
_
C WB)
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
13
5.0
6.7
7.8
9.4
11.1
11.9
12.8
14.4
16.1
17.8
19.4
20.6
22.2
23.3
25.0
16
3.9
5.6
6.7
8.3
10.0
10.8
11.7
13.3
15.0
16.7
18.3
20.0
21.1
22.2
23.9
18
–
3.3
5.6
7.2
8.9
9.7
10.6
11.7
13.3
15.0
16.7
18.3
20.0
21.1
22.8
21
–
–
3.9
5.6
7.2
8.1
8.9
10.6
11.7
13.3
15.0
16.7
18.3
20.0
21.7
24
–
–
–
3.3
5.0
5.8
6.7
8.3
10.0
11.7
7.8
15.6
17.2
18.9
20.6
27
–
–
–
–
2.8
3.6
4.4
6.7
8.3
10.0
11.7
13.9
15.6
17.2
19.4
29
–
–
–
–
–
–
–
4.4
6.1
8.3
10.6
12.2
14.4
16.7
18.3
32
–
–
–
–
–
–
–
2.8
5.0
7.2
8.9
11.1
13.3
15.0
17.2
35
–
–
–
–
–
–
–
–
3.3
5.6
7.8
10.0
12.2
13.9
16.1
38
–
–
–
–
–
–
–
–
–
4.4
6.7
8.3
11.1
12.8
15.0
41
–
–
–
–
–
–
–
–
–
2.8
5.0
7.2
9.4
12.2
14.4
43
–
–
–
–
–
–
–
–
–
–
3.3
6.1
8.3
11.1
13.9
46
–
–
–
–
–
–
–
–
–
–
–
4.4
7.8
10.0
12.8
Where a dash (–) appears, do not attempt to charge system under these conditions, or refrigerant slugging may occur. Charge must be weighed in.
NOTE
: Superheat ° C is at low---side service port.
Table 4—Required Suction--Line Temperature (
_
C)
SUPERHEAT TEMP
(° C)
SUCTION PRESSURE AT SERVICE PORT (KPA)
743
774
805
836
869
902
957
971
1005
0
1.7
2.8
3.9
5.0
6.1
7.2
8.3
9.4
10.6
1
2.8
3.9
5.0
6.1
7.2
8.3
9.4
10.6
11.7
2
3.9
5.0
6.1
7.2
8.3
9.4
10.6
11.7
12.8
3
5.0
6.1
7.2
8.3
9.4
10.6
11.7
12.8
13.9
4
6.1
7.2
8.3
9.4
10.6
11.7
12.8
13.9
15.0
6
7.2
8.3
9.4
10.6
11.7
12.8
13.9
15.0
16.1
7
8.3
9.4
10.6
11.7
12.8
13.9
15.0
16.1
17.2
8
9.4
10.6
11.7
12.8
13.9
15.0
16.1
17.2
18.3
9
10.6
11.7
12.8
13.9
15.0
16.1
17.2
18.3
19.4
10
11.7
12.8
13.9
15.0
16.1
17.2
18.3
19.4
20.6
11
12.8
13.9
15.0
16.1
17.2
18.3
19.4
20.6
21.7
12
13.9
15.0
16.1
17.2
18.3
19.4
20.6
21.7
22.8
13
15.0
16.1
17.2
18.3
19.4
20.6
21.7
22.8
23.9
14
16.1
17.2
18.3
19.4
20.6
21.7
22.8
23.9
25.0
15
16.7
17.8
18.9
20.0
21.1
22.2
23.3
24.4
25.6
16
17.2
18.3
19.4
20.6
21.7
22.8
23.9
25.0
26.1
17
18.3
19.4
20.6
21.7
22.8
23.9
25.0
26.1
27.2
18
19.4
20.6
21.7
22.8
23.9
25.0
26.1
27.2
28.3
19
20.6
21.7
22.8
23.9
25.0
26.1
27.2
28.3
29.4
20
21.7
22.8
23.9
25.0
26.1
27.2
28.3
29.4
30.6
21
22.8
23.9
25.0
26.1
27.2
28.3
29.4
30.6
31.7
22
23.9
25.0
26.1
27.2
28.3
29.4
30.6
31.7
32.8