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Table 4 – 38AUD 15-25 Piping Recommendations (Two-Circuit Unit)
SI
NOTE: 38AUD requires TWO sets of refrigeration piping
R-410A
Equivalent
Length m
Model
Linear
Length m
38AUD*16
Liquid Line
Max Lift
Suction Line
Charge (kg) A/B
38AUD*25
Liquid Line
Max Lift
Suction Line
Charge (kg) A/B
English
NOTE: 38AUD requires TWO sets of refrigeration piping
R-410A
Equivalent
Length
ft
m
Model
Linear
Length ft
38AUD*16
Liquid Line
Max Lift
Suction Line
Charge (lbs) A/B
38AUD*25
Liquid Line
Max Lift
Suction Line
Charge (lbs) A/B
Legend:
Equiv Length
Equivalent tubing length, including effects of refrigeration specialties devices
Linear Length
Typical linear tubing length, (50% added to linear to define Equivalent Length for this table)
Liquid Line
Tubing size, inches OD.
Max Lift
Maximum liquid lift (indoor unit ABOVE outdoor unit only), at maximum permitted liquid line pressure drop —
S Linear Length Less than 30 m (100 ft): Minimum 1.1°C (2.0°F) subcooling entering TXV
S Linear Length Greater than 30 m (100 ft): Minimum 0.3°C (0.5°F) subcooling entering TXV
Suction Line
Tube size, inches OD
Charge
Charge Quantity, kg (lbs). Calculated for both liquid line sizes (where applicable), but only with larger suction line size
(where applicable)
NOTE:
For applications with equivalent length greater than 57 m (188 ft) and/or linear length greater than 38 m (125 ft),
contact your local Carrier representative.
Table 5 –
38AUD Maximum Suction Pipe Size
Model:
Unit Size
16
38AUD
25
INSULATE SUCTION LINES — Apply closed-cell
tubular insulation to all suction lines between evaporator
coil connection and 38AUD unit's suction service valve.
0-12
12-23
0--- 7.5
7.5--- 15
3
3
/
/
8
8
7.5
15
7
7
/
/
8
8
5.9
6.3
1
1
/
/
2
2
7.5
15
7
1
/
1
/
8
8
9.4
10.3
0--- 12
38--- 75
0--- 7.5
7.5--- 15
0--- 25
25--- 50
3
3
/
/
8
8
25
50
7
7
/
/
8
8
12.9
13.9
1
1
/
/
2
2
7.5
15
7
1
/
1
/
8
8
20.7
22.8
Maximum Tube Size
5
1
/
8
5
1
/
8
23-34
34-46
15--- 23
23--- 30
3
1
3
/
/
/
8
2
8
22
23
13
1
1
1
/
1
/
8
8
7.0
8.0
7.5
1
1
/
/
2
2
23
20
1
1
1
/
1
/
8
8
11.2
12.1
75--- 113
113--- 150
15--- 23
23--- 30
50--- 75
75--- 100
3
1
3
/
/
/
8
2
8
71
75
43
1
1
1
/
1
/
8
8
15.4
17.7
16.5
1
1
/
/
2
2
23
20
1
1
1
/
1
/
8
8
24.7
26.6
Hot Gas Bypass — Hot gas bypass, if used, should be
introduced before the evaporator. (A bypass route that also
bypasses the evaporator circuit may lead to oil trapping in
the evaporator circuit during low load conditions and then
to oil slugging as evaporator load increases.) Model
38AUD units do not include a hot gas stub connection; a
tee must be field-supplied and installed in the compressor
1
discharge line. Run a
/
-in OD line between outdoor unit
2
and evaporator coil inlet. Install an Auxiliary Side
Connector at the evaporator between TXV and distributor
(follow instructions for the side connector part). Insulate
the hot gas line.
10
46-57
30--- 38
1
1
/
/
2
2
30
38
1
1
/
8
8.9
9.8
5
1
5
/
/
/
8
2
8
28
23
33
3
1
/
8
13.8
13.0
15.1
150--- 188
46-57
100--- 125
1
1
/
/
2
2
100
125
1
1
/
8
19.6
21.6
5
1
5
/
/
/
8
2
8
28
23
33
3
1
/
8
30.4
28.6
33.3
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