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Table 4 — 38AUQ*16-25 Piping Recommendations (Two-Circuit Unit)
R-410A
Length Linear
Model Nominal
Capacity
Length Equiv
Liquid Line (in.)
Max Lift Cool
38AUQ*16
Max Lift Heat
Vapor Line (in.)
Charge ea. (lb)
Liquid Line (in.)
Max Lift Cool
38AUQ*25
Max Lift Heat
Vapor Line (in.)
Charge ea. (lb)
NOTE(S):
a. For applications with equivalent length greater than 188 ft (57 m) and/or linear length greater than 125 ft (38 m), contact your local Carrier representative.
b. AHRI ratings as listed as only valid with the piping diameters specified.
LEGEND
Length Equiv
—
Equivalent tubing length, including effects of refrigeration
specialties devices
Length Linear
—
Typical linear tubing length, Feet (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:
Linear Length Less than 100 ft: Minimum 2.0°F subcooling
entering TXV
Linear Length Greater than 100 ft: Minimum 0.5°F subcool-
ing entering TXV
Vapor Line
—
Tube size, inches OD
Charge
—
Charge Quantity, lb. Calculated for both liquid line sizes
(where applicable), but only with large suction line size
(where applicable)
CHECK VERTICAL SEPARATION
If there is any vertical separation between the indoor and outdoor
units, check to ensure that the separation is within allowable lim-
its. Relocate equipment if necessary.
PROVIDE SAFETY RELIEF
If local codes dictate an additional safety relief device, purchase
locally and install locally. Installation will require the recovery of
the factory shipping charge before the factory tubing can be cut
and the supplemental relief device is installed.
REFRIGERANT LINE SIZING
Consider the length of the piping required between the outdoor
and indoor units. The maximum allowable line length is 100 ft
(30.5 m). See Table 4. Refrigerant vapor piping should be
insulated.
INSTALL
FILTER
INDICATORS
Every unit MUST have bi-directional filter driers in the liquid
lines. Locate the filter driers at the indoor unit, close to the evapo-
rator coil's thermostatic expansion valve (TXV) inlets.
38AUQ units include two Puron-duty filter driers, shipped in car-
tons attached to the unit basepan. Remove the filter driers and
0-24
0-37
1/2
25
25
1-3/8
b
28.5
1/2
25
25
1-3/8
b
27.1
DRIERS
AND
MOISTURE
EQUIVALENT LENGTH (ft)
25-49
50-74
38-74
75-112
1/2
1/2
50
75
50
60
1-3/8
b
1-1/8
30.6
24.8
1/2
5/8
1/2
37
50
24
50
60
1-3/8
b
1-1/8
29.2
31.1
30.7
prepare to install in the liquid lines at the evaporator coil. Do not
remove connection fitting plugs until ready to connect and braze
the filter driers into the liquid line positions See Table 5.
IMPORTANT: A refrigerant receiver is not provided with
the unit. Do not install a receiver.
Installation of liquid line moisture indicating sight glass in each
circuit is recommended. Locate the sight glass(es) between the
outlet of the filter drier and the TXV inlet.
Refer to Table 6 for recommendations on refrigeration specialties.
Select the filter drier for maximum unit capacity and minimum
pressure drop. Complete the refrigerant piping from the indoor
unit to the outdoor unit before opening the liquid and suction lines
at the outdoor unit.
Table 5 — Puron-duty Filter Drier(s)
MODEL
SIZE
38AUQ*16
38AUQ*25
10
75-99
113-149
1/2
100
60
1-1/8
26.6
5/8
5/8
51
48
60
1-1/8
1-3/8
33.6
37.1
LIQUID LINE
DESSICANT
QTY
OD
VOLUME
2
1/2 in.
16 cu. in.
2
1/2 in.
16 cu. in.
100-125
150-188
a
1/2
125
60
1-1/8
28.6
5/8
63
60
1-3/8
40.2
PART NO.
REF
KH43LS102
KH43LS102
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