Table2 - 38AUQ*07-12 Piping Recommendations (Single-Circuit Unit)
R-410A Equivalent Length
Ft 0-38 38-75 75-113 113-150
Model Length Linear 0-25 25-50 50-75 75-100
Nominal Capacity Length Equiiv 0-38 38-75 75-113 113-115
38AUQ*07 Liquid Line 3/8 3/8 3/8 1/2 3/8 1/2
Max Lift
Cool 25 50 48 75 39 100
Heat 25 50 48 80 31 80
Vapor Line 7/8 7/8 1-1/8 1-1/8
Charge (Ibs) 17.8 18.8 20.3 22.8 21.4 24.5
38AUQ*08 Liquid Line 1/2 1/2 1/2 1/2
Max Lift
Cool 25 50 75 1O0
Heat 25 50 60 60
Vapor Line 7/8 1-1/8 1-1/8 1-1/8 1-1/8
Charge (Ibs) 20.9 23.0 24.9 26.8
38AUQ*12 Liquid Line 1/2 1/2 1/2 1/2 8/8
Max Lift
Cool 25 50 75 85 1O0
Heat 25 50 60 60 60
Vapor Line 7/8 1-1/8 1-1/8 1-1/8 1-1/8 1-3/8
Charge (Ibs) 26.8 28.8 30.7 33.4 37.2
Legend:
Length Equiv Equivalent tubing length, including effects of refrigeration specialties devices
Liquid Line Tubing size, inches OD.
Max Lift Maximum liquid lift at maximum permitted liquid line pressure drop
Cooling ° Indoor unit ABOVE outdoor unit
Heating ° Indoor unit BELOW outdoor unit
Vapor Line Tube size, inches OD
Charge Charge Quantity, Ibs. Calculated for both liquid line sizes (where applicable), but only with large
suction line size (where applicable)
NOTE: For applications with linear length greater than 100 ft (30.5 m), contact your local Carrier
representative.
Check Vertical Separation i
If there is any vertical separation between the indoor and
outdoor units, check to ensure that the separation is within
allowable limits. Relocate equipment if necessary.
Provide Safety Relief I
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 i
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 2. Refrigerant vapor
piping should be insulated.
Risers in Heat Pump Piping Systems i
Elevation differences between the outdoor unit and the
indoor unit in heat pump systems will create two riser line
conditions - one in the liquid line in one mode and one in
the vapor line in the opposite mode. See the following
table to identify which lines are risers in this installation.
38AUQ Unit 38AUQ Unit
Mode BELOW ABOVE
ID Unit ID Unit
Riser in Riser in
Vapor
Cooling Liquid (Suction Gas)
Vapor
Heating (Discharge Gas) Liquid
Liquid Line Riser: Refer to Pipe Sizing Table, Table 2;
observe Max Lift limits for liquid line according to unit
mode, equivalent line length and pipe size.
Vapor Line Riser: Refer to Table 3 for maximum pipe
size in single pipe vapor risers. All pipe size
recommendations in Pipe Sizing Table, Table 2, satisfy
these maximum vapor line sizes. If this installation is
re-using existing piping, check the vapor line sizes
against these maximum values; replace riser sections with
these pipe sizes if necessary.
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