9
Table 2 – 38AUQ*16--25 Piping Recommendations (Two-Circuit Unit)
R-410A
Equivalent Length
Model
Nominal Capacity
Length Equiv
0-38
38-75
75-113
113-150
150-188
Length Lin
0-25
25-50
50-75
75-100
100-125
38AUQ*16
Liquid Line
1
/
2
1
/
2
1
/
2
1
/
2
1
/
2
Max Lift
Cool
25
50
75
100
125
Heat
25
50
60
60
60
Vapor Line
1
1
/
8
1
1
/
8
1
1
/
8
1
1
/
8
1
1
/
8
Charge ea. (lbs)
20.9
22.8
24.8
26.6
28.6
38AUQ*25
Liquid Line
1
/
2
1
/
2
5
/
8
1
/
2
5
/
8
5
/
8
5
/
8
Max Lift
Cool
25
37
50
24
51
48
63
Heat
25
50
50
60
60
60
60
Vapor Line
1
1
/
8
1
1
/
8
1
1
/
8
1
1
/
8
1
3
/
8
1
3
/
8
Charge ea. (lbs)
26.9
28.8
30.7
30.7
33.6
37.1
40.2
Legend:
Length Equiv
Equivalent tubing length, including effects of refrigeration specialties devices
Linear Lin
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 —
S
Linear Length Less than 100 ft: Minimum 2.0
°
F subcooling entering TXV
S
Linear Length Greater than 100 ft: Minimum 0.5
°
F subcooling entering TXV
Vapor Line
Tube size, inches OD
Charge
Charge Quantity, 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 188 ft (57 m) and/0r linear length greater than 125 ft (38 m),
contact your local Carrier representative.
Check Vertical Separation —
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
—
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 2. Refrigerant vapor
piping should be insulated.
Install Filter Driers and Moisture Indicators
—
Every unit MUST have bi-directional filter driers in the
liquid lines. Locate the filter driers at the indoor unit,
close to the evaporator coil’s thermal expansion valve
(TXV) inlets.
38AUQ units include two Puron-duty filter driers, shipped
in cartons attached to the unit basepan. Remove the filter
driers and 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 3.
IMPORTANT
: A refrigerant receiver is not
provided with the unit. Do not install a receiver.
Installation of liquid line moisture indicating sightglass in
each circuit is recommended. Locate the sightglass(es)
between the outlet of the filter drier and the TXV inlet.
Refer to Table 4 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.
38A
U
Q
Summary of Contents for 38AUQ 16 Series
Page 4: ...4 C10675 Fig 2 38AUQ 25 Unit Dimensions 38AUQ...
Page 19: ...19 C10784 Fig 16 38AUQ 16 Charging Chart 38AUQ...
Page 20: ...20 C10785 Fig 17 38AUQ 25 Charging Chart 38AUQ...
Page 21: ...21 C10786 Fig 18 38AUQ 16 Power Schematic 208 230 3 60 shown 38AUQ...
Page 22: ...22 C10787 Fig 19 38AUQ 25 Power Schematic 208 230 3 60 shown 38AUQ...
Page 23: ...23 C10788 Fig 20 38AUQ 16 25 Control Schematic 38AUQ...
Page 41: ...41 C10363 Fig 35 Wind Baffles Fabrication 38AUQ...
Page 42: ...42 C10366 Fig 36 15 Ton Wind Baffle Brackets Fabrication 38AUQ...
Page 44: ...44 RIGHT BACK LEFT FRONT C10368 Fig 38 Wind Baffle Installation 20 Ton Units 38AUQ...
Page 45: ...45 38AUQ...
