Table 2 —
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| Equivalent Length |
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| Ft |
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Model | Length Linear |
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Nominal Capacity | Length Equiiv |
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38AUQ*07 | Liquid Line | 3/8 |
| 3/8 |
| 3/8 | 1/2 | 3/8 | 1/2 |
| Max Lift | 25 |
| 50 |
| 48 | 75 | 39 | 100 |
| Cool |
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| Heat | 25 |
| 50 |
| 46 | 60 | 31 | 60 |
| Suction Line | 7/8 |
| 7/8 |
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| Charge (lbs) | 17.8 |
| 18.8 |
| 20.3 | 22.6 | 21.4 | 24.5 |
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38AUQ*08 | Liquid Line | 1/2 |
| 1/2 |
| 1/2 |
| 1/2 |
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| Max Lift | 25 |
| 50 |
| 75 |
| 100 |
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| Cool |
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| Heat | 25 |
| 50 |
| 60 |
| 60 |
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| Suction Line | 7/8 |
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| Charge (lbs) | 20.9 |
| 23.0 |
| 24.9 |
| 26.8 |
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38AUQ*12 | Liquid Line | 1/2 |
| 1/2 |
| 1/2 |
| 1/2 | 5/8 |
| Max Lift | 25 |
| 50 |
| 75 |
| 85 | 100 |
| Cool |
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| Heat | 25 |
| 50 |
| 60 |
| 60 | 60 |
| Suction Line | 7/8 |
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| Charge (lbs) | 26.8 |
| 28.8 |
| 30.7 |
| 33.4 | 37.2 |
Legend: |
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Length Equiv | Equivalent tubing length, including effects of refrigeration specialties devices |
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Liquid Line | Tubing size, inches OD. |
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Max Lift | Maximum liquid lift at maximum permitted liquid line pressure drop |
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Cooling | • Indoor unit ABOVE outdoor unit |
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Heating | • Indoor unit BELOW outdoor unit |
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Suction Line | Tube size, inches OD |
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Charge | Charge Quantity, lbs. Calculated for both liquid line sizes (where applicable), but only with larger |
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| suction line size (where applicable) |
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NOTE: | For applications with linear length greater than 100 ft (30.5 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.
IMPORTANT: A refrigerant receiver is not provided with the unit. Do not install a receiver.
Table 3 — Maximum Vertical Separation*
UNIT 38AUQ | UNIT 40RUQ | DISTANCE FT (M) |
Unit 38AUQ | ||
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| Above Unit 40RMQ |
07 | 07 | 50 (15.2) |
08 | 08 | 60 (18.3) |
12 | 12 | 60 (18.3) |
*Vertical distance between indoor and outdoor units.
INSTALL FILTER DRIER(S) AND MOISTURE INDICATOR(S) — Every unit MUST have a
38AUQ units include one
Table 4 —
Qty | Liquid | Desiccant | Part | ||
Line OD | Volume | Number Ref | |||
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38AUQ*07 | 1 | 8 cu. in. | KH43LG091 | ||
38AUQ*08 | 1 | 16 cu. in. | KH43LG085 | ||
38AUQ*12 | 1 | 16 cu. in. | KH43LG085 |
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 5 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.
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