Product data

Refrigerant Lines – AN009/012 & BK009/012
1. The AN009/012 & BK009/012 are shipped with a full charge of R-22 refrigerant. Since all refrigerant lines are
on the low side of the system, it is not normally necessary to add or remove charge.
2. The AN009/012 & BK009/012 have mixed phase refrigerant flow in the liquid line. DO NOT install a filter
drier in the liquid line. The liquid line must be insulated.
3. No line size changes should be made.
4. All charges, line sizes, and capacities are based on 25 feet of refrigerant lines. For runs over 25 feet see Long
Line Applications.
Note: For runs less than 25 feet, some of the charge may need to be removed to obtain the correct
system superheat. The minimum line length should be 8 feet.
5. Refrigerant lines should not be buried in the ground. If it is necessary to bury the lines, not more than 36”
should be buried. Provide a minimum 6” vertical rise to the service valves to prevent refrigerant migration.
6. The vapor line must be insulated. Use a minimum of ½” thick insulation. Closed cell insulation is
recommended in all long line applications.
7. Special consideration should be given to isolating interconnecting tubing from the building structure. Isolate
the tubing so that vibration or noise is not transmitted into the structure.
Long Line Applications
1. Liquid lines should be 1/4” only. DO NOT resize liquid lines for additional length. The liquid line must be
insulated
2. When sizing vapor line, determine line length by finding equivalent feet of pipe. Equivalent line lengths equal
the linear length (measured length) of interconnecting vapor tubing plus losses due to elbows (see Fitting Loss
in Equivalent Feet for Elbows Table #2) If the number of elbows is not yet known, assume 50% additional
length for the equivalent length. Be sure oil can be properly returned to the compressor. Consult the Carrier
Systems Design Guide for proper oil return recommendations. For line lengths from 8 to 50 feet no special
piping requirements are normally required.
3. A capillary metering device is used for the AN. The BK series use non-serviceable Aeroquip pistons.
4. Horizontal configuration Diagram #1
a. Slope the vapor line toward the indoor unit to provide for refrigerant migration protection during the
off cycle due to temperature differences caused by slight elevation changes between indoor and
outdoor units. A solenoid valve is not required for the AN/BK009/012
5. Elevated configuration: (Lift) Indoor unit above outdoor unit Diagram #3
a. The maximum elevation difference is 30 feet for the AN/BK009/012 and the maximum equivalent
length of piping is 50 feet. See Table #1
b. Install an inverted trap in the vapor line. The top of the trap must be above the top of the indoor unit.
This prevents the refrigeration from collecting in the vapor line.
6. Lowered configuration: (Drop) Indoor unit below outdoor unit Diagram #4
a. The maximum elevation difference is 30 feet for the AN/BK009/012 and the maximum equivalent
length of piping is 50 feet.
7. Additional Charge: No additional charge should be required