9
OUTDOOR UNIT INSTALLED ABOVE INDOOR COIL
Keep the vertical separation between coils to a minimum. However, the vertical dis-
tance can be as great as 120 feet with the condensing unit ABOVE the indoor coil.
Use the following guidelines when installing the unit:
1. DO NOT exceed 120 feet maximum vertical separation.
2. Expansion Valve Coil:
a. The vertical separation can be greater than the value in Table 4, but no
more than 120 feet.
b. No changes are required for expansion valve coils.
3. Always use the smallest liquid line size permitted to minimize the system
charge.
4. Table 4 may be used for sizing horizontal runs.
OUTDOOR UNIT BELOW INDOOR COIL
Keep the vertical separation to a minimum. Use the following guidelines when
installing the unit:
1. DO NOT exceed the vertical separations as indicated on Table 5.
2. Always use the smallest liquid line size permitted to minimize system charge.
3. Table 5 may be used for sizing horizontal runs.
TUBING INSTALLATION
Observe the following when installing correctly sized type “L” refrigerant tubing
between the condensing unit and evaporator coil:
• If a portion of the liquid line passes through a hot area where liquid refrigerant
can be heated to form vapor, insulating the liquid line is required.
• Use clean, dehydrated, sealed refrigeration grade tubing.
• Always keep tubing sealed until tubing is in place and connections are to be
made.
• Blow out the liquid and vapor lines with dry nitrogen before connecting to the
outdoor unit and indoor coil. For an air conditioning system, any debris in the
line set could end up plugging the expansion device.
• As an added precaution, a filter drier is recommended to be installed in the liq-
uid line.
• If tubing has been cut, make sure ends are deburred while holding in a position
to prevent chips from falling into tubing. Burrs such as those caused by tubing
cutters can affect performance dramatically, particularly on small liquid line
sizes.
• For best operation, keep tubing run as short as possible with a minimum num-
ber of elbows or bends.
• Locations where the tubing will be exposed to mechanical damage should be
avoided. If it is necessary to use such locations, the copper tubing should be
housed to prevent damage.
• If tubing is to be run underground, it must be run in a sealed watertight chase.
• Use care in routing tubing and do not kink or twist. Use a tubing bender on the
vapor line to prevent kinking.
• The vapor line must be insulated to prevent dripping (sweating) and prevent
performance losses. Armaflex and Rubatex are satisfactory insulations for this
purpose. Use 1/2” minimum insulation thickness, additional insulation may be
required for long runs.
• Check Table 3 for the correct vapor line size. Check Tables 4 and 5 for the cor-
rect liquid line size.
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