Refrigerant Lines - Daikin RR20AVAK9 Installation & Service Reference

Refrigerant Lines

Use only refrigerant grade (dehydrated and sealed) copper tub-
ing to connect the condensing unit with the indoor evaporator.
After cutting the tubing, install plugs to keep refrigerant tubing
clean and dry prior to and during installation. Tubing should
always be cut square keeping ends round and free from burrs.
Clean the tubing to prevent contamination.
Do NOT let refrigerant lines come in direct contact with plumb-
ing, ductwork, floor joists, wall studs, floors, and walls. When
running refrigerant lines through a foundation or wall, openings
should allow for sound and vibration absorbing material to be
placed or installed between tubing and foundation. Any gap be-
tween foundation or wall and refrigerant lines should be filled
with a pliable silicon-based caulk, RTV or a vibration damping
material. Avoid suspending refrigerant tubing from joists and
studs with rigid wire or straps that would come in contact with
the tubing. Use an insulated or suspension type hanger. Keep
both lines separate and always insulate the suction and liquid
lines.
These sizes are recommended for line lengths of 24 meters (79
feet) or less to obtain optimum performance. For alternate line
sizing options or runs of more than 24 meters (79 feet), refer to
Remote Cooling Service Manual or TP-107 Long Line Set Applica-
tion R-410A or contact your distributor for assistance.
Insulation is necessary to prevent condensation from forming
and dropping from the suction line. Armflex (or satisfactory
equivalent) with 3/8" min. wall thickness is recommended. In
severe conditions (hot, high humidity areas) 1/2" insulation may
be required. Insulation must be installed in a manner which pro-
tects tubing from damage and contamination.
Where possible, drain as much residual compressor oil from ex-
isting systems, lines, and traps; pay close attention to low areas
where oil may collect. NOTE: If changing refrigerant types, en-
sure the indoor coil and metering device is compatible with the
type of refrigerant being used; otherwise, the indoor coil must
be replaced.
Burying Refrigerant Lines
If burying refrigerant lines can not be avoided, use the following check-
list.
1. Insulate liquid and suction lines separately.
2. Enclose all underground portions of the refrigerant lines in water-
proof material (conduit or pipe) sealing the ends where tubing
enters/exits the enclosure.
3. If the lines must pass under or through a concrete slab, ensure
lines are adequately protected and sealed.
To avoid possible explosion:
• Never apply flame or steam to a refrigerant cylinder. If you
must heat a cylinder for faster charging, partially immerse
it in warm water.
• Never fill a cylinder more than 80% full of liquid refrigerant.
• Never add anything other than R-22 to an R-22 cylinder or
R-410A to an R-410A cylinder. The service equipment used
must be listed or certified for the type of refrigerant used.
• Store cylinders in a cool, dry place. Never use a cylinder
as a platform or a roller.
The compressor POE oil for R-410A units is extremely susceptible
to moisture absorption and could cause compressor failure. Do
not leave system open to atmosphere any longer than necessary
for installation.
RECOMMENDED INTERCONNECTING TUBING (m / ft)
0 - 7.5 m
Cond
0 - 24 feet
Unit
Tons Suct Liq
1 1/2 5/8 1/4
2 5/8 1/4
2 1/2 5/8 1/4
3 3/4 3/8
3 1/2 7/8 3/8
4 7/8 3/8
5 7/8 3/8
* Lines greater than 24 meters (79 feet) in length or vertical elevation
changes more than 15.25 meters (50 feet) refer to the Remote Cooling
Service Manual or contact your distributor for assistance.
5
CAUTION
7.6 - 15 m 15.25 - 24 m*
25 - 49 feet 50 - 79 feet
Line Diameter (In. OD)
Suct Liq Suct
3/4 3/8 3/4
3/4 3/8 3/4
3/4 3/8 7/8
7/8 3/8 1 1/8
1 1/8 3/8 1 1/8
1 1/8 3/8 1 1/8
1 1/8 3/8 1 1/8
Figure 3B
Liq
3/8
3/8
3/8
3/8
3/8
3/8
3/8