Installation Of Piping - Daikin RCS Series Installation And Maintenance Manual

Installation of Piping

WARNING
Do not use oxygen to purge lines or pressure system for leak test. Oxygen
reacts violently with oil, which can cause an explosion resulting in severe
personal injury or death.
NOTE: The condensing unit is shipped with a holding charge
of dry nitrogen which must be purged from the unit
before evacuation.
Once located, the condensing unit is ready to be
interconnected with the evaporator using ONLY refrigeration
grade dehydrated tubing.The following should be considered
when connecting the tubing.
1 . Pitch vapor line toward the compressor approximately
1/2" every 10 feet to facilitate oil return.
2 . It is recommended that the sight glass, filter drier and
liquid line solenoid valve be installed in the liquid line just
prior to the evaporator.
3 . Silver solder (such as silfos, Easy Flow, etc.) should be
used for all refrigerant joints.
4 . Thoroughly clean all joints before fluxing. DO NOT USE
ACID FLUX.
5 . When fluxing, limit the application of paste to the
minimum and always apply flux to the male portion of the
connection.
6 . Vapor lines should be insulated to prevent condensate
drip. Use insulation of at least 3/8" wall thickness. The
insulation should be installed on the tubing prior to
making the sweat connections.
7 . Insulate the liquid line whenever the heat pickup or
transfer can affect the subcooling.
8 . Care should be taken to avoid transmission of noise or
vibration to building structure.
Table 8: Refrigerant Piping Data
Equivalent Length, ft. [m] of Straight Type "L" Tubing
for Nonferrous Valves/Fittings (Brazed)
Tube
Solenoid Angle
Size,
Valve Valve
O.D.
1/2 70 [21 .3] 8 .3 [2 .5]
5/8 72 [21 .9] 10 .4 [3 .2]
3/4 75 [22 .9] 12 .5 [3 .8]
7/8 78 [23 .8] 14 .6 [4 .4]
1-1/8 — 18 .8 [5 .7]
1-3/8 — 22 .9 [7 .0]
1-5/8 — 27 .1 [8 .3]
2-1/8 — 35 .4 [10 .8]
IM 962-4 • AIR-COOLED SPLIT SYSTEM CONDENSERS
Short Long
Tee Line
Radius Radius
Flow
Ell Ell
1 .6 [0 .5] 1 .0 [0 .3] 1 .0 [0 .3]
1 .9 [0 .6] 1 .2 [0 .4] 1 .2 [0 .4]
2 .1 [0 .7] 1 .4 [0 .4] 1 .4 [0 .4]
2 .4 [0 .7] 1 .6 [0 .5] 1 .6 [0 .5]
3 .0 [0 .9] 2 .0 [0 .6] 2 .0 [0 .6]
3 .6 [1 .1] 2 .4 [0 .7] 2 .4 [0 .7]
4 .2 [1 .3] 2 .8 [0 .8] 2 .8 [0 .8]
5 .3 [1 .6] 3 .5 [1 .1] 10 .7 [3 .3] 10 .7 [3 .3]
Typical Piping Recommendations
The following will be of help in accomplishing a successful
1 . Size liquid line for no more than 10°F loss which
corresponds to approximately 3 psig pressure drop.
2 . Size vapor lines for no more than 2°F loss which
corresponds to approximately 3 psig pressure drop.
3 . Install sight glass, filter drier and solenoid valve in
liquid line adjacent to evaporator. Filter drier should be
between the condensing unit and sight glass.
4 . Pitch all horizontal vapor lines downward in the direction
of flow (1/2" to 10 ft. run).
5 . When making up refrigerant piping, take every
precaution to prevent dirt and moisture from entering the
piping.
6 . Locate the condensing unit and evaporator(s) as close
together as possible to minimize piping runs.
7 . Liquid or vapor lifts not to exceed 60 ft.
8 . To prevent suction line breakage due to vibration and to
prevent tubing noise transmission into the conditioned
space, the suction clamp must be installed after tubing is
brazed as illustrated in
Figure 9: Suction Clamp
Tee
Branch
Flow
3 .1 [0 .9]
3 .6 [1 .1]
4 .2 [1 .3]
4 .8 [1 .5]
6 .0 [1 .8]
7 .2 [2 .2]
8 .4 [2 .6]
12
Installation
Figure 9 .
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