Stulz FLAIR series, Installation, Operation And Maintanance Manual

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FLAiR Series Installation, Operation & Maintenance Manual
(©Aug, 2007)
Air Technology Systems, Inc.
2-4
2.5 Air Distribution
2.5.1 Upflow Configuration Air Pattern
In FLAiR upflow configured units, the conditioned
supply air discharges through the top opening. The
return air pattern is a front free return, (see Figure 4).
There is no air distribution connection required on the
system. The system should be positioned to allow the
air to move as freely as possible within the room to be
conditioned.
2.6 Piping Connections
2.6.1 Refrigerant
2.6.1.1 Self-Contained Systems
No refrigerant connections are required for self-
contained water or glycol cooled systems (Models
FCS-018/060-W/G-( )).
2.6.1.2 Split Systems
Split air-cooled systems with a remote condenser or
remote condensing unit will require field installed
refrigerant piping. All split systems are shipped with a
dry nitrogen charge of 50 psig.
Refrigerant lines for the A/C unit are stubbed out
through the cabinet for connecting to the condenser/
condensing unit. The pipe stubs are labeled; i.e.
“Discharge”, “Suction”, “Liquid Line”. Split systems
coupled with a remote condenser will require a copper
liquid line and suction line. Systems utilizing a remote
condensing unit will require a copper liquid line and
discharge line. The following instructions should be
followed to ensure proper installation.
All refrigerant piping should be installed with high
temperature soldered joints. Use standard refrigeration
practices for piping supports, leak testing, dehydration
and charging of the refrigeration circuits. The refriger-
ant piping should be isolated from the building by the
use of vibration isolating supports. To prevent tube
damage when sealing openings in walls and to reduce
vibration transmission, use a soft flexible material to
pack around the tubing.
Oil traps must be included every 20 feet in vertical
risers and the refrigerant lines must be sloped ¼ inch
for every 10 feet in horizontal lines to ensure proper oil
return to the compressor.
Clear all pipe connections of debris and prepare
connections for soldering. Use only "L" or "K" grade
refrigerant copper tubing. Be careful not to allow
solder/piping debris to get inside refrigerant lines.
Silver solder containing a minimum of 15% silver is
recommended. Dry nitrogen should be flowing through
the tubing while soldering at a rate of not less than 1-2
CFM (0.03-0.06M
3
/minute).
Refrigerant lines for split systems must be sized
according to the piping distance between the A/C unit
and the condenser/condensing unit. Each valve, fitting
and bend in the refrigerant line must be considered in
this calculation. Refer to the following charts for
standard equivalent lengths, in feet, of straight pipe
and recommended line sizing:
Equivalent Length (ft) of Straight Pipe
OD (In.) Globe Angle 90º 45º Te e Te e
Line Size Valve Valve Elbow Elbow Line Branch
1/2 9.0 5.0 0.9 0.4 0.6 2.0
5/8 12 6.0 1.0 0.5 0.8 2.5
7/8 15 8.0 1.5 0.7 1.0 3.5
1 1/8 22 12 1.8 0.9 1.5 4.5
1 3/8 28 15 2.4 1.2 1.8 6.0
1 5/8 35 17 2.8 1.4 2.0 7.0
2 1/8 45 22 3.9 1.8 3.0 10
2 5/8 51 26 4.6 2.2 3.5 12
3 1/8 65 34 5.5 2.7 4.5 15
3 5/8 80 40 6.5 3.0 5.0 17
Recommended Liquid Line Sizes
(For R22 or R407C Refrigerant)
Model No./ Receiver to Evaporator (Equivalent Ft.*)
Total Unit 50' 100' 150'
BTU/Hr Capacity or less or less or less
018 / 18,000 3/8 3/8 1/2
024 / 24,000 3/8 1/2 1/2
036 / 36,000 1/2 1/2 1/2
042 / 42,000 1/2 5/8 5/8
048 / 48,000 1/2 5/8 5/8
060 / 60,000 1/2 5/8 5/8
*
Equivalent Ft. accounts for the linear pipe length as well as equivalent
length of Valves, Elbows and Tee’s shown in the previous chart.