Carrier 39G handleiding
Handleiding
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9
8.0 REFRIGERANT PIPING, DIRECT
EXPANSION COILS
Direct expansion coils are split into 2, 4 or 8 splits
depending upon the unit size and coil circuiting. Each
split requires its own distributor nozzle, expansion
valve and suction piping. Suction connections are
on the entering side connections for each coil split
are on the air leaving side in the same order from
to bottom. Refer to example on (Fig. 11).
Fig. 11 Example Of Direct-Expansion Coil
Distributor And Suction Connections
CAUTION
Direct expansion coils are shipped pressurized with
dry air. Release pressure from each coil split through
valves in protective caps before removing caps. Do
not leave piping open to the atmosphere unnecessarily.
Water and water vapor are detrimental to the refrigerant
system. Until the piping is complete, recap the system
and charge with nitrogen at the end of each work-day.
Clean all piping connections before soldering joints.
The lower split of face split coils should be first on,
last off. Row split coils utilize special intertwined circuits:
either splits of these row split coils can be first on,
last off.
8.1 Suction Piping
Connect suction piping as shown in (Fig.12) for
face split coil or (Fig 13) for row split coil. Suction
line from coil connection to end of the 15-diameter-
long riser should be same tube size as coil connection
to ensure proper refrigerant velocity. Refer to
Carrier System Design Manual, Part 3, and size
remaining suction line header pressure drop
equivalent to approximately 2.5
0
F. Refer to Fig 15
for piping risers to the compressor.
To minimize the possibility of flooded starts and
compressor damage during prolonged shutdown,
install an accumulator in the suction line or a solenoid
in the liquid line of last-on, first-off split in row
applications.
Fig. 12 Face Split Coil Suction Line Piping
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Productinformatie
| Merk | Carrier |
| Model | 39G |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 3661 MB |
