Carrier 39L handleiding
Handleiding
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47
Fig. 48 — Multiple Coil Low Pressure
Piping Gravity Return
Fig. 49 — Condensate Lift to Overhead Return
Refrigerant Piping, Direct-Expansion (DX) Coils
NOTE: For units that utilize R-454B or R-32, Installation of
pipe-work must be kept to a minimum, and that the pipe-work
shall be protected from physical damage. The following must
be adhered to:
1. Connecting joints shall only be made in easily accessible
locations for service purposes.
2. There shall be no bends in pipe-work lines with a centerline
bend radius less than 2.5 times the external diameter.
3. Be protected from potential damage during normal operation,
service or maintenance.
Direct-expansion coils are divided into 2 or 4 splits depending
upon the unit size and coil circuiting. See Tables 14, 15, and 16 for
coil circuiting data. Each split requires its own distributor nozzle,
expansion valve, and suction piping. Suction connections are on
the air entering side when the coil is properly installed. Matching
distributor connections for each coil split are on the air leaving
side. See unit label or certified drawing to assure connection to
matching suction and liquid connections. See Table
18 for distrib-
utor part numbers.
Fig. 50 — Typical Direct-Expansion
Row Split Coil
SUCTION PIPING
Connect suction piping as shown in Fig. 51 for face split coil or
Fig. 52 for row split coil.
Note 1
Unit
Unit
Dirt Leg (6 in.)
15 in. Check Valve
Float or Bucket
Trap (Note 4)
Note 1
Gate Valve
Condensate
Return
Open Air Relief
to Atmosphere
Thermostatic Trap
(1/2 in.)
15° Check Valve
for Breaking Vacuum
Steam Supply
Gate Valve
Strainer
Control Valve (Notes 2 & 3)
*
12 in.
min.
* When end of supply main, see Fig. 46.
NOTE(S):
1. Flange or union is located to facilitate coil removal.
2. When control valve is omitted on multiple coils in parallel air flow.
3. When a bypass with control is required.
4. Coils with different pressure drops require individual traps. This is often
caused by varying air velocities across the coil bank.
NOTE(S):
1. Flange or union is located to facilitate coil removal.
2. To prevent water hammer, drain coil before admitting steam.
3. Do not exceed one foot of lift between trap discharge and return main for
each pound of pressure differential.
4. Do not use this arrangement for units handling outside air.
Unit
Gate Valve
Note 1
Drain Valve
(Gate, Note 2)
12 in.
min.
Check Valve
Bucket Trap
(Located Below Coil Outlet)
Gate Valve
Overhead
Condensate
Return
Main
Steam Supply
Main
Note 1
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 workday. 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 (as
shown in Fig. 50); either split of these row split coils can be
first on, last off.
Suction
Connection
Circuit 1
Air Flow
Suction
Connection
Circuit 2
Distributer
Circuit 1
Distribute
r
Circuit 2
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Productinformatie
| Merk | Carrier |
| Model | 39L |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 14640 MB |
