Carrier WEATHERMAKER 39B - Direct-Expansion Coil Details; Refrigerant Distributor Nozzle Selection

OUTDOOR UNITS ~ Not recommended for 4. Caulk all joints with nonhardening material
standard units unless following precautions are such as butyl-rubber or silicone-rubber to pre-
taken into consideration. Consult your local vent moisture infiltration.
Carrier representative for units specially factory 5. Install a field-supplied rain shield over outside
equipped for outdoor use. air damper of combination mixing box and
1. Externally insulate all accessories that are not filter section.
factory insulated (combination mixing box and
filter section, filter section, and face and bypass
damper section).
(Fig. 13) can be used as an alternate.
Obtain motor manufacturer’s recommendation
for a fan motor type suitable for outdoor use.
7. Install a field-supplied cover over damper link-
. If outside temperature will be below dew point age to prevent ice and snow from interfering
of air in unit at any time during operating with operation. Damper motor must be suitable
season, insulate complete unit externally to for outdoor use.
prevent internal condensation. Vapor seal and mp А ;
; : 8. If unit is to be subjected to freezing tempera-
weatherproof insulation. : “be
tures, insulate condensate drain lines and locate
. Install a crowned waterproof cover on top of trap indoors to prevent freeze-up.
unit to prevent water from collecting or leaking À f 39B. 39C
into unit per Fig.12. A shed-type cover 9. For coil freeze-up protection, refer to ‚3
Operation and Maintenance Book.
Piping — Coil connections are labeled on unit.
GENERAL
1. Pipe unit so that vibration is not transmitted to
or from unit.
2. Allow sufficient clearance for unit piping
connections so that piping will not prevent
removal of fan belt guard.
3, All piping must follow standard piping tech-
niques. Refer to Carrier System Design Manual
for details.
Fig.
12
—
Crowned-Type
Protection
Cover
—
NG
CO
Field-Supplied
Refrigerant Distributor Nozzles
1. Check refrigerant distributor nozzle against
design load and note following:
a. Nozzles installed are for minimum rec-
ommended coil loading for proper refrig-
erant distribution and oil return. For heavier
loads, proper nozzles must be substituted.
b. Nozzle orifice size is stamped on nozzle.
Refer to Table5 for factory-installed
standard coil nozzles. Refer to Table 6 for
nozzle orifice capacities.
Field-Supplied
Table 5 — Factory-Installed Refrigerant Distributor Nozzles — Standard Direct-Expansion Coils
Size Coils
In Unit
Qty-Size |4- And
Nozzles
In Coil
1-G2 1-63 |1-64 | 1-C4 |1-С5 |2-C5 |2-C6 |2-C5 |2-C6 |2-A10|2-C5 |2-C5 |2-C6 |2-C5 |2-A10
15