Carrier WEATHERMASTER 50HJQ004-016 Product Data page 155

3. Outdoor fan shall be of the direct-driven (with
totally enclosed motors) propeller type and shall
discharge air vertically.
4. Outdoor fan shall have aluminum blades riveted
to corrosion-resistant steel spiders and shall be
dynamically balanced.
D. Compressor(s):
1. Reciprocating semi-hermetic compressors with
factory-installed crankcase heaters.
2. Factory mounted on rubber grommets and
internally spring
isolation.
3. On independent circuits (016).
4. The size 014 unit semi-hermetic compressor
shall be equipped with an electric unloader for
capacity control.
E. Coils:
1. Standard indoor and outdoor coils shall have
copper or aluminum plate fins mechanically
bonded to seamless internally grooved copper
tubes with all joints brazed.
2. Coils shall be leak tested at 150 psig
(1034 kPa) and pressure tested at 450 psig
(3103 kPa).
3. Coils:
a. Copper-fin coils shall be constructed of cop-
per fins mechanically bonded to copper
tubes and copper tube sheets. Galvanized
steel tube sheets shall not be acceptable. A
polymer strip shall prevent coil assembly
from contacting the sheet metal coil pan to
minimize potential for galvanic corrosion
between coil and pan. All copper construc-
tion shall provide protection in moderate
coastal environments.
b. E-Coated aluminum-fin coils shall have a
flexible epoxy polymer coating uniformly
applied to all coil surface areas without
material bridging between fins. Coating pro-
cess shall ensure complete coil encapsula-
tion. Color shall be high gloss black with
gloss — 60 deg of 65 to 90% per ASTM
D523-89. Uniform dry film thickness from
0.8 to 1.2 mil on all surface areas including
fin edges. Superior hardness characteristics
of 2H per ASTM D3363-92A and cross-
hatch adhesion of 4B-5B per ASTM
D3359-93. Impact resistance shall be up to
160 in.-lb (ASTM D2794-93). Humidity and
water immersion resistance shall be up to
minimum 1000 and 250 hours respectively
(ASTM D2247-92 and ASTM D870-92).
Corrosion durability shall be confirmed
through testing to be no less than 1000
hours salt spray per ASTM B117-90. Coil
construction shall be aluminum fins mechan-
ically bonded to copper tubes.
mounted for vibration
c. E-Coated copper-fin coils shall have a flexi-
ble epoxy polymer coating uniformly applied
to all coil surface areas without material
bridging between fins. Coating process shall
ensure complete coil encapsulation. Color
shall be high gloss black with gloss — 60 deg
of 65 to 90% per ASTM D523-89. Uniform
dry film thickness from 0.8 to 1.2 mil on all
surface areas including fin edges. Superior
hardness characteristics of 2H per ASTM
D3363-92A and cross-hatch adhesion of
4B-5B per ASTM D3359-93. Impact resis-
tance shall be up to 160 in.-lb (ASTM
D2794-93). Humidity and water immersion
resistance shall be up to minimum 1000 and
250 hours respectively (ASTM D2247-92
and ASTM D870-92). Corrosion durability
shall be confirmed through testing to be no
less than 1000 hours salt spray per ASTM
B117-90. Coil construction shall be copper
fins mechanically bonded to copper tubes
with copper tube sheets. Galvanized steel
tube sheets shall not be acceptable. A poly-
mer strip shall prevent coil assembly from
contacting sheet metal coil pan to maintain
coating integrity and minimize corrosion
potential between coil and pan.
d. Optional pre-coated aluminum-fin coils shall
have a durable epoxy-phenolic coating to
provide protection in mildly corrosive coastal
environments. Coating shall be applied to
the aluminum fin stock prior to the fin
stamping process to create an inert barrier
between the aluminum fin and copper tube.
Epoxy-phenolic barrier shall minimize gal-
vanic action between dissimilar metals.
F. Heating Section:
1. May be equipped with field-installed electric
resistance heater(s) of the characteristics shown
in the equipment schedule.
2. Heater elements shall be open wire, adequately
supported and insulated with ceramic bushings.
G. Refrigerant Components:
Refrigerant circuit components shall include:
1. Fixed orifice metering
device).
2. Refrigerant filter drier.
3. Reversing valve.
4. Service gage connections on suction, discharge,
and liquid lines.
H. Filter Section:
1. Standard filter section shall consist of factory-
installed, low velocity, throwaway 2-in. thick
fiberglass filters of commercially available sizes.
2. Filter face velocity shall not exceed 320 fpm at
nominal airflows.
3. Filter section should use only one size filter.
system (Acutrol TM
155