Carrier WEATHERMASTER 50HJQ004-016 Product Data page 149

3. On dual electrically and mechanically indepen-
dent circuits (008,012).
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. Testing:
a. Evaporator and condenser coils shall be
qualified to UL 1995 burst test at 2,200 psi.
b. Evaporator and condenser coils shall be leak
tested to 150 psig and pressure tested to
400 psig.
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.
c. E-Coated copper-fin coils shall have a flexible
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 resistance shall be
up to 160 in.-lb (ASTM D2794-93). Humid-
ity and water immersion resistance shall be up
to minimum 1000 and 250 hours respec-
tively (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 construc-
tion shall be copper fins mechanically bonded
to copper tubes with copper tube sheets. Gal-
vanized steel tube sheets shall not be accept-
able. A polymer strip shall prevent coil
assembly from contacting sheet metal coil
pan to maintain coating integrity and mini-
mize 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 minimum 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 system (Acutrol
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.
4. Filters shall be accessible through an access
panel with "no-tool" removal.
I. Controls and Safeties:
1. Unit Controls:
Unit shall be complete with self-contained low-
voltage control circuit protected by a fuse on
the 24-v transformer side (008-012 units have
a resettable circuit breaker).
TM device).
149