Carrier WeatherMaker 48TC Series Product Data page 93

b. Evaporator coils shall be leak tested to 150 psig, pressure tested to 450 psig, and qualified to UL 1995 burst
test at 1775 psig.
c. Condenser coils shall be leak tested to 150 psig, pressure tested to 650 psig, and qualified to UL 1995 burst
test at 1980 psig.
2. Optional Pre- - coated aluminum- - fin condenser coils (3 Phase Models Only):
a. Shall have a durable epoxy- - phenolic coating to provide protection in mildly corrosive coastal environ-
ments.
b. Coating shall be applied to the aluminum fin stock prior to the fin stamping process to create an inert barri-
er between the aluminum fin and copper tube.
c. Epoxy- - phenolic barrier shall minimize galvanic action between dissimilar metals.
3. Optional Copper- - fin evaporator and condenser coils (3 Phase Models Only):
a. Shall be constructed of copper fins mechanically bonded to copper tubes and copper tube sheets.
b. Galvanized steel tube sheets shall not be acceptable.
c. A polymer strip shall prevent coil assembly from contacting the sheet metal coil pan to minimize potential
for galvanic corrosion between coil and pan.
4. Optional E- - coated aluminum- - fin evaporator and condenser coils (3 Phase Models Only):
a. Shall have a flexible epoxy polymer coating uniformly applied to all coil surface areas without material
bridging between fins.
b. Coating process shall ensure complete coil encapsulation of tubes, fins and headers.
c. Color shall be high gloss black with gloss per ASTM D523- - 89.
d. Uniform dry film thickness from 0.8 to 1.2 mil on all surface areas including fin edges.
e. Superior hardness characteristics of 2H per ASTM D3363- - 92A and cross- - hatch adhesion of 4B- - 5B per
ASTM D3359- - 93.
f. Impact resistance shall be up to 160 in.- - lb (ASTM D2794- - 93).
g. Humidity and water immersion resistance shall be up to minimum 1000 and 250 hours respectively (ASTM
D2247- - 92 and ASTM D870- - 92).
h. Corrosion durability shall be confirmed through testing to be no less than 1000 hours salt spray per ASTM
B117- - 90.
5. Standard All Aluminum Novation Coils:
a. Standard condenser coils shall have all aluminum NOVATION Heat Exchanger Technology design consist-
ing of aluminum multi port flat tube design and aluminum fin. Coils shall be a furnace brazed design and
contain epoxy lined shrink wrap on all aluminum to copper connections.
b. Condenser coils shall be leak tested to 150 psig, pressure tested to 650 psig, and qualified to UL 1995 burst
test at 1980 psig.
6. Optional E- - coated aluminum- - fin, aluminum tube condenser coils:
a. Shall have a flexible epoxy polymer coating uniformly applied to all coil external surface areas without
material bridging between fins or louvers.
b. Coating process shall ensure complete coil encapsulation, including all exposed fin edges.
c. E- - coat thickness of 0.8 to 1.2 mil with top coat having a uniform dry film thickness from 1.0 to 2.0 mil on
all external coil surface areas, including fin edges, shall be provided.
d. Shall have superior hardness characteristics of 2H per ASTM D3363- - 00 and cross- - hatch adhesion of
4B- - 5B per ASTM D3359- - 02.
e. Shall have superior impact resistance with no cracking, chipping or peeling per NSF/ANSI 51- - 2002 Method
10.2.
23 81 19.13.K. Refrigerant Components
1. Refrigerant circuit shall include the following control, safety, and maintenance features:
a. Fixed orifice metering system shall prevent mal- - distribution of two- - phase refrigerant by including multiple
fixed orifice devices in each refrigeration circuit. Each orifice is to be optimized to the coil circuit it serves.
b. Refrigerant filter drier - - Solid core design.
c. Service gauge connections on suction and discharge lines.
d. Pressure gauge access through a specially designed access port in the top panel of the unit.
2. There shall be gauge line access port in the skin of the rooftop, covered by a black, removable plug.
a. The plug shall be easy to remove and replace.
b. When the plug is removed, the gauge access port shall enable maintenance personnel to route their pressure
gauge lines.
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