Coils; Refrigerant Components - Carrier WeatherMaster 50HCQ Product Data

(2.) Optional, factory approved, watertight connection method must be used for thru- - the- - base electrical connec-
tions.
(3.) No basepan penetration, other than those authorized by the manufacturer, is permitted.
9. Component access panels (standard)
a. Cabinet panels shall be easily removable for servicing.
b. Unit shall have one factory- - installed, tool- - less, removable, filter access panel.
c. Panels covering control box, indoor fan, indoor fan motor, gas components (where applicable), and com-
pressors shall have molded composite handles.
d. Handles shall be UV modified, composite. permanently attached, and recessed into the panel.
e. Screws on the vertical portion of all removable access panels shall engage into heat resistant, molded compos-
ite collars.
f. Collars shall be removable and easily replaceable using manufacturer recommended parts.
23 81 19.13.I. N/A
23 81 19.13.J.

Coils

1. Standard Aluminum/Copper Coils: on all models.
a. Standard evaporator and condenser coils shall have aluminum lanced plate fins mechanically bonded to seam-
less internally grooved copper tubes with all joints brazed.
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: on all models.
a. Shall have a durable epoxy- - phenolic coating to provide protection in mildly corrosive coastal environments.
b. 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.
c. Epoxy- - phenolic barrier shall minimize galvanic action between dissimilar metals.
3. Optional Copper- - fin evaporator and condenser coils: on all models.
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: on all models.
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.
23 81 19.13.K.

Refrigerant Components

1. Refrigerant circuit shall include the following control, safety, and maintenance features:
a. Thermostatic Expansion Valve (TXV) shall help provide optimum performance across the entire operating
range. Shall contain removable power element to allow change out of power element and bulb without remov-
ing the valve body.
b. Refrigerant filter drier on each refrigerant circuit.
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.
e. Suction line accumulator to provide protection in all operating modes from cooling, heating and reverse cycle
switching. Standard on each refrigerant circuit.
2. There shall be gauge line access port in the top of the rooftop, covered by a black, removable plug.
93