Carrier 50HJQ004-016 Product Data page 169

(2.) 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 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). 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 mechanically bonded to copper tubes.
(3.) 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). 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 polymer strip shall prevent
coil assembly from contacting sheet metal coil pan
to maintain coating integrity and minimize corrosion
potential between coil and pan.
(4.) Optional pre-coated aluminum-fin coils shall have a
durable epoxy-phenolic
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 galvanic
action between dissimilar metals.
6. Heating Section:
a. May be equipped with field-installed electric resistance
heater(s) of the characteristics shown in the equipment
schedule.
b. Heater elements shall be open wire, adequately supported
and insulated with ceramic bushings.
7. Refrigerant Components:
Refrigerant circuit components shall include:
a. Fixed orifice metering system (Acutrol
b. Refrigerant filter drier.
c. Reversing valve.
d. Service gauge connections on suction, discharge, and
liquid lines.
8. Filter Section:
a. Standard filter section shall consist of factory-installed,
low velocity, throwaway 2-in. thick fiberglass filters of
commercially available sizes.
coating to provide
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b. Filter face velocity shall not exceed 320 fpm at nominal
airflows.
c. Filter section should use only one size filter.
d. Filters shall be accessible through an access panel with
"no-tool" removal.
9. Controls and Safeties:
a. 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).
b. Safeties:
(1.) Unit shall incorporate a solid-state compressor
protector which provides anti-cycle reset capability
at the space thermostat, should any of the following
standard safety devices trip and shut off compressor.
- -Compressor overtemperature, overcurrent.
- -Loss-of-charge/low-pressure switch.
- -Freeze-protection thermostat, evaporator coil.
- -High-pressure switch.
- -Automatic reset motor thermal overload protector.
The lockout protection shall be easily disconnected
at the control board, if necessary.
(2.) Heating section shall be provided with the following
minimum protections:
- -High-temperature limit switches.
- -Overcurrent protection.
(3.) Unit shall incorporate an outdoor coil defrost system
to prevent excessive frost accumulation during
heating duty, and shall be controlled as follows:
- -Defrost shall be initiated on the basis of time and coil
temperature.
- -A 30/50/90-minute timer shall activate defrost cycle
only if the coil temperature is low enough to indicate
a heavy frost condition.
- -Defrost cycle shall terminate when defrost
thermostats are satisfied and shall have a positive
termination time of 10 minutes.
10. Operating Characteristics:
a. Unit shall be capable of starting and running at 125_F
ambient outdoor temperature, meeting maximum load
criteria of ARI Standard 210/240 or 360 at + 10%
voltage.
b. Compressor with standard controls shall be capable of
operation down to 25_F (in cooling mode) ambient
outdoor temperature.
c. Compressor with standard controls shall be capable of
operation down to –20_F (in heating mode) ambient
outdoor temperature.
d. Unit shall be capable of simultaneous heating duty and
defrost cycle operation when using accessory electric
heaters.
11. Electrical Requirements:
All unit power wiring shall enter unit cabinet at a single
factory-predrilled location.
12. Motors:
a. Compressor motors shall be cooled by refrigerant gas
passing through motor windings and shall have line break
thermal and current overload protection.
b. Indoor-fan motor shall have permanently lubricated
bearings and inherent automatic-reset thermal overload
protection.
c. Totally enclosed outdoor-fan motor shall have
permanently lubricated
automatic-reset thermal overload protection.
bearings, and inherent