Bryant DURAPAC 551B - Manual (Page 166)

166
GUIDE SPECIFICTIONS — SIZES 155-300 (cont)
5. 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 encapsu-
lation. 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 characteris-
tics 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 mechani-
cally bonded to copper tubes.
6. 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 characteris-
tics 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 con-
tacting sheet metal coil pan to maintain coating integ-
rity and minimize corrosion potential between coil
and pan.
F. Refrigerant Components:
Refrigerant circuit components shall include:
1. Thermostatic expansion valve (TXV).
2. Filter driers.
3. Gage port and connections on suction, discharge,
and liquid lines.
G. Filter Section:
Standard filter section shall consist of 2 sizes of factory-
installed 2-in. (51 mm) thick throwaway fiberglass filters of
commercially available sizes.
H. Controls and Safeties:
1. Unit Controls:
a. Economizer control (optional)
b. Capacity control (2-step)
c. Unit shall be complete with self-contained low-
voltage control circuit.
2. Safeties:
a. Unit shall incorporate a solid-state compressor
lockout which provides reset capability at the
space thermostat, should any of the following
safety devices trip and shut off compressor:
1) Compressor lockout protection provided for
either internal or external overload.
2) Low-pressure switch.
3) Dual freezestats (evaporator coil).
4) High-pressure switch.
b. Supply-air thermostat shall be located in the unit.
c. Heating section shall be provided with high-
temperature limit switch.
I. Operating Characteristics:
1. Unit shall be capable of starting and running at 125 F
ambient outdoor temperature per maximum load cri-
teria of ARI Standard 360.
2. Unit with standard controls will operate in cooling
down to an outdoor ambient temperature of 40 F
(4.4 C).
3. Unit shall be provided with fan time delay to prevent
cold air delivery.
J. Electrical Requirements:
All unit power wiring shall enter unit cabinet at a single
location.
K. Motors:
1. Compressor motors shall be cooled by refrigerant
gas passing through motor windings and shall have
line break thermal and current overload protection.
2. All fan motors shall have permanently lubricated,
sealed bearings and inherent automatic-reset ther-
mal overload protection or manual reset calibrated
circuit breakers.
3. All indoor-fan motors 5 hp and larger shall meet the
minimum efficiency requirements as established by
the Energy Policy Act of 1992 (EPACT) effective
October 24, 1997.
L. Special Features:
Certain features are not applicable when the features
designated * are specified. For assistance in amending
the specifications, contact your local Bryant Sales Office.
1. Roof Curbs (Horizontal and Vertical):
a. Formed of 16-gage galvanized steel with wood
nailer strip and shall be capable of supporting
entire unit weight.
b. Permits installing and securing ductwork to curb
prior to mounting unit on the curb.
2. Horizontal Adapter Roof Curb:
Includes factory-assembled adapter and internal
duct and substantially improves evaporator fan static
performance (static regain).
NOTE: Power exhaust or barometric relief must be
mounted in the return ductwork when used in con-
junction with this accessory.
* 3. Integrated Economizer:
a. Integrated type capable of simultaneous econo-
mizer and compressor operation to provide
mechanical cooling while using outdoor air.
b. Equipped with low-leakage parallel blade, gear
driven dampers not to exceed 2% leakage, at
1.0 in. wg (249 Pa) pressure differential.
c. Actuator motor is 24-v, 53 lb torque spring return
direct coupled type design (close on loss of
power).
5
51A
/5
58F
/5
59
F15
5
-300