Specifications

GUIDE SPECIFICATIONS — 538B,D OUTDOOR UNITS
COMMERCIAL HEAT PUMP UNITS
HVAC GUIDE SPECIFICATIONS
SIZE RANGE:
3
⁄ 4 TO 5 TONS COOLING CAPACITY
9000 TO 57,500 BTUH HEATING CAPACITY
MODEL NUMBER: 538B,D
PART 1 — GENERAL
1.01 SYSTEM DESCRIPTION
A. Outdoor-mounted, air-cooled split system outdoor section
suitable for on-the-ground, rooftop, wall hung, balcony, or
under-deck installation. Unit shall consist of a hermetic re-
ciprocating, scroll, or rotary compressor, an air-cooled
coil, propeller-type blow-thru outdoor fans, reversing
valve, accumulator, holding refrigerant charge (full charge
for 538D009,012), heating mode metering device, and
control box. Unit shall discharge air horizontally as shown
on the contract drawings. Units shall function as the out-
door component of an air-to-air cooling and heating
system.
B. Units shall be used in a refrigeration circuit matched to a
duct-free cooling fan coil unit or an approved ducted cool-
ing fan coil unit.
1.02 QUALITY ASSURANCE
A. Unit construction shall comply with ANSI/ASHRAE 15, lat-
est revision, and with the NEC.
B. Units shall be constructed in accordance with UL
standards.
C. Units shall be listed in the CEC directory.
D. Unit cabinet shall be capable of withstanding Federal Test
Standard No. 141 (method 6061) 500-hour salt spray test.
E. Air-cooled condenser coils shall be leak tested at
350 psig air pressure with the coil submerged in
water.
1.03 DELIVERY, STORAGE, AND HANDLING
Units shall be shipped in one piece and shall be
stored and handled per unit manufacturer’s
recommendations.
1.04 WARRANTY (For Inclusion By Specifying Engineer).
PART 2 — PRODUCTS
2.01 EQUIPMENT
A. General:
Factory assembled, single piece, air-cooled outdoor unit.
Contained within the unit enclosure shall be all factory
wiring, piping, controls, compressor, full (538D009,012)
or holding (538D018,024 and 538B) charge of R-22 re-
frigerant, and special features required prior to field start-
up.
B. Unit Cabinet:
1. Unit cabinet shall be constructed of galvanized steel,
bonderized and coated with a baked-enamel finish.
2. Unit access panels shall be removable with minimal
screws and shall provide full access to the compres-
sor, fan, and control components.
3. Outdoor compartment shall be isolated and have an
acoustic lining to assure quiet operation.
C. Fans:
1. Outdoor fans shall be direct-drive propeller type, and
shall discharge air horizontally. Fans shall blow air
through the outdoor coil (538D018,024 and 538B
only).
2. Outdoor fan motors shall be totally-enclosed, single-
phase motors with class B insulation and
permanently-lubricated sleeve bearings. Motor shall
be protected by internal thermal overload protection.
3. Shaft shall have inherent corrosion resistance.
4. Fan blades shall be corrosion resistant and shall be
statically and dynamically balanced.
5. Outdoor fan openings shall be equipped with PVC
coated protection grille over fan and coil.
D. Compressor:
1. Compressor shall be fully hermetic reciprocating or
scroll type.
2. Compressor shall be equipped with oil system, op-
erating oil charge, and motor. Internal overloads shall
protect the compressor from overtemperature and
overcurrent. Scroll compressors shall also have high
discharge gas temperature protection if required.
3. Motor shall be NEMA rated class F, suitable for opera-
tion in a refrigerant atmosphere.
4. Reciprocating compressors shall be equipped with
crankcase heaters to minimize liquid refrigerant accu-
mulation in compressor during shutdown and to pre-
vent refrigerant dilution of oil.
5. Compressor assembly shall be installed on rubber
vibration isolators and shall have internal spring
isolation.
6. Compressors shall be single phase or 3-phase as
specified on the contract drawings.
E. Outdoor Coil:
Coil shall be constructed of aluminum fins mechanically
bonded to internally enhanced, seamless copper tubes
which are cleaned, dehydrated, and sealed.
F. Refrigeration Components:
Refrigerant circuit components shall include brass exter-
nal liquid line service valve with service gage port connec-
tions, suction line service valve with service gage
connection port, service gage port connections on com-
pressor suction and discharge lines with Schrader-type
fittings with brass caps, accumulator, bi-flow filter drier,
pressure relief, reversing valve, and heating mode meter-
ing device.
G. Controls and Safeties:
Operating controls and safeties shall be factory selected,
assembled, and tested. The minimum control functions
shall include the following:
1. Controls:
a. Time delay restart to prevent compressor reverse
rotation on single-phase scroll compressors.
b. Automatic restart on power failure.
c. Safety lockout if any outdoor unit safety is open.
d. A time delay control sequence is also provided
standard through the fan coil board, thermostat,
or controller.
e. High-pressure and liquid line low-pressure
switches.
f. Automatic outdoor-fan motor protection.
g. Start capacitor and relay (single-phase units with-
out scroll compressors).
82