Carrier WEATHERMASTER 50HJQ004-016 Product Data page 148

Guide specifications — 50HJQ004-012
Packaged Rooftop Air-to-Air Heat Pump —
Constant Volume Application
HVAC Guide Specifications
→
Size Range: 3 to 10 Tons, Nominal (Cooling)
34,800 to 114,000 Btuh, Nominal
(Heating)
4 to 50 kW Nominal (Electric Heating)
Carrier Model Number: 50HJQ
Part 1 — General
1.01 SYSTEM DESCRIPTION
Outdoor rooftop mounted, electrically controlled air-
to-air heat pump unit utilizing a scroll compressor
for cooling duty and electric resistance coils for heat-
ing duty. Unit shall discharge supply air vertically or
horizontally as shown on contract drawings.
1.02 QUALITY ASSURANCE
A. Unit shall be rated in accordance with ARI
Standards 210/240 or 360 and 270. Designed in
accordance with UL Standard 1995. Units shall be
Energy Star qualified.
B. Unit shall be designed to conform to ASHRAE 15,
latest revision.
C. Unit shall be UL-tested and certified in accordance
with ANSI Z21.47 Standards and UL-listed and cer-
tified under Canadian standards as a total package
for safety requirements.
D. Roof curb shall be designed to conform to NRCA
Standards.
E. Insulation and adhesive shall meet NFPA 90A
requirements for flame spread and smoke generation.
F. Unit casing shall be capable of withstanding
500-hour salt spray exposure per ASTM B117
(scribed specimen).
G. Unit shall be designed in accordance with ISO
9001:2000, and shall be manufactured in a facility
registered to ISO 9001:2000.
H. Each unit shall be subjected to a completely auto-
mated run testing on the assembly line. Units con-
tain a factory-supplied printout indicating tested
pressures, amperages, data, and inspectors; provid-
ing certification of the unit status at the time of
manufacture.
1.03 DELIVERY, STORAGE, AND HANDLING
Unit shall be stored and handled per manufacturer's
recommendations.
Part 2 — Products
2.01 EQUIPMENT (STANDARD)
A. General:
Factory assembled, single-piece heat pump unit.
Contained within the unit enclosure shall be all
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factory wiring, piping, controls, refrigerant charge
(R-22), and special features required prior to field
start-up.
B. Unit Cabinet:
1. Unit cabinet shall be constructed of galvanized
steel, and shall be bonderized and coated with a
prepainted baked enamel finish on all externally
exposed surfaces.
2. Evaporator fan compartment interior cabinet
surfaces shall be insulated with a minimum
1 / -in. thick, 1 lb density, flexible fiberglass
2
insulation, neoprene coated on the air side.
Aluminum foil-faced fiberglass insulation shall
be used in the gas heat compartment.
3. Cabinet panels shall be easily removable for
servicing.
4. Holes shall be provided in the base rails for rig-
ging shackles to facilitate maneuvering and
overhead rigging.
5. Unit shall have a factory-installed, sloped con-
densate drain pan made of a non-corrosive
material, providing a minimum
connection with both vertical and horizontal
drains, and shall comply with ASHRAE Stan-
dard 62.
6. Unit shall have a factory-installed filter access
panel to provide filter access with tool-less
removal.
7. Unit shall have standard thru-the-bottom power
connection capability (accessory kit is required).
C. Fans:
1. Indoor Fan:
a. Fan shall be direct or belt driven as shown
on the equipment drawings. Belt drive shall
include an adjustable-pitch motor pulley.
b. Fan wheel shall be double-inlet type with
forward-curved blades.
c. Bearings shall be sealed, permanently
lubricated ball-bearing type for longer life
and lower maintenance.
2. Indoor fan shall be made from steel with a cor-
rosion-resistant finish and shall be dynamically
balanced.
3. Outdoor fan shall be of the direct-driven (with
totally enclosed motors) propeller type and shall
discharge air vertically.
4. Outdoor fan shall have aluminum blades riveted
to corrosion-resistant steel spiders and shall be
dynamically balanced.
D. Compressor(s):
1. Fully hermetic type, internally protected scroll-
type.
2. Factory mounted on rubber grommets and
internally spring
isolation.
904
3
/ -in-14 NPT
4
mounted for vibration