Product Data - Carrier
Product Data - Carrier
Product Data - Carrier
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Guide specifications — 48TJ004-014<br />
Packaged Rooftop Electric Cooling<br />
Unit with Gas Heat — Constant Volume<br />
Application<br />
HVAC Guide Specifications<br />
Size Range: 3to121 ⁄2Tons, Nominal (Cooling)<br />
72,000 to 250,000 Btuh, Nominal<br />
(Input Heating)<br />
<strong>Carrier</strong> Model Numbers: 48TJD,<br />
48TJE,<br />
48TJF<br />
Part 1 — General<br />
1.01 SYSTEM DESCRIPTION<br />
A. Outdoor rooftop mounted, electrically-controlled heating<br />
and cooling unit utilizing a hermetic compressor(s)<br />
for cooling duty and gas combustion for heating duty.<br />
Unit shall discharge supply air vertically or horizontally<br />
as shown on contract drawings.<br />
1.02 QUALITY ASSURANCE<br />
A. Unit shall be rated in accordance with ARI Standards<br />
210/240 or 360 and 270. Designed in accordance<br />
with UL Standard 1995.<br />
B. Unit shall be designed to conform to ASHRAE 15,<br />
latest revision.<br />
C. Unit shall be UL-tested and certified in accordance<br />
with ANSI Z21.47 Standards and UL listed and certified<br />
under Canadian standards as a total package for<br />
safety requirements.<br />
D. Roof curb shall be designed to conform to NRCA<br />
Standards.<br />
E. Insulation and adhesive shall meet NFPA 90A requirements<br />
for flame spread and smoke generation.<br />
F. Unit casing shall be capable of withstanding Federal<br />
Test Method Standard No. 141 (Method 6061)<br />
500-hour salt spray test.<br />
G. Unit shall be designed in accordance with ISO 9001,<br />
and shall be mainufactured in a facility registered to<br />
ISO 9002/BS5750, Part 2.<br />
1.03 DELIVERY, STORAGE, AND HANDLING<br />
A. Unit shall be stored and handled per manufacturer’s<br />
recommendations.<br />
Part2—<strong>Product</strong>s<br />
2.01 EQUIPMENT (STANDARD)<br />
A. General:<br />
Factory assembled, single-piece heating and cooling<br />
unit. Contained within the unit enclosure shall be all<br />
factory wiring, piping, controls, refrigerant charge<br />
(R-22), and special features required prior to field<br />
start-up.<br />
B. Unit Cabinet:<br />
1. Unit cabinet shall be constructed of galvanized steel,<br />
and shall be bonderized and coated with a prepainted<br />
baked enamel finish on all externally exposed<br />
surfaces.<br />
66<br />
2. Evaporator fan compartment interior cabinet surfaces<br />
shall be insulated with a minimum 1 ⁄2-in. thick,<br />
flexible fiberglass insulation, coated on the air side.<br />
Aluminum foil-faced fiberglass insulation shall be<br />
used in the gas heat compartment.<br />
3. Cabinet panels shall be easily removable for<br />
servicing.<br />
4. Holes shall be provided in the base rails for rigging<br />
shackles to facilitate maneuvering and overhead<br />
rigging.<br />
5. Unit shall have a factory-installed, sloped condensate<br />
drain pan made of a non-corrosive material,<br />
providing a minimum 3 ⁄4-in. connection with both<br />
vertical and horizontal drains, and shall comply with<br />
ASHRAE Standard 62.<br />
6. Unit shall have a factory-installed filter access panel<br />
to provide filter access with tool-less removal.<br />
7. Unit shall have standard thru-the-bottom power<br />
connection capability.<br />
C. Fans:<br />
1. Evaporator Fan:<br />
a. Fan shall be direct or belt driven as shown<br />
on the equipment drawings. Belt drive shall<br />
include an adjustable-pitch motor pulley.<br />
b. Fan wheel shall be double-inlet type with<br />
forward-curved blades.<br />
c. Bearings shall be sealed, permanently lubricated<br />
ball-bearing type for longer life and<br />
lower maintenance.<br />
2. Evaporator fan shall be made from steel with a<br />
corrosion-resistant finish and shall be dynamically<br />
balanced.<br />
3. Condenser fan shall be of the direct-driven propeller<br />
type and shall discharge air vertically.<br />
4. Condenser fan shall have aluminum blades riveted<br />
to corrosion-resistant steel spiders and shall be dynamically<br />
balanced.<br />
5. Induced-draft blower shall be of the direct-driven,<br />
single inlet, forward-curved centrifugal type, made<br />
from steel with a corrosion-resistant finish and shall<br />
be dynamically balanced.<br />
D. Compressor(s):<br />
1. Fully hermetic type, internally protected.<br />
2. Factory spring-shock mounted and internally spring<br />
mounted for vibration isolation.<br />
3. On independent mounting circuits (008-014).<br />
E. Coils:<br />
1. Evaporator and condenser coils shall have aluminum<br />
plate fins mechanically bonded to copper tubes<br />
with all joints brazed.<br />
2. Tube sheet openings shall be belled to prevent tube<br />
wear.<br />
3. Evaporator coil shall be of the full face active<br />
design.
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