50HJ Single-Package Rooftop Units Electric Cooling with Electric Heat Option
13 to 20 Nominal Tons
High-performance, single-package rooftop products with the following industry-leading premium features:
Cooling EERs up to 10.5
Serviceable semi-hermetic compressors
Service valves and full refrigeration system safeties
High-static oversized fan motors (standard)
Variable-pitch belt drive fan motors (standard)
TEMP system compatible Apollo electronic
controls (optional)
Features/Benefits Industry-leading
cooling EERs The 50HJ015 (13
tons) and 017 (15 tons) units provide leading ARI (Air Conditioning
and Refrigeration Institute) certified cooling EERs (Energy Efficiency
Ratios) of 10.5 and 10.3, respectively. The fully-rated 20-ton
50HJ025 has an EER of 9.3. These exceptionally high ratings assure
mini-mum operating costs and will qualify for attractive utility
rebates in many areas.
Semi-hermetic compressors: All
these 50HJ units use the Carlyle 06D semi-hermetic compressors.
These serviceable compressors are highly regarded, preferred by
owners and users, and are offered exclusively on the Carrier high-efficiency
13 to 20 ton HJ units.
High static oversized fan motors and
variable-pitch belt drives: The
50HJ units have oversized evaporator-fan motors and variable-pitch
belt drives supplied standard from the factory to provide up to
2 in. wg of external static pressure at 400 cfm per ton with wet
coils and clean filters installed.
Easy installation: The
50HJ 13 to 20 ton rooftop units are perfect for vertical supply
and return roof curb mount applications on new construction, retrofit,
and replacement applications. The compact physical size and weight
are not only advantages in terms of minimizing required roof structures
on new construction and retrofit jobs, but also make the 50HJ
the perfect replacement unit for any of the original Carrier 50DP,DR
012- 020 units installed in the late 1970s and early 1980s to
meet the upgraded job requirements of the 1990s. The new 50HJ
units can be easily converted to horizontal supply and return
with Carrier's new fan-performance- boosting, horizontal, high-static
regain.
Efficient operation, dependable performance:
Built with energy efficiency
in mind, the 50HJ cooling coils feature staggered copper tubes
and mechanically bonded aluminum fins to provide top efficiency.
A manual outdoor-air damper can be preset to admit up to 25% outdoor
air for year-round ventilation. Units equipped with economizer
have a thermostatically controlled, fully modulating damper which
admits up to 100% outdoor air and provides low-cost cooling. Temperature
control governs economizer cooling change-over to provide lowest
cost operation in mild weather. Condenser fans are direct driven,
factory-lubricated, and positioned for quiet, efficient vertical
discharge. High technology design techniques feature computer-programmed
balance between compressor, condenser, and evaporator. Carrier
specified semi-hermetic compressors are equipped with crankcase
heaters, calibrated circuit breakers for overcurrent protection,
and Cycle-LOC compressor protection. Electric heat and an
integrated economizer are accessories/options on all units. The
weather resistant cabinet is designed for durability under all
climatic conditions. The unit cabinet is made of Carrier Weather
Armor® galvanized steel, prepainted for long life and good
looks.