commercial use rooftop air conditioner unit

Features- commercial use rooftop air conditioner unit

Anti-Short Cycle Timer
Provides a 3-minute minimum ON time and 3-minute OFF time for compressors to enhance
compressor reliability by assuring proper oil return.
Colored and Numbered Wiring
Save time and money tracing wires and diagnosing the unit.
Belt Drive Motors (Three-phase)
For additional static requirements, Precedent™ three-phase belt
drive motors offer capability for a wide range of airflow needs.
Compressors
Precedent contains the best compressor technology available to

achieve the highest possible performance.
Dual compressors are outstanding for humidity control, light load cooling
conditions, and system back-up applications. Dual compressors are available on 8½ to 10 ton models.
Condenser Coil
Precedent boasts a patent-pending 1+1+1condenser coil, permanently gapped for easy cleaning.

Controls—ReliaTel™
ReliaTel microprocessor controls provide unit control for heating, cooling and ventilating utilizing
input from sensors that measure indoor and outdoor temperature and other zone sensors. ReliaTel
also provides outputs for building automation systems and expanded diagnostics. For a complete
list of ReliaTel offerings, refer to the “Other Benefits” section within the Features and Benefits
section of this catalog.
Crankcase Heaters
These band heaters provide improved compressor reliability by warming the oil to prevent
migration during off-cycles or low ambient conditions.
Discharge Line Temperature Switch
This feature is standard on all units.
Heat Exchanger
The compact cabinet features a progressive tubular heat exchanger in low, medium and high heat
capacities.
The heat exchanger is fabricated using stainless steel burners and corrosion-resistant, aluminized
steel tubes as standard on all models. It has an induced draft blower to pull the gas mixture through
the burner tubes. The heater has a direct spark ignition system which doubles as a safety device
to prove the flame.
Convertible Units
The units ship in a downflow configuration. They can be easily converted to horizontal by simply moving two panels.
Units come complete with horizontal duct flanges, so the contractor doesn’t have to field fabricate them. These duct
flanges are a time and cost saver.
Dual Sloped Drain Pans
Every Precedent™ unit has a non-corrosive, removable,
double-sloped drain pan

that is easy to clean and reversible toallow installation of drain trap on either side of the unit.

Easy Access Low Voltage Terminal Board 
Precedent’s Low Voltage Terminal Board is external to the electrical control cabinet. It is extremely
easy to locate and attach the thermostat wire and test operation of all unit functions. This is another
cost and time saving installation feature.
Foil Faced Insulation

All panels in the evaporator section of the unit have cleanable foil-faced insulation. All edges
are either captured or sealed to ensure no insulation fibers get into the airstream

Low Voltage Connections
The wiring of the low voltage connections to the unit and the zone sensors is as simple as 1-1, 2-2, and 3-3. This
simplified system makes it easy for the installer to wire.

General data—5 to 10 tons cooling and gas/electric, standard efficiency- commercial use rooftop air conditioner unit

(a) Cooling performance is rated at 35°C (95°F) ambient, 27°C (80°F) entering dry bulb, 19°C (67°F) entering wet bulb. Gross capacity does not include
the effect of fan motor heat. Net capacity includes the effect of fan motor heat. Units are suitable for operation to ±20% of nominal cfm. Units are
certified in accordance with the Unitary Air-Conditioner Equipment certification program, which is based on ARI Standard 210/240 or 340/360, depending
below or above 19,000 W (65,000 Btu/h).
(b)EER is rated at ARI conditions.
(c) Outdoor Sound Rating shown is tested in accordance with ARI Standard 270. For more information refer to Performance Data Table “Sound Power Level”.
(d)Optional 2" MERV 8 and MERV 13 filters also available.
(e) Refrigerant charge is an approximate value. For a more precise value, see unit nameplate and service instructions.
(f) Heating performance limit settings and rating data were established and approved under laboratory test conditions using American National Standards
Institute standards. Ratings shown are for elevations up to 2000 feet. For elevations above 2000 feet, ratings should be reduced at the rate of 4% for
each 1000 feet above sea level. Applicable to Gas/Electric units only.

Dimensional Data- commercial use rooftop air conditioner unit

Figure 1. Cooling and gas/electric—5 tons standard efficiency
Notes:
1. All dimensions are in inches/millimeters.
2. ½ NPT Gas Connection = (Y_C Models only)

Engineer available to service machinery overseas

Quality assurance lifetime:

• lifetime of outdoor units:  30 years 
• lifetime of parts:  18 mons-3 years
• Construction project lifetime:  6 mons