Packaged rooftop heating, ventilating, and air-conditioning (HVAC) systems are found on the roofs of commercial and industrial buildings of all types and sizes. Single-packaged units can cover all the heating and cooling needs of a facility or they can be configured to handle cooling only. A packaged system contains all of the components found in larger HVAC configurations in a pre-assembled, self-contained unit. The advantages of these systems are their simplicity and lower installation cost.While packaged units are typically pre-assembled, they offer options which may be well-suited to the needs of your facility.Natural gas and electric heating options are available in packaged rooftop units. The choice between the two is based primarily on the cost of the unit, as well as operating and installation costs. Natural gas heating units typically have higher overall installation costs when gas piping is included, but are generally less expensive to operate. A gas condensing option is now available.

The added cost of piping natural gas to these units may be recovered quickly, depending on fuel costs and efficiency of the equipment.Commercial packaged rooftop cooling systems in the 5- to 30-ton range are often distributed in several locations along a rooftop, depending on the size of the building and the overall cooling load required. The efficiency of air-conditioning systems is measured using Energy Efficiency Rating (EER) and Seasonal Energy Efficiency Rating (SEER) metrics. A higher rating indicates a higher efficiency level. The most widely used energy-efficiency standard, ASHRAE 90.1-2010, recommends a minimum SEER rating of 13.0 for packaged units of 5 tons or less. Air-cooled units sized at 5 to 11 tons should have a minimum EER rating of 11.2, while 11.0 is recommended for systems ranging from 11 to 20 tons. For units over 20 tons, the minimum recommendation is 9.9 EER.Packaged units include a number of optional features for increasing performance and saving energy:For facilities with multiple packaged units, comfort zoning can improve overall efficiency and increase flexibility to tailor temperature setting for specific building areas.

A low-cost method for improving the efficiency of your current packaged rooftop unit is proper maintenance. These units are constantly exposed to the elements and their energy efficiency decreases over time if the coil and fan aren’t cleaned, the insulation degrades, the compressor wears and/or the overall system deteriorates. The following maintenance activities help to ensure optimum system performance:A year-round maintenance program can pay dividends. For example, a unit with a badly fouled coil might operate at an efficiency of 1.6 kW per ton, rather than the designed 1.3 kW. For a 20-ton unit, that dirty coil could increase energy costs as much as $250 per month or more. To clean, soap and water will work if done regularly. You might also consider installing an ultraviolet light to help keep the coil clean between scheduled maintenance visits. ASHRAE Standard 180 offers checklists for maintenance tasks of rooftop units.When installing a new packaged system, size the unit to fit your current needs rather than matching the old design.

Cooling systems are often oversized for a number of reasons:Oversized equipment is more expensive to install and operate. ac unit barely blowing airFrequent compressor cycling often leads to premature equipment failure and higher electricity costs. freon for window ac unitsOversized fans and duct work also use more energy and cause greater variation in occupant comfort. daikin ac outdoor unitWork with a qualified engineer or your system installer to make sure it is sized correctly.Customers and employees enjoy the comfort a packaged rooftop unit provides. Facility managers and building owners appreciate lower operating costs and increased equipment performance. Careful planning combined with proper maintenance should help to make everyone happy. Work closely with your contractor during the installation process and schedule a regular maintenance program.

Your electric and gas utilities offer incentives for purchasing energy efficient heating and cooling equipment. For more information, see our Save@Work section.This article has been prepared solely for the purpose of providing helpful information to users of this service. The information has been compiled by Questline, a contractor to the NHSaves utilities; however, no representation is made by either Questline or NHSaves as to the completeness or accuracy of the information contained therein. In particular, some information may be incomplete, may contain errors or may be out of date. In addition, neither Questline nor NHSaves endorses any product or service mentioned therein. Fraser-Johnston® Heating & Air Conditioning home comfort systems are designed and built to provide maximum quality, comfort, and efficiency to your home. Whether you're looking for a furnace, an air conditioner or a complete heating and cooling solution , your Fraser-Johnston® Dealer can evaluate factors such as your home's size, age, number of rooms, regional climate, and utility costs to select the best system for your home.

professionalism through North American TechnicianNATE is the leading certification program for technicians in the heating, ventilation, air-conditioning and refrigeration (HVAC/R) industry, and is the only test supported by the entire ENERGY STAREarning the ENERGY STAR® means products meet strict energy efficiency guidelines set by the U.S. Environmental Protection Agency and the Department of Energy. standard models, ENERGY STAR® products are between 15 and 25% more efficient. This model meets ENERGY STAR® requirements for energy efficiency. Fraser-Johnston Heating & Air-Conditioning DETAILSZX 04-14 ReliaCore 2003 - 12.5 Tons

3-5 Tons
13 SEER
11 EER

6-12.5 Tons
10.8-11.2 EER
11.0-12.1 IEER

7.5-12.5 Tons
12.75-14.8 IEER w/ IntelliSpeed

DETAILSZY 04-14 ReliaCore 2003 - 10 Tons

3-5 Tons
15.0-15.4 SEER
12 EER

6-10 Tons
11.5-12.2 EER
11.6-12.6 IEER

7.5-10 Tons
14.0-14.4 IEER w/ IntelliSpeed

DETAILSZQ 04-06 14 SEER ReliaCore2003-5 Tons14 SEER/12 EER DETAILSZV A3-A5 ReliaCore 3003-5 Ton17.2-18.1 SEER
13.5-14.15 EER DETAILSZK A3-A5 ReliaCore 300 MagnaDRY3-5 Tons

14.25-14.7 SEER
12.1-12.2 EER

DETAILSZW A3-A5 ReliaCore 3003-5 Tons14.5-15 SEER
12.2 EER DETAILSZU A3-A5 ReliaCore 3003-5 Tons14 SEER
11.8 EER DETAILSDW -15 to -25 Packaged Unit180 - 300 MBH10.5 to 12.0 EER / 80% SSE DETAILSDL -15 to -25 Packaged Unit 180 to 300 Mbh8.5 EER / 80% SSE DETAILSDU -15 to -25 Packaged Unit 180 to 300 Mbh9.7 to 10.0 EER / 80% SSE DETAILSWW -15 to -25 Packaged Unit180 to 300 Mbh10.4 to 12.3 EER / 80% SSE DETAILSZW 15-25 ReliaPlus 100180 to 300 Mbh

10.6-12.2 EER

11.0-13.4 IEER w/ CV

12.1-14.0 IEER w/ Intellispeed

11.0-13.4 IEER w/ VAV

DETAILSDK -15 to -25 MagnaDRY Packaged Unit180 to 300 Mbh9.7 to 11.0 EER / 80% SSE DETAILSWK -15 to -25 MagnaDRY Packaged Unit180 to 300 Mbh10.0 to 11.9 EER / 80% SSE DETAILSZS 15-25 ReliaPlus 10015-25 Tons

10.0-11.0 EER

10.5-12.1 IEER w/ CV

11.1-13.2 IEER w/ Intellispeed

10.5-12.1 IEER w/ VAV

DETAILSZK 15-25 ReliaPlus 100 MagnaDRY Reheat15-25 Tons

10.0-11.2 EER

10.3-12.2 IEER w/ CV

12.1-13.2 IEER w/ Intellispeed

10.3-12.2 IEER w/ VAV

DETAILSDK -07 to -12 MagnaDRY Packaged Unit90 to 150 Mbh11.1 to 11.2 EER / 80% SSE DETAILSZK 06-12 ReliaCore 300 MagnaDRY6.5-12.5 Tons

11.0-11.2 EER

11.4-12.5 IEER w/ CV

12.0-14.0 IEER w/ Intellispeed

11.4-12.5 IEER w/ VAV

DETAILSZU 06-12 ReliaCore 3006.5-12.5 Tons

11.5-11.7 EER

12.0-12.9 IEER w/ CV

12.0-12.9 IEER w/ VAV

DETAILSDW -12 Packaged Unit150 Mbh11.35 EER / 80% SSE DETAILSDL -06 to -12 Packaged Unit 77 to 140 Mbh9.0 to 9.3 EER / 80% SSE DETAILSDU -06 to -12 Packaged Unit 75 - 146 MBH10.0 to 11.5 EER / 80% SSE DETAILSDS -06 to -10 Packaged Unit75 - 120 MBH10.4 to 10.5 EER / 80% SSE DETAILSZW 06-12 ReliaCore 300 6.5-12.5 Tons

12.0-12.2 EER

12.7-14.0 IEER w/ CV

13.8-14.5 IEER w/ Intellispeed

12.7-14.0 IEER w/ VAV

DETAILSZS 06-12 ReliaCore 3006.5-12.5 Tons

11.0-11.2 EER

12.1-12.5 IEER w/ CV

13.0-14.0 IEER w/ Intellispeed

12.1-12.5 IEER w/ VAV

DETAILSZS 03-05 and A6 ReliaCore 1003-6 Tons

3-5 Ton Units
10.8-11.0 EER
13.0 SEER

6 Ton Units
11.0-11.2 EER
11.3 IEER

DETAILSZD 03-05 ReliaCore 1003 - 6 Tons11.8-12.0 EER
14.0 SEER