Product WEATHERMASTER® 48HJ004-028 Data Single …

1 WEATHERMAKER 48TM004-028. Product WEATHERMASTER 48HJ004-028 . Data Single -Package Rooftop Units Gas Heating/Electric cooling 3 to 25 Nominal Tons Standard-Efficiency (TM) units meet minimum ASHRAE ener- gy efficiency requirements. High- Efficiency (HJ) units well exceed ASHRAE energy efficiency requirements. Gas heating with electric cooling rooftop units offer: Pre-painted galvanized steel cabinet for long life and quality appearance Commercial strength base rails with built-in rigging capability Convertible design for vertical or hori- zontal supply/return (004-014 only). 48HJ004-014 Non-corrosive, sloped condensate 48TM004-014 drain pan, meets ASHRAE 62 (IAQ). Two-inch return-air filters A wide assortment of factory-installed options available, including high-static drives that provide additional performance range Optional factory-installed COBRA . energy recovery unit (option on 48HJ004-014 units only).

2 Factory-installed PremierLink . digital communicating controls Factory-installed optional gear driven EconoMi$er IV (vertical return for sizes 004-012 only) for use with standard rooftop unit controls (includes CO2 sensor control capability). 48HJ015,017 Factory-installed optional gear driven 48TM016-025 EconoMi$er2 (vertical return only) for use with PremierLink DDC controls (includes 4 to 20 mA actuator for demand control ventilation). Humidi-MiZer adaptive dehumidi- fication system (48HJ004-014). MoistureMi$er dehumidification package Heat Options Exclusive integrated gas control board with diagnostics Alumagard heat exchanger coating Induced-draft fan for gas combustion 48TM028 Tubular, dimpled heat exchangers Natural gas LP conversion kits Low NOX (size 004-006 only). Optional stainless steel heat exchangers. Copyright 2004 Carrier Corporation 905 Form 48H,T-6PD.

3 Table of contents Page Features/Benefits .. 2-5. Features/Benefits Model Number Nomenclature.. 6-10. ARI Capacity Ratings .. 11-17 Every compact one-piece Options and Accessories .. 18-27 unit arrives fully assembled, 48TM charged, tested, and ready to Physical Data .. 28-33 run. Base Unit Dimensions .. 34-39. Accessory Dimensions.. 40-45 48 Series gas heat models Selection Procedure .. 46,47 All ignition components are contained Performance Data .. 48-93 in the compact IGC (integrated gas Electrical Data .. 94-98 controller) which is easily accessible for Typical Wiring Schematics .. 99-104 servicing. The IGC control board, de- Typical Piping and Wiring .. 105,106 signed and manufactured exclusively Guide Specifications .. 107-118. for Carrier rooftop units, provides 48HJ built-in diagnostic capability. An LED. Physical Data .. 119-127 (light-emitting diode) simplifies trouble- Base Unit Dimensions.

4 128-135 shooting by providing visual fault notifi- Accessory Dimensions.. 136-143. Selection Procedure .. 144-146 cation and system status confirmation. Performance Data .. 147-219 The IGC also contains an exclusive Electrical Data .. 220-230 anti-cycle protection for gas heat oper- Typical Wiring Schematics .. 231-241 ation. After 4 continuous cycles on the Typical Piping and Wiring .. 242,243 unit high-temperature limit switch, the Guide Specifications .. 244-267 gas heat operation is disabled, and an Controls .. 268-279 error code is issued. This feature great- Application Data .. 280-284 ly improves reliability of the rooftop Index .. 285 unit. The IGC also contains burner con- trol logic for accurate and dependable gas ignition. The LED is visible without removing the unit control box access panel. This LED fault-notification sys- tem reduces service person trouble- shooting time and minimizes service costs.

5 The IGC also maximizes heating efficiency by controlling evaporator-fan on and off delays. Tubular, dimpled gas heat exchang- ers optimize heat transfer for improved efficiency. The tubular design permits hot gases to make multiple passes across the path of the supply air. The dimpled design creates a turbulent gas flow to maximize heating efficiency. The efficient in-shot burners and all ignition components are contained in an easily removable, compact assembly. The California Air Quality Manage- ment Districts NOx requirement of 40 nanograms/joule or less is met on 004-006 size Low NOx models. The extra thick Alumagard heat exchanger coating provides corrosion resistance and ensures long life (optional stainless steel heat exchang- ers are available). The unsightly appearance of flue stacks is eliminated and the effects of wind on heating operations are dimin- ished by the induced draft combustion 2.

6 System. The inducer fan draws hot with variable-pitch pulleys which allow 48TM016-028) or accessory conver- combustion gas through the heat adjustment within the rpm ranges of sion kit (48HJ020-028). exchanger at the optimum rate for the the factory-supplied pulleys. Convenient duct openings in the most effective heat transfer. The heat Increased operating efficiency is unit basepans permit side-by-side or exchanger operates under negative achieved through computer-designed concentric duct connections (see pressure, preventing flue gas leakage coils featuring staggered internally Application data section) without re- into the indoor supply air. enhanced copper tubes. Fins are quiring internal unit modification. During the Heating mode, the ripple-edged for strength, lanced, and NOTE: On units using horizontal sup- evaporator-fan relay automatically double waved for higher heat transfer.

7 Ply and return, the accessory baromet- starts the evaporator fan after the heat ric relief or power exhaust MUST be exchanger warms up to a suitable Durable, dependable construction installed on the return ductwork. temperature. The 30-second fan delay Designed for durability in any climate, Thru-the-bottom service connec- prevents cold air from entering the supply duct system when the condi- the weather-resistant cabinets are con- tion capability comes standard with structed of galvanized steel and bond- the rooftop unit to allow power and tioned space is calling for heat to erized, and all exterior panels are coat- control wiring and gas connections to maximize efficiency. ed with a prepainted baked enamel fin- be routed through the unit's basepan, The direct-spark ignition system thereby minimizing roof penetrations ish. The paint finish is non-chalking, saves operating expense when com- (to prevent water leaks).

8 (Thru-the- and is capable of withstanding ASTM. pared to pilot ignition systems. No bottom gas connection requires thru- crossover tube is required, therefore no (American Society for Testing and Ma- terials) B117 500-hour Salt Spray the-bottom accessory kit.) Power, gas sooting or pilot fouling problems can and control connections are made on Test. All internal cabinet panels are occur. the same side of the unit to simplify primed, permitting longer life and a All standard units are designed for more attractive appearance for the installation. natural gas, but an accessory LP (liquid entire unit. The non-corrosive sloped conden- propane) conversion kit is available. sate drain pan (size 004-014). In addition, all size 004-014 units All units have a flame rectification are designed with a Single , continuous permits either an external horizontal sensor to quickly sense the burner top piece to eliminate any possible side condensate drain (outside the roof flame and ignite burners almost imme- leaks at seams or gasketing.)

9 Totally en- curb) or an internal vertical bottom diately. Fast shutdown is a certainty closed condenser-fan motors and per- drain (inside the roof curb). Both since the sensor reacts quickly to any manently lubricated bearings provide options require an external, field- flame outage or system failure. In the additional unit dependability. supplied P-trap. event of a shutdown, an error code is Standard 2-in. throwaway filters issued at the IGC board. Easy installation and conversion are easily accessed through a remov- Safety is also assured due to the able panel located above the air intake heating safety controls which will shut All units are shipped in the verti- hood. No tools are required to change down the unit if there is a problem. If cal duct configuration for fit-up to unit filters. excessive temperatures develop, limit standard roof curbs. The contractor can order and install the roof curb early Belt-driven evaporator-fan motors switches shut off the gas valve.

10 After (optional on TM units under 6 tons). 4 continuous short cycles of the high- in the construction stage, before deci- sions on size requirements are made. allow maximum on-site flexibility with- temperature limit switch, the IGC out changing motors or drives. board locks out the gas heat cycle to All units feature a base rail design with forklift slots and rigging holes for Low voltage wiring connections prevent any further short cycles. This easier maneuvering. Durable packag- are easily made thanks to the large ter- safety feature is provided exclusively on Carrier rooftop units. The rollout ing protects all units during shipment minal board which is located for quick, and storage. convenient access. switch also deenergizes the gas valve in the event of a flame rollout. The units can be easily converted In addition, color-coded wires permit from a vertical to a horizontal duct con- easy tracing and diagnostics.