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).

2 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). 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).

3 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).

4 Optional stainless steel heat exchangers. Copyright 2004 Carrier Corporation 905 Form 48H,T-6PD. 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.

5 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 .. 128-135 shooting by providing visual fault notifi- Accessory Dimensions.

6 136-143. 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.

7 280-284 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. 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.

8 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).

9 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. 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.

10 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. 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.