48A WEATHERMAKER®
116Pages

Product Data WEATHERMAKER® 48/50A2,A3,A4,A5020-060 Single-Package Gas Heating/Electric Cooling Rooftop Units and Electric Cooling Rooftop Units with Optional Electric Heat with COMFORTLINK Controls and PURON® Refrigerant (R-410A) 20 to 60 Nominal Tons Carrier’s 48/50A Series commercial packaged rooftops offer: • Puron (R-410A) environmentally sound refrigerant • Novation® heat exchanger technology with microchannel coil • An easy-to-use, plain language display on the ComfortLink controls • EERs (energy efficiency ratios) meet ASHRAE (American Society of Heating, Refrigerating, and Air Conditioning Engineers) Standard 90.1-2010 • Meets ASHRAE Standard 62 • Constant, staged, or variable air volume • Communicating controls • Accurately match building loads with up to 5 steps of capacity • VFD (variable frequency drive) on all VAV (variable air volume) units and SAV™ (staged air volume) units • Mechanical cooling operation at outdoor ambient temperatures as low as 32 F (–20 F with optional Motormaster® V fan speed control) Carrier’s 48/50A commercial packaged unit offers design flexibility, quality, reliability, and ComfortLink controls. a48-8351 Copyright 2012 Carrier Corporation Design flexibility Dedicated vertical supply/return units (A2,A3) are ideal for new construction or retrofit to existing installations. The low unit profile is maintained when the unit is installed on the accessory roof curb. The ducts are attached directly to the roof curb to allow all ductwork to be completed before the unit is positioned. Form 48/50A-13PD

Features/Benefits (cont) Dedicated horizontal units (A4,A5) are ideal for replacement or applications such as through-the-wall where sound must be attenuated before the duct penetrates the roof. Ducts connect directly to the unit. Horizontal units may be curb or slab mounted. ComfortLink controls Factory-installed ComfortLink controls provide the capability for free standing operation or it may be linked with a more extensive system. Factoryinstalled and programmed BACnet* communication capability provides simple integration with the building HVAC system (e.g., terminal devices), an i-Vu®...

pressure for optimum supply fan energy savings. The VAV units have up to 5 stages of capacity control to match the load requirements of the conditioned space. Other VAV features include: • control of cooling and heating (if equipped with heat) in both occupied and unoccupied mode • support of optional space temperature sensor • control of modulating economizer to provide free cooling when outdoor conditions are suitable • support of IAQ (indoor air quality) sensor • support linkage to ComfortID™ VAV systems Staged air volume units utilize the VFD to allow for a configurable high and low fan...

Features/Benefits (cont) ComfortLink controls expansion module (CEM). Staged gas unit heating The staged gas control option adds the capability to control the rooftop unit’s gas heating system to a specified supply air temperature set point for purposes of tempering a cool mixedair condition, or for reheat when the mechanical cooling is being used for dehumidification. The gas heating system employs multiple heating sections. Each section is equipped with a two-stage gas valve. The gas valves are sequenced by a factory-installed staged gas controller (SGC) as required to maintain the...

Model number nomenclature 48A2,A3,A4,A5 UNITS 48 48 – Cooling Unit with Gas Heat Configuration A2 – CV/SAV Vertical with ComfortLink Controls and Puron® Refrigerant (R-410A) A3 – VAV Vertical with ComfortLink Controls and Puron Refrigerant (R-410A) A4 – CV/SAV Horizontal with ComfortLink Controls and Puron Refrigerant (R-410A) A5 – VAV Horizontal with ComfortLink Controls and Puron Refrigerant (R-410A) Heat Options D – Low Gas Heat E – High Gas Heat M – Low Gas Heat Stainless N – High Gas Heat Stainless S – Staged Low Gas Heat Stainless T – Staged High Gas Heat Stainless Unit Size - Nominal...

Model number nomenclature (cont) 50A2,A3,A4,A5 UNITS 50 Factory-Installed Options Refer to price pages for available option codes. Configuration A2 – CV/SAV Vertical with ComfortLink Controls and Puron® Refrigerant (R-410A) A3 – VAV Vertical with ComfortLink Controls and Puron Refrigerant (R-410A) A4 – CV/SAV Horizontal with ComfortLink Controls and Puron Refrigerant (R-410A) A5 – VAV Horizontal with ComfortLink Controls and Puron Refrigerant (R-410A) Packaging/Communication 1 – Domestic 3 – Export A – Domestic with BACnet Communication Option C – Export with BACnet Communication Option...

Ratings and capacities ELECTRIC RESISTANCE HEATER DATA UNIT 50A2,A3,A4,A5 020-035 LO HEAT 020-035 HIGH HEAT 040,050 LO HEAT 040,050 HIGH HEAT 060 LO HEAT 060 HIGH HEAT DESIGN RANGE NOTE: Due to the open design of the electric heaters, the airside pressure drop is negligible. *Operation at these levels may be limited by entering evaporator air wet bulb temperatures. See Cooling Capacities tables on pages 39-46 for further details. MAX CFM* 10,000 10,000 12,500 12,500 13,500 13,500 15,000 15,000 17,500 17,500 20,000 20,000 20,000 20,000 27,000 27,000 †Variable air volume units will operate...

Ratings and capacities (cont) CAPACITY CONTROL STAGING OPTIONS DEMAND SOURCE SAV/CV, Mech Thermostat COMPRESSOR SEQUENCE SIZE 020-027 UNITS SIZE 030-060 UNITS WITHOUT WITH WITHOUT WITH HOT GAS HOT GAS HOT GAS HOT GAS BYPASS BYPASS BYPASS BYPASS Table C Table D Table E Table F Table C Table D Table E Table F Table A NA Table B NA Table C Table D Table E Table F Table A NA Table B NA Table C Table D Table E Table F COOLING CONTROL METHOD Multiple Stage EDT Multiple Stage EDT 2 Stage Demand Multiple Adaptive Demand 2 Stage Demand Multiple Adaptive Demand LEGEND Constant Volume Evaporator...

CAPACITY CONTROL STAGING OPTIONS TABLE D 48/50A020-027 UNIT VAV AND ADAPTIVE CV STAGING SEQUENCE WITH HOT GAS BYPASS STAGE SEQUENCE 1 2 3 Compressor Status ON OFF OFF ON OFF ON Capacity 48/50A 30% 70% 33% 67% 33% 67% SEQUENCE 2 2 3 Compressor Status OFF ON ON OFF OFF ON Capacity 48/50A 30% 70% 33% 67% 33% 67% CAPACITY CONTROL STAGING OPTIONS TABLE E 48/50A030-060 UNITS VAV AND ADAPTIVE CV STAGING SEQUENCE WITHOUT HOT GAS BYPASS STAGE CAPACITY CONTROL STAGING OPTIONS TABLE F 48/50A030-060 UNITS VAV AND ADAPTIVE CV STAGING SEQUENCE WITH HOT GAS BYPASS STAGING SEQUENCE STAGE COMP A1 A2 B1 B2...