Product Data WeatherMaster Single-Package Rooftop Units

1 2020 CarrierForm 48-50P-11PD Rev. A48/50P2,P3,P4,P5,P6,P7,P8,P9 030-100 Single-Package Gas Heating/Electric Cooling Rooftop Unitsand Electric Cooling Rooftop Units with Optional Electric Heatwith ComfortLink Controls and Puron Refrigerant (R-410A) Product DataWeatherMaster Single-Package Rooftop Units30 to 100 Nominal Tons2 Carrier s 48/50P commercial packaged unit offers design flexibility, quality, reliability, interoperability and ComfortLink s 48/50P Series commercialpackaged rooftops offer: Puron refrigerant (R-410A) Novation heat exchanger technol-ogy with microchannel coil scroll compressors variable capacity digital scroll com-pressor option constant volume (CV) staged air volume (SAV ) variable air volume (VAV)

2 Vertical supply/return Units horizontal supply/return Units flexible chassis and plenum options optional return fan or power exhaust Greenspeed Intelligence controloption staged or modulating gas heat control hydronic heat option high-capacity evaporator coil optional airfoil fan Humidi-MiZer adaptive dehumidifi-cation optionComfortLink controlsFactory-installed ComfortLink controlsprovide the capability for free standingoperation or may be linked with a moreextensive system. Optional factory-installed and programmed BACnet1communication capability provides sim-ple integration with the building HVAC system ( , terminal devices), an i-Vu Open control system or a BACnet build-ing automation controls also have thecapability to communicate with theCarrier Comfort Network (CCN) sys-tem.

3 This communication flexibilityallows simple system integration as wellas data collection, trending, monitoringand alarm 48/50P Series may also be con-figured to communicate via MODBUS2or LonWorks3 protocols, if required bythe ComfortLink controls can alsointerface directly with Carrier Open orCCN controls on 35 and 45 SeriesVAV terminals to form a system foroptimal efficiency and tenant Units may also be applied to non-communicating building control sys-tems via switch and/or 4 to 20 mA sig-nal to provide remote occupancycontrol, fire shutdown and smoke con-trol modes, IAQ (indoor air quality)modes, and demand limit addition, VAV Units can interfacewith other control systems via a 4 to20 mA signal capability which permitscontrol of supply-air temperature ComfortLink controls func-tions include.

4 Easy-to-use, plain English display supply-fan control based on occu-pancy schedule up to 6 steps of cooling capacity con-trol with standard scroll compressors digital scroll compressor option thatallows variable control of compres-sor capacity to match load require-ment of the space lead-lag circuit control to equalizethe operating hours between thedual refrigeration circuits 2-stage heat control adaptive optimal start/morningwarm-up 2 stage thermostat control (SAV/CVonly) head pressure control to 32 F ambi-ent outdoor-air temperature economizer and ventilation control economizer sequence enabled bystandard outside air enthalpy switch adjustment of space set point in theoccupied space on CV applications selectable supply air set point inboth CV, SAV , and VAV modes control of optional variable fre-quency supply-fan drives interface with 35 or 45 Series VAVterminals to create a system IAQ and demand controlled ventila-tion control support space temperature reset (VAV applications)

5 Local or remote unit alarm and alertmonitoring filter maintenance alarm building ventilation mode purge self-monitoring diagnostics demand limiting external input to permit supply-airtemperature reset using a 4 to 20 mAsignal from another control system easy replacement of select legacy30-100 ton Carrier Rooftop unitsA self-diagnostic microprocessor man-ages all unit sequences, includingstages of cooling and unit safety con-trols. The microprocessor also con-trols stages of cooling and unit safetycontrols. At start-up, the self-diagnostictest verifies component operation andcalibration. Fault codes and expandedfault descriptions reduce service trou-bleshooting time and designA unique feature of these Units withComfortLink controls is that the con-trols will support both CV, SAV, andVAV unit operations.

6 The controls areconfigured in the factory, based on theunit model and options BACnet is a registered trademark of ASHRAE (American Society of Heating, Refrigerating, and Air-Conditioning Engineers).2. Modbus is a registered trademark of Schneider LonWorks is a registered trademark of Echelon of contentsPageFeatures/Benefits .. 2 Model Number Nomenclature .. 6 Ratings and Capacities .. 7 Physical 15 Options and 47 Base unit Dimension Examples .. 54 Accessory 63 Selection Procedure .. 68 Performance 69 Electrical Data .. 151 Application 160 Typical Piping and Wiring .. 168 Typical Wiring Schematics .. 169 Guide 1763 System functions like adaptive optimalstart, nighttime free cooling, buildingsmoke control modes, occupied heat-ing and IAQ support are resident in thecontrols and can be easily integratedinto the control system balancedPuron refrigerant (R-410A)

7 Is an HFCrefrigerant that does not contain chlo-rine that is damaging to the ozone refrigerant is a safe, efficient, andenvironmentally balanced and reliabilityExcellent full and part load efficienciesare achieved by using multiple scrollcompressors and indoor coils withintertwined dual refrigerant compressors are equipped withcrankcase heaters and protected byelectronic sensors and logic to controlminimum on and off times and reverserotation. The refrigerant circuits areboth electrically and mechanically inde-pendent, to provide standby capabilityshould one circuit require heat exchanger technologyThe Novation heat exchanger designwith microchannel condenser coil is arobust, cost effective alternative to tradi-tional coil design for standard applica-tions.

8 Microchannel coils are also sturdierthan other coil types, making them eas-ier to clean without causing damage tothe to the compact, all-aluminumdesign, microchannel coils reduce over-all unit operating weight. The stream-lined microchannel coil also reducesrefrigerant charge by up to 40%.Microchannel coils are not recom-mended by Carrier for marine, coastal,or industrial environments, unless aCarrier-approved coating is capacity digital scroll compressorIn air conditioning applications, theload may vary significantly, requiring ameans to vary the system coolingcapacity for optimal system perfor-mance and control. The 48/50P serieslarge Rooftop Units with digital scrollcompression provide a highly efficientmeans of capacity control using scrollcompressors.

9 The digital compressortechnology provides smooth, vibrationfree operation by axially unloading thecompliant scrolls. By varying theamount of time that the scrolls areunloaded, the unit is able to preciselymatch the system capacity to the spaceload. This feature can reduce energyconsumption, provide better dehumidi-fication, reduce compressor cycling,and improve comfort in the adaptive dehu-midification systemCarrier s Humidi-MiZer adaptive dehu-midification system is an all-inclusivefactory-installed option that can beordered with any WeatherMaster commercial Rooftop system expands the envelope ofoperation of the Rooftop to provideunprecedented flexibility that will meetyear-round comfort conditions.

10 TheHumidi-MiZer adaptive dehumidificationsystem has the industry s only dual dehu-midification mode setting. The Weather-master Rooftop , coupled with theHumidi-MiZer adaptive dehumidificationsystem, is capable of operating in normaldesign cooling mode, subcooling mode,and hot gas reheat design cooling mode will oper-ate under the normal sequence ofoperation. Subcooling mode will oper-ate to satisfy part load type conditionsby providing both cooling andenhanced dehumidification. Hot GasReheat mode will operate when thereis a demand for dehumidification butno demand for space cooling. Hot GasReheat mode will provide neutral airfor maximum dehumidification opera-tion without over-cooling the WeatherMaster 48/50P Seriesnext generation version of Carrier sHumidi-MiZer system includes refriger-ant modulating valves that provide vari-able flow bypass around the innovative feature ensures exactcontrol of the supply-air temperatureas the unit lowers the evaporator tem-perature to increase latent , when the space requiresdehumidification only.