Carrier 48N- Manuals

8 48 N2 D N 6 0 Option Code Factory Options 48 – Cooling Unit with Gas Heat See note below ConfigurationN2 – Vertical Suppy/Return, CV/SAV ComfortLink Controls Design Revision Level N3 – Vertical Supply/Return, VAV ComfortLink Controls 0 – Initial Release N4 – Horizontal Suppy/Return, CV/SAV Comfort...

10 UNIT DESIGN AIRFLOW LIMITS NOTE: Applies for standard filters only; additional filtration options mayreduce maximum allowed airflow. UNIT SIZE (NOMINAL CAPACITY, TONS) UNIT TYPE MINIMUM COOLING CFM MAXIMUM CFM N (75) 48N Low Heat 15,000 37,500 48N High Heat 15,000 37,500 50N Electric Heat 15,000 ...

11 TWO-STAGE GAS HEATING CAPACITIES - 48N UNITS (Natural Gas on All Units) NOTES:1. Ratings are approved for altitudes to 2000 ft. At altitudes over 2000 ft, ratings are 4% less for each 1000 ft above sea level. 2. At altitudes up to 2000 ft, the following formula may be used to calcu- late air temp...

12 MODULATING GAS HEATING CAPACITIES — 48N UNITS (Natural Gas on All Units) NOTES: 1. Ratings are approved for altitudes to 2000 ft. At altitudes over 2000 ft, ratings are 4% less for each 1000 ft above sea level. 2. At altitudes up to 2000 ft, the following formula may be used to calcu- late air te...

13 48/50N SIZES N-T (75-150 TONS NOMINAL CAPACITY) LEGEND *Base unit includes: economizer dampers and hoods, filter tracks less filters, evaporator coilmounting less the evaporator, extended plenum, and standard efficiency condenser. For 75-105nominal ton units only, base unit weight also includes t...

16 A B C D E F MULTIPLE UNIT MINIMUM SEPARATION a48-8682 MINIMUM SPACING (ft) UNIT A B C D E F 48 Series 12 8 12 10 10 10 50 Series 10 8 8 10 10 10 Physical data (cont)

17 REFRIGERANT CHARGE UNIT SIZE (NOMINAL CAPACITY, TONS) UNIT CONFIGURATION CHARGE (LB) CHARGE (LB) UNITS WITHOUT HUMIDI-MIZER ® SYSTEM UNITS WITH HUMIDI-MIZER ® SYSTEM Circuit A Circuit B Circuit A Circuit B N (75) Standard Capacity Standard Efficiency 46.5 52.6 46.5 69.6 High Capacity Standard Eff...

18 FAN AND DRIVE INFORMATION FAN MOTOR HP MOTOR RPM MOTOR SHAFT SIZE (in.) FAN RPM FAN SHAFT SIZE (in.) DRIVE SHEAVE BROWNING BUSHING TYPE DRIVEN SHEAVE BROWNING BUSHING TYPE BELTS QTY OF BELTS FAN SPEED (rpm) SUPPLY FAN Standard Fan75-105 Tons Nominal Capacity 50 1770 2.125 1800 2.25 4B5V70 B 2 1/8...

19 FAN AND DRIVE INFORMATION (cont) MOTORS FAN MOTOR HP MOTOR RPM MOTOR SHAFT SIZE (in.) FAN RPM FAN SHAFT SIZE (in.) DRIVE SHEAVE BROWNING BUSHING TYPE DRIVEN SHEAVE BROWNING BUSHING TYPE BELTS QTY OF BELTS FAN SPEED (rpm) RETURN FAN Standard Return Fan All Sizes 50 1770 2.125 1236 2.5 4B5V70 B 2 1...

20 STAGING SEQUENCES SIZE N STAGING SEQUENCE WITH MLV (75 TON NOMINAL CAPACITY) *Minimum load valve (MLV). MLV is enabled on Circuit A when decreas-ing from stage 1 to stage 0 to provide an increased stage of capacity. SIZE N STAGING SEQUENCE WITH DIGITAL COMPRESSOR (75 TON NOMINAL CAPACITY) SIZE N ...

22 OPERATING WEIGHTS OF OPTIONS AND ACCESSORIES (lb) OPTION OR ACCESSORY 48/50N UNIT SIZE (TON NOMINAL CAPACITY) N (75) P (90) Q (105) R (120) S (130) T (150) Economizer 140 140 140 140 140 140 Filters 2 in. MERV 7 90 90 90 100 100 100 4 in. MERV 8 150 150 150 175 175 175 4 in. MERV 14 175 175 175 2...

24 ITEM OPTION* ACCESSORY† SPECIAL ORDER** GAS HEAT (48N units only) Low, Medium or High Gas Heat — Aluminized Heat Exchanger X Low, Medium or High Gas Heat — Stainless Steel Heat Exchanger X Ultra High Gas Heat — Stainless Steel Heat Exchanger X Staged or Modulating Gas Heat — Stainless Steel Heat ...

26 Chassis arrangements (48 Series units) Standard chassis — The standard chassis may be pro- vided with a bottom or side return air opening. The returnair follows a straight-through path to the supply fan, theninto the heating section and exits through a bottom or leftside supply air outlet. The su...

27 with optional modulating power exhaust or return fan inconjunction with an optional economizer. Factory-installedoptional electric heat is available on these units. Standard chassis with discharge plenum andoptional blank section or final filters This configuration may be provided with a bottom o...

28 48N UN IT SIZES N , P , Q (75-10 5 TON NO MINAL C A P ACITY) A48-8684 Base unit dimensions

36 0'-1" [25.4] 0'-3" [76.2] 0'-1 3/4" [44] "D" SUPPORT SEE CONDENSER SECTION 10'-8 7/8" [3274] "C" 4'-1-1/2" [1257] "B" SEE NOTE 4 "A" 8'-9" [2667] 11'-3/8" [3363] 10'-8 7/8" [3274] 1'-2" [356] 1'-1/16" [309] 0'-1 3/4" [44]...

38 0'-1" [25.4] 0'-3" [76.2] 0'-1 3/4" [44] "D" SUPPORT SEE CONDENSER SECTION 10'-8 7/8" [3274] "C" 4'-1-1/2" [1257] "B" SEE NOTE 4 "A" 8'-9" [2667] 11'-3/8" [3363] 10'-8 7/8" [3274] 1'-2" [356] 1'-1/16" [309] 0'-1 3/4" [44]...

41 COMPONENT PRESSURE DROPS (in. wg) SIZES N, P, Q (75-105 TON NOMINAL CAPACITY) LEGEND COMPONENT AIRFLOW (cfm) 15,000 19,000 23,000 27,000 31,000 35,000 39,000 43,000 47,000 52,000 High-Capacity Coil (75-90) 0.05 0.10 0.14 0.18 0.22 0.26 0.29 0.32 0.34 0.37 High-Capacity Coil (105) 0.04 0.09 0.14 0...

43 Please refer to the Applied RTU Builder software for the unit electrical data. The unit electrical data may also befound in the unit Installation Instructions. MOTOR LIMITATIONS LEGEND NOTES: 1. Extensive motor and electrical testing on the Carrier units has ensured that the full horsepower range...

44 Control components The 48/50N Series rooftops use the Comfort Link control system that has been developed for use in Carrier Com-mercial equipment. The control system monitors all oper-ating conditions in the rooftop unit as well as controllingthe compressors, economizers, fans, heat and other de...

45 controls and provides an additional stage of capacity aswell as low load coil freeze protection. The control also in-tegrates the use of an economizer with the use of mechan-ical cooling to allow for the greatest use of free cooling.When both mechanical cooling and the economizer are be-ing used,...

47 displayed by the Comfort Link scrolling marquee in parts per million (ppm). Outdoor air cfm control — Minimum space ventilation requirements can also be maintained by applying the mini-mum outdoor air cfm control option. This option providesan airflow monitoring station at the outside air damper ...

48 4 to 20 mA signal. It can be connected to terminals 8and 9 on TB202. • Remote Static Pressure Reset Set Point — A remote supply air temperature set point reset can be supportedwhen the controls expansion module is used. This inputrequires a 4 to 20 mA signal. It can be connected to ter-minals 6 a...

49 • For units connected to the CCN network the user can also display all the unit information including I/O valuesMaintenance, Configuration, Service, and Set Pointdata tables • Indoor air quality (IAQ) Variable air volume (VAV) applications The 48/50N Series units are designed to operate in VAVapp...

50 Constant volume and staged air volume space tem-perature sensor control — If the space temperature op- eration has been selected using a T55, T56, or T58 sensorthen the following logic will be used to control theoperation of the unit. If a space temperature is used then awire jumper must be added...

51 mode the control will energize the heat interlock relaywhich will signal the terminals to open to the heating posi-tion. Note that for the linkage systems the interlock relayconnection is not required. Once the Heat mode is en-abled, the heat capacity will be controlled by the return airtemperatu...

53 Ductwork — Secure vertical discharge ductwork to the roof curb. Interior installation may proceed before the unitis set in place on the roof. For horizontal discharge appli-cations, attach the ductwork to the flanges on the side ofthe unit. Vertical discharge units equipped with electricheat requ...

54 B "J" AUXILIARY COIL LOCATION LOCATION OF COIL TRACKS AUXILIARY COIL LOCATION — in. UNIT SIZES 48/50N (TONS) HEIGHT B DISTANCE J N, P, Q (75-105) 12.85 See dimenson J on certified drawings, pages 28-35 R, S, T (120-150) 12.85 Application data (cont)

55 MAIN POWER SUPPLY ENTRY NATURAL GASSUPPLY LINEWITH SHUTOFF CONTROL WIRING ENTRY CONDENSATE DRAIN CONNECTION STANDARD UNITS a48-8675 Typical piping and wiring

56 460V ONL Y POWER SCHEMA TIC — SIZE N SHOWN (75 TON N OMINAL CAP ACITY) a48-8658 Typical wiring schematics

58 CONTROL SECTION — 48/50N UNITS a48-8660 Typical wiring schematics (cont)

62 STANDARD GAS HEAT SCHEMATIC a48-8664 Typical wiring schematics (cont)

70 LEGEND FOR TYPICAL CONTROL WIRING SCHEMATICS ACCSY — Accessory ACC’Y — Accessory AF — Air Foil AN — Analog AO — Anaolog Output BR — Blower Relay C — Compressor Contactor CB — Compressor Circuit Breaker CCB — Control Circuit Breaker CCH — Crankcase Heater CCHR — Crankcase Heater Relay CCN — Carrie...

71 Packaged Rooftop Cooling Unit with Gas Heat and Comfort Link Controls HVAC Guide Specifications —Section 48N2,N3,N4,N5,N6,N7,N8,N9 Size Range: 75 to 150 Tons, Nominal Carrier Model Number: 48N2 (Vertical Supply/Return, Constant Volume [CV] Application, Staged Air Volume [SAV™])48N3 (Vertical Supp...

82 Packaged Rooftop Cooling Unit with Comfort Link Controls and Optional Electric or Hydronic Heat HVAC Guide Specifications —Section 50N2,N3,N4,N5,N6,N7,N8,N9 Size Range: 75 to 150 Tons, Nominal Carrier Model Number: 50N2 (Vertical Supply/Return, Constant Volume [CV] Application, Staged Air Volume ...

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Pg 92 Catalog No. 04-52480031-01 Printed in U.S.A. Form 48/50N-1PD Replaces: 48/50N-1APD Carrier Corporation • Syracuse, New York 13221 8-13 Section 1 2T...