50JB-1SB
50JB034, 038, 044, 048, 054, 064
HORIZONTAL SUPPLY AND RETURN SINGLE-PACKAGE COOLING UNITS EXTENDED CHASSIS
CONSTANT VOLUME/VARIABLE VOLUME PRODUCT INTEGRATED CONTROLS CARRIER COMFORT NETWORK COMPATIBLE
ÐPERFORMANCE DATA
ÐTYPICAL FIELD WIRING
ÐCERTIFIED DIMENSION PRINTS
ÐCERTIFIED ROOF CURB DIMENSION PRINTS
R 1997 Carrier Corporation · Syracuse, New York 13221
Form 50JB-1SB New |
Printed in U.S.A. |
12-97 |
Catalog No. 515-074 |
Date: |
Supersedes: |
50JB034, 038, 044, 048, 054, 064 |
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Rev.: |
SINGLE-PACKAGE COOLING UNITS, |
50JB |
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EXTENDED CHASSIS |
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PRODUCT INTEGRATED CONTROLS |
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JOB NAME: |
LOCATION: |
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BUYER: |
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BUYER P.O. # |
CARRIER # |
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UNIT NUMBER: |
MODEL NUMBER: |
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PERFORMANCE DATA CERTIFIED BY: |
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DATE: |
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DESCRIPTION
50JB units are completely packaged, pre-wired and precharged cooling only units with PRODUCT INTEGRATED CONTROLS.
50JB units are built for horizontal supply and return applications. Their waterproof construction makes them ideally suited for installation on the accessory roof curb which is NRCA approved or slab mounting.
Units are either CONSTANT VOLUME or VARIABLE AIR VOLUME depending on the factoryinstalled options selected.
Units include space and coil tracks downstream of evaporator for ®eld or factory installation of auxiliary devices.
PRODUCT INTEGRATED CONTROL FEATURES
STANDARD CONTROL FUNCTIONS
Unit compatible with CARRIER COMFORT NETWORK or stand alone operation.
Constant Volume or Variable Air Volume control. Four to six stages of compressor unloading possible.
Supply fan control based on occupancy schedule using 365-day electronic timeclock with holiday scheduling.
Time schedule override through the space temperature sensor provided with the unit.
Compatible with 37H and 45 Series PIC terminals to form a Digital Air Volume system (DAV).
Building pressurization control in conjunction with modulating power exhaust option.
Supply duct static pressure controlled through inlet guide vanes or ®eld or factory supplied inverter.
Head pressure control to −20° F. Head pressure controlled by saturated condensing temperature, low ambient control utilizes Motormastert II fan cycling.
Lead-lag compressor control to even out run time.
Self-diagnostic run test con®rms control and component operation at unit commissioning. Self-diagnostic troubleshooting codes indicate the reason unit tripped to expedite unit repair. Codes expand to English Text.
Control of a two-speed supply fan motor on CV applications. (Twospeed motor available on Special Order.)
Building Purge Mode ¯ushes building interior with outdoor air to remove contaminants before occupancy.
Adaptive Optimal Start minimizes the amount of time and energy required before entering the occupied mode.
Unoccupied Mode Free Cooling Ð units with optimal economizer will utilize free cooling whenever possible to maintain the unoccupied set point.
Input/Output of data and monitoring of alarms can be done remotely using Building Supervisor, or at the unit using the accessory HSIO module.
Delayed Mechanical Cooling Ð units with optional economizer will utilize cooling to cool the space 3 degrees below the occupied set point to delay the need for mechanical cooling.
ADDITIONAL CONTROL FUNCTIONS
AVAILABLE THROUGH FACTORY-INSTALLED ``OPTION MODULE''
Provides a discrete output with occupancy control for use as speci- ®ed by the customer.
Controls a ®eld installed humidi®er using a 4 to 20 mA or 2-stage output. Requires accessory humidity sensor.
Smoke Control functions (Building Pressurization and Smoke Purge) are provided through software. Terminals are provided to interface with ®eld supplied smoke/®re panel.
Provides a 4 to 20 mA output to direct or reverse proportional hot water control valve for ®eld supplied hydronic heating coil. Requires a ®eld supplied freezestat to protect coil.
Factory installed suction and discharge pressure transducers and suction temperature thermistors allow remote monitoring of these parameters and superheat to provide enhanced remote diagnostics.
Differential enthalpy control can be provided using ®eld installed accessory humidity sensors.
Economizer control ®eld con®gurable to:
Ð Maintain a minimum economizer set point position, OR
ÐMaintain the minimum economizer position based on input from an IAQ sensor (®eld supplied 0 - 10 volt),
OR
ÐMaintain a constant cfm of outdoor air intake (Requires accessory Outdoor Air CFM package),
OR
ÐLook at all three above and maintain minimum economizer position based on the dominant parameter.
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UNIT FEATURES
Large hinged access doors. Standard one-year product warranty.
Standard unit as factory-assembled is listed by ETL and/or ETL, Canada.
Units are rated in accordance with ARI Standard 360. 115-volt and 24-volt control circuit.
Semi-hermetic Carrier compressors. Crankcase heaters.
Circuit breaker protection for all power components. Compressor protection includes high and low pressure cutouts.
Single low rpm supply fan with 2-in. de¯ection springs under fan sled.
High efficiency indoor motors (supply and exhaust). Tuff-Skin Rx anti-microbial insulation.
Sloped condensate pan.
Manual adjustable outside air intake for up to 25% outside air. Cabinet made of prepainted galvanized steel.
Evaporator-fan motors are protected by circuit breakers. Condenser-fan motors are internally protected. Single-point electric service entry.
Dual refrigeration circuits. Lifting lugs.
Two-inch disposable-type return air ®lters.
PERFORMANCE DATA
Unit Operating Weight |
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lb |
Cfm |
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External Static Pressure |
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in. wg |
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Indoor Entering Air db |
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F |
wb |
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Curb Weight |
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lb |
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COOLING |
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HEATING |
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Gross Total Cap. |
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Btuh @ Condenser Air Temp |
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F |
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NO UNIT MOUNTED HEAT AVAILABLE |
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Gross Sensible Capacity |
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Btuh |
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Compressor Power Input |
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kW |
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Indoor Fan Motor Size |
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Hp |
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Return Fan Motor Size |
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Hp |
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ELECTRICAL DATA
Power Supply to Unit |
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Volts |
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Phase |
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Hertz |
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Minimum Circuit Amps |
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Maximum Fuse Amps |
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OPTIONS AND ACCESSORIES
FACTORY-INSTALLED OPTIONS
MControl Option Module
MTwo-inch Pleated Filters (30%)
MBag Filters with Pre®lters (90%)
MInlet Guide Vanes or Variable Frequency Drives
MAlternate Motor and Drive
MPremium-Efficiency Motor and Drive (208/230, 460v)
MAlternate Premium-Efficiency Motor and Drive (208/230, 460v)
MEconomizer with Low Leak Dampers and Spring Return Motor
MCopper Condenser Coil
MHot Gas Bypass
MNon-Fused Unit Disconnect
FIELD-INSTALLED ACCESSORIES
MRoof Curb with Full Perimeter Support (30, 35, 40, 45 ton)
MRoof Curb with Condenser and Support (50, 60 ton)
MRoof Curb to Enclose the Condenser Section (50, 60 ton)
MOutdoor Air Cfm Package
MLocal Interface Device
MDifferential Enthalpy Control Sensor
MCondenser Coil Guard
MSpace Sensor with Set Point Adjustment
MOptional 4-Year Extended Compressor Warranty
Mx HSIO Keypad and Display Module (required for initial start-up)
M
M
M
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TYPICAL FIELD WIRING
FIELD POWER WIRING CONNECTIONS
21 11
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12 |
DISCONNECT PER NEC |
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23 13
EQUIP GND
FIELD CONTROL WIRING
TYPICAL SPACE TEMPERATURE SENSOR WIRING
Field Wiring
CCN COMMUNICATIONS BUS WIRING TO OPTIONAL SPACE SENSOR RJ11 CONNECTOR
CCN |
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COM |
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GND |
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SW |
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T |
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TB |
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TH |
Ð Thermostat, Heating |
*Constant Volume applications only.
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