Carrier 50DD028 Specifications

Installation, Start-Up andService InstructionsCONTENTSPageSAFETY CONSIDERATIONS ...2INSTALLATION ...2-30Rigg

UNIT50DW,DYWEIGHT* A B C D ELb Kg mm ft-in. mm ft-in. mm ft-in. mm ft-in. mm ft-in.024 2650 1202 1549.4 5-1 2182.0 7-17⁄8682.0 2-27⁄83909.0 12-97⁄8533

Fig. 4 — Drain Location SelectionFig. 5 — Condensate Drain LocationROOF MOUNT DRAINSLAB MOUNT DRAINFig. 7 — Condensate Drain Piping DetailsFig. 8 — Ou

Install Outdoor-Air Hoods25% OUTDOOR-AIR HOOD — This hood is shipped sepa-rately from the base unit, in a carton marked 50DJ900411.This carton contain

ECONOMIZER HOODS — These hoods are shipped sepa-rately from the base unit, in a crate marked 50DJ900051.This carton contains:3 — preassembled economiz

economizer hood assembly.) Once economizer hood as-sembly is in place, secure it using 10 of the screws fromthe fastener package (5 per side).10. Usin

Cartons contain:1 — preassembled hood/damper/motor assembly1 — fastener package (taped to inside of hood)The fastener package contains:6 — screws,1⁄4A

Field Electrical ConnectionsIMPORTANT: The VAV units (50DK,DY) generate,use, and can radiate radio frequency energy. If unitsare not installed and use

Unit failure as a result of operation on improper line volt-age or excessive phase imbalance constitutes abuse and maycause damage to electrical compo

Table 2 — Electrical Data — 50DJ,DW024NOMINALV-PH-HZVOLTAGERANGECOMPRNO. 1COMPRNO. 2OFM IFMPOWER EXHAUSTFAN MOTOR*ELECTRICHEATPOWER SUPPLYMin Max RLA

Table 3 — Electrical Data — 50DJ,DW028NOMINALV-PH-HZVOLTAGERANGECOMPRNO. 1COMPRNO. 2OFM IFMPOWER EXHAUSTFAN MOTOR*ELECTRICHEATPOWER SUPPLYMin Max RLA

Refrigerant Feed Components ...51Thermostatic Expansion Valve (TXV) ...51Moisture/Liquid Indicator ...51Filter Drie

Table 4 — Electrical Data — 50DJ,DW030NOMINALV-PH-HZVOLTAGERANGECOMPRNO. 1COMPRNO. 2OFM IFMPOWER EXHAUSTFAN MOTOR*ELECTRICHEATPOWER SUPPLYMin Max RLA

Table 5 — Electrical Data — 50DK,DY024NOMINALV-PH-HZVOLTAGERANGECOMPRNO. 1COMPRNO. 2OFM IFMPOWER EXHAUSTFAN MOTOR*ELECTRICHEATPOWER SUPPLYMin Max RLA

Table 6 — Electrical Data — 50DK,DY028NOMINALV-PH-HZVOLTAGERANGECOMPRNO. 1COMPRNO. 2OFM IFMPOWER EXHAUSTFAN MOTOR*ELECTRICHEATPOWER SUPPLYMin Max RLA

Table 7 — Electrical Data — 50DK,DY030NOMINALV-PH-HZVOLTAGERANGECOMPRNO. 1COMPRNO. 2OFM IFMPOWER EXHAUSTFAN MOTOR*ELECTRICHEATPOWER SUPPLYMin Max RLA

LEGENDC—Compressor ContactorCB — Circuit BreakerCCB — Control Circuit BreakerCV — Constant VolumeDU — Dummy TerminalECON — EconomizerEQUIP — Equipment

Fig. 19 — Field Control Thermostat Wiring,50DJ,DW CV UnitsSwitch 1 — Firestat or smoke detector — normally closed.Switch 2 — Building pressurization s

CONTROL WIRING, VAV UNITS (DK,DY) — A switchor timeclock (field-supplied) must be wired in to control whenunit will go into and out of occupied mode. C

NOTES:1. CB must trip amps are equal to or less than 140% FLA.2. If any of the original wire furnished must be replaced, it must be replacedwith type

LEGENDHIR — Heating Interlock RelaySW — SwitchNOTES:1. SW1 — Field-supplied switch (or timeclock) used to move unit inand out of the occupied mode.2.

LEGENDDPS — Differential Pressure SwitchECR — Economizer RelayHIR — Heating Interlock RelayIFC — Evaporator (Indoor) Fan ContactorMIR — Modulating Int

NOTICE TO RIGGERSUNIT50WEIGHT A B CECONOMIZER(Without Hood)lb kg in. mm in. mm in. mm lb kgDJ,DK024 2440 1107 66.14 1680 49 1244.6 44 1117.6 130 59.1D

The following options require 24-v connections. Refer toFig. 22 for terminal block locations and to unit label dia-grams for wiring details.Timeclock

See Carrier Standard Service Techniques, Refrigerants sec-tion, for procedures to add or remove oil.If oil charge is above sight glass, do not remove

Table 9A — Evaporator-Fan Pulley Data —Constant Volume Units (50DJ,DW) and Standard VAV Units (50DK,DY)UNIT 50FANRPMMOTOR PULLEY BLOWER PULLEY BELTSNo

Table 9B — Evaporator-Fan Pulley Data —VAV Units with Inlet Guide Vane and Static Pressure Control OptionUNIT 50FANRPMMOTOR PULLEY BLOWER PULLEY BELTS

Table 11 — Fan Performance — 50DJ Units and 50DK Units Without Inlet Guide VanesUNIT50DJ,DKAIRFLOW(Cfm)AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)0.2

Table 12 — Fan Performance — 50DW Units and 50DY Units Without Inlet Guide VanesUNIT50DW,DYAIRFLOW(Cfm)AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)0.2

Table 13 — Fan Performance — 50DK Units with Inlet Guide Vanes (cont)UNIT50DKAIRFLOW(Cfm)AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)0.2 0.4 0.6 0.8 1.

Table 15 — Component Pressure Drops (in. wg)COMPONENTCFM6000 7000 8000 9000 10,000 11,000 12,000ECONOMIZERAll Units 0.18 0.20 0.25 0.28 0.32 0.36 0.40

Table 16 — Configuration Header Jumper DescriptionJUMPER NO. FUNCTION SETTING MEANING1,2 Unit Type Mm VAV Rooftop3,4,5No. ofCompressorsmMMMmMmmM2 compr

P4 (Demand Limit) — Usable only if demand limit is used.If demand limit is used, dip switch 5 must be in the ONposition. The valid range is 0 to 100%

Table 1A — Physical Data, Constant Volume UnitsUNIT 50 DJ024 DW024 DJ028 DW028 DJ030 DW030OPERATING WEIGHT (lb)* 2440 2650 2900 3100 2930 3140COMPRESS

IMPORTANT: Once quick test is initiated, display but-ton must be pressed at least once every 10 minutes forcontrol to remain in quick test mode. If bu

Table 18 — Quick Test, Thermistor and Potentiometer CheckQUICKTESTSTEP NO.NORMALDISPLAYDESCRIPTIONTHERMISTOR ORPOTENTIOMETER1.411 — Thermistor OK0 — T

Table 20 — Sensor Resistance ValuesTEMP(F)RESISTANCE(Ohms)TEMP(F)RESISTANCE(Ohms)TEMP(F)RESISTANCE(Ohms)−60 362,640 45 11,396 150 1,020−55 297,140 50

Condenser fans are energized with compressor no. 1. Theno. 1 fan runs continuously while the unit is on mechanicalcooling; the no. 2 fan is cycled on

With smoke purge mode, it is necessary to interrupt powerto unit control circuit as described above for building pres-surization.All switches and wiri

EVAPORATOR-FAN MOTORS, PULLEYS, AND BELTS— Access to these components is through the 2 doors la-beled FAN SECTION on the left side of the unit (when f

MODULATING POWER EXHAUST DIFFERENTIALPRESSURE SWITCH — The differential pressure switch islocated in the small control box mounted on the corner postn

FAN SHAFT BEARINGS — Lubricate fan shaft bearings atleast once a year with suitable bearing grease. Typical lu-bricants are given below:Manufacturer L

CONDENSER FAN — To adjust condenser fans:1. Turn off unit power.2. Remove fan guard and loosen fan hub setscrew.3. See Fig. 28 and adjust fan height u

null span, turn null adjusting screw (Fig. 41) clockwise todecrease span and counterclockwise to increase span. Allswitches leave factory with null sp

Table 1B — Physical Data, Variable Volume UnitsUNIT 50 DK024 DY024 DK028 DY028 DK030 DY030OPERATING WEIGHT (lb)* 2440 2650 2900 3100 2930 3140COMPRESS

Fig. 42 — Charging Chart; 50DJ,DK,DW,DY024;System 1Fig. 43 — Charging Chart; 50DJ,DK,DW,DY024;System 2Fig. 44 — Charging Chart; 50DJ,DK,DW,DY028;Syste

Refrigerant Feed Components — Each refrigerantcircuit (2 per unit) has all the necessary refrigerant controls:Thermostatic Expansion Valve (TXV) — Eac

Table 21 — Pressure Switch Settings (psig)SWITCH CUTOUT CUT-INHigh 426 6 7 320 6 20Low 27 6 46767Control Circuit, 24 V — This control circuit is pro-t

Table 25 — Economizer Control Board Checkout,Test 3MOTORTESTPROCEDUREEXPECTED RESULTAND RESPONSEATurn mixed-air potenti-ometer to the midpointposition

LEGENDC—ContactorMAT — Mixed-Air ThermistorPL — PlugRA — Return-AirSTAT — ThermostatNOTES:1. Relay contacts 1K and 2K are shown in high enthalpy posit

4. Turn unit power off and disconnect plug P4 from thecontrol board.5. Turn unit power on and check for continuity acrossPin 6 and Pin 3 at plug P4 on

b. Connect the multimeter to read voltage betweenPin X at plug P1 and ground.c. Turn unit power on and check the multimeter. Withina few seconds the m

d. Turn unit power off. Connect a fresh 1.5-v battery toterminals marked CLO2 as shown in Fig. 51.The negative (−Ve) pole of the battery must be con-n

TROUBLESHOOTING, VAV UNITSVAV Diagnostic Information —The microproces-sor contains extensive self-diagnostic information. The dis-play board is used t

CODES 59 AND 60: LOW-PRESSURE SWITCH — Thesecodes are used to indicate a low-pressure switch failure. Sincethe 50DK,DY024-030 units have low-pressure

NOTES:1. Roof curb accessory 50DJ900391 is shippedunassembled.2. Dimensions in ( ) are millimeters.3. Roof curb: 18 gage steel.4. The 028 and 030 unit

For both, the control uses only 80% of the total potenti-ometer resistance. If resistance of potentiometer is less than10% or greater than 90%, alarm

4. Turn power switch to ON position and press display but-ton to enter quick test mode.5. Check voltage between TP20 and each of the followingtest pin

RELAY BOARD CHECKOUTStep 1 — Low-voltage relay resistance check.1. Turn switch to OFF position.2. Remove plug connection from terminal strip J6.3. Set

START-UP CHECKLISTMODEL NO.:DATE:SERIAL NO.:TECHNICIAN:PRE-START-UPM VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNITM REMOVE ALL SHIPPIN

NOTES:1. Roof curb accessory 50DJ900401 is shippedunassembled.2. Dimensions in ( ) are millimeters.3. Roof curb: 18 gage steel.4. The 028 and 030 unit

Alternate Unit Support Methods — Where the pre-ferred curb or slab mount cannot be used, support unit withsleepers on perimeter, using curb support ar

UNIT50DJ,DKWEIGHT* A B C D E FLb Kg mm ft-in. mm ft-in. mm ft-in. mm ft-in. mm ft-in. mm ft-in.024 2440 1107 1244.6 4-1 1680.0 5-61⁄83141.0 10-311⁄165