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Carrier 50EY, 50EW, 50EK Troubleshooting, Ð Typical Refrigerant Circuiting, 50EJ,EK,EW,EY024-034

Models: 50EK 50EY 50EW 50EJ

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TROUBLESHOOTING

TROUBLESHOOTING

Typical refrigerant circuiting diagrams are shown in Fig. 43-45.

LEGEND

FPS Ð Freeze Protection Switch

HPS Ð High-Pressure Switch

LPS Ð Low-Pressure Switch

Fig. 43 Ð Typical Refrigerant Circuiting

(50EJ,EK,EW,EY024-034)

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Carrier 50EY, 50EW, 50EK installation instructions Troubleshooting, Ð Typical Refrigerant Circuiting, 50EJ,EK,EW,EY024-034

Contents

INSTALLATION Step 1 Ð Provide Unit Support CONTENTSIMPORTANT Ð READ BEFORE INSTALLING SAFETY CONSIDERATIONSUNIT LEVELING TOLERANCES DIMENSIONS Fig. 1 Ð Roof Curb SizesDegrees and Inches UNIT LEVELING TOLERANCES DIMENSIONS Fig. 2 Ð Roof Curb SizesDegrees and Inches Fig. 3 Ð Base Unit Dimensions, 50EJ/EK024-034 UNIT SIZE Fig. 5 Ð Base Unit Dimensions, 50EW/EY024-034 UNIT SIZE NOTICE TO RIGGERS ALL PANELS MUST BE IN PLACE WHEN RIGGINGFig. 7 Ð Rigging Label Factory Speed Setting rpm Table 1 Ð Physical DataOPERATING WEIGHT lb HIGH-PRESSURESWITCH psigFactory Speed Setting rpm Table 1 Ð Physical Data contOPERATING WEIGHT lb HIGH-PRESSURESWITCH psigFig. 8 Ð Air Distribution Ð Thru-the-Bottom Step 4 Ð Make Unit Duct ConnectionsTable 2 Ð Evaporator Fan Motor Data Fig. 9 Ð Air Distribution Ð Thru-the-SideFeatures with Thermostat Control of Unit Fig. 11 Ð Field Control Remote Start/Stop Fig. 12 Ð Control Board Diagram Fig. 13 Ð Field Power Wiring Connections Step 7 Ð Make Electrical Connections1.Remove cap from red 208-vwire Table 4 Ð Electrical Data Ð 50EJ,EK,EW,EY024-048 150/150 200/200 225/200 225/225 23.6 23.6 PEC − Power Exhaust Controller Fig. 14 Ð Control Box Diagram SizesFig. 15 Ð Control Box Diagram Sizes PEC Ð Power Exhaust ControllerFig. 17 Ð Field Control Temperature Sensor Wiring Step 8 Ð Make Outdoor-AirInlet AdjustmentsFig. 16 Ð Field Control Thermostat Wiring Table 5 Ð CCN Connection Approved Shielded CablesFig. 20 Ð Adding Seal Strip to Fig. 18 Ð Adding Seal Strip to Top of Hood SidesMounting Flange of Hood Sides Hood Top Mounting Flange Attached to Filter Track AssemblyFig. 21 Ð Adding Seal Strip to Fig. 22 Ð Adding Foam Strip to Cross MemberFig. 27 Ð Attaching Seal Strip to Filter Cover Fig. 29 Ð Wire Connections for Solid StateFig. 30 Ð Psychrometric Chart for Fig. 28 Ð Differential Enthalpy ControlFig. 31 Ð Barometric Relief Damper and Power Exhaust Mounting DetailsFig. 32 Ð Pressure Transducer Locations Fig. 33A Ð Motormaster III Sensor Location SizesFig. 33C Ð Motormaster III Sensor Location START-UP Table 8 Ð Potentiometer Signal Levels Direct Digital Controls DIP Switch ConguraTable 9 Ð Power Exhaust Default Set Points SETTING Sequence of Operation AIRFLOW AVAILABLE EXTERNAL STATIC PRESSURE in. wg Table 15 Ð Air Quantity Limits Table 16 Ð Motor Limitations Table 17 Ð User Dened Set PointsThe control module will operate economizer, run diag- nostics to monitor alarms/alerts at all times, and respond to CCN communications to perform any congured network POC product outboard control functions such as time/ outdoor-airtemperature broadcast and global occupancy broad- cast. When the optional expansion I/O board is employed, it will perform a periodic scan and maintain a database of ex- panded I/O points perform Fire/Smoke control power ex- haust required if in Occupied mode, perform IAQ control and monitor the fan, lter, demand limit, and eld-appliedstatus with accessories Fig. 35 Ð Heat Interlock Relay Wiring Fig. 36 Ð Space Temperature Sensor WiringCV Units with 2 Compressors SERVICETable 18 Ð Cooling Capacity Staging Table Table 19 Ð Cooling Capacity Staging TableLubrication Evaporator Fan Service and Replacementand Adjustment Fig. 38 Ð Evaporator-FanPulley AlignmentEvaporator-FanMotor Replacement Belt Tension Adjustment Ð To adjust belt tensionCondenser-FanAdjustment Fig. 39 Ð Belt Tension AdjustmentFig. 41 Ð Cooling Charging Chart Sizes Fig. 42 Ð Cooling Charging Chart SizesFig. 43 Ð Typical Refrigerant Circuiting TROUBLESHOOTING50EJ,EK,EW,EY024-034 LEGEND FPS Ð Freeze Protection Switch Fig. 44 Ð Typical Refrigerant Circuiting50EJ,EK,EW,EY038,044 HPS Ð High-PressureSwitchLEGEND FPS Ð Freeze Protection Switch Fig. 45 Ð Typical Refrigerant Circuiting50EJ,EW048 HPS Ð High-PressureSwitchTable 20 Ð Control Board LED Alarms Table 22 Ð I/O Channel Designations Table 21 Ð I/O Channel DesignationsBase Module Ð CV Base Module Ð VAVTable 23 Ð I/O Channel Designations Expansion Module Ð CV and VAVPage Page PACKAGED SERVICE TRAINING PRE-START-UP START-UPCHECKLISTTEMPERATURES ELECTRICALSTART-UPCHECKLIST cont GENERAL