A50-7275ef, Modular Unit VAV Control Panel | Carrier 50BV020-064

a50-7275ef

TRANS-1

a50-7275ef

TB2

PCB1

CSMUX

TB2

Fig. 27 — Modular Unit VAV Control Panel

TRANS-1

a39-1867t

PCB1

Fig. 29 — Supply/Return Air Temperature

Sensor (P/N HH79NZ043)

a50-7276ef

Fig. 28 — Single-Piece Unit VAV Control Panel

39-312d

Fig. 30 — Supply-Air Temperature Sensor

Installation (Unit Discharge Location)

29

Image 29

Carrier 50BV020-064 a50-7275ef, Modular Unit VAV Control Panel, a39-1867t, Supply/Return Air Temperature, a50-7276ef

Contents

SAFETY CONSIDERATIONS Installation, Start-Upand Service InstructionsCONTENTS GENERAL MAJOR SYSTEM COMPONENTS Constant Volume CV Units Step 1 - Complete Pre-InstallationChecks INSTALLATIONTable 2 - Modular Unit Shipping Table a50-7257ef Fig. 2 - 50BVC,J,Q020-034Dimensions Fig. 3 - 50BVE,K020-034Dimensions a50-8201 Fig. 4 - 50BVT,V,W034 High-BoyDimensions Fig. 5 - 50BVT,V,W034 Low-BoyDimensions Fig. 6 - 50BVT,V,W044-064 High-BoyDimensions Fig. 7 - 50BVT,V,W044-064 Low-BoyDimensions Fig. 8 - 50BVU,X034 High-BoyDimensions Fig. 9 - 50BVU,X034 Low-BoyDimensions Fig. 10 - 50BVU,X044-064 High-BoyDimensions Fig. 11 - 50BVU,X044-064 Low-BoyDimensions a50-7306ef NOTES 1.Dimensions in inches mm a50-7307ef NOTES 1.Dimensions in inches mm Size 034 Units Size 044-064Units Shipping Weights lba50-8235 Table 3A - Physical Data - 50BVC,E,J,K,Q Table 3B - Physical Data - 50BVT,U,V,W,X Multiple Fan Units Fig. 15 - Typical Fan Discharge Connections for Fig. 16 - Duct Static Pressure Probe a50-7138efP/N 39EK20462 a50-7267ef Step 4 - Make Piping Connections Fig. 19 - DHS Limit Switch P/Na50-8253 Fig. 18 - DHS Pressure Limit Location 50BVC,J,Q Units Table 5A - Condenser Pressure DropTable 5B - Condenser Pressure Drop 50BVT,V,W Units 50BVC,E,J,K,Q Units Table 6A - Hot Water Pressure DropTable 6B - Hot Water Pressure Drop 50BVT,U,V,W,X Units Table 7B - Economizer Pressure Drop Curve Step 5 - Complete Electrical Connectionsft wg, 50BVT,U,V,W,X Units a50-7270ef Table 9A - Electrical Data - 50BVC,E,J,K,Q Table 9B - Electrical Data - 50BVT,U,V,W,X Two-StageCooling Units Fig. 24 - Typical Wiring 18 to 30 Ton Unitsa50-7272ef Table 10 - Recommended Cables a50-7273efa50-7164tf Fig. 26 - Field Terminal Block a50-7275ef Installation Unit Discharge LocationFig. 27 - Modular Unit VAV Control Panel a39-1867t Table 11 - Thermistor Resistance vs Temperature START-UPValues for Supply-AirTemperature Sensor 10 Kilo- ohm Table 13 - Fan Performance - 50BVC,E,Q020 CV Unit Start-Up Table 14 - Fan Performance - 50BVC,E,Q024 Table 15 - Fan Performance - 50BVC,E,Q028 Table 16 - Fan Performance - 50BVC,E,Q034 Table 17 - Fan Performance - 50BVT,U,V034 Table 17 - Fan Performance - 50BVT,U,V034 cont Table 18 - Fan Performance - 50BVT,U,V044 Table 19 - Fan Performance - 50BVT,U,V054 Table 19 - Fan Performance - 50BVT,U,V054 cont Table 20 - Fan Performance - 50BVT,U,V064 Table 20 - Fan Performance - 50BVT,U,V064 cont VAV Unit Start-Up 02-06-04 OMNIZONE VPACFig. 32 - LID a50-7425ef Fig. 33 - 50BV VFD Display The LID display will show Year Table 23 - Software Points Table 21 - Controller Set PointsTable 22 - Controller Hardware Points Table 24 - Configuration Parameters Unoccupied space or return air temperature demand MAINTENANCE SERVICE Fig. 34 - Gravity Flow Method a50-186tfa50-187tf Fig. 35 - Forced Circulation Method TROUBLESHOOTING Evaporator Fan Performance AdjustmentCharging the System a50-7135tf POSSIBLE CAUSE PROBLEM PROBLEM Table 28 - Unit TroubleshootingCORRECTION PROCEDURE POSSIBLE CAUSE Table 31 - Clearing a Forced Input or Output Table 29 - CV Units LED Diagnostic CodesTable 30 - Forcing an Input or Output Page Page Page Page UNIT WIRING FIELD WIRINGPage WIRE LEGEND FIELD WIRINGa50-7282ef TRANS-1 PCB2 J1 FIELD WIRING PCB1 FIELD WIRINGUNIT WIRING PCB1 FIELD WIRING LEGEND AND NOTES FOR FIG Catalog No Copyright 2008 Carrier CorporationForm 50BV-3SI 10-08 I. PRELIMINARY INFORMATION START-UPCHECKLISTII. PRE-START-UP CONTROLS III.START-UP