Carrier 50BV020-064 - Manuals

20 acceptable system static pressure. If the existing duct system is too small, larger ductwork must be installed. The duct system and diffusers should be sized to handle the design airflow volumes quietly. To maximize sound attenuation of the unit's blower(s), the supply and return air plenums shou...

21 Step 4 — Make Piping Connections CONDENSER WATER PIPING (Water-Cooled Only) — Always follow national and local codes when installing water piping to ensure a safe and proper installation. Connections to the unit should incorporate vibration eliminators to reduce noise and vibration to the buildin...

22 Table 5A — Condenser Pressure Drop 50BVC,J,Q Units LEGEND Table 5B — Condenser Pressure Drop 50BVT,V,W Units LEGEND Pressure and temperature ports are recommended in both the supply and return lines for system flow balancing. These openings should be 5 to 10 pipe diameters from the unit water con...

23 Table 6A — Hot Water Pressure Drop 50BVC,E,J,K,Q Units LEGEND Table 6B — Hot Water Pressure Drop 50BVT,U,V,W,X Units LEGEND Pipe sizes should be selected based on the head pressure available from the pump. Water velocity should not exceed 8 fps. Design the piping system for approximately 3 ft of ...

24 Table 7B — Economizer Pressure Drop Curve (ft wg), 50BVT,U,V,W,X Units LEGEND REMOTE REFRIGERANT PIPING (Remote Air-Cooled Only) — Carrier 50BVE,K,U,X units are supplied without condensers. To complete the installation, these units must be field connected to a suitable remote condenser. The 50BV ...

27 Modular Units — For units with multiple main air- conditioning sections, connect the high voltage compressor power wiring to the line side of the high voltage terminal block in the second section’s high voltage electrical box. This wiring is located in the upper portion of the compressor compartm...

28 Table 10 — Recommended Cables NOTE: Conductors and drain wire must be at least 20 AWG (American Wire Gage), stranded, and tinned copper. Individual conductors must be insulated with PVC, PVC/nylon, vinyl, Teflon ® *, or polyethylene. An aluminum/polyester 100% foil shield and an outer jacket of P...

29 TRANS-1 PCB1 TB2 CSMUX PCB1 TB2 TRANS-1 Fig. 27 — Modular Unit VAV Control Panel Fig. 28 — Single-Piece Unit VAV Control Panel Fig. 29 — Supply/Return Air Temperature Sensor (P/N HH79NZ043) Fig. 30 — Supply-Air Temperature Sensor Installation (Unit Discharge Location) a50-7275ef a50-7276ef a39-18...

30 Table 11 — Thermistor Resistance vs Temperature Values for Supply-Air Temperature Sensor (10 Kilo- ohm) SMOKE DETECTOR/FIRE ALARM SHUTDOWN (FSD) — To allow a smoke detector to shut the 50BV down, remove the jumper from FSD to C and wire these terminals to a set of normally closed contacts on the ...

31 when it starts. Also, no cooling will be produced at the evaporator. If any of these conditions occurs, refer to the Service section to correct the compressor rotation before continuing.INTERNAL WIRING — Check all electrical connections in unit control boxes; tighten as required.RETURN-AIR FILTER...

47 DISPLAY ALARM HISTORY — If the controller is indicat-ing there are alarms, the user can view the alarm history bypressing the button. The LID display will show “Alarm History.” Press . The LID display will show the date and type of alarm. As an example, if the LID display shows:ALARM — 10:55 02-1...

48 Sequence of Operation (VAV Only) — The fol- lowing control sequence of operation for the VAV units de- scribes the various sequences that occur depending upon the way an operation is triggered and which software control points are involved.SUPPLY FAN — The supply fan can be activated in any of th...

50 GRAVITY FLOW METHOD (Fig. 34) — Do not add solu- tion faster than the vent can exhaust the generated gases. When condenser is full, allow the solution to remain over- night then drain the condenser and flush with clean water. Fol- low acid manufacturer’s instructions.FORCED CIRCULATION METHOD (Fi...

51 Evaporator Fan Performance Adjustment — To change fan speeds from factory settings: 1. Shut off unit power supply.2. Loosen nuts on the 4 carriage bolts in the mounting base. Using adjusting bolts and plate, slide the motor and remove the belt. 3. Loosen movable-pulley flange setscrew. 4. Screw t...

52 Table 27 — Run Test Troubleshooting (VAV Units Only) NOTE: For more information on VAV controls, refer to the 50BV,XJ Controls Operation and Troubleshooting Manual. PROBLEM POSSIBLE CAUSE Control modules do not have lights when unit power is on. Transformer open. Circuit breaker open. Power wirin...

53 Table 28 — Unit Troubleshooting LEGEND PROBLEM POSSIBLE CAUSE CORRECTION PROCEDURE Unit Will Not Start. Loss of unit power Check power source.Check fuses, circuit breakers, disconnect switch.Check electrical contacts. Unit voltage not correct Check and correct. Open fuse Check for short circuit i...

54 Table 29 — CV Units LED Diagnostic Codes *Freeze protection and condensate overflow lockout require optionalsensors.NOTE: The main control board has a red LED (light-emitting diode)for fault indication and will blink a code as described above. Countthe number of blinks to determine the lockout co...

59 L1 L2 L3 T3 T2 COMPR2 CLO2 CURRENT LOOP CC2 T1 L3 L2 L1 COMPR 1 CC1 T2 T3 T1 CURRENT LOOP CLO1 TRANS-1 CBR PCB1 (J1-3) COMMON TBLK BM BM T2 L2 L3 T3 BR L1 T1 T2 L2 L3 T3 BR L1 T1 W VFD E U V R S T2 T3 T1 1 3 2 BYP ASS ) GND 4 5 6 L3 L1 L2 TRANFORMER PRIMAR Y LEAD CLR: - PUR OR YEL - BLK/RED 460 5...

63 TRANS-1 (24V AC) CBR 1 2 16 3 14 13 12 15 5 4 6 7 10 9 8 11 2 1 3 5 1 2 4 3 8 6 7 10 9 13 12 11 14 15 16 ALARM RED +- + W ARN - - IN OUT SPEED VIA CC P24 CC S1 R SF 5 3 BYP AS VFD1 SF + - CMP1 CLO1 LOGIC 1 2 3 + - CLO2 LOGIC 2 - 1 3 + CMP2 17 18 S 1 3 2 4 V C EWT DHS 5 3 ROCC 5 CDWF 3 5 3 FSD 4 6...

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53500001-01 Printed in U.S.A. Form 50BV-3SI Pg CL-2 10-08 Replaces: 50BV-2SI Copyright 2008 Carrier Corporation - - - - - - - - - - - - - ...