Contents

SAFETY CONSIDERATIONS
GENERAL
INSTALLATION
- Step 1 Complete Pre-Installation Checks
- Step 2 Rig and Place Unit
  - PLACING THE UNIT
- Step 3 Install Evaporator (Supply) Ductwork
- Step 4 Install Return-Air Ductwork
- Step 5 Check Return-Air Filters
- Step 6 Make Condenser Connections
- Step 7 Install Condensate Drain Line
- Step 8 Complete Electrical Connections
  - GENERAL
  - UNBALANCED 3-PHASE SUPPLY VOLTAGE
  - POWER WIRING
  - CONTROL WIRING
  - FREEZE PROTECTION THERMOSTAT
- Step 9 Install Piping
  - HOT WATER PIPING
  - HOT WATER CONTROLS
  - STEAM COIL PIPING
  - STEAM COIL CONTROLS
- Step 10 Install Plenums (if Required)
- Step 11 Check Fan Sheave and Belt Alignment
  - ALIGNMENT
  - V-BELTS
START-UP
- General
- Compressor Rotation
- Operating Sequence
  - ROOM-MOUNTED THERMOSTAT
  - FAN CIRCULATION
  - COOLING
  - HEATING (IF EQUIPPED WITH HOT WATER OR STEAM COIL)
  - ECONOMIZER OPERATION
  - 2-SPEED FAN OPERATION SEQUENCE
  - ALL UNITS
- Water Regulating Valve
SERVICE
- Cleaning Evaporator Coil
- Lubrication
- Indoor Fan Adjustment
  - TO CHANGE FAN SPEED
- Pulley Alignment
- Belt Tension Adjustment
- Changing Fan Wheel
- Fan Bearing Replacement
- Concentric Alignment
- Evaporator Motor Starter Setting (after Lockout/ Tagout)
MAINTENANCE
- Cleaning
- Inspection
- Condensate Drain
- Water-Cooled Condensers
  - GRAVITY FLOW METHOD (Fig. 32)
  - FORCED CIRCULATION METHOD (Fig. 33)
- Cleaning Heating Coils
- Cleaning Steam Coils
- Checking System Charge
- Access Panel Removal
  - TOP PANEL
  - CONTROL PANEL
  - BOTTOM PANEL
- Evaporator-Fan Motor Removal
- Pressure Relief Device
- Current Protection Device
- High and Low-Pressure Switches
- Oil Charge
TROUBLESHOOTING
START-UP CHECKLIST

Carrier 50XCW Installation Instruction

Pages 44

Year 2020

Language(s)

of 44

Carrier 50XCW Specification

The Carrier 50XCW is a high-performance rooftop air conditioning unit designed for commercial applications, offering efficient temperature control and optimized energy usage. The unit features a robust scroll compressor, which ensures reliable operation and minimizes sound levels, making it suitable for urban environments where noise pollution is a concern. The 50XCW model is equipped with an advanced microchannel condenser coil that enhances heat transfer capabilities while reducing refrigerant charge requirements. This not only improves the unit's overall efficiency but also contributes to environmental sustainability.

The unit supports a wide ambient operating range, ensuring consistent performance in varying climatic conditions. It includes an intuitive control system with precise temperature management, allowing for easy integration with building management systems. The control panel offers diagnostic capabilities, enabling quick troubleshooting and maintenance, which reduces downtime and operational costs.

Constructed with durable, corrosion-resistant materials, the Carrier 50XCW is engineered to withstand harsh weather conditions, prolonging its operational lifespan. The unit's compact design facilitates straightforward installation, even in space-constrained locations, and its modular construction allows for convenient access during service procedures.

To meet diverse application needs, the 50XCW is available in multiple capacity options, catering to different cooling requirements. Its energy-efficient design is compliant with current regulatory standards, ensuring reduced energy consumption and lower operational expenses. The Carrier 50XCW represents a blend of innovative engineering and practical functionality, making it a reliable choice for businesses seeking effective climate control solutions in commercial settings.

Carrier 50XCW F.A.Q.

How do I perform a basic startup of the Carrier 50XCW unit?

Ensure all electrical connections are secure, then power on the unit. Check the control panel for any alerts and set the desired temperature settings.

What are the routine maintenance tasks for the Carrier 50XCW?

Routine maintenance includes checking and cleaning filters, inspecting electrical connections, and verifying refrigerant levels. Regularly ensure that the coils are clean and free of debris.

How can I troubleshoot a Carrier 50XCW that is not cooling effectively?

Check the thermostat settings and verify that the air filters are clean. Inspect for any refrigerant leaks and ensure that the condenser coils are not blocked.

Why is the Carrier 50XCW unit making unusual noises?

Unusual noises can be due to loose components, debris in the fan, or a failing compressor. Inspect the unit for any visible issues and tighten loose parts if necessary.

How do I reset the Carrier 50XCW unit after a power failure?

Turn off the main power to the unit for about five minutes, then turn it back on. This allows the system to reset. Check the control panel for any errors and clear them if necessary.

What should I do if the Carrier 50XCW displays an error code?

Refer to the unit's manual for specific error codes. Common solutions involve checking connections, resetting the unit, and verifying settings. Professional assistance may be required for persistent issues.

How do I ensure the Carrier 50XCW unit operates efficiently?

Regular maintenance is key. Keep filters, coils, and vents clean. Ensure the correct refrigerant level and optimize thermostat settings to avoid excessive energy use.

What steps should be taken if the Carrier 50XCW unit is short cycling?

Short cycling could be due to thermostat issues or refrigerant problems. Check the thermostat settings and inspect the refrigerant level. Consult a professional if the problem persists.

How can I prevent water leakage from the Carrier 50XCW unit?

Regularly check and clean the drain line to prevent clogs. Ensure the unit is properly leveled to facilitate proper water drainage.

What is the recommended interval for professional servicing of the Carrier 50XCW?

It is recommended to have the unit professionally serviced at least once a year to ensure optimal performance and to address any potential issues early.