Contents

SAFETY CONSIDERATIONS
GENERAL
- Step 1 Complete Pre-Installation Checks
- Step 2 Rig and Place Unit
  - PLACING THE UNIT
- Step 3 Install Additional Vibration Isolation (if required)
- Step 4 Install Ductwork
  - CONDENSER AIR DUCT
  - CONDENSER AIRFLOW LOUVERS
  - EVAPORATOR DUCTWORK
- Step 5 Install Condensate Drain Line
- Step 6 Complete Electrical Connections
  - GENERAL
  - UNBALANCED 3-PHASE SUPPLY VOLTAGE
  - POWER WIRING
  - CONTROL WIRING
  - WINTER START MODIFICATIONS
- Step 7 Install Plenums (if required)
- Step 8 Check Fan Sheave and Belt Alignment
  - ALIGNMENT
  - V-BELTS
START-UP
- General
- Compressor Rotation
- Operating Sequence
  - ROOM-MOUNTED THERMOSTAT
  - COOLING
  - HEATING
  - ALL UNITS
- Low Ambient Operation (Factory Installed)
- 2-Speed Fan Operation Sequence
- Configuration of Low Ambient Kit (Field Installation)
SERVICE
- Cleaning Evaporator and Condenser Coils
- Lubrication
- Condenser Fan Adjustment
- Pulley Alignment
- Belt Tension Adjustment
- Changing Fan Wheel
- Fan Bearing Replacement
- Concentric Alignment
- Evaporator and Condenser Motor Starter Setting (after Lockout/Tagout)
MAINTENANCE
- Cleaning
- Inspection
- Air Filters
- Condensate Drain
- 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 Switch
- Oil Charge
TROUBLESHOOTING
START-UP CHECKLIST

Carrier 50XCA Installation Instruction

Pages 48

Year 2020

Language(s)

of 48

Carrier 50XCA Specification

The Carrier 50XCA is an advanced rooftop unit designed for commercial heating, ventilation, and air conditioning applications. It offers a balance of performance, efficiency, and reliability, catering to both large and small-scale enterprises. Featuring a robust scroll compressor, the unit ensures optimal energy consumption while delivering consistent cooling and heating. The 50XCA is equipped with a high-efficiency coil system, enhancing heat transfer and minimizing energy loss. This rooftop unit supports environmentally friendly refrigerant options, aligning with modern sustainability standards and reducing its carbon footprint.

The unit's design emphasizes ease of installation and maintenance, with accessible panels and straightforward electrical connections that streamline service processes. It incorporates an adaptive control system, providing precise temperature management and improved indoor air quality. This system is compatible with various building management systems, allowing for seamless integration into existing infrastructures. The Carrier 50XCA also includes advanced diagnostics, enabling quick troubleshooting and reducing downtime.

Durability is a key feature, with corrosion-resistant materials and a weather-resistant casing ensuring longevity even in harsh climates. Noise reduction measures are in place, making it suitable for installations where acoustic control is a priority. The 50XCA can be customized to meet specific operational needs, with options for economizers, power exhaust, and other enhancements. Overall, the Carrier 50XCA stands out as a versatile and efficient solution for commercial HVAC requirements, offering a reliable performance tailored to modern business needs.

Carrier 50XCA F.A.Q.

How do I perform routine maintenance on my Carrier 50XCA unit?

To perform routine maintenance, ensure the unit is powered off, clean the filters, inspect and clean the condenser coils, check for refrigerant leaks, and verify electrical connections for any signs of wear or damage.

What should I do if my Carrier 50XCA is not cooling effectively?

If the unit is not cooling effectively, check the thermostat settings, ensure the air filters are clean, inspect the condenser coils, and verify that the refrigerant levels are adequate.

How can I reset the Carrier 50XCA unit after a power outage?

To reset the unit after a power outage, turn off the thermostat, switch off the power supply to the unit, wait for about 5 minutes, then restore power and turn the thermostat back on.

What is the recommended frequency for changing the air filters in my Carrier 50XCA?

It is recommended to check and potentially replace the air filters every 1-3 months, depending on usage and environmental conditions.

Why is my Carrier 50XCA unit making unusual noises?

Unusual noises may indicate loose components, debris in the unit, or issues with the fan motor. Inspect the unit for any visible problems and tighten any loose parts.

How can I improve the energy efficiency of my Carrier 50XCA?

To improve energy efficiency, regularly clean or replace the air filters, ensure proper insulation around the unit, and schedule annual professional maintenance checks.

What steps should I take if the Carrier 50XCA unit is leaking water?

If the unit is leaking water, check the drain line for clogs, ensure the condensate pump is functioning properly, and inspect the unit for any ice buildup.

Can I operate the Carrier 50XCA in cold weather conditions?

While the Carrier 50XCA can operate in cooler temperatures, it is important to monitor the defrost cycle and ensure that ice does not build up on the coils.

How do I troubleshoot a Carrier 50XCA unit that won't start?

If the unit won't start, check the power supply, ensure that the thermostat is set correctly, and inspect the circuit breaker and fuses.

What is the best way to clean the condenser coils on a Carrier 50XCA?

To clean the condenser coils, turn off the unit, remove debris with a soft brush, and use a coil cleaner spray. Rinse gently with water and let dry before restoring power.