Installation Guide for Carrier 14ASI Remote Evaporator

Quick Guide from the Manual

This document provides installation instructions for the Carrier 14ASI remote evaporator mounting accessory used with 30RC units. The system utilizes A2L (R-32) refrigerant, which requires specific safety precautions, including proper ventilation, leak detection, and handling procedures. Only trained, qualified installers should perform these operations.

Safety Considerations

Installation involves system pressures, electrical components, and elevated locations. Observe the following:

• A2L Refrigerant (R-32): This refrigerant is flammable. Do not use a torch to remove components.
• Leak Detection: A leak detector compliant with UL 60335-2-40 Annex LL is required, set to trip at 25% of the Lower Flammability Limit (LFL).
• Ventilation: Ensure adequate ventilation in enclosed or low-overhead areas to prevent refrigerant accumulation.
• Electrical Safety: Shut off all power and tag disconnect locations before starting work.

Installation Overview

The installation process involves relocating the evaporator to an indoor space. Key steps include:

1. Inspect package contents and verify the new location can support the evaporator weight.
2. Turn off electrical power and perform lockout/tag-out procedures.
3. Recover refrigerant charge from all circuits before cutting lines.
4. Disconnect existing thermistors, water piping, flow switch cables, and EXV cables.
5. Transport the evaporator to the new location and secure it vertically.
6. Reinstall the filter drier, EXV, and service valve assembly.
7. Install field-supplied liquid and suction lines, ensuring proper sizing.
8. Install pressure relief valves on new liquid lines.
9. Perform leak testing and dehydration vacuum procedures.
10. Reconnect electrical components, including thermistors and EXV cables, using the provided junction box and extension cables.

Piping and Connections

Follow these guidelines for piping:

• Maximum Separation: 75 linear ft (22 m) for plate fin coils; 50 linear ft (15 m) for microchannel coils.
• Elevation: Maximum evaporator elevation above the condensing section is 15 ft (4.5 m).
• Insulation: Minimum R-value of 25 (m deg. K/W) is recommended for suction and water lines.
• Brazing: Use a nitrogen purge while brazing. Remove pressure transducers, Schrader cores, thermistors, and fusible plugs before brazing to avoid damage.

Refrigerant Charging

The system requires additional refrigerant based on the separation distance and line sizes. Refer to the following:

• Charging: Charge at the liquid line. Do not charge into the suction line.
• Calculations: Use Table 4 for estimated additional charge per 100 ft of tubing. Apply temperature correction factors from Table 5 if necessary.
• Verification: Use the nameplate charge amount or Table 6 for initial charging. Adjust based on actual operating conditions.

Wiring and Electrical

A normally open relay must be wired between TB5-1 and TB5-2 to shut down the chiller if a leak is detected. Use the provided 5-wire jacketed cable to connect thermistor leads in the junction box back to the base unit control box. Ensure all splices are soldered and insulated to prevent short circuits.