Flushing Existing Line Set and Indoor Coil

This procedure should not be performed on systems which contain contaminants, such as compressor burn out.

Required Euipment

The following equipment is needed to flush the existing line set and indoor coil (See Figure 9). Two clean R-22 recovery bottles, an oil-less recovery machine with a “pump down” feature, and two sets of gauges (one for use with R-22 and one for use with R410A).

Flushing Procedure

IMPORTANT: The line set and/or indoor coil must be flushed with at least the same amount of refrigerant that previously charged the system. Check the charge in the flushing cylinder before flushing the unit.

1.Remove existing R-22 refrigerant using the appropriate procedure.

If the existing outdoor unit is not equipped with shutoff valves, or if the unit is not operational AND the existing R-22 refrigerant will be used to flush the system:

Disconnect all power to the existing outdoor unit. Connect the existing unit, a clean recovery cylinder, and the recovery machine according to the instructions provided with the recovery machine. Remove all R-22 refrigerant from the existing system. Refer to the gauges after shutdown to confirm that the entire system is completely void of refrigerant. Disconnect the liquid and suction lines from the existing outdoor unit.

If the existing outdoor unit is equipped with manual shutoff valves AND new R-22 refrigerant will be used to flush the system:

Start the existing R-22 refrigerant system in cooling mode and close the liquid line valve. Pump all the existing R-22 refrigerant back into the outdoor unit.

(It may be necessary to bypass the low pressure switches to ensure complete refrigerant evacuation.)

When the low side system pressures reach 0 psig, close the suction line valve. Disconnect all power to the existing outdoor unit. Refer to the gauges after shutdown to confirm that the valves are not allowing refrigerant to flow back into the low side of the system. Disconnect the liquid and suction lines from the existing outdoor unit.

2.Remove the existing outdoor unit. Set the new R410A unit and follow the brazing connection procedure outlined previously on this page to make line set connections. Do not install the R410A thermal expansion valve at this time.

3.Make low voltage and line voltage connections to the new outdoor unit. Do not turn on power to the unit or open the outdoor unit service valves at this time.

Flushing Connections

Figure 9

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Allied Air Enterprises 4AC18LT manual Required Euipment, Flushing Procedure
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4AC18LT specifications

Allied Air Enterprises has made significant strides in the HVAC industry with the introduction of its 4AC18LT air conditioner. This model is part of a premium line of products that emphasizes efficiency, reliability, and advanced cooling technology. The 4AC18LT is specifically designed to meet the diverse needs of both residential and light commercial applications, making it a versatile choice for many consumers.

One of the standout features of the 4AC18LT is its impressive Seasonal Energy Efficiency Ratio (SEER) rating. With a SEER rating of up to 18, this unit is engineered to provide excellent energy efficiency, significantly reducing electricity consumption while delivering consistent cooling performance. As energy costs continue to rise, homeowners and businesses can benefit greatly from this efficiency, leading to lower monthly utility bills and a reduced carbon footprint.

The 4AC18LT employs advanced R-410A refrigerant, which is known for its environmentally friendly properties. Unlike older refrigerants that contribute to ozone depletion, R-410A is more stable and offers better heat transfer capabilities, which enhances the overall performance of the unit. This focus on eco-friendliness aligns with contemporary environmental standards and regulations, ensuring that users are making a responsible choice for their cooling needs.

In terms of design, the 4AC18LT features a robust and compact frame that is built to withstand the rigors of outdoor installation. The unit's durability is further enhanced by its corrosion-resistant finish, which protects the coil and cabinet from harsh weather conditions, extending the life span of the system.

Noise reduction technology is another highlight of the 4AC18LT. This model is designed with a quieter operation in mind, utilizing a sound blanket and insulated compressor compartment. These features work together to minimize noise levels, allowing users to enjoy a comfortable indoor environment without disruptive sound.

The 4AC18LT also supports advanced controls and compatibility with smart thermostats, providing users with greater flexibility and convenience. Homeowners can take advantage of programmable features, enabling them to optimize cooling schedules for energy savings and increased comfort.

Overall, Allied Air Enterprises’ 4AC18LT air conditioner combines efficiency, environmental responsibility, durability, and user-friendly features, making it an excellent choice for those in need of reliable cooling solutions. Whether installed in a residential or light commercial setting, the 4AC18LT promises to deliver exceptional performance and peace of mind.
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