Allied Air Enterprises 4AC18LT Refrigerant Metering Device, Expansion Valve Systems, TXV Data

Page 9

4.Remover the existing R-22 refrigerant flow control orifice or thermal expansion valve before continuing with flushing procedures. R-22 flow control devices are not approved for use with R410A refrigerant and may prevent proper flushing. Use a field-provided fitting to reconnect the lines.

5.Remove the pressure tap valve cores from the 4AC18LT units service valves. Connect an R-22 cylinder with clean refrigerant to the suction service valve. Connect the R-22 gauge set to the liquid line valve and connect a recovery maching with an empty recovery tank to the gauge set.

6.Set the recovery machine for liquid recovery and start the recovery machine. Open the gauge set valves to allow the recovery machine to pull a vacuum on the existing system line set and indoor coil.

7.Invert the cylinder of clean R-22 and open its valve to allow liquid refrigerant to flow in to the system through the suction line valve. Allow the refrigerant to pass from the cylinder and through the line set and the indoor coil before it enters the recovery machine.

8.After all of the liquid refrigerant has been recovered, switch the recovery machine to vapor recovery so that all of the R-

22vapor is recovered. Allow the recovery machine to pull a vacuum on the sytem.

NOTE: A single system flush should remove all of the mineral oil from the existing refrigerant lines and indoor coil. A second flushing may be done (using clean refrigerant) if insufficient amounts of mineral oil were removed during the first flush.

After each system flush, allow the recovery machine to pull a vacuum on the system at the end of the procedure.

9.Close the valve on the inverted R-22 cylinder and the gauge set valves. Pump the remaining refrigerant out of the recovery machine and turn the machine off.

10.Use nitrogen to break the vacuum on the refrigerant lines and indoor coil before removing the recovery machine, gauges, and R-22 refrigerant drum. Re-install pressure tap valve cores into the 4AC18LT unit’s service valves.

11.Install the fixed orifice (or thermal expansion valve approved for use with R410A refrigerant) in the liquid line at the indoor coil.

Refrigerant Metering Device

4AC18LT units are designed for use with TXV systems. Refer to the appropriate following section for information on installing the chosen refrigerant metering device.

An R410A system will not operate properly with an R-22 metering device.

Install the refrigerant metering device as shown in Figure

10.Do not twist cap tubes when loosening the seal nut from the orifice housing. Use wrench to back up the distributor.

Figure 10

Expansion Valve Systems

Expansion valves equipped with Chatleff-type fittings are available from the manufacturer. See Table 4 for proper TXV for each unit.

TXV Data

MODEL

PART NUMBER

 

 

4AC18LT- 24, -36 H4TXV01

4AC18LT - 48, -60H4TXV03

Table 4

To install an expansion valve (See Figure 10 above):

1.Separate the distributor assembly and remove the piston orifice and used teflon seal. Insert nozzle end of the expansion valve along with a new teflon seal into the distributor and tighten to 20 - 30 ft. lbs. Use backup wrench on all wrench flats. Overtightening will crush the teflon seal and may cause a leak.

2.Attach liquid line portion of distributor assembly along with new teflon seal to the inlet of the expansion valve. Tighten to 20 - 30 ft. lbs. Use backup wrench on all wrench flats. Overtightening will crush the teflon seal and may cause a leak.

506469-01

Issue 1008

Page 9 of 24

Page 8 Page 10
Image 9
Page 8 Page 10
Contents Lennox International Inc. Company 4AC18LT SeriesInstallation Clearances InstallationTorque Table GeneralSlab Mounting Electrical WiringSlab Mounting Roof MountingOutside Unit Placement & Installation PlacementLine Set Isolation Refrigerant Line Set DiametersInstalling Refrigerant Line Thermostat DesignationsRefrigerant Piping Refrigerant Line Sets Installing Horizontal Runs Refrigerant Line Sets Transition from Vertical to Horizontal Required Euipment Flushing ProcedureRefrigerant Metering Device Expansion Valve SystemsTXV Data To Close Liquid or Suction Line Service Valve To Access the Schrader PortEvacuation Using an Electronic Leak DetectorIssue Refrigerant Charge Adjustment START-UPRefrigerant Charging Blocking Outdoor Coil Check Charge Using Normal Operating Pressures R410A Temperature/Pressure ChartSubcooling Values Approach Values for TXV SystemsIssue Operation Flash Codes Flash Codes Miswired Module Troubleshooting Maintenance Indoor CoilIndoor Unit Start-Up and Performance Checklist Wire Diagram Issue

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.
Top Page Image Contents