Allied Air Enterprises 4HP16LT manual Refrigerant Metering Device, Manifold Gauge Set

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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 R22 cylinder and the gauge set valves. Pump the remaining refrigeraant 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 R22 refrigerant drum. Re-install pressure tap valve cores into the 4HP16LT unit’s service valves.

11.Install a thermal expansion valve approved for use with R410a refrigerant in the liquid line at the indoor coil.

Refrigerant Metering Device

4HP16LT units are designed for use with TXV systems only. An R410a system will not operate properly with an R22 metering device.

Expansion valves equipped with Chatleff-type fittings are available from the manufacturer. See Table 3 for proper TXV for each unit.

TXV Data

MODEL

PART NUMBER

 

 

4HP16LT- 24H4TXV01

4HP16LT - 36H4TXV02

4HP16LT - 48, -60 H4TXV03

Table 3

To install an expansion valve (See Figure 9):

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.

3.Connect the external equalizer line to the equalizer port on the suction line and tighten to 8 ft.lbs.

Figure 9

4. Strap the superheat sensing bulb to the suction header.

If installing an expansion valve on an indoor coil that previously used a fixed orifice, be sure to remove the existing fixed orifice. Failure to remove a fixed orifice when installing an expansion valve to the indoor coil will result in improper operation and damage to the system.

Manifold Gauge Set

Manifold guage sets used with systems charged with R410A refrigerant must be capable of handling the higher system operating pressures. The gauges should be rated for use with pressures 1 - 800 on the high side and a low side of 30” vacuum to 250 psi with dampened speed to 500 psi. Gauge hoses must be rated for use at up to 800 psi of pressure with a 4000 psi burst rating.

Liquid and Suction Line Service Valves

The liquid line and suction line service valves (See Figure

11)and service ports are used for leak teating, evacuation, charging, and checking charge.

Each valve is equipped with a service port which has a factory-installed Schrader valve. A service port cap protects the Schrader valve from contamination and serves as the primary leak seal.

To Access the Schrader Port:

1.Remove the service port cap with an adjustable wrench.

2.Connect gauge to the service port.

3.When testing is completed, replace service port cap. Tighten finger tight, then an additional 1/6 turn.

506468-01

Issue 1004

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Contents 4HP16LT Series Torque Table Installation ClearancesGeneral Fastener TorqueSlab Mounting Electrical WiringSlab Mounting Roof MountingThermostat Designations Without Auxiliary HeatWith Auxiliary Heat Outside Unit Placement Installation Installing Refrigerant LineBrazing Connection Procedure Refrigerant Line Sets Transition from Vertical to Horizontal Refrigerant Line Sets Installing Horizontal RunsR22 refrigerant will be used to flush the system Flushing Existing Line Set and Indoor CoilFlushing Connections Liquid and Suction Line Service Valves Refrigerant Metering DeviceManifold Gauge Set Ball Type Service Valve Valve Open Service ValveTo Open Liquid or Suction Line Service Valve To Close Liquid or Suction Line Service ValveEvacuation Refrigerant Charge Adjustment Ambient temperatureRefrigerant Charging Cooling Cycle Charge Using Weigh-In MethodBlocking Outdoor Coil R410A Temperature/Pressure ChartNormal Operating Pressures Approach Values for TXV Systems Check Charge Using Normal Operating PressuresFilter Drier OperationSensor Temp. / Resistance Range Defrost Board Pressure Switch ConnectionsDelay Mode Issue Defrost Control Board Diagnostic LEDs Interpreting the Diagnostic LEDs System Diagnostic ModuleFlash Codes LED DescriptionShort Cycling 24VAC Power WiringMiswired Module Troubleshooting Thermostat Demand WiringMiswired Module Codes Maintenance Case of extended power outage Heat Pump OperationThermostat Operation Preservice Check Cooling Start-Up and Performance ChecklistHeating Sequence of OperationSingle Stage Wire Diagram Two Stage Wire Diagram