Carrier 38YCW Make Piping Connections, Refrigerant Tubing, Sweat Connection, Final Tubing Check

Page 3

Table 1—Refrigerant Connections and Recommended Liquid- and Vapor-Tube Diameters (In.)

UNIT

LIQUID

 

VAPOR

 

VAPOR (LONG LINE)

SIZE

Connection Diameter

 

Tube Diameter

Connection Diameter

 

Tube Diameter

Connection Diameter

Tube Diameter

 

 

 

 

 

 

 

 

 

018, 024

3/8

 

3/8

3/4

 

3/4

3/4

3/4

030, 036

3/8

 

3/8

3/4

 

3/4

3/4

7/8

042, 048

3/8

 

3/8

7/8

 

7/8

7/8

1-1/8

060

3/8

 

3/8

7/8

 

1-1/8

7/8

1-1/8

 

 

 

 

 

 

 

 

 

NOTES:

1.Tube diameters are for lengths up to 50 ft. For tubing lengths greater than 50 ft, consult Long Line section of the Application Guideline.

2.Do not apply capillary-tube indoor coils to these units.

Step 8—Make Piping Connections

Relieve pressure and recover all refrigerant before system repair or final unit disposal to avoid personal injury or death. Use all service ports and open all flow-control devices, including solenoid valves.

If ANY refrigerant tubing is buried, provide a 6 in. vertical rise at service valve. Refrigerant tubing lengths up to 36 in. may be buried without further special consideration. For lengths above 36 in., consult your local distributor.

To prevent damage to unit or service valves observe the following:

•Use a brazing shield.

•Wrap service valves with wet cloth or use a heat-sink material.

Outdoor units may be connected to indoor section using accessory- tubing package or field-supplied refrigerant-grade tubing of cor- rect size and condition. For tubing requirements beyond 50 ft length or 20 ft vertical differential, substantial capacity and performance losses can occur. Following the recommendations in the Residential Split-System Long-Line Application Guideline will reduce these losses. Refer to Table 1 for field-tubing diam- eters.

REFRIGERANT TUBING

Connect tubing to fittings on outdoor unit vapor- and liquid- service valves. (See Table 1.) Use refrigerant-grade tubing. Refer to appropriate section below for type of service valves installed on unit.

SWEAT CONNECTION

To avoid valve damage while brazing, service valves must be wrapped in a heat-sinking material such as a wet cloth.

1.Remove plastic retainer holding outdoor piston in liquid- service valve.

2.Locate adapter tube shipped with unit.

3.Install strainer in adapter tube and connect tube to service valve. (See Fig. 4.)

4.Connect refrigerant tubing to fittings on outdoor-unit vapor- and liquid-service valves.

5.Service valves are closed from factory and ready for brazing. After wrapping service valve with a wet cloth, tubing set can be brazed to service valve using either silver-bearing or

non-silver-bearing brazing material. Consult local code re- quirements.

Refrigerant tubing and indoor coil are now ready for leak testing. This check should include all field and factory joints.

PISTON BODY

PISTON

PISTON

RETAINER

STRAINER

SWEAT/FLARE ADAPTER

A97512

Fig. 4—Liquid-Service Valve with Sweat-Adapter

Tube

FINAL TUBING CHECK

IMPORTANT: Check to be certain factory tubing on both indoor and outdoor unit has not shifted during shipment. Ensure tubes are not rubbing against each other or any sheet metal. Pay close attention to feeder tubes, making sure wire ties on feeder tubes are secure and tight.

Step 9—Make Electrical Connections

To avoid personal injury or death, do not supply power to unit with compressor terminal-box cover removed.

Be sure field wiring complies with local and national fire, safety, and electrical codes, and voltage to system is within limits shown on unit-rating plate. Contact local power company for correction of improper voltage. See unit-rating plate for recommended circuit- protection device.

NOTE: Operation of unit on improper line voltage constitutes abuse and could affect unit reliability. See unit-rating plate. Do not install unit in system where voltage or phase imbalance (3 phase) may fluctuate above or below permissible limits.

NOTE: Use copper wire only between disconnect switch and unit.

3

Image 3
Contents Introduction and Recommendations Safety ConsiderationsInstallation DimensionsFinal Tubing Check Make Piping ConnectionsRefrigerant Tubing Sweat ConnectionCheck Charge Install Electrical AccessoriesCompressor Crankcase Heater Start-UpFinal Checks Phase-Monitor LED IndicatorsCOOLING-ONLY Procedure Example Heating CHECK-CHART ProcedureTypical 24v Circuit Connections Sequence of Operation Care and Maintenance