Carrier R-22 Especificaciones descargar pdf (Pagina 8)

Refrigerant piping diagram

Single circuit only for 38AJ/AZ 008-036 units

Soldered plug with

pressure equalisation

port. To be removed

during installation.

General recommendations for field installation

Thermostatic expansion valve (TXV) and solenoid valve

• The thermal expansion valve sensing bulb must be

installed after at least two 90° bends at the evaporator

outlet.

• Ideally the TXV should be installed in a vertical pipe run.

If that is not possible, the valve may be rotated through a

full 90°, with the horizontal pipe remaining at the base.

• The TXV and solenoid valves are installed as shown in

Figs. 1 to 5 (pages 9 and 10).

- Liquid line solenoid valves are not necessary, if

single-circuit evaporators are used and the evaporator

has sufficient capacity to hold the whole refrigerant

charge. In this case the unit wiring must be modified;

please refer to Carrier Service Bulletin No. SB 005-

76-96 E.

- Solenoid valves are needed with dual-circuit

evaporators to deactivate the upper section of the

evaporator coil and reduce the load on the

compressor (capacity unloaders operated by suction

pressure).

Legend:

1 Condenser

2 Liquid line valve

3 Filter drier

4 Sight glass

5 Fan cycling pressure switch

6 Suction valve

NOTE: The typical refrigeration circuit diagram shown does

not apply to all control types used.

7 Compressor

8 Discharge valve

9 Muffler

A Circuit 1

B Circuit 2

C Option No. 97

Installation of piping

IMPORTANT:

• In order to prevent vibration and possible pipe breaks

install proper pipe supports for all pipes at the point

where they leave the unit.

• On all units, relieve the pressure of the holding charge

before opening the circuit.

• Open all service valves:

- on models 014 to 074, open the compressor suction

and discharge valves

- on all models, open the liquid line shut-off valves.

• Remove the protective cap from the Schrader port in the

liquid line valve and press on the valve depressor to

release the holding charge (nitrogen).

• Unsolder the plugs and prepare the pipes for connection.

• Install the filter-drier and moisture indicator (for 38AZ

units these must be specific for R-407C), as shown in

Figs. 1 to 5. Select the filter-drier for maximum unit

capacity and minimum pressure drop. Install the filter-

drier in the liquid line before the expansion valve and the

moisture indicator just after the shut-off valve in the same

line. These are available as factory-fitted option 97.

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Carrier R-22 Especificaciones Pagina 8

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