Carrier 38TRA instruction manual ÐPiping Installation, ÐSolenoid Valve Installation

NOTE:

AVOID CONTACT BETWEEN TUBING AND STRUCTURE

INDOOR WALL

OUTDOOR WALL

CAULK

INSULATION

THROUGH THE WALL	VAPOR LINE
	LIQUID LINE

INSTALL SOLENOID VALVE IN LIQUID TUBE

Solenoid valve must be energized during evacuation for effective evacuation.

Before making liquid tube connections, install factory-supplied solenoid valve on indoor liquid fitting. (See Fig. 4.) Be sure to use flare adapter supplied with the indoor coil when making connec- tions.

If a field-supplied control power source is needed when adding solenoid, wiring must comply with local codes and NEC requirements.

HANGER STRAP (AROUND VAPOR LINE ONLY)

INSULATION

SUSPENSION

JOIST

VAPOR LINE

1″	LIQUID
MIN
	LINE
	A92469

1.Remove coil liquid connection cap and discard.

2.Mount solenoid valve on liquid tube, making sure valve flow arrow points toward indoor coil. Mount valve in any position except valve body at top and electric coil at bottom. (See Fig. 4.) The solenoid valve is to be installed a maximum of 24 in. from indoor coil.

3.Braze valve onto end of liquid tube using silver bearing or non-silver bearing brazing material. Consult local code re- quirements.

4.Braze flare adapter onto outlet end of the solenoid valve.

5.Wire solenoid coil into system control circuit as shown in Fig. 6.

Table 1ÐRefrigerant Connections and Recom- mended Liquid and Vapor Tube Diameters (In.)

UNIT	LIQUID		VAPOR
	Connect	Tube	Connect	Tube
SIZE
	Diameter	Diameter	Diameter	Diameter
018, 024	3/8	3/8	5/8	5/8

Fig. 3ÐPiping Installation

ELECTRICAL JUNCTION

ELECTRICAL COIL

VALVE

FLOW ARROW

STRAIGHT 3/8 IN. STUD

NOTE: System flow direction must match arrow on bottom of body.

Fig. 4ÐSolenoid Valve Installation

A87044

connected by 15 ft of field-supplied or factory-accessory tubing. Check refrigerant charge for maximum efficiency. (See Step 8ÐChecking Charge.)

030, 036	3/8	3/8	3/4	3/4
042, 048	3/8	3/8	7/8	7/8
060	3/8	3/8	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 Application Guideline.

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

REFRIGERANT TUBING Ð Connect tubing to fittings on out- door unit vapor and liquid service valves. (See Fig. 2.)

A brazing shield MUST be used when tubing sets are being brazed to the service valves to prevent damage to the painted unit surface.

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.

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

SWEAT CONNECTION Ð Use refrigerant grade tubing. Service valves are closed from factory and ready for brazing. After wrapping the service valve with a wet cloth, the tubing set can be brazed to the service valve using either silver bearing or non-silver

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