Carrier 38YRA instruction manual ÐAccessory Support Feet, → ÐPiping Installation

7.Do not suspend refrigerant tubing from joists and studs with a rigid wire or strap which comes in direct contact with the tubing. (See Fig. 3.)

NOTE: Avoid contact between tubing and structure

OUTDOOR WALL INDOOR WALL

CAULK

LIQUID TUBE

VAPOR TUBE

INSULATION

THROUGH THE WALL

	JOIST
HANGER STRAP
(AROUND VAPOR	INSULATION
TUBE ONLY)
	VAPOR TUBE

Fig. 4ÐAccessory Support Feet

COIL

A93567

1″ MIN.

LIQUID TUBE

SUSPENSION

A94028

→ Fig. 3ÐPiping Installation

8. Ensure that tubing insulation is pliable and completely sur-

SENSING

BULB

EQUALIZER

TUBE

THERMOSTATIC EXPANSION VALVE

	rounds the vapor tube.
9.	When necessary, use hanger straps which are 1 in. wide and
	conform to the shape of the tubing insulation. (See Fig. 3.)
10.	Isolate the hanger straps from the insulation by using metal

Fig. 5ÐTypical TXV Installation

10 O'CLOCK

2 O'CLOCK

A88382

sleeves bent to conform to the shape of the insulation.

If refrigerant tubes or indoor coil is exposed to atmospheric conditions for longer than 5 minutes, it must be evacuated to 500 microns to eliminate contamination and moisture in the system.

OUTDOOR UNITS CONNECTED TO FACTORY-APPROVED INDOOR UNITS Ð Outdoor unit contains correct system refrig- erant charge for operation with indoor unit of the same size when connected by 15 ft of field-supplied or factory accessory tubing. Check refrigerant charge for maximum efficiency. (See Step 10ÐChecking Charge.)

REFRIGERANT TUBING Ð Connect refrigerant tubing to fit- tings on outdoor unit vapor and liquid service valves. (See Fig. 2.)

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	3/8	3/8	5/8	5/8
024-030	3/8	3/8	3/4	3/4
036-048	3/8	3/8	7/8	7/8
060	3/8	3/8	7/8	1-1/8

Note: Tube diameters are for lengths up to 50 ft. For tubing lengths greater than 50 ft, consult Long-Line Application Guideline.

SENSING BULB

STRAP

SUCTION TUBE

8 O'CLOCK	4 O'CLOCK
7⁄8 IN. OD & SMALLER	LARGER THAN 7⁄8 IN. OD
	A81032

Fig. 6ÐPositioning of Sensing Bulb

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 bearing brazing material. Remove plastic retainer holding outdoor piston in the liquid service valve and connect sweat adapter provided to valve. (See Fig. 7.) Consult local code requirements. Refrigerant tubing and indoor coil are now ready for leak testing. This check should include all field and factory joints.

3