Carrier 38YCX instruction manual Installation Recommendations, Liquid Vapor Unit Size

Table 1—Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters

		LIQUID						VAPOR
UNIT SIZE	Connection Dia.			Tube Dia.		Connection DIia.			Vapor Dia.
	In.	mm	In.		mm	In.	mm		In.	mm
024	3/8	9.53	3/8		9.53	5/8	15.88		5/8	15.88
036	3/8	9.53	3/8		9.53	3/4	19.05		3/4	19.05
048	3/8	9.53	3/8		9.53	7/8	22.23		7/8	22.23
060	3/8	9.53	3/8		9.53	7/8	22.23		1-1/8	28.58

NOTES: 1. Tube diameters are for lengths up to 50 ft (15.24m). For tubing lengths greater than 50 ft (15.24m), consult Long-Line Application Guideline. 2. Do not apply capillary tube indoor coils to these units.

To prevent compressor damage DO NOT bury more than 36 in. of refrigerant tubing. If ANY tubing is buried, provide 6 in. vertical rise at service valve.

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 correct size and condition. For tubing requirements beyond 50 ft (15.24m), consult Long-Line Application Guideline which is available from your local distributor.

NOTE: In some cases noise in the living area has been traced to gas pulsations from improper installation of equipment.

INSTALLATION RECOMMENDATIONS

1.Locate unit away from windows.

2.Ensure that vapor and liquid tube diameters are appropriate to capacity of unit. (See Table 1.)

3.Run refrigerant tubes as directly as possible by avoiding unnecessary turns and bends.

4.Leave some slack between structure and unit to absorb vibration.

5.When passing refrigerant tubes through the wall, seal opening with RTV or other pliable silicon-based caulk. (See Fig. 4.)

6.Avoid direct tubing contact with water pipes, ductwork, floor joists, wall studs, floors, and walls.

7.Do not suspend refrigerant tubing from joists and studs with a rigid wire or strap which comes in direct contact with tubing. (See Fig. 4.)

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

9.When necessary, use hangar straps which are 1 in. (25mm) wide and conform to shape of tubing insulation. (See Fig. 4.)

10.Isolate hangar straps from insulation by using metal sleeves bent to conform to shape of insulation.

If refrigerant tubes or indoor coil is exposed to atmosphere, it must be evacuated to 500 microns to eliminate contamination and moisture in the system.

OUTDOOR UNIT CONNECTED TO FACTORY-APPROVED INDOOR UNIT — Outdoor unit contains correct system refriger- ant charge for operation with indoor unit of same size when connected by 15 ft (4.55m) of field-supplied or factory-accessory tubing. Check refrigerant charge for maximum efficiency.

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

TUBE ONLY)INSULATION VAPOR TUBE

1″ MIN
(25 mm)		LIQUID TUBE
	SUSPENSION

A94330

Fig. 4—Piping Installation

PISTON BODY

PISTON

PISTON RETAINER

SWEAT/FLARE ADAPTER

A94029

Fig. 5—Service Valve with Sweat Adapter Tube

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