Carrier 25HCR Outdoor Unit Connected to Factory-Approved Indoor Unit, Accessory Usage

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 80 ft., substantial capacity and performance losses can occur. Following the recommendations in the Application Guideline and Service Manual-Residential Split-System Air Conditioners and Heat Pumps will reduce these losses. Refer to Table 1 for accessory requirements. Refer to Table 2 for field tubing diameters.

There are no buried-line applications greater than 36 in.

If refrigerant tubes or indoor coil are exposed to atmosphere, they 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 refrigerant charge for operation with approved ARI rated indoor unit when connected by 15 ft. of field-supplied or factory-accessory tubing, and factory supplied filter drier. Check refrigerant charge for maximum efficiency.

Refrigerant Tubing and Sweat Connections

Connect vapor tube to fitting on outdoor unit vapor service valves (see Table 2). Connect liquid tubing to adapter tube on liquid service valve. Use refrigerant grade tubing.

!CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage or improper operation.

Service valves must be wrapped in a heat-sinking material such as a wet cloth while brazing.

Remove plastic retainer holding outdoor piston in liquid service valve, leaving the piston and piston retainer inside the valve. Connect sweat/flare adapter provided, to valve. (See Fig. 6.) Connect refrigerant tubing to fittings on outdoor unit vapor and liquid service valves. 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. Do not use soft solder (materials which melt below 800°F). Consult local code requirements. 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

SWEAT/FLARE ADAPTER

A05226

Fig. 6 ---Liquid Service Valve

25HCR

	Table 1—Accessory Usage
	REQUIRED FOR LOW---AMBIENT AP-	REQUIRED FOR LONG LINE APPLICA-
Accessory	PLICATIONS
		TIONS* (Over 80 ft.)
	(Below 55 °F)
Crankcase Heater	Yes	Yes
Evaporator Freeze Thermostat	Yes	No
Winter Start Control	Yes	No
Accumulator	No	No
Compressor Start Assist Capacitor and Relay	Yes	Yes
Support Feet	Recommended	No
Liquid Line Solenoid Valve	No	See Long--- Line Application Guideline

*For Tubing Set lengths between 80 and 200 ft. horizontal or 20 ft. vertical differential (250 ft. Total Equivalent Length), refer to the Long Line Guidelines for Air Conditioners and Heat Pumps using R---22.

Table 2—Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters (in.)

UNIT SIZE	LIQUID		VAPOR (up to 80 ft.*)
	Connection Diameter	Tube	Connection Diameter	Rated Tube Diameter
		Diameter
018, 024	3/8	3/8	5/8	5/8
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 total equivalent lengths up to 80 ft..

2.Do not apply capillary tube or fixed orifice indoor coils to these units.

*For Tubing Set lengths between 80 and 200 ft. horizontal or 20 ft. vertical differential (250 ft.Total Equivalent Length), refer to the Longline Guideline --- Air Conditioners and Heat Pumps using R---22

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