Carrier 38TXA ÐAccurater Components, ÐPiping Installation, ÐInstall AccuRater Piston and Ring

PISTON

RETAINER

PISTON

RING

PISTON

PISTON

BODY

FIELD

CONNECTION

STRAINER

FLARE

ADAPTOR

LIQUID LINE STRAINER

APPROX. 2” LONG

STRAINER LABEL (AFFIX TO LIQ. LINE

NEAR STRAINER LOCATION)

A95615

Fig. 2ÐAccurater Components

existing R-22 TXV must be replaced with a factory-approved TXV specifically designed for R-410A. To replace an R-22 TXV see accessory kit instructions.

NOTE: FK4 fan coils are equipped with an R-22 TXV. If an FK4 fan coil is used with an R-410A air conditioner, the R-22 TXV must be replaced.

Step 4ÐInstall AccuRater® Piston and Ring

ACCURATER PISTON

1.If unit is to be installed with a piston metering device, check indoor piston to see if it matches required piston on outdoor unit rating plate. If it does not match, replace with piston shipped with outdoor unit. The piston shipped with outdoor unit is correct for any approved indoor coil combination.

2.After correct piston is installed, locate brass piston ring shipped in piston bag. Install piston ring behind metering piston as shown in Fig. 2. The piston ring will ensure piston stays seated during all operating conditions.

Step 5ÐMake Piping Connections

Do not leave system open to atmosphere any longer than minimum required for installation. POE oil in compressor is extremely susceptible to moisture absorption. Always keep ends of tubing sealed during installation.

Outdoor units may be connected to indoor sections using accessory tubing package or field-supplied refrigerant grade tubing of correct size and condition. For tubing requirements beyond 50 ft, consult Application Guideline and Service Manual for air conditioners with R-410A.

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 wall, seal opening with RTV or other pliable silicon-based caulk. (See Fig. 3.)

6.Avoid direct lineset 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. 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

1″ MIN.

LIQUID TUBE

SUSPENSION

A94028

Fig. 3ÐPiping Installation

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

9.When necessary, use hanger straps which are 1 in. wide and conform to shape of tubing insulation. (See Fig. 3.)

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

DO NOT BURY MORE THAN 36 IN. OF REFRIGERANT TUBING IN GROUND. If any section of tubing is buried, there must be a 6-in. vertical rise to the valve connections on the outdoor unit. If more than the recommended length is buried, refrigerant may migrate to cooler buried section during extended periods of unit shutdown, causing refrigerant slugging and possible compressor damage at start-up.

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