Carrier 38CKC(Q) instruction manual Mechanical Connection 38CKQ Models, Mechanical Fitting Repair

AIR DISCHARGE

						FIELD POWER
						SUPPLY CONN
						7⁄8″ DIA HOLE WITH
						1 1⁄8″ DIA KNOCKOUT
						AND 1 3⁄8″ DIA
						KNOCKOUT
						FIELD CONTROL
						SUPPLY CONN
SUCTION LINE CONN						7⁄8″ DIA HOLE
		LIQUID LINE CONN
							A97009
UNIT SIZE			LIQUID TUBE			VAPOR TUBE
		Conn Dia			Tube Dia	Conn Dia	Tube Dia
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

NOTE: Tube diameters are for lengths up to 50 ft. For tubing lengths greater than 50 ft, consult your local distributor.

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

Fig. 4ÐRefrigerant Tube Dimensions/Connections

4.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.

5.Refrigerant tubing and indoor coil are now read for leak testing. This check should include all field and factory joints.

MECHANICAL CONNECTION (38CKQ MODELS)

1.Cut tubing to correct length, deburr, and size as necessary, making sure tube ends are square. If a large burr is evident, ID and OD must be deburred to allow tube to bottom in valve.

2.Remove lock nuts and ferrules from plastic bags taped to service panel. (See Fig. 5.)

VALVE FITTING

FERRULE

LOCK NUT

A92120

Fig. 5ÐMechanical Fitting Assembly (38CKQ)

3

If undersized, damaged, or elliptically shaped tubing is used when making connection, leaks could result.

3. Slide lock nut and ferrule onto each tube. (See Fig. 6.)

FERRULE LOCK NUT

TUBING

A92121

Fig. 6ÐLock Nut/Ferrule Positioning (38CKQ)

4.Apply a few drops of refrigerant oil to ferrule and valve threads to reduce assembly torque and assist sealing.

5.Insert tube end into service valve until it bottoms.

6.Push ferrule into place and hand tighten nut until an increase in torque is felt.

7.Mark nut and tube and tighten 1-1/2 turns from mark. (See Fig. 7.) Keep tube bottomed in valve while tightening nut.

NOTE: A backup wrench on the hex part of the suction valve is required while tightening.

The tube end must stay bottomed in the service valve during final assembly to ensure proper seating, sealing, and rigidity.

MECHANICAL FITTING REPAIR

To replace damaged ferrule or tubing proceed as follows.

1.Attach gages to service valves.

2.Close liquid service valve and operate unit to pump refrigerant charge into condenser coil.

3.When suction pressure reaches 5 psig, shut unit off. Do not operate unit in a vacuum.

4.Close suction service valve and recover refrigerant in tubing.

5.Back-off locknut and ferrule onto tube.

6.Remove damaged part of tubing using tubing cutter. Repeat installation procedure previously outlined using new ferrule.

7.Evacuate tubing set and indoor coil. Check for leaks.

8.Open service valves or recharge unit. Check refrigerant charge.

Step 7ÐInstall Solenoid Valve In Liquid Tube (If Re- quired)

Not all applications require use of a liquid tube solenoid valve. If your unit has been shipped with a liquid tube solenoid valve in the unit, it must be installed for performance enhancement. The liquid tube solenoid valve must be ener- gized during evacuation for complete removal of refrigerant.

Before making liquid tube connections, install factory-supplied solenoid valve on indoor liquid fitting. (See Fig. 8.) Be sure to use flare adapter supplied with the indoor coil when making connec- tions.