Lennox International Inc Dave Lennox Signature Collection XC21 System Uncased Coil only, Sensing

STEP 2 −− REFRIGERANT PIPING −− Removing Existing Indoor Metering Device

	TYPICAL EXISTING FIXED ORIFICE		TYPICAL EXISTING EXPANSION VALVE REMOVAL
1A	REMOVAL PROCEDURE	OR	1BPROCEDURE (UNCASED COIL SHOWN)
	(UNCASED COIL SHOWN)
				STUB END
	DISTRIBUTOR TUBES		TWO−PIECE PATCH PLATE	LIQUID LINE
			(UNCASED COIL ONLY)
				ORIFICE	EXPANSION
	LIQUID LINE ORIFICE HOUSING		DISTRIBUTOR	HOUSING	VALVE
	TEFLON® RING		TUBES		TEFLON®
					RING
	FIXED ORIFICE
	BRASS NUT			TEFLON®
				RING	SENSING
					LINE

DISTRIBUTOR ASSEMBLY

REMOVE AND DISCARD

WHITE TEFLON® SEAL

(IF PRESENT) LIQUID LINE ASSEMBLY (INCLUDES STRAINER)

1.On fully cased coils, remove the coil access and plumbing panels.

2.Remove any shipping clamps from the liquid line and distributor as- sembly.

3.Using two wrenches, disconnect liquid line from liquid line orifice hous- ing. Take care not to twist or damage distributor tubes during this pro- cess.

4.Remove and discard fixed orifice, valve stem assembly (if present) and Teflon® washer as illustrated above.

5.Use a field−provided fitting to temporarily reconnect the liquid line to the indoor unit’s liquid line orifice housing.

2CONNECT GAUGES AND EQUIPMENT FOR FLUSHING PROCEDURE

CYLINDER CONTAINING	GAUGE
CLEAN HCFC−22 TO BE	MANIFOLD
USED FOR FLUSHING

A(Positionedrefrigerant) to deliver liquid

1 LOW HIGH

VAPOR LINE	NEW
SERVICE VALVE	OUTDOOR
	UNIT

OPENED CLOSED

EXISTING

INDOOR

UNITB

LIQUID LINE SERVICE

VALVE

RECOVERY
CYLINDER	TANK
	RETURN

	VAPOR LIQUID	C	DISCHARGE
D			INLET
			RECOVERY MACHINE

1. HCFC−22 cylinder with clean refrigerant (positioned to deliver liquid refrigerant) to the vapor service valve.

2. HCFC−22 gauge set (low side) to the liquid line valve.

3. HCFC−22 gauge set center port to inlet on the recovery machine with an empty recovery tank connected to the gauge set.

4. Connect recovery tank to recovery machine per machine instructions.

DISTRIBUTOR EQUALIZER

ASSEMBLY LINE

LIQUID LINE

ASSEMBLY WITH

BRASS NUT

MALE EQUALIZER
LINE FITTING	VAPOR
		LIQUID
SENSING BULB	LINE
		LINE

1.On fully cased coils, remove the coil access and plumbing panels.

2.Remove any shipping clamps from the liquid line and distributor assembly.

3.Disconnect the equalizer line from the check expansion valve equalizer line fitting on the vapor line.

4.Remove the vapor line sensing bulb.

5.Disconnect the liquid line from the check expansion valve at the liquid line assembly.

6.Disconnect the check expansion valve from the liquid line orifice housing. Take care not to twist or damage distributor tubes during this process.

7.Remove and discard check expansion valve and the two Teflon® rings.

8.Use a field−provided fitting to temporarily reconnect the liquid line to the indoor unit’s liquid line orifice housing.

3FLUSHING LINE SET

The line set and indoor unit coil must be flushed with at least the same amount of clean refrigerant that previously charged the system. Check the charge in the flushing cylinder before proceeding.

1.Set the recovery machine for liquid recovery and start the recovery machine. Open the gauge set valves to allow the recovery machine to pull a vacuum on the existing system line set and indoor unit coil.

2.Position the cylinder of clean HCFC−22 for delivery of liquid refrigerant and open its valve to allow liquid refrigerant to flow into the system through the vapor line valve. Allow the refrigerant to pass from the cylinder and through the line set and the indoor unit coil before it enters the recovery machine.

3.After all of the liquid refrigerant has been recovered, switch the recovery machine to vapor recovery so that all of the HCFC−22 vapor is recovered. Allow the recovery machine to pull the system down to 0.

4.Close the valve on the inverted HCFC−22 drum and the gauge set valves. Pump the remaining refrigerant out of the recovery machine and turn the machine off.

FIGURE 6

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XC21 SERIES