Lennox International Inc Merit Series Air Conditioner, 506945-01 installation instructions

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			HOUSING
			DISTRIBUTOR		VALVE
	TEFLON® RING		TUBES			TEFLON®
						RING
	FIXED ORIFICE
	BRASS NUT				TEFLON®
						SENSING
					RING
						LINE

DISTRIBUTOR ASSEMBLY

REMOVE AND DISCARD

WHITE TEFLON® SEAL

(IF PRESENT) LIQUID LINE ASSEMBLY (INCLUDES STRAINER)

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

BRemove any shipping clamps from the liquid line and distributor as­ sembly.

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

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

EUse 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

DISTRIBUTOR EQUALIZER

ASSEMBLY LINE

LIQUID LINE

ASSEMBLY WITH

BRASS NUT

MALE EQUALIZER
LINE FITTING	VAPOR
		LIQUID
SENSING BULB	LINE
		LINE

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

BRemove any shipping clamps from the liquid line and distributor assembly.

CDisconnect the equalizer line from the expansion valve equalizer line fitting on the vapor line.

DRemove the vapor line sensing bulb.

EDisconnect the liquid line from the expansion valve at the liquid line assembly.

A

VAPOR LINE SERVICE VALVE

CYLINDER CONTAINING		GAUGE
CLEAN HCFC-22 TO BE		MANIFOLD
USED FOR FLUSHING
(Positioned to deliver liquid
refrigerant)
1	LOW	HIGH

NEW

OUTDOOR

UNIT

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

GRemove and discard expansion valve and the two Teflon® rings.

HUse a field-provided fitting to temporarily reconnect the liquid line to the indoor unit's liquid line orifice housing.

3FLUSHING LINE SET

OPENED CLOSED

EXISTING

INDOOR

UNITB

LIQUID LINE SERVICE

VALVE

RECOVERY
CYLINDER	TANK
	RETURN

	VAPOR LIQUID	C	DISCHARGE
D			INLET
			RECOVERY MACHINE

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.

ASet 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.

BPosition 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.

AHCFC-22 cylinder with clean refrigerant (positioned to deliver liquid refrigerant) to the vapor service valve.

BHCFC-22 gauge set (low side) to the liquid line valve.

CHCFC-22 gauge set center port to inlet on the recovery machine with an empty recovery tank connected to the gauge set.

DConnect recovery tank to recovery machine per machine instructions.

CAfter 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.

DClose 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 7

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