Lennox International Inc 506510-01 Flushing the System, Uncased Coil Shown

Flushing the System

FLUSHING			TYPICAL CHECK EXPANSION VALVE
					(Uncased Coil Shown)
					REMOVAL PROCEDURE
LINE SET AND INDOOR COIL (1 OF 2)					STUB END
		TWO PIECE PATCH PLATE		LIQUID LINE			CHECK
			(UNCASED COIL ONLY)
					ORIFICE		EXPANSION
TYPICAL FIXED ORIFICE REMOVAL PROCEDURE
			DISTRIBUTOR		HOUSING		VALVE
1(Uncased Coil Shown)
			TUBES				TEFLON
DISTRIBUTOR TUBES								RING
LIQUID LINE ORIFICE HOUSING
						TEFLON
TEFLON RING						RING		SENSING
FIXED ORIFICE								LINE
	BRASS NUT		OR
			DISTRIBUTOR		EQUALIZER
			ASSEMBLY
					LINE
DISTRIBUTOR							LIQUID LINE
ASSEMBLY
							ASSEMBLY WITH
REMOVE AND DISCARD
							BRASS NUT
WHITE TEFLON SEAL (IF
PRESENT)	LIQUID LINE ASSEMBLY
	(INCLUDES STRAINER)		MALE EQUALIZER
A On fully cased coils, remove the coil access and plumbing panels.			LINE FITTING			VAPOR
								LIQUID
B Remove any shipping clamps holding the liquid line and distributor			SENSING BULB			LINE
								LINE
assembly.			A On fully cased coils, remove the coil access and plumbing panels.
C Using two wrenches, disconnect liquid line from liquid line orifice
			B Remove any shipping clamps holding the liquid line and distributor as-
housing. Take care not to twist or damage distributor tubes during
			sembly.
this process.
D Remove and discard fixed orifice, valve stem assembly if present			C Disconnect the equalizer line from the check expansion valve equaliz-
			er line fitting on the vapor line.
and Teflon washer as illustrated above.
E Use a field−provided fitting to temporary reconnect the liquid line to			D Remove the vapor line sensing bulb.
the indoor unit’s liquid line orifice housing.			E Disconnect the liquid line from the check expansion valve at the liquid
			line assembly.

2CONNECT GAUGES AND EQUIPMENT FOR FLUSHING PROCEDURE

		INVERTED HCFC−22	GAUGE
		CYLINDER CONTAINS	MANIFOLD
		CLEAN HCFC−22 TO BE
	A	USED FOR FLUSHING.
		1	LOW	HIGH
VAPOR LINE		NEW
SERVICE VALVE		OUTDOOR
		UNIT
		OPENED		CLOSED
EXISTING
INDOOR unit		B
LIQUID LINE SERVICE
VALVE
RECOVERY
CYLINDER			TANK
			RETURN
	VAPOR LIQUID	C	DISCHARGE
D			INLET
		RECOVERY MACHINE

AInverted HCFC−22 cylinder with clean 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 to the gauge set.

D Connect recovery tank to recovery machines per machine instructions.

FDisconnect the check expansion valve from the liquid line orifice hous- ing. Take care not to twist or damage distributor tubes during this pro- cess.

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

HUse a field−provided fitting to temporary reconnect the liquid line to the indoor unit’s liquid line orifice housing.

CAUTION

tems which contain contaminants (Example compressor burn out.

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 sys-

tem. Check the charge in the flushing cylinder before proceeding.

B

ASet the recovery machine for liquid recovery and start the recov- ery machine. Open the gauge set valves to allow the recovery machine to pull a vacuum on the existing system line set and in- door unit coil.

BInvert the cylinder of clean HCFC−22 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.

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 down to 0 the system.

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.

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506510−01