Lenox 506637-01 Installing Indoor Metering Device, Indoor Expansion Valve Installation

Installing Indoor Metering Device

This outdoor unit is designed for use in systems that use				coil. In applications where an uncased coil is being
expansion valve metering devices at the indoor coil.				installed in a field−provided plenum, install the expansion
See the Lennox XC16 Engineering Handbook for				valve in a manner that will provide access for field servicing
approved expansion valve kit match−ups. The expansion				of the expansion valve. Refer to below illustration for
valve unit can be installed internal or external to the indoor				reference during installation of expansion valve unit.
INDOOR EXPANSION VALVE INSTALLATION			A	Remove the field−provided fitting that temporary	1/2 Turn
TWO PIECE				reconnected the liquid line to the indoor unit’s distributor
	(Uncased Coil Shown)			assembly.			12
PATCH PLATE					1011			1 2
(UNCASED			B	Install one of the provided Teflon® rings around the
COIL ONLY)	LIQUID LINE	STUB		stubbed end of the expansion valve and lightly lubricate	9			3
		END EXPANSION
	ORIFICE
		VALVE		the connector threads and expose surface of the Teflon®	8			4
	HOUSING
DISTRIBUTOR				ring with refrigerant oil.		7 6		5
TUBES
		TEFLON®	C Attach the stubbed end of the expansion valve to the
		RING		liquid line orifice housing. Finger tighten and use an
				appropriately sized wrench to turn an additional 1/2 turn
				clockwise as illustrated in the figure above, or 20 ft−lb.

TEFLON® RING

SENSING

LINE

DPlace the remaining Teflon® washer around the other end of the expansion valve. Lightly lubricate connector threads and expose surface of the Teflon® ring with refrigerant oil.

DISTRIBUTOREQUALIZER

ASSEMBLY LINE

LIQUID LINE

ASSEMBLY WITH

BRASS NUT

EAttach the liquid line assembly to the expansion valve. Finger tighten and use an appropriately sized wrench to turn an additional 1/2 turn clockwise as illustrated in the figure above or 20 ft−lb.

SENSING BULB INSTALLATION

MALE EQUALIZER LINE	VAPOR
FITTING (SEE
	LINE
EQUALIZER LINE
INSTALLATION FOR
FURTHER DETAILS)

Sensing bulb insulation is required if mounted external to the coil casing. sensing bulb installation for bulb positioning.

AAttach the vapor line sensing bulb in the proper orientation as illustrated to the right using the clamp and screws provided.

NOTE

and expansion bulb before insulating the sensing bulb once LIQUID LINE installed.

BConnect the equalizer line from the expansion valve to the equalizer vapor port on the vapor line. Finger tighten the flare nut plus 1/8 turn (7 ft−lbs) as illustrated below.

	1/8 Turn
	11 12		1
10			2
9			43
8	7	6	5

EQUALIZER LINE INSTALLATION

ARemove and discard either the flare seal cap or flare nut with copper flare seal bonnet from the equalizer line port on the vapor line as illustrated in the figure to the right.

BRemove and discard either the flare seal cap or flare nut with copper flare seal bonnet from the equalizer line port on the vapor line as illustrated in the figure to the right.

VAPOR LINE	ON LINES SMALLER THAN
	7/8", MOUNT SENSING
	BULB AT EITHER THE 3 OR
	9 O’CLOCK POSITION.
	12
BULB	BULB

FLARE SEAL CAP

OR

FLARE NUT	VAPOR LINE
		ON 7/8" AND LARGER LINES,
		MOUNT SENSING BULB AT
COPPER FLARE		EITHER THE 4 OR 8 O’CLOCK
SEAL BONNET	12	POSITION. NEVER MOUNT ON
		BOTTOM OF LINE.
MALE BRASS EQUALIZER	BULB	BULB
LINE FITTING

VAPOR LINE NOTE OM OF LINE.

Figure 10. Installing Indoor Expansion Valve

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