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506636−01

Installing Indoor Metering Device

This outdoor unit is designed for use in systems that use

either fixed orifice or expansion valve metering devices at

the indoor coil.

If using a fixed orifice metering device, use the the one

provided with the outdoor unit. The metering device is

located in the installation instruction bag. For installing the

orifice, reverse the procedure outlined in figure 10, 1A.

See the Lennox XC14 Engineering Handbook for

approved expansion valve kit match−ups. The expansion

valve unit can be installed internal or external to the indoor

coil. In applications where an uncased coil is being

installed in a field−provided plenum, install the expansion

valve in a manner that will provide access for field servicing

of the expansion valve. Refer to below illustration for

reference during installation of expansion valve unit.

A Attach the vapor line sensing bulb in the proper

orientation as illustrated to the right using the clamp and

screws provided.

NOTE  Confirm proper thermal contact between vapor line

and expansion bulb before insulating the sensing bulb once

installed.

B Connect 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.

TWO PIECE

PATCH PLATE

(UNCASED

COIL ONLY)

VAPOR

LINE

LIQUID LINE

ORIFICE

HOUSING

DISTRIBUTOR

TUBES

LIQUID LINE

MALE EQUALIZER LINE

FITTING (SEE

EQUALIZER LINE

INSTALLATION FOR

FURTHER DETAILS)

SENSING

LINE

EQUALIZER

LINE

EXPANSION

VALVE

TEFLON

RING

(Uncased Coil Shown)

Sensing bulb insulation is required if

mounted external to the coil casing. sensing

bulb installation for bulb positioning.

STUB

END

TEFLON

RING

LIQUID LINE

ASSEMBLY WITH

BRASS NUT

DISTRIBUTOR

ASSEMBLY

A Remove the field−provided fitting that temporary

reconnected the liquid line to the indoor unit’s distributor

assembly.

B Install one of the provided Teflon

rings around the

stubbed end of the expansion valve and lightly lubricate

the connector threads and expose surface of the Teflon

ring with refrigerant oil.

C Attach the stubbed end of the expansion valve to the

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.

D Place 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.

E Attach 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.

ON 7/8" AND LARGER LINES,

MOUNT SENSING BULB AT

EITHER THE 4 OR 8 O’CLOCK

POSITION. NEVER MOUNT ON

BOTTOM OF LINE.

ON LINES SMALLER THAN

7/8", MOUNT SENSING

BULB AT EITHER THE 3 OR

9 O’CLOCK POSITION.

BULB

VAPOR LINE

NOTE  NEVER MOUNT ON BOTTOM OF LINE.

BULB

VAPOR LINE

FLARE NUT

COPPER FLARE

SEAL BONNET

MALE BRASS EQUALIZER

LINE FITTING

FLARE SEAL CAP

1/2 Turn

SENSING BULB INSTALLATION

EQUALIZER LINE INSTALLATION

1/8 Turn

A Remove 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.

B Remove 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.

INDOOR EXPANSION VALVE INSTALLATION

Figure 11. Installing Indoor Expansion Valve

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 29 30

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