Installing Indoor Metering Device

This outdoor unit is designed for use in systems that use

 

See the Lennox XC14 Engineering Handbook for

either fixed orifice or expansion valve metering devices at

 

approved expansion valve kit match−ups. The expansion

the indoor coil.

 

 

 

valve unit can be installed internal or external to the indoor

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

 

coil. In applications where an uncased

coil

is

being

 

installed in a field−provided plenum, install the expansion

provided with the outdoor unit. The metering device is

 

 

valve in a manner that will provide access for field servicing

located in the installation instruction bag. For installing the

 

 

of the expansion valve. Refer to below

illustration for

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

 

 

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 11. Installing Indoor Expansion Valve

Page 16

506636−01

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Image 16
Lenox XC14, Elite Series Installing Indoor Metering Device, Indoor Expansion Valve Installation, Uncased Coil Shown
Page 15 Page 17

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