FLUSHING LINE SET AND INDOOR COIL (2 OF 2)
4TYPICAL CHECK EXPANSION VALVE INSTALLATION PROCEDURE
This outdoor unit is designed for use in systems that use check expansion valve metering device. See the Lennox XC17 Engineering Handbook for approved check expansion valve kit match−ups and application information.
TWO PIECE PATCH PLATE (UNCASED COIL ONLY)
DISTRIBUTOR
TUBES
(Uncased Coil Shown)
LIQUID LINE STUB
ORIFICE END CHECK
HOUSINGEXPANSION VALVE
The check 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 check expansion valve in a manner that will provide access for field servicing of the check expansion valve. Refer to below illustration for reference during installation of check expansion valve unit.
TEFLON
RING
| 11 | 12 | 1 | 1/2 TURN |
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| |
10 |
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| 2 | |
9 |
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| 43 |
8 | 7 | 6 | 5 |
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| A Remove the field−provided fitting that temporary reconnected the liquid | |
TEFLON |
| line to the indoor unit’s distributor assembly. | |
SENSING | B Install one of the provided Teflon rings around the stubbed end of the | ||
RING | |||
| LINE | check expansion valve and lightly lubricate the connector threads and | |
|
| expose surface of the Teflon ring with refrigerant oil. |
DISTRIBUTOREQUALIZER
ASSEMBLY
LINE
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
MALE EQUALIZER LINE | VAPOR | |
FITTING (SEE | ||
LINE | ||
EQUALIZER LINE | ||
| ||
INSTALLATION FOR | LIQUID LINE | |
FURTHER DETAILS) | ||
|
SENSING BULB INSULATION IS REQUIRED
IF MOUNTED EXTERNAL TO THE COIL
CASING. SENSING BULB INSTALLATION
FOR BULB POSITIONING.
CAttach the stubbed end of the check 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.
DPlace the remaining Teflon washer around the other end of the check expansion valve. Lightly lubricate connector threads and expose sur- face of the Teflon ring with refrigerant oil.
EAttach the liquid line assembly to the check 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.
VAPOR LINE | ON LINES SMALLER THAN 7/8", | |
MOUNT SENSING BULB AT | ||
| ||
| EITHER THE 3 OR 9 O’CLOCK | |
| POSITION. | |
| 12 | |
BULB | BULB |
SENSING BULB INSTALLATION
A Attach the vapor line sensing bulb in the proper orientation | VAPOR LINE |
| |
| ON 7/8" AND LARGER LINES, | ||
as illustrated to the right using the clamp and screws pro- |
| ||
| MOUNT SENSING BULB AT | ||
vided. |
| ||
| EITHER THE 4 OR 8 O’CLOCK | ||
NOTE |
| POSITION. NEVER MOUNT ON | |
12 | BOTTOM OF LINE. | ||
and check expansion bulb before insulating the sensing bulb | |||
|
| ||
once installed. | 1/8 TURN |
|
BConnect the equalizer line from the check expansion valve to the equalizer vapor port on the vapor line. Finger tighten the flare nut plus 1/8 turn (7 ft−lbs) as illus- trated below.
11 | 12 | 1 |
10 |
| 2 |
9 |
| 3 |
84
7 6 5
BULB | BULB |
| |
NOTE OM OF LINE. |
|
FLARE SEAL CAP | FLARE NUT |
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.
OR | COPPER FLARE | |
SEAL BONNET | ||
| ||
| MALE BRASS EQUALIZER | |
| LINE FITTING | |
| VAPOR LINE |
Page 15
XC17 SERIES