Lennox XC25-024-230-01 Installation And Service Procedure page 20

FLUSHING LINE SET AND INDOOR COIL (2 OF 2)
4
TYPICAL NEW CHECK EXPANSION VALVE INSTALLATION PROCEDURE
THIS OUTDOOR UNIT IS DESIGNED FOR USE IN SYSTEMS THAT USE A CHECK EXPANSION VALVE METERING DEVICE. SEE LENNOX XC25
PRODUCT SPECIFICATIONS FOR APPROVED EXPANSION VALVE KIT MATCH-UPS AND APPLICATION INFORMATION.
TWO PIECE
(Uncased Coil Shown)
PATCH PLATE
(UNCASED
LIQUID LINE
COIL ONLY)
ORIFICE
HOUSING
DISTRIBUTOR
TUBES
DISTRIBUTOR
ASSEMBLY
MALE EQUALIZER LINE
FITTING (SEE
EQUALIZER LINE
INSTALLATION FOR
FURTHER DETAILS)
SENSING BULB INSULATION IS REQUIRED
IF MOUNTED EXTERNAL TO THE COIL
CASING. SEE SENSING
INSTALLATION FOR BULB POSITIONING.
SENSING BULB INSTALLATION
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 CHECK EXPANSION BULB BEFORE INSU­
LATING THE SENSING BULB ONCE INSTALLED.
B. CONNECT THE EQUALIZER
FROM THE EXPANSION VALVE TO
THE EQUALIZER VAPOR PORT ON
THE VAPOR LINE.
TIGHTEN THE FLARE NUT PLUS
1/8 TURN (7 FT-LBS) AS ILLUS­
TRATED BELOW.
EQUALIZER LINE INSTALLATION
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.
XC25
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 CHECK EXPANSION VALVE IN A MANNER
THAT WILL PROVIDE ACCESS FOR FIELD SERVICING OF THE
EXPANSION VALVE. REFER TO BELOW ILLUSTRATION FOR
STUB
REFERENCE DURING INSTALLATION OF EXPANSION VALVE
END
UNIT.
EXPANSION
VALVE
TEFLON
RING
®
TEFLON
SENSING
RING
EQUALIZER
LINE
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
VAPOR
LINE
LIQUID LINE
BULB
LINE
11 12
FINGER
10
9
8
7
6
®
A. REMOVE THE FIELD-PROVIDED FITTING THAT TEMPORARILY RECON­
NECTED THE LIQUID LINE TO THE INDOOR UNIT'S DISTRIBUTOR AS­
SEMBLY.
B. INSTALL ONE OF THE PROVIDED TEFLON
LINE
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 IL­
LUSTRATED IN THE FIGURE ABOVE, OR 20 FT-LB.
D. PLACE THE REMAINING TEFLON
OF THE EXPANSION VALVE. LIGHTLY LUBRICATE CONNECTOR
THREADS AND EXPOSE SURFACE OF THE TEFLON
FRIGERANT OIL.
E. ATTACH THE LIQUID LINE ASSEMBLY TO THE EXPANSION VALVE. FIN­
GER 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.
BULB
VAPOR LINE
VAPOR LINE
1/8 TURN
BULB
1
2
NOTE - NEVER MOUNT THE SENSING BULB ON
3
4
5
FLARE SEAL CAP
20
10
9
8
®
WASHER AROUND THE OTHER END
9 O'CLOCK TO
3 O'CLOCK
12
BULB
ON 7/8" AND LARGER LINES,
MOUNT SENSING BULB AT
EITHER THE 4 OR 8 O'CLOCK
POSITION.
THE
12
BOTTOM OF LINE.
BULB
BOTTOM OF LINE.
OR
MALE BRASS EQUALIZER
LINE FITTING
1/2 TURN
11 12
1
2
3
4
5
7
6
®
RINGS AROUND THE
®
®
RING WITH RE­
ON LINES SMALLER THAN
7/8", MOUNT SENSING
BULB BETWEEN THE 9
AND 3 O'CLOCK
POSITIONS.
NEVER MOUNT
SENSING BULB ON
FLARE NUT
COPPER FLARE
SEAL BONNET
VAPOR LINE