Flushing Line Set And Indoor Coil; Typical New Check Expansion Valve Installation Procedure; Sensing Bulb Installation; Equalizer Line Installation - Lennox XP25-024-230-01 Installation And Service Procedure

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 THE LENNOX XP25
PRODUCT SPECIFICATION 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
EQUALIZER
DISTRIBUTOR
ASSEMBLY
LINE
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 VA­
POR LINE AND CHECK EXPANSION BULB BEFORE INSULATING
THE SENSING BULB ONCE INSTALLED.
B CONNECT THE EQUALIZER
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 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.
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
WHICH PROVIDES 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
LINE
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
VAPOR
LINE
LIQUID LINE
BULB
LINE
11 12
1
2
10
9
4
8
5
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
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.
9 O'CLOCK TO
3 O'CLOCK
BULB
VAPOR LINE
VAPOR LINE
1/8 TURN
BULB
NOTE - NEVER MOUNT THE SENSING BULB ON
3
FLARE SEAL CAP
Page 20
11 12
10
9
8
7
6
®
RINGS AROUND THE
®
WASHER AROUND THE OTHER END
ON LINES SMALLER THAN
7/8", MOUNT
12
BULB BULB BETWEEN THE 9
AND
POSITIONS.
ON 7/8" AND LARGER LINES,
MOUNT SENSING BULB AT
EITHER THE 4 OR 8 O'CLOCK
POSITION.
THE SENSING
12
BOTTOM OF LINE.
BULB
BOTTOM OF LINE.
FLARE NUT
COPPER FLARE
OR
SEAL BONNET
MALE BRASS EQUALIZER
LINE FITTING
VAPOR LINE
1/2 TURN
1
2
3
4
5
®
®
RING WITH RE­
SENSING
3 O'CLOCK
NEVER MOUNT
BULB ON
XP25