Page 17
XP21 SERIES
STEP 6 -- INSTALLING INDOOR EXPANSION VALVE
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 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 ILLUS
TRATED BELOW.
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
REFERENCE DURING INSTALLATION OF EXPANSION VALVE
UNIT.
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. SEE SENSING BULB
INSTALLATION FOR BULB POSITIONING.
STUB
END
TEFLON
®
RING
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
DISTRIBUTOR
ASSEMBLY
THIS OUTDOOR UNIT IS DESIGNED FOR USE IN SYSTEMS THAT USE A CHECK EXPANSION VALVE METERING DEVICE. SEE THE
LENNOX XP21
PRODUCT SPECIFICATION
FOR APPROVED EXPANSION VALVE KIT MATCH-UPS AND APPLICATION INFORMATION.
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
®
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 APPROPRIATE
LY 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 RE
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.
VAPOR LINE
FLARE NUT
COPPER FLARE
SEAL BONNET
MALE BRASS EQUALIZER
LINE FITTING
FLARE SEAL CAP
OR
1
2
3
4
5
6
7
8
9
10
11 12
1/2 TURN
SENSING BULB INSTALLATION
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.
ON 7/8” AND LARGER LINES,
MOUNT SENSING BULB AT
EITHER THE 4 OR 8 O'CLOCK
POSITION. NEVER MOUNT
THE SENSING BULB ON
BOTTOM OF LINE.
12
ON LINES SMALLER THAN
7/8”, MOUNT SENSING
BULB BETWEEN THE 9 AND
3 O'CLOCK POSITIONS.
12
BULB
VAPOR LINE
NOTE - NEVER MOUNT
THE SENSING BULB ON
BOTTOM OF LINE.
BULB
BULB
BULB
9 O'CLOCK TO
3 O'CLOCK
1
2
3
4
5
6
7
8
9
10
11
12
1/8 TURN
FIGURE 16
