Step 6 -- Installing Indoor Expansion Valve - Lennox SL18XC1 Installation Instructions Manual

STEP 6 -- INSTALLING INDOOR EXPANSION VALVE

THIS OUTDOOR UNIT IS DESIGNED FOR USE IN SYSTEMS THAT USE A CHECK EXPANSION VALVE METERING DEVICE. SEE THE LENNOX SL18XC1
PRODUCT SPECIFICATION BULLETIN (EHB) 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 SUCTION LINE SENSING BULB IN THE PROPER
ORIENTATION AS ILLUSTRATED TO THE RIGHT USING THE
CLAMP AND SCREWS PROVIDED.
NOTE - CONFIRM PROPER THERMAL CONTACT BETWEEN
SUCTION LINE AND CHECK EXPANSION BULB BEFORE IN­
SULATING THE SENSING BULB ONCE INSTALLED.
B. CONNECT THE EQUALIZER
FROM THE EXPANSION VALVE TO
THE EQUALIZER VAPOR PORT ON
THE SUCTION 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 SUCTION 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
1. REMOVE THE FIELD-PROVIDED FITTING THAT TEMPORARILY RECON­
NECTED THE LIQUID LINE TO THE INDOOR UNIT'S DISTRIBUTOR ASSEM­
BLY.
2. INSTALL ONE OF THE PROVIDED TEFLON
STUBBED END OF THE EXPANSION VALVE AND LIGHTLY LUBRICATE THE
CONNECTOR THREADS AND EXPOSE SURFACE OF THE TEFLON
WITH REFRIGERANT OIL.
3. 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.
4. PLACE THE REMAINING TEFLON
OF THE EXPANSION VALVE. LIGHTLY LUBRICATE CONNECTOR
THREADS AND EXPOSE SURFACE OF THE TEFLON
ERANT OIL.
5. 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
BULB
1/8 TURN
3 FLARE SEAL CAP
FIGURE 14
Page 11
11 12
10
9
8
7
6
®
RINGS AROUND THE
®
WASHER AROUND THE OTHER END
®
RING WITH REFRIG­
ON LINES SMALLER THAN
7/8",
12
BULB BULB BETWEEN THE 9 AND
3 O'CLOCK 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
NOTE - NEVER MOUNT
THE SENSING BULB ON
BOTTOM OF LINE.
FLARE NUT
COPPER FLARE
OR
SEAL BONNET
MALE BRASS EQUALIZER
LINE FITTING
SUCTION LINE
1/2 TURN
1
2
3
4
5
®
RING
MOUNT SENSING
NEVER MOUNT
BULB ON
SL18XC1 SERIES