Lennox G43UF SERIES

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 expansion
valve in a manner that will provide access for field servicing
ON 71e' AND LARGER LINES,
MOUNT SENSING llUL8 AT
EITHER THE 4 OR 8 O'CLOCK
POSITION. NEVER MOUNT ON
BonOM OF LINE.
of the expansion valve. Refer to below Illustration for
reference during installation of expansion valve unit.
Remove the field-provided filling thlll lempo'rllry 1/2 Turn
reCQnnectlld\he liquid line 10 the indoor un"'s distributor @
assembly 1
11161ell one of the provided Tllnor1'D rings around th9 10
litubbed end or the expansion valve and lightly lubricate 9B 4
the oonnedor \hreads and ellpo&e surfeoe Qllhe Tenor19 7
ring wtth relJ1gerant all.
AttaCh Ihe Blubbed end of thll expansion vallie 10 11'19
liquid line ortftce housing. Finger U\t1len and use an
approptlalelysl:ted wrench 10 IIJm an addilionll1112 tum
cloekwlull ell illustrated in \he figure abolle, or 20 It-lb.
PIIIOll the remllining Tefto~ waSher around 11'111 other
lind
of \he expansIon lIalv9. Lightly lubricato oonneclor
Ihreads lind oxpose SUrfllCll of the TenoriD ring with
reffigerantoil.
AtlBch the liquid line e55embly to Ihe expansion valliB.
FIng9l' Ug/1ten IUld use an appropl1lltllly sIzed wrench 10
tum en addilionll' 1/2 lum clockwise 98 illuli1nltlld in \he
figure abovll or 20 ft-lb.
A Altach lhe vapor line sensing bulb in the proper
orlentatlonas lIIuSl1ll1ed 10 the righl using the clamp and I
licrews provided. 1 8 Turn
NOTE - Confirm ptop~r thermal conflict between Vllpor lin a G
and expansion bulb before insulallng the sensing bulb once 10 I
Installed. ~ .
8 ConMCI U'le equalizer line [rom thll expansion valllB 10 8 7 4
the equal~er vllpor port on \he vapor line. Finger tlghtun
lhe ftare nut plus 1/8 lum (7 ft-lbB) aB illusirellld below.
ON LINES SMALLER THAN
7/8', MOUNT SENSING
BULB AT EITHER THE 3 OR
9 O'CLOCI( pOSI'TION.
c
B
A
SENSING BULB INSTALLA1'ION
LIQUID LINE
-- MALE DRASS eQUALIZER
LINE FIniNG
o
MALE EOUALIZER LINE
FIniNG (SEE
EQUALIzeR LINe
INSTALLATION FOR
FURTHER DETAILS)
Sensing bulb insulalion is required If
mounllldexlemllito
\ho 0011 ailIng. sensing
bulb In5lalleUon [or bulb poslUoning.
A Remove lind discard eilher the flare seel cap or ftare nut
wi\h oopper "are seal bonnet from the equillizer line port
on thll vllpor line liS iIIuslrated In \he flsure to the right.
B Remolle and discard eilher tho nare seal cap or flare nul
wllh
copper flare 60<11 bonnet from the eqUllllzer Iina port Ofl
Ihe vapor IIfle as illustrated In the IIgure to the I1ghl.
FLARE SEAl CAP --$J ~RARENUT
I
I
OR ~-- COPPE~ FLARE
~ SEAL DONNET
L __ ~
EQUALIZER LINE INSTALLATION
See the Lennox 13ACX Engineering Handbook for
approved expansion valve kit match-ups. The expansion
NOTE - NEVER MOUNT ON BOTTOM 01' LIN~.
Figure 9. Installing Indoor Expansion Valve
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