5169032-UIM-C-0416
8
Johnson Controls Unitary Products
3.
Place a backup wrench on distributor, loosen and remove brass
distributor nut. Retain brass nut for use on liquid line. Keep Teflon
washer in place and discard clear disk.
4.
Install the thermal expansion valve to the distributor assembly with
supplied fittings. Ensure Teflon washer is seated in distributor.
Hand tighten and turn an additional 1/4 turn to seal. Do not over-
tighten fittings. See Figure 11.
5.
Slide the nut removed in step 3 over the supplied liquid line. Place
supplied Teflon washer from TXV kit in place on TXV, and install liq-
uid line to the top of the thermal expansion valve. Adjust assembly
so liquid line aligns with hole in access panel. See Figure 9. Hand
tighten the liquid line, and apply an additional 1/4 turn to seal.
6.
Install the TXV equalizer line onto the vapor line by hand tightening
the 1/4” SAE coupling nut to the equalizer fitting, and apply an addi-
tional 1/3 turn to seal. See Figure 12.
7.
Pass the temperature sensing bulb tube for the TXV through the
tube opening in the split grommet of the access panel.
8.
Install the TXV bulb to the vapor line near the cabinet, using the
bulb clamp(s) furnished with the TXV assembly. Ensure the bulb is
making maximum contact. See Figures 12 & 13, and accomplish
the following:
a.
If possible, install the temperature bulb on a horizontal run of
the vapor line. Ensure that the bulb is installed at a 10 o’clock
or 2 o’clock position.
b.
If bulb installation is made on a vertical run, ensure
that the bulb is a minimum of 8 inches (20.3 cm) away
from elbow coming out of the coil. Position the bulb
with the tail of the bulb at the top, so that the bulb acts
as a reservoir.
See Figure 14.
c.
Insulate the bulb using thermal insulation provided to protect
it from the effect of the surrounding ambient temperature.
Cover completely to insulate.
9. After line set is installed, leak test the system.
CAUTION
Do not over-torque. Do not use slip joint pliers. This will distort the
aluminum distributor and the brass fitting (potentially causing leaks).
FIGURE 11:
TXV Installation
WARNING
Schrader valve core MUST NOT be installed with TXV installation.
Poor system performance or system failure could result.
CAUTION
In all cases, mount the TXV temperature sensing bulb after vapor line
is brazed and sufficiently cooled.
Failure to use suction line split grommet may result in TXV failure.
!
TXV / DI
S
TRIBUT
O
R
CO
UPLING
LI
Q
UID LINE / TXV
CO
UPLING
TEFL
O
N WA
S
HER
TXV
TEFL
O
N WA
S
HER
DI
S
TRIBUT
O
R
A
0
28
1
-
00
2
!
!
FIGURE 12:
TXV Bulb and Equalizer line Installations
FIGURE 13:
Proper Bulb Location
FIGURE 14:
Vertical Temperature Bulb Orientation
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TXV BULB
(
C
ov
er
co
m
pl
ete
l
y
w
it
h
insu
l
ati
o
n
.)
VAP
O
R LINE
O
F LINE
S
ET
A
0
26
9
-
00
2
C
LA
M
P
A
DETAIL A
TXV
S
EN
S
ING BULB
(P
ass
t
h
r
o
ug
h
s
pl
it
hol
e
in
gr
o
mmet
.)
VAP
O
R
LINE
NUT
NUT
B
u
lb
at
10
o’clock
po
siti
o
n
.
B
u
lb
at
2 o’clock
po
siti
o
n
.
SC
REW
SC
REW
C
LA
M
P
VAP
O
R LINE
O
F LINE
S
ET
A
0
378-
00
2
C
LA
M
P
TXV
TE
M
PERATURE
BULB
TAIL END UP
8” (2
0
.3 c
m
)
NOTE:
E
nsure
b
u
lb
is
o
n
oppo
site
side
o
f
tu
b
ing
b
end
pl
ane
.
