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5292154-UIM-A-0317
Johnson Controls Unitary Products
9
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 17.
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 17 and 18, 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 Fig-
ure 19.
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.
ELECTRONIC EXPANSION VALVE (EEV) EQUIPPED
COILS
Coils equipped with an EEV are available for use with a fully modulating
matched system. The EEV and controls are factory installed. The
installer only has to connect the included communication (4-wire) cable
to the communicating 4-pin connector on the furnace or modular blower
control board. See Figure 21 & 22 for connection diagrams and Figure
23 for wiring diagram.
FIGURE 16:
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.
FIGURE 17:
TXV Bulb and Equalizer line Installations
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
!
!
TXV BULB
(W
ra
p w
it
h
insu
l
ati
o
n
.)
VAP
O
R LINE
LI
Q
UID LINE
TVX
E
Q
UALIZER
LINE
THER
M
AL EXPAN
S
I
O
N
VALVE (TXV)
DI
S
TRIBUT
O
R
B
O
DY
A
0
27
9
-
00
2
FIGURE 18:
Proper Bulb Location for TXV
FIGURE 19:
Vertical Temperature Bulb Orientation
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
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