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FIGURE 16: TXV Installation
WARNING
!
Schrader valve core MUST NOT be installed with TXV installation.
Poor system performance or system failure could result.
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.
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.
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.
TXV BULB
(Wrap with
insulation.)
DISTRIBUTOR
BODY
FIGURE 17: TXV Bulb and Equalizer line Installations
Johnson Controls Unitary Products
LIQUID LINE / TXV COUPLING
TEFLON WASHER
TXV
TXV / DISTRIBUTOR COUPLING
TEFLON WASHER
DISTRIBUTOR
VAPOR LINE
LIQUID LINE
TVX
EQUALIZER
LINE
THERMAL EXPANSION
VALVE (TXV)
9. After line set is installed, leak test the system.
Bulb at
10 o'clock
position.
CLAMP
VAPOR
LINE
NUT
DETAIL A
SCREW
A0281-002
FIGURE 18: Proper Bulb Location for TXV
FIGURE 19: Vertical Temperature Bulb Orientation
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.
A0279-002
TXV SENSING BULB
(Pass through split hole
in grommet.)
SCREW
NUT
CLAMP
Bulb at
2 o'clock
position.
5292154-UIM-A-0317
TXV BULB
(Cover completely
with insulation.)
A
VAPOR LINE
OF LINE SET
A0269-002
9
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