841890-UIM-B-0612
4
LIMITATIONS
These coils should be installed in accordance with all national and local
safety codes.
SECTION III: COIL METERING DEVICES
An orifice or a TXV to be installed in the field. Refer to installation man-
ual with TXV kit. It is recommended to install the orifice or TXV kit prior
to installation of coil in cabinet and brazing line sets.
Consult the outdoor installation guide for outdoor units that require an
orifice as a metering device for the indoor coil. The orifice and the
Schraeder core are supplied with the outdoor unit. Install Schraeder
core in the suction line Schraeder body and cap with the supplied plas-
tic cap.
TXV METERING DEVICE
Please refer to Technical Guide to verify which TXV is installed in this
coil and that this is a valid system match for the AC or HP unit installed.
The temperature sensing bulb is attached to the coil suction header
line.
TABLE 4:
Coil Air Flow Limits
Coil
Size
Outdoor Unit
Tons
CFM Limits
Minimum Maximum
18 1-1/2 525 675
24
1-1/2 525 675
2 700 900
30, 32
2 700 900
2-1/2 875 1125
35
2-1/2 875 1125
3 1050 1200
36, 37
2-1/2 875 1125
3 1050 1350
42
3 1050 1350
3-1/2 1225 1575
43
3 1050 1350
3-1/2 1225 1575
48
3 1050 1350
3-1/2 1225 1575
4 1400 1800
60, 62, 64
4 1600 1800
5 1750 2250
For models that have factory installed TXV’s, take caution not to
apply high temperatures to the TXV assembly or equalizer line
while brazing.
FIGURE 3: TXV Bulb Installation
FIGURE 4: Proper Bulb Location
COIL UNDER PRESSURE.
Relieve pressure by depressing schrader stem. Coil may have fac-
tory installed TXV or may require orifice or TXV to be added. See
outdoor unit documentation for correct orifice or TXV to be used.
Refer to coil nameplate for orifice or TXV identification for this unit.
The coil should be open to the air for no more than 2 minutes to
keep moisture and contaminates from entering the system. If the
coil cannot be brazed into the refrigeration system in that time, the
ends should be temporarily closed or plugged. For a short term
delay, use masking tape over the ends of the copper tubing to close
the tube to the air. For a longer term delay, use plugs or caps.
There is no need to purge the coil if this procedure is followed.
Vapor
Line
Thermal
Expansion
Valve Bulb
Thermal
Expansion
Valve
Distributor
Body
Liquid
Line
TXV
Equalizer
Line
(Wrapped with
insulation)
TXV BULB
(Cover completely
with insulation)
SCREW
CLAMP
NUT
SUCTION LINE
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