NOTICE
Avoid handling aluminum coil components after
handling the copper refrigeration piping or other tubing
without first cleaning hands.
NOTICE
Route the refrigeration piping to the coil in a manner
that does not obstruct service access to the coil, air
handling system, furnace flue, or filter.
1. Make suction and liquid line connections outside
of the cabinet. Leave the tubing connection panel
attached to the cabinet. Remove the coil access
panel for brazing. The lines are expanded to
receive the field refrigeration piping tubes for most
outdoor unit matches.
2. Remove the grommets where tubes exit the
cabinet to prevent burning them during brazing.
In some units, the vapor line grommet may be
shipped as a loose part with the unit.
3. Cut the end of the suction tube using a tube cutter.
Place the tube cutter as close as possible to the
end of the tube to allow as much depth as possible
for the connection and brazing of the suction line.
To ensure the suction line fits into the connection,
deburr the stub out (including inner pressure
protrusion from cutting).
4. If the coil has a factory installed TXV or EEV, go to
Step 5
or
if the coil does not have a factory installed
TXV or EEV, install the required size piston or TXV
kit. See
for detailed instructions.
5. If the coil has a factory installed TXV or EEV, remove
the liquid line copper cap that is soft soldered onto
the outside of the 3/8-in. stub protruding from the
front of the coil cabinet tubing panel as follows:
a. Screw a sheet metal screw into the center of
the cap.
b. Apply a small amount of heat to the cap while
pulling on the screw using slip joint pliers.
Important: For EEV equipped coils only
The EEV in this unit is shipped in the
closed position to protect the valve during
transportation.
Before brazing, do the following:
i.
Connect the communication cable
from the coil to the communication
port on the furnace or modular
blower control board.
ii. Connect and apply line power to the
field wiring terminals of the furnace
or modular blower and ensure the
board is powered for 60 s. This
ensures the EEV control board cycles
the valve to an open position. This
allows nitrogen to flow through the
system during brazing.
NOTICE
If power cannot be applied to the EEV control board
prior to brazing refrigeration piping, a tool is available
to manually operate the EEV. An EEV manual
operating tool can be purchased from Source 1 as
part number S1-02649686000. Six revolutions of the
tool opens the valve fully.
6. Insert liquid and suction lines into the coil
connections at the coil cabinet tubing panel.
7. Wrap a water-soaked rag around the coil
connection tubes inside the cabinet to avoid
transferring excess heat to the coil, TXV, EEV, and
temperature sensor if the coil is equipped with an
EEV.
8. Purge the refrigerant lines with dry nitrogen during
brazing.
NOTICE
All indoor coil connections are copper-to-copper and
must be brazed with a phosphorous-copper alloy
material such as Silfos-5 or equivalent.
Do not
use
soft solder.
9. Braze the suction and liquid lines and allow the
joints to cool.
10. If an EEV is used, route the EEV control
communicating cable through the suction line
opening.
11. Secure the sensing bulb and equalizer line capillary
tubes with nylon cable ties to prevent leaks from
the tubes rubbing.
12. If a piston is used, install the Schrader core into the
suction header, and reinstall the cap.
Installation Manual: XAF, XAH, and XAU Series - Full Cased and Uncased Coils for Cooling and Heat Pumps
28
Johnson Controls Ducted Systems
