Johnson Controls XAF Series, Installation Manual, Page: 25 / 36

Figure 35: Coil shelf installation position
8. Install the appropriate metering device (piston or
TXV). See Installing a piston or Installing a TXV for
detailed instructions.
9. Install the coil through the plenum opening, and
position the coil onto the coil shelf over the furnace
opening as shown in Figure 32.
Note: If using a TXV, do not attach the bulb to
the suction line until brazing is complete and
the piping has cooled.
10. Fabricate a coil access panel as shown in Figure
36 using the letter measurements in Table 7.
Before making any bends or cuts, use the paper
template provided in Figure 43 to mark the drain
and refrigeration piping openings on the coil
access panel.
11. Fabricate three standard S-Locks for coil access
panel installation. See Figure 36 and Table 7 for the
designated sizes. Install standard S-Locks onto the
sides and top edges of the plenum access opening.
12. Install the coil access panel onto the plenum. Screw
the coil access panel in place at the bottom 1/2-in.
flange and the top flange at the top S-Lock.
13. Complete brazing of the refrigeration piping
connections. See Connecting refrigerant lines
for detailed instructions. Allow the piping to cool
before installing the vapor line gasket and TXV
temperature bulb if applicable.
14. If a TXV is installed on the coil, attach the TXV
sensing bulb to the vapor line.
15. Check for air leakage around the access door and
between the duct work and upflow furnace. Seal
any leaks appropriately, using duct mastic or silicon
sealant to seal all openings.
Installation Manual: XAF, XAH, and XAU Series - Full Cased and Uncased Coils for Cooling and Heat Pumps 25
Johnson Controls Ducted Systems