18-AH47D1-2
3
Section 2. Overview and Common
Steps
These instructions are designed for installing a
replacement coil into a previously installed air
handler.
The air handler may be installed in one of the fol-
lowing orientations: upflow, downflow, horizontal
left or horizontal right. In addition, the coil could
be a flat coil (not pictured) or an “A” coil as shown
in Figure 1.
Note: If system is configured in downflow ori-
entation, additional components will need to be
ordered. See AH parts list.
Actual air handler units and coil configurations
may differ from models depicted.
2.1 Common Preparation Steps
1) Pump down or recover the refrigerant in the
system.
2) Turn off high voltage power to the unit.
2) Remove the condensate drain line from the
indoor coil. Be prepared to catch any water
that might be in the drain line and drain pan.
3) Disconnect the refrigerant lines to the indoor
coil. Be sure to protect the refrigerant lines
so debris does not enter the piping system.
(FCCV section has unique instructions.)
4) Remove the air handler’s front panels. Retain
all screws to reinstall panels in a later step.
2.2 Common Coil Removal and Retrofit
Three types of installations exist. For the specific
configuration, refer to the appropriate section
below:
1)
Mechanically Fitted TEV (Thermal
Expansion Valve)
See Section 3
2)
Brazed TEV (conversion to mechani-
cally fitted coils is required)
See Section 4
3)
FCCV–Flow Control Check Valve,
sometimes referred to as an orifice
See Section 5
For coil replacement and reconnection instruc-
tions, see
Section 6.
Figure 1 - “A” Coil
