4
18-AD43D1-1A-EN
Installer’s Guide
Figure 6
I. CLEANING THE COIL
The two piece door allows removal of the outer casing doors
without interference from refrigerant or condensate lines.
The foil covered insulation on 4PXC coils should be wiped down
and residual dirt and dust should be vacuumed up to maintain
good air quality. See Figure 6.
The manufacturer’s recommendation for coil cleaning is to initially
use only water to wash away debris that may have collected on
and in the coil fin surface. Removing an evaporator coil is the best
way to effectively clean a coil that is heavily contaminated. This
is accomplished by removing the coil from the cabinet, sealing
the liquid and vapor line and using a strong water stream such
as from a garden hose, being careful to prevent fin damage. Use
chemical cleaners, only when necessary.
H. CONDENSATE DRAIN PIPING
Condensate drain connections are located in the drain pan at
the bottom of the coil/enclosure assembly. The female threaded
fitting protrudes outside of the enclosure for external connection.
A field fabricated trap is not required for proper drainage due to
the positive pressure of the furnace; however, it is recommended
to prevent efficiency loss of conditioned air.
1. The drain hole in the drain pan must be cleared of all insulation.
2. Insulate the primary drain line to prevent sweating where
dew point temperatures may be met. (Optional depending on
climate and application needs)
3. Connect the secondary drain line to a separate drain line (no
trap is needed in this line).
NOTE:
Refer to Service Guideline, UN-SVG001C-EN, Evaporator
Coil Cleaning and Condensate Drain Maintenance Guide-
lines for important information on cleaning coils with
chemical treatments.
