Installation and Maintenance Manual

Maintenance
UNT-SVX07D-EN 107
Main Drain Pan
See Figure 38 to replace main drain correctly.
Vertical Units. To remove the main drain pan on vertical
fan-coil units, disconnect the clips holding the pan to the
fanboard. Disconnect the main and overflow drain hoses
and slide pan forward to remove (see Figure 39).
Horizontal Units. To remove the main drain pan on a
horizontal fan-coil unit, peel the insulation from the edges
of the pan’s underside to access the mounting screws.
Remove the screws and lower the end of the drain pan
closest to the control box. Remove the drain spout by
pulling it from the hole in the chassis end panel (see
Figure 40).
Note: Do not operate the fan-coil unit without the main
and auxiliary drain pans in place to prevent
condensate leakage.
Coil Maintenance
Keep coils clean to maintain maximum performance. For
operation at its highest efficiency, clean the coil often
during periods of high demand or when dirty conditions
prevail. Clean the coil a minimum of once a year to prevent
dirt buildup in the coil fins, where it may not be visible.
Remove large debris from the coils and straighten fins
before cleaning. Remove filters before cleaning.
Clean the coil fins using steam with detergent, hot water
spray and detergent, or a commercially available chemical
coil cleaner. Be sure to rinse coils thoroughly after
cleaning.
Inspecting and Cleaning Coils
Coils become externally fouled as a result of normal
operation. Dirt on the coil surface reduces it’s ability to
transfer heat that can result in comfort problems,
increased airflow resistance and thus increased operating
energy costs. If the coil surface dirt becomes wet, which
commonly occurs with cooling coils, microbial growth
(mold) may result, causing unpleasant odors and serious
health-related indoor air quality problems.
Inspect coils at least every six months or more frequently
as dictated by operating experience. Cleaning frequently
Figure 38. When replacing the fan-coil’s main drain pan,
install it correctly under the z-bar.
Figure 39. To remove the main drain pan on vertical fan-
coil units, disconnect the clips holding the
pan to the fanboard.
Z-Bar
Main Drain
Coil
Side
Clips Hold Drain Pan in Place
Figure 40. To remove the main drain pan on horizontal
fan-coil units, peel the insulation from the
edges of the pan’s underside to access the
mounting screws.
WARNING
Hazardous Chemicals!
Coil cleaning agents can be either acidic or highly
alkaline. Handle chemical carefully. Proper handling
should include goggles or face shield, chemical
resistant gloves, boots, apron or suit as required. For
personal safety refer to the cleaning agent
manufacturer’s Materials Safety Data Sheet and follow
all recommended safe handling practices. Failure to
follow all safety instructions could result in death or
serious injury.
Mounting Screw
UNT-SVX07_-EN.book Page 107 Friday, April 27, 2012 9:40 AM