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120 UNT-IOM-6
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 33.
Horizontal units:
To remove the main drain pan on
a horizontal fan-coil unit, peel the
insulation from the edges of the
pans 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
34.
Note: Do not operate the fan-coil unit without the main and auxiliary
drain pans in place to prevent condensate leakage.
Make provisions to ensure adequate protection against coil freeze-up.
If the fan-coil units are not in operation, the coil/s should be vented at
the factory vent/s and drained at the piping system drain port/s. See
Table 38 on page 94 for approximate piping package volumes for
piping systems using ethylene glycol. Table 39 on page 94 lists
approximate hydronic coil volumes.
It is necessary to properly prepare the units for cold weather. If a coil
is not in use and is subject to temperatures below 32° F, drain the
coil to prevent coil freezeup. Locate the drain (installer supplied) in
the field piping system.
Winterizing the
Coil
Figure 33. To remove the main
drain pan on vertical fan-coil
units, disconnect the clips
holding the pan to the
fanboard.
Figure 34. 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.