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APPENDIX C - 42CE/42DC RETURN MODIFICATION
Below are the procedures for converting furred-in ceiling
model fan coils with factory-installed plenum's from rear return
to bottom return.
Precautions —
Use eye, ear, and hand safety gear prior
to handling sheet metal or modifying any fan coil units.
42CE and 42DC Units —
All necessary holes for at-
tachment are present on the unit.
Do not drill new holes.
Use #8 sheet metal screws for all attachments.
42CE Rear to Bottom Return Conversion (Typ-
ical 42CEA03 Rear Return Unit Shown in Pic-
tures Below)
1. Remove filter and access panel.
2. Install access panel on the rear of the unit with 5 screws.
3. Bend the tabs on each of the plenum side panels to hold
the filter in place.
4. Install filter.
5. Use aluminum tape to cover up the holes on both of the
plenum side panels.
To convert a Bottom Return unit to Rear Return, follow the
same process but ensure you bend the correct tabs for holding
the filter in place.
42DC Rear to Bottom Return Conversion (Typ-
ical 42DCA03 Rear Return Unit Shown in Pic-
tures Below)
1. Remove filter bracket and take out the filter.
FILTER
ACCE
SS
PANEL
TABS
APPLY TAPE
HERE
BRACKET
(REMOVE)