44
Ducting
DUCTING
HORIZONTAL INSTALLATIONS
1. Position the unit to minimize long runs of duct or runs of
duct with many turns and elbows.
2. If summer air conditioning is desired, position the in-
door coil on the supply air side of the unit. Ensure that
no air can bypass this coil.
3. Connect the furnace to the supply air plenum.
4. Connect the return air ducting to the return air opening
at the return-air end of the unit. Make the connection air
tight to prevent the migration of toxic fumes and odors
including carbon monoxide from migrating into the liv-
ing space from an adjacent fuel-burning appliance.
NOTE: In horizontal configuration, side return air cut
out is not permitted.
5. If a filter is installed near the furnace, be sure to
have adequate space for installation and removal of
the unit filter.
NOTE: DO NOT take return air from furnace rooms,
garages or cold areas. Avoid return air from utility
rooms, kitchens, laundry rooms and bathrooms.
FIGURE 10
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