Duct System; Installing Optional Cooling Coil - Lennox Merit Series Installation Instructions Manual

DUCT SYSTEM

The unit is provided with knock-outs for either right or left-
side connection of the supply and return air plenums.
Refer to the dimensioned drawing on page 2 to locate and
size the plenum entry into the side of the building.
Cover plates are provided to seal the unused knock-outs and
these become convenient access ports for regular service
and maintenance.
Size and install supply and return air duct system using
industry-approved standards that result in a quiet and
low-static system with uniform air distribution. The furnace
access panel must always be in place when the unit is in
operation and it must not allow leaks into the duct system.
Construct a protective covering made of suitable materials to
shield the plenum connections from rain. Rain shield should
be attached to the side of the unit cabinet above the plenum
connections and span the distance to the building wall above
the plenum entry into the structure. Rain shield connections
must be caulked so that they are weather-tight.
INSTALLING OPTIONAL
COOLING COIL
If optional cooling coil is to be used, install coil according to
the steps indicated below:
1. Remove Lennox Merit Series
panel.
NOTE: Installation of larger evaporator coils may require
removal of unit top panel as well.
2. Place cooling coil on unit coil deck in cooling
compartment.
3. Using template provided with the coil, cut holes for
refrigeration and drain piping. Align coil with piping holes
in panel. Seal holes around piping.
4. Reinstall Lennox Merit Series
5. Make refrigerant piping connections to condensing unit
per local codes and sound plumbing practices.
Gas Furnace unit rear
™
panel.
™
5