Lennox ML193UH Instruction Manual page 5

FEATURES
CABINET
Low-profile, narrow width cabinet allows easy
installation in upflow or horizontal applications.
Heavy-gauge, cold rolled steel construction.
Pre-painted cabinet finish.
Flanges provided on supply air opening for ease of
plenum connection or alignment with indoor coil.
Insulated cabinet with foil faced insulation on sides and
K
back of heating compartment.
Sealed blower compartment.
Complete service access.
Safety interlock switch automatically shuts off power to
unit when blower compartment access door is removed.
Gas piping and electrical inlets are provided in both
L
sides of cabinet.
Return Air Entry:
For bottom/end return-air entry for upflow/horizontal
applications, remove furnished bottom seal panel from
cabinet.
For side return-air entry (upflow applications only),
corners are marked on either side of cabinet for return
air cut-outs.
See dimension drawings.
NOTE - 60C and 60D size units that require air
volumes over 1800 cfm must have one of the
following:
1. Single side return air with transition, to accommodate
20 x 25 x 1 in. cleanable air filter. Required to
maintain proper air velocity.
2. Single side return air with Optional Return Air Base
3. Bottom return air.
4. Return air from both sides.
5. Bottom and one side return air.
See Blower Performance Tables for additional
information.
Coil Match-up
All furnaces exactly match C33 and CX34 cased upflow
indoor coils and CH33 horizontal indoor coils with
same letter designation in model number. No adaptor
required. Engaging holes furnished on cabinet for
alignment.
C33 uncased coils match furnaces without any
overhang but require an optional adaptor base or field
fabricated transition to match furnace opening. See C33
coil bulletin for additional information.
OPTIONS
Condensate Drain Heat Cable Kits
Self-limiting wattage heat cable prevents condensate
drain from freezing in unconditioned areas.
Available in 6, 24 or 50 ft. lengths.
Heat Cable Tape:
66 ft. length, 1/2 in. wide fiberglass.
60 ft. length, 2 in. wide aluminum foil.
Horizontal Suspension Kit
Provides suspension of unit and coil in horizontal
applications.
Allows complete service access.
Consists of corner mounted hanging brackets with
vibration isolators, return air end support rail and
hardware for assembly.
Metal hanging straps must be field provided.
Crawl Space Vent Drain Kit
Allows venting through a crawl space for upflow and
horizontal applications.
Includes 2 or 3 in. sanitary tee, 2 in. PVC assembly,
PVC boot and clamp.
Return Air Base
On furnaces with side return air and condensate trap on
the same side of the cabinet, a field fabricated transition
or Return Air Base is required when using an IAQ
product higher than 14-3/16 in. installed next to the unit
and serviced from the front.
IAQ products higher than 20 in. require a field fabricated
transition.
Must be used for 60C and 60D models with air volumes
over 1800 cfm in upflow applications when only one
side return is required.
Cabinet is shipped flat for easy field assembly and is
pre-painted steel to match the furnace.
See Dimension Drawing.
FILTER (NOT FURNISHED)
Filter and provisions for external mounting must be field
provided.
OPTIONS
Air Filter and Rack Kit for Horizontal Return Air
(End) Applications
Washable or vacuum cleanable polyurethane frame
type filter and external end return air rack available for
field installation.
Rack has filter door for easy filter servicing.
Flanges on rack allow easy duct connection.
See dimension drawing.
Air Filter and Rack Kit for Upflow Side Return Air
Applications - Not for use with Return Air Base
Washable or vacuum cleanable polyurethane frame
type filter and external side return air rack available for
field installation.
Available in single and ten pack kits.
Rack has filter door for easy filter servicing.
Flanges on rack allow easy duct connection.
Field installs on either side of unit cabinet. See
dimension drawing.
ML193UH / Page 5