Heat Section Installation - Lennox CBA25UHV-018 Unit Information

Heat Section Installation

WARNING
Before installing or servicing unit, be sure
ALL power to the unit is OFF. More than one
disconnect switch may be present. Electrical
shock can cause personal injury or death!
Before installing the unit, check information on the unit
rating plate to ensure that the unit meets the job specifica-
tion, proper electrical power is available, and that proper
duct clearances are maintained.
NOTE – If installing heat sections at the same time as the
air handler unit, install the electric heat section in the air
handler unit before setting the air handler unit and attach-
ing the plenum.
1 - Shut off all power to the air handler unit. More than
one disconnect may be required.
2 - Remove air handler access panel and keep the six
screws to reattach access panel after installing heat
elements.
3 - Disconnect any existing field supply wires and pull
them out of the air handler. Disconnect and remove
wiring harness and fastener (see figure 5). If not
removed, these items will prevent the heat section's
base from resting properly in the compartment.
4 - Remove the no-heat seal plate in the air handler
frame (see figure 5).
NOTE – If a small heater is installed in the unit, the in-
staller will need to remove the no-heat plate and break it
apart at the perforations and reinstall the two pieces so
the smaller heater can be installed into the unit.
WIRE
HARNESS
SEPARATE CONNECTOR;
DISCARD WIRE HARNESS
FIGURE 5. Prepare to Install Heat Element
5 - Slide the electric heat section into the air handler. Be
careful that the heating elements do not rub against
the sheet metal opening when they slide into the
air handler. The mounting holes should then line up
with holes in the air handler control box.
NO HEAT
REMOVE SCREWS;
SEAL PLATE
THEN REMOVE
NO-HEAT SEAL
PLATE
REMOVE FASTENER SECURING WIRES
IF PRESENT
6 - Secure the electric heater assembly into place
with the screws that were removed from the heat
element panel. Install two field-provided #8 SDST
screws in the front of the electric heater assembly
(see figure 6).
INSTALL 2 FIELD-PROVIDED SCREWS TO SECURE THE
FRONT OF THE HEATER CIRCUIT BREAKER ASSEMBLY TO
THE FRONT FLANGE OF THE AIR HANDLER.
FIGURE 6. Installing the Heat Element Assembly
7 - The air handler's access panels have a cover
plate that is fastened with a screw and will need to
be positioned to fit either one breaker or two, but
do not install the access panel until all electrical
connections have been completed.
Foil face insulation must be cut to eliminate the possibility
for any frayed foil to come in contact with any main or low
voltage connections. Insulation must be kept a minimum
of 1/2" away from any electrical connection.
CHANGING CIRCUIT BREAKER ORIENTATION
The air handler comes from the factory ready for hori-
zontal right hand discharge installation. Always rotate the
breaker so up is the ON position in all orientations. The
circuit breaker orientation change is required by UL 1995,
Article 26.18 (25 September 2005).
1 - Locate the one clip located on the right side
(see arrow) of each breaker (see figure 8). The
clip secures the circuit breaker to the mounting
bracket. Pull the clip to release the breaker from
the mounting bracket and rotate the breaker to the
proper postition.
Page 17
INSTALL SCREWS
REMOVED FROM
THE NO-HEAT
SEAL PLATE.
WARNING