Optional Ecb25 Electric Heat - Lennox CBX25UH Series Installation And Service Procedure

Optional ECB25 Electric Heat

The electric heat sections provide field installed electric
heat for air handler units.
Table 2 shows the available heat sections. Refer to the
Product Specifications for heat section applications.
Table 2. Electric Heat Sections
Termination Type
2.5kW with stripped wires
5 kW with terminal block
5 kW with breaker
7.5 kW with breaker
7.5 kW with terminal block
10 kW with terminal block
10 kW with breaker
12.5 kW with breaker
15 kW with breaker
20 kW with breaker
HEAT SECTION INSTALLATION
Be sure to disconnect all power to the unit while you install
and service this equipment. Use proper tools and
protective equipment during installation and service.
Before installing the unit, check information on the unit
rating plate to ensure that the unit meets the job
specification, proper electrical power is available, and that
proper duct clearances are maintained.
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!
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 attaching
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 6
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 6). 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 6.
Catalog
Part Number
Number
0668142-10 89W42
0668142-02 89W43
0668142-03 89W44
0668142-04 89W45
0668142-05 89W46
0668142-06 89W47
0668142-07 89W48
0668142-11 89W49
0668142-08 89W50
0668142-09 89W51
HARNESS
SEPARATE CONNECTOR;
DISCARD WIRE HARNESS
Figure 6. 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 side opposite the side with the mounting
holes should slip behind the offset. The mounting holes
should then line up with holes in the air handler control
box.
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 7).
INSTALL 2 FIELD-PROVIDED SCREWS TO SECURE THE
FRONT OF THE HEATER CIRCUIT BREAKER ASSEMBLY TO
THE FRONT FLANGE OF THE AIR HANDLER.
Figure 7. Installing the Heat Element Assembly
Page 7
OFFSET
NO‐HEAT
REMOVE SCREWS;
SEAL PLATE
THEN REMOVE
NO-HEAT SEAL
WIRE
PLATE
REMOVE FASTENER SECURING WIRES
IF PRESENT
INSTALL SCREWS
REMOVED FROM
THE NO-HEAT
SEAL PLATE.