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Heat Section Installation
Before installing the electric heat section, check the unit
rating plate to ensure that the unit meets the job require-
ments, that proper electrical power is available, and that
proper duct clearances are maintained.
KNOCK OUT EXTENDED WIDTH WHEN USING
20KW OR 25KW ELECTRIC HEAT
FIGURE 1. Air Handler Electric Heat Knockouts
NOTE
–
It is easier to install the electric heat section in-
side the air handler unit before the unit is set and the ple-
num is attached.
1 -
Shut off all power to the air handler. More than one
disconnect may be required.
2 - Remove air handler access panel.
3 - Remove the electric heat knockout from the air
handler vestibule panel to accommodate the heater
being used. Remove the extended width knockout
to allow for installation of 20kW or 25kW heater (see
figure 1).
4 - 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 hole(s) on each side of the
heater line up with holes in the air handler control
box. Secure the electric heater into place with the
screws that are provided in the bag assembly.
Cabinet Modifications for 460 Volt, 3 Ton Models
Modifications are necessary when an ECB27-10F-G /
15F-G voltage (460 volt) electric heat section is installed
in a 460 volt, 3 ton air handler (see figure 2).
ISSUE:
SOLUTION:
Remove the tabs identified below.
Tabs restricting electric
heat section installation.
Tabs on a 460 volt, 3 ton air handler prevent proper installation of the ECB27-10F-G / 15F-G voltage (460 volt)
electric heat section.
FIGURE 2
. Cabinet Modifications
WARNING
Electric Shock Hazard. Can cause injury or
death. Unit must be properly grounded in
accordance with national and local codes.
Line voltage is present at all components
when unit is not in operation on units with
single-pole contactors. Disconnect all remote
electric power supplies before opening
access panel. Unit may have multiple power
supplies.
Circuit Breaker Installation
1 - Install the circuit breaker on the air handler deck
flange. Use the provided six screws to secure the
circuit breaker (see figure 3).
NOTE
–
When applied in the downflow position,
the cir-
cuit breakers must be rotated to the UP position
.
See
figure 3 and follow the procedure below:
A - Disconnect power to the unit if present.
B -
Remove the screw and slide the breakers off the
mounting rail.
NOTE
–
You may need to remove the wire tie closest to
the circuit breaker to allow rotation.
