Page 2
INSTALLER'S GUIDE
C. INSTALLATION with
TWE/TVF
Air Handlers
1. Position the air handler in the vertical position for ease
of installing the heater .
2. Remover the blower access panel from the front of the
air handler.
3. Unplug the female polarized plug from the male side.
The male side is mounted in a bracket on the upper
left hand corner of the air handler. The female side of
the polarized plug will be connected to the male
polarized plug of the heater.
4. Remove the cover from the heater field wiring and
control compartment box.
An adapter plate is
provided for heaters which are used with air
handlers that are 21.5” wide or wider. When
required, attach the adapter plate to the back of
the heater on the side opposite the knockouts
using 2 screws.
5. Remove the appropriate knockouts in the heater field
wiring compartment. See Figure 1 on page 2. Remove
the appropriate knockouts in the air handler for
making electrical connections to the heater. The holes
in the air handler must align with the holes in the
heater field wiring compartment.
6. Insert the heater assembly into the heater cavity of the
air handler so that the field wiring holes in the air
handler and the heater will align. Secure the heater
to the air handler compartment with the 4 screws
provided in the hardware envelope.
7. Install the hole plug from the hardware envelope in the
7/8” diameter hole in the side panel of the air handler,
adjacent to the air handler control box.
NOTE: Air handlers approved to use the 1426 heater have
a plate covering the lower 1.2” of the heater cavity.
This plate must be left in place for a blower barrier
seal. The plate is removed only when the 1426 heater
is used.
IMPORTANT: Conduit must attach directly to the
heater control box.
8. Make all wiring connections per applicable field wiring
diagrams. All instructions
must
conform to national
and local electrical codes.
9. Connect the female polarized plug (disconnected in
item 3) from the air handler control box to the male
polarized plug on the bottom of the heater control box.
10. Refer to the heater airflow chart on the air handler
rating nameplate for the appropriate minimum blower
speed tap selection to be used with the approved
heater installed.
11. For heaters with self contained circuit breakers, an
opening in the blower access panel is provided so that
the breakers may be operated without removal of the
blower access panel. Remove the metal cover from the
circuit breaker opening on the air handler access panel
and discard. Cut out the fiberglass insulation only in
the areas where the circuit breakers will extend
through the opening. Install the plastic “AirTite”
circuit breaker cover in the front panel opening with
the two screws provided.
12. Replace all panels removed during the heater instal-
lation.
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