JOHNSON CONTROLS
13
FORM ET130.13-NOM3 (708)
Electric Heat
Electric heat requires a minimum of
0.1” W.G. downstream static pressure
for proper operation.
Electric heaters come equipped with a primary auto-reset
limit switch to provide protection against overheating.
The primary auto-reset limit switch automatically cuts
the heater off when overheating occurs, and turns the
heater back on when the elements have cooled down.
Should the secondary one-time trip limit switch trip,
they will need to be replaced with a limit switch that
has the same trip temperature as the one-time trip limit
switch originally supplied with the electric heater.
Optional secondary manual reset limit switches are
available.
Electric heaters may be equipped with optional
disconnect switch, fuses and airfl ow proving switch.
Replacement
1. Disconnect all electrical power to the equipment,
tag and lock out power source.
2. Disconnect discharge ductwork from unit.
3. Remove electric heat assembly from equipment.
4. Before removing wires from the element rack
T-Plate, mark where the wires are connected so
that they can be reconnected correctly on the new
element rack.
5. Remove the wires and screws holding the heater
T-plate in the control enclosure and remove ele-
ment rack.
6. Insert new element rack into control enclosure and
replace screws to secure the element rack to control
enclosure.
7. Replace wires.
8. Close control enclosure cover before turning on
the power.
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