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D-Optional Electric Heat Components
Table 3 shows electric heat fuse ratings. See Options/
EHA match-ups. See Electrical/Electric Heat Data section
and capacities.
All electric heat sections consist of electric heating
response to thermostat demand.
1-Contactors K15, K16
contactors located on the electric heat vestibule. All
contactors are equipped with a 24VAC coil. The coils
second stage heating elements.
2-High Temperature Limits S15 (Primary)
located on the back panel of the electric heat section below
the electric heat section thermostat is factory set to open
++
+ +
+
+
++
The thermostat is not adjustable.
3-High Temperature Limit S20, S157, S158, S15, S160
& S161 (Secondary)
Limits are SPST normally closed manual-reset thermostat
are de-energized. The thermostat is factory set to open
+ +
and can be manually reset when temperature falls below
4-Terminal Block TB2
Terminal block TB2 is used for single point power
TB3. Units with multi-point power connections will not use
TB2.
5-Terminal Block TB3
Electric heat line voltage connections are made to terminal
block TB3 located in the upper left corner of the electric
heat vestibule. TB3 distributes power to the electric heat
components.
6-Heating Elements HE1 through HE6
Heating elements are composed of helix wound bare
nichrome wire exposed directly to the air stream. Three
elements are connected in a three-phase arrangement.
The elements in 208/230V units are connected in a
independently by the corresponding contactors located on
transfer is instantaneous. High temperature protection
is provided by primary and redundant high temperature
limits and overcurrent protection is provided by fuses.
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