Page 10
Circuit Breaker (CB1, CB2, and CB3)
(208/230 volt only)
Line voltage connections are made to circuit breakers
CB1, CB2, and CB3 in the electric heat sections with circuit
breakers (designated by CB in the model numbers) then
routed to the CB unit through J/P2 . The Electric Heat Data
on pages 15-25 show the amp rating for each circuit
breaker used. Single-phase electric heat uses two-pole
circuit breakers; while three-phase electric heat uses
three-pole circuit breakers.
Terminal Strip (TB2) 208/230 volt only)
For the electric heat sections without circuit breakers or
fuses, line voltage connections are made to terminal strip
TB2 then routed to the CB unit through J/P2 The terminal
strip is located in the lower left corner of the electric heat
vestibule panel. Single-phase electric heat uses two-pole
terminal strips; while three-phase electric heat uses three-
pole terminal strips.
Heating Elements (HE1 through HE6)
Heating elements are composed of helix wound bare
nichrome wire exposed directly to the air stream. The
elements are supported by insulators mounted to the
wire frame. For single-phase applications, one ele
ment is used per stage. Each stage is energized in
dependently by the corresponding relay located on
the electric heat vestibule panel. All three-phase
heating elements are arranged in a three-phase del
ta. Once energized, heat transfer is instantaneous.
High temperature protection is provided by primary
and secondary high temperature limits.
FIGURE 5
ECB29‐2.5, ‐5, ‐5CB, -6, -6CB 208/230 SINGLE-PHASE
ELECTRIC HEAT VESTIBULE PARTS ARRANGEMENT
TERMINAL BLOCK
(TB2)
CIRCUIT BREAKER
(CB1)
PRIMARY LIMIT (S15)
& SECONDARY LIMIT (S20)
ELECTRIC HEAT
ELEMENT (HE1)
ELECTRIC HEAT
VESTIBULE PANEL
ELECTRIC HEAT
SEQUENCER RELAY (K32)
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