KMC Controls BAC-8007 Installation Guide - Manual (Page 67)

reheat, the reheat output is modulated over the span of the Reheat loop. If the
Reheat loop is less than 10%, the reheat output remains at zero. The reheat is
set to zero if the Cooling loop is active.
See the topic Modulating reheat on page 52 for an application drawing.
Illustration 7–4 Modulating reheat operation
Room temp increase
HTG SP -2F
HTG SPAN
lo
o
p
%
0
100
10
HTG %
R
e
h
e
a
t
Staged reheat
If the controller is configured for staged reheat, it can control up to three
stages of reheat through binary triac outputs. The reheat outputs are
commanded
On when the Reheat loop rises above the On threshold and Off
when the loop drops below the Off threshold. Thresholds are described in the
following chart, Staged reheat thresholds on page 67 .
See the topic Staged reheat on page 51 for an application drawing.
Heating stages
Output state
On threshold Off threshold
Stage 1 35% 15%
Stage 2 65% 45%
Stage 3 95% 75%
Table 7–1 Staged reheat thresholds
Time proportioned reheat
For controllers configured for time proportional reheat, the duty cycle of a
binary triac output varies over a 10 second period. For example, if the Reheat
SimplyVAV Section 7: Sequences of operation
Revision E 67