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 loop is at 50%, the reheat output is
ON
for 5 seconds and
OFF
for 5 seconds. If the Reheat loop is less than 10%, the reheat
output remains at zero.
See the topic
for an application drawing.
Illustration 7–5 Time proportional reheat operation
Room temp increase
HTG SP
-2F
HTG SPAN
lo
o
p
%
0
100
10
HTG %
R
e
h
e
a
t
Floating reheat
If the controller is configured for floating reheat, it controls two binary triac outputs to drive
the inputs of a tri-state actuator connected to a valve. If the Reheat loop is less than 30%, the
valve is driven closed. If the loop is greater than 70%, the valve is driven open. If the loop is in
between 30% and 70%, no valve action is taken.
See the topic
for an application drawing.
Illustration 7–6 Floating reheat operation
HTG %
DRIVE
OPEN
DRIVE
CLOSED
lo
o
p
%
0
100
70
R
e
h
e
a
t
30
HTG SP
HTG SPAN
-2F
Room temp increase
NO ACTION
SimplyVAV
Section 7: Sequences of operation
Revision H
59
Summary of Contents for SimplyVAV BAC-8001
Page 1: ...SimplyVAV Application and Installation Guide Revision H ...
Page 12: ...Section 1 About the controllers KMC Controls Inc 12 Revision H ...
Page 48: ...Section 6 Application drawings KMC Controls Inc 48 Revision H ...
Page 62: ...Section 7 Sequences of operation KMC Controls Inc 62 Revision H ...
Page 72: ...Appendix A K factors KMC Controls Inc 72 Revision H ...
