Install Instructions
Table Of Contents
- Contents
- Section 1: About the controllers
- Section 2: Installing the controllers
- Section 3: Changing the room setpoint
- Section 4: Configuring the controllers
- Section 5: Balancing airflow
- Section 6: Application drawings
- Section 7: Sequences of operation
- Section 8: System integration and networking
- Appendix A: K-factors
- Index
Illustration 7–4 Modulating reheat operation
Room temp increase
HTG SP-2F
HTG SPAN
loop %
0
100
10
HTG %
Reheat
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 60.
See the topic Staged reheat on page 46 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 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 Time proportional reheat on page 48 for an application drawing.
Section 7: Sequences of operation KMC Controls, Inc.
60 Revision G