Honeywell EXCEL 5000 User Manual page 217

EXCEL CARE CONTROL ICONS ALPHABETIC REFERENCE
Reverse Acting Example A PID output can be an input to a SEQ icon that controls three functions (heating,
ventilating, and cooling):
The result of this control over a range of 18 through 22 might look like this:
219 74-5577–33 (US)
EN2B-0184 GE51 R0518 (Europe)