Cypress WPT - Page 115

115
Cypress Confidential
Using Trends – Too Much Cooling (example)
ZONE TEMPERATURE
• Morning A/C comes on
• Temp keeps dropping, even below
setpoint
DELTA SETPOINT MINUS ZONE TEMP
• Temperature way too cold, much below
setpoint most of the day
BRANCH PRESSURE
• Thermostat is trying to compensate for
over cooling all day long.
SETPOINT TEMPERATURE
•1
st
DR Event bumped up setpoint 2 deg
•2
nd
DR Event bumped up additional 2 deg
•Completion of Event – back to normal
Causes/Remedy:
•Faulty Reset Velocity Controller
•VAV Box Fault
•Adjacent Zone Overcooling