CCP Controls & Automation Systems Flashcards
6 cards from real CCP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CCP Controls & Automation Systems flashcards as text
What is the purpose of calibrating sensors before functional performance testing of a control system?
Answer: To confirm sensors read accurately so control loops respond to true conditions
Sensor calibration ensures that readings sent to the controller reflect actual conditions; uncalibrated sensors cause control loops to respond to false data, producing incorrect system behavior.
A commissioning team is verifying an economizer control sequence. At what outside air condition should the economizer be fully open for free cooling?
Answer: When outside air enthalpy or dry-bulb temperature is below the economizer high-limit setpoint
The economizer opens fully for free cooling when outside air conditions (temperature or enthalpy) are below the high-limit setpoint, allowing outdoor air to cool the space without mechanical refrigeration.
During BAS commissioning, what is a 'point-to-point checkout'?
Answer: Confirming that each physical sensor/actuator is correctly wired and mapped to the correct BAS software point
A point-to-point checkout verifies that each field device is correctly wired, labeled, and mapped to the intended BAS software point before control sequences are tested.
What ASHRAE standard provides guidance on the sequence of operations for HVAC control systems in commercial buildings?
Answer: ASHRAE Guideline 36
ASHRAE Guideline 36 provides high-performance sequences of operation for HVAC systems, giving commissioning agents a benchmark for verifying BAS programming.
A Cx agent is testing a chilled water plant control sequence and finds the lead chiller starts before the condenser water pump is proven on. Why is this a problem?
Answer: The chiller could be damaged due to lack of condenser water flow during start-up
Chillers require proven condenser water flow before compressor start to prevent high-pressure lockout or refrigerant-side damage; starting without flow confirmation is a serious control sequence deficiency.
What is 'hardening' a BAS program, and when does it occur in the commissioning process?
Answer: Locking control parameters after verification so they cannot be changed without authorization, done near project close-out
Hardening locks setpoints, schedules, and program parameters after commissioning verification to prevent unauthorized changes that could degrade system performance.