H6LT3 Flashcards
What are two types of time clocks available?
Electronic
Electromechanical
Self Test 3
Which type of time clock offers more features?
Electronic
Self test 3
What is the function of a duty cycle program?
To save electrical energy by switching equipment off for short intervals during the occupied period.
Self test 3
What is the function of an optimal start/stop program?
To save electrical energy by delaying morning start-up or advancing evening shut down through a “self learning” program
Self test 3
A programmable thermostat combines the features of which two devices?
Thermostat and electronic time clock
Self test 3
What does the term Direct Digital Control (DDC) refer too?
The control routine of stand-alone controllers, which is done in digital form.
Self test 3
What are the advantages of connecting a central computer to a network of stand-alone controllers?
Being able to carry out supervisory energy management strategies and perform central monitoring
Self test 3
What is Demand Limiting?
A feature that maintains the peak electrical demand of a building below a pre-set limit.
Self test 3
How is demand limiting accomplished?
By turning off non-essential loads as required.
Self test 3
What are some advantages of direct digital control?
Precise control
Reliability
Flexibility
LT3 PG45
Stand alone controllers are more sophisticated than time clock or thermostats because they can….
Measure signals from remote sensors
Do control routines in software
Send control signals to the actuators, fans, and pumps.
LT3 PG45
What type of time clock works by tripping pins as it rotates on 24 hour or 7 day dial?
Electromechanical
LT3 PG43
What time clock is microprocessor based and allows 365-day programming with special schedules for events such as holidays and daylight-savings?
Electronic.
LT3 PG43
Electromechanical time clocks can schedule start/stop times with what kind of accuracies?
15 minute accuracies.
LT3 PG43
Electronic time clocks have what kind of accuracy?
They are accurate to the minute.
LT3 PG43
