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Author Question: Pneumatic control systems A) are the most recent type of commercial control B) Use air pressure ... (Read 72 times)

Sufayan.ah

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on: Jul 27, 2018
Pneumatic control systems
 
  A) are the most recent type of commercial control B) Use air pressure to modulate control valves
  C) Have no moving parts D) Use electric motors to modulate control valves

Question 2

The primary control for all HVACR functions in a direct digital control (DDC) system is
 
  A) Not necessary. DDC systems do not use primary controllers
  B) A computer
  C) A multistage thermostat
  D) A relay pack


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AISCAMPING

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Reply #1 on: Jul 27, 2018
Answer to Question 1

B

Answer to Question 2

B


Sufayan.ah

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Reply 2 on: Jul 27, 2018
Thanks for the timely response, appreciate it

shewald78

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Reply 3 on: Yesterday
Excellent

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