This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: How many wires are needed for a communicating control system to control a three-stage heat, ... (Read 351 times)

lbcchick

  • Hero Member
  • *****
  • Posts: 550
on: Jul 24, 2018
How many wires are needed for a communicating control system to control a three-stage heat, two-stage cool heat pump?
 
  A) Four wirestwo for power and two for communication
  B) Nine wiresone for each stage plus reversing valve and power
  C) Five wiresone for each stage heat and cool
  D) No wires are required because communicating systems are wireless.

Question 2

What does a roll-out switch do?
 
  A) It shuts off the gas valve if flames are sensed outside the combustion area.
  B) It allows the combustion components to be rolled out of the combustion chamber.
  C) It ensures proper clearance between the furnace and nearby walls.
  D) It checks to make sure the blower has not rolled out of position on the unit.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

macmac

  • Sr. Member
  • ****
  • Posts: 343
Reply #1 on: Jul 24, 2018
Answer to Question 1

A

Answer to Question 2

A


lbcchick

  • Hero Member
  • *****
  • Posts: 550
Reply #2 on: Jul 24, 2018
Thanks


macmac

  • Sr. Member
  • ****
  • Posts: 343
Reply #3 on: Jul 24, 2018
Welcome :)


« previous next »
 

Did you know?

The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

Did you know?

When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).

Did you know?

In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.

Did you know?

One way to reduce acid reflux is to lose two or three pounds. Most people lose weight in the belly area first when they increase exercise, meaning that heartburn can be reduced quickly by this method.

Did you know?

A serious new warning has been established for pregnant women against taking ACE inhibitors during pregnancy. In the study, the risk of major birth defects in children whose mothers took ACE inhibitors during the first trimester was nearly three times higher than in children whose mothers didn't take ACE inhibitors. Physicians can prescribe alternative medications for pregnant women who have symptoms of high blood pressure.

Ivanpah Solar Electric Generating System Ivanpah Solar Electric Generating System
Disorders of or Associated with the Lymphatic System Cont Disorders of or Associated with the Lymphatic System Cont
Procedures and Diagnostic Tests Related to the Integumentary System Procedures and Diagnostic Tests Related to the Integumentary System
The digestive system. The digestive system.
Most stepper motors use four wires, which are pulsed by the computer to rotate the armature in ... Most stepper motors use four wires, which are pulsed by the computer to rotate the armature in ...
Instruct recipient on giving you feedback immediately if heat becomes too intense. Remind the person ... Instruct recipient on giving you feedback immediately if heat becomes too intense. Remind the person ...
Video: Genetic distance between human groups

For a complete list of videos, visit our video library