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 352 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?

For high blood pressure (hypertension), a new class of drug, called a vasopeptidase blocker (inhibitor), has been developed. It decreases blood pressure by simultaneously dilating the peripheral arteries and increasing the body's loss of salt.

Did you know?

Blastomycosis is often misdiagnosed, resulting in tragic outcomes. It is caused by a fungus living in moist soil, in wooded areas of the United States and Canada. If inhaled, the fungus can cause mild breathing problems that may worsen and cause serious illness and even death.

Did you know?

More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.

Did you know?

Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

Did you know?

Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.

Sexual dimorphism in body size and mating system. Sexual dimorphism in body size and mating system.
Endocrine System Endocrine System
Process Flow Diagram of a Dual-Stage Pressure System Process Flow Diagram of a Dual-Stage Pressure System
Hormonal control of the male reproductive hormones. Hormonal control of the male reproductive hormones.
System of Equations System of Equations
The Muscular System (Anterior View) The Muscular System (Anterior View)
Video: Antidiuretic hormone (vasoconstriction, water reabsorption & sweat inhibition)

For a complete list of videos, visit our video library