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 203 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?

If you use artificial sweeteners, such as cyclamates, your eyes may be more sensitive to light. Other factors that will make your eyes more sensitive to light include use of antibiotics, oral contraceptives, hypertension medications, diuretics, and antidiabetic medications.

Did you know?

Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.

Did you know?

Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.

Did you know?

In inpatient settings, adverse drug events account for an estimated one in three of all hospital adverse events. They affect approximately 2 million hospital stays every year, and prolong hospital stays by between one and five days.

Did you know?

HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.

Divisions of the nervous system. Divisions of the nervous system.
Feedback control of the adrenal cortex Feedback control of the adrenal cortex
Block Diagram of Single-stage Pressure System for Dual-Stage Pressure Production of Nitric Acid Block Diagram of Single-stage Pressure System for Dual-Stage Pressure Production of Nitric Acid
Male Reproductive System - Semen Male Reproductive System - Semen
Overview of the Digestive System Overview of the Digestive System
Respiratory system of a bird. Respiratory system of a bird.
Video: Introduction to Human Immunodeficiency Virus (HIV)

For a complete list of videos, visit our video library