• Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off
Reading...
Front

Card Range To Study

through

image

Play button

image

Play button

image

Progress

1/10

Click to flip

Use LEFT and RIGHT arrow keys to navigate between flashcards;

Use UP and DOWN arrow keys to flip the card;

H to show hint;

A reads text to speech;

10 Cards in this Set

  • Front
  • Back
The four types of gas furnace air flow patterns are_________, ________, _________ and___________
up flow, down flow, low boy and horizontal
Describe the function of a multi poise or multipositional furnace.
Multi poise furnaces can be installed in many positions. Which adds versatility to the furnaces. Multiple safety controls like bimetallic flame rollout or over temperature limits must be designed into the furnace for safety.
Describe the function of a draft safeguard switch.
Vent limit or draft safeguard switches are normally close switches usually mounted on the draft hood on near the exhaust vent pipe exit. They monitor the draft hood temperature and open when there is any spillage of flue gas.
Where are auxiliary limit switches used in heating applications?
Auxiliary limit switches are usually mounted on the warm air blower housing. Down flow furnaces all have auxiliary limit switches. Which sense room return air temperature and interrupt the burner operation when temperature becomes too high.
The specific gravity of natural gas is:

A. 0.08.

B. 1.00.

C. 0.42.

D. 0.60.
D. 0.6
What is a water and digital manometer?
A water manometer is a device that cause a rise in a column of water with a rise in gas pressure. A digital manometer measures gas pressure in inches of water column. It has a digital number and letter display and it is very accurate.
The pressure at the manifold for natural gas is typically:

A. 10 psig.

B. 8in. WC.

C. 5.5 psia.

D. 3.5 in. WC.
D. 3.5 in. WC.
What is the approximate oxygen content of air?
21%
The typical manifold pressure for propane gas is _________in. WC.
10.5 to 11.
Why is excess air supplied to all gas burning appliance burners?
To ensure that there is enough air at all times.