HVAC Unit 31 Gas Heat Review Questions with answers

HVAC Unit 31 Gas Heat Review Questions with answers
Question :The four types of gas furnace air flow patterns are
_____, ______, _______ and _______.
Correct answer:Upflow, low-boy, downflow, and horizontal.
pg 711-712
Question :Describe the function of a multipoise or
multipositional furnace.
Correct answer:It can be installed in any position. It is very
versatile. The configuration can be changed very easy. pg 712
Question :Describe the function of a draft safeguard switch.
Correct answer:Also known as a vent limit switch. They are
NC switches usually mountd on the draft hood if the furnace
has one. They monitor the draft hood temperature and open
when there is any spillage of flue gas. pg 713
Question :Where are auxiliary limit switches used in heating
applications?
Correct answer:They are used for counterflow and horizontal
furnaces. They monitor room return air temperature and
interrupt burner operation when the temperature gets too hot.
pg 713

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