Natural and Fan-Assisted Draft Appliances - Part B Flashcards
What are the 2 methods used to describe the efficiency of gas fired appliances?
- annual fuel utilization efficiency (AFUE)
- steady state combustion efficiency
AFUE is used to describe what?
AFUE is used to describe the overall seasonal efficiency of an appliance and will take into account losses through the venting system
What must be completed before any start up procedure?
Testing and purging of the gas supply piping
What type of efficiency is used to describe the overall efficiency of an appliance?
Annual fuel utilization efficiency
Boilers converted to gas must have the following minimum clearances to combustibles…
Top 18”
Sides and Rear 18”
Front 48”
Forced air furnaces converted to gas must have the following minimum clearances to combustibles…
Top 1”
Sides and Rear 6”
Front 24”
Gravity furnaces converted to gas must have the following minimum clearances to combustibles…
Top 6”
Sides and rear 6”
Front 24”
A gravity furnace must be equipped with a high temperature limit control with a maximum setting of?
350°F
A forced air furnace must be equipped with a high temperature limit control with a maximum setting of?
250°F
