Natural & Fan Assisted Appliances

Question 1

What is the difference between an atmospheric burner and a power burner?

Answer 1

Power Burner = fan/ blower brings in air for combustion
Atmospheric Burner = Air is delivered without assistance, uses stack action & atmospheric pressure

Question 2

Fanmix Burner has propellers driven by what?

Answer 2

gas pressure

Question 3

Closed Burner

Answer 3

All combustion air is primary air, sealed firebox.

Question 3

Open Burner

Answer 3

Allows secondary air, ability to burn large quantities of gas

Question 4

Upshot Burner

Answer 4

Vertical Burner Ports

Question 5

Inshot Burner

Answer 5

Horizontal Burner Ports

Question 6

Turndown ratio

Answer 6

Appliances with varying firing rates require different air/fuel ratios

Question 7

What efficiency was standard before appliance were regulated, pre 1970’s?

Answer 7

55%

Question 8

Purpose of a Inducer Fan?

Answer 8

Draw products of combustion through the heat exchanger.

Question 9

What is required standard of efficiency post 1970’s?

Answer 9

78%

Question 10

Steady State Efficiency is what kind of efficiency test?

Answer 10

Taken by an analyzer, snapshot in time

Question 11

AFUE (Annual Fuel Utilization Efficiency) provides what kind of efficiency test?

Answer 11

Overall calculation including seasonal and venting losses.

Question 12

What were some changes made to increase the efficiency of furnaces?

Answer 12

1. Remove the standing pilot
2. re-design the heat exchanger
3. added a vent damper motor
4. included an inducer motor

Question 13

Category 1 have which characteristics

Answer 13

1. Non-Condensing
2. Draft Hood/non-positive
3. mid-efficient
4. Galvanized/ aluminum venting

Question 14

condensing 1 lb of water vapour is how many btu?

Answer 14

970 BTU

Question 15

Typical flue temperature of a high efficient furnace?

Answer 15

90-125 F

Question 16

High efficient furnace is in which category?

Answer 16

4

Question 17

type of venting in category 4

Answer 17

PVC, sealed