Programming Control

Question 1

Referring to the figure below, does the fuel train require an overtravel proof of closure switch?

Answer 1

No - pilot fuel train 7.1.6

Question 2

At what percentage of input is considered to be maximum for low fire start position when the burner input is in excess of 1,000,000 Btus?

Answer 2

40%

Question 3

What is the maximum trial for ignition period of an intermittent or interrupted pilot flame?

Answer 3

10 Seconds

Question 4

What is the maximum trial-for-ignition period of a main burner flame from an intermittent or interrupted pilot flame?

Answer 4

10 Seconds

Question 5

When is a pre-purge required for a burner?

Answer 5

When the combustion supply is by mechanical means and an intermittent pilot is used.

Question 6

When is a proven low fire start required for a gas fired appliance?

Answer 6

When the appliance input is in excess of 1,000 MBH

Question 7

When a purge timer is used it shall provide a means of adjustment for proper setting in the field?

Answer 7

False

Question 8

Referring to the Fireye E110 control manual, where would the combustion air switch be wired on the sub-base?

Answer 8

3-P

Question 9

Referring to the Fireye E110 control manual, what terminals must make to drive the firing rate motor to high fire?

Answer 9

10-X

Question 10

Referring to the Fireye E110 control manual, which terminals need to be made to to prove low fire start position?

Answer 10

M-D

Question 11

Referring to the Fireye E110 control manual, which terminals need to be made to start the high fire purge?

Answer 11

D-8

Question 12

Referring to the Honeywell 7895 control manual, what is the operation sequence of the ignition transformer and pilot system of the 7895A 1048 control?

Answer 12

Interrupted ignition / intermittent pilot

Question 13

Referring to the Honeywell 7895 control manual, where would the combustion air switch be wired on the sub-base?

Answer 13

6-7

Question 14

Referring to the Honeywell 7895 control manual, what needs to be done to the 7895A control to ensure lockout on failure of the combustion air proving switch (CAPS)?

Answer 14

Remove jumper JR3

Question 15

Referring to the Honeywell 7895 control manual, what will happen if a jumper is clipped and removed after 200 hours of operation?

Answer 15

It will cause a non-resettable fault 110, and the relay module must then be replaced

Question 16

If during the run cycle of a 7895 controller, the operating aqua stat’s contacts remain closed and the high limit Aquastat contacts have opened, what is the expected outcome?

Answer 16

The appliance will restart once the high limit is reset

Question 17

What is the approximate pre-purge time in seconds required for a 78% efficient boiler with an input of 11,456 MBH running at 23% excess air and has a total internal flue volume (including heat exchanger and flue passages) of 133 ft3?

Answer 17

14 seconds

Question 18

What is the approximate pre-purge time for pre-purge for a 5,000,000 Btu appliance with a forced draft burner that is operating on a 45% propane and 55% air mix, the excess air set at 30%, and the Combustion chamber and flue passages total 50 ft3?

Answer 18

11 seconds

Question 19

Calculate the approximate pre-purge time for a steam boiler using the following information:

• Rating: 645 Boiler Horsepower
• Efficiency: 81%
• Fuel: CH4
• Calorific value of fuel: 1,099 Btu/ft3
• Excess air: 21%
• Water capacity: 1,242 U.S. gallons
• Shell length: 153 inches
• Internal Diameter: 74 inches

Answer 19

11 seconds

Question 20

How many air changes of the combustion chamber and flue passages are required for a pre-purge of a gas fired appliance?

Answer 20

4 air changes