CONQUEST 80 - Page 124

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20. The current hot surface ignition
control goes into soft lock out if
the induced draft blower does
not close the pressure switch
contacts within 30 seconds of
start up.
a. True
b. False
21.
The "self-healing" feature of the
hot surface ignition control
operates the indoor blower only if
the Heat Assisted Limit Control
(HALC) opens its contacts. This
cools and resets the limit
contacts and prevents lock out.
a. True
b. False
22. Use an Ohmmeter to determine
if a limit switch is open or closed.
A zero Ohm reading indicates an
open limit.
a. True
b. False
23. Over temperature switches
mount just above the burners
and open their contacts to shut
down the furnace if they detect:
a. blocked return air ducts
b. improper heat anticipator
setting
C. lack of combustion air
d. none of the above
24. What is the natural gas orifice
size for use at 1,800 feet
elevation?
a. #55
b. #54
C. #42
d. #43
25 .
What test instrument is used to
measure gas pressure?
a. a Magnehelic Gauge
b. a U-Tube Manometer
c. either A or B
d. neither A nor B
26.
Which of the following is a
possible cause for loss of pilot
flame?
a. incoming gas pressure too
high
b. improper pilot burner hood
location
c. downdrafts in the vent system
d. All of the above
27. Which of the following is a
method to determine if the indoor
air flow is correct?
a. clocking the gas meter
b. measuring the flue gas
temperature
C. measuring the temperature
rise
d.
measuring the incoming line
voltage
28. What is the expected CO
2
% in
the flue gas?
a. 5.0%-6.5%
b. 6.8%-8.0%
C. 8.0%-10.0%
d. None of the above
29.
What is a possible cause for low
CO
2
°/oin the flue gas?
a. Too much combustion air
b. Too little gas pressure
c. Undersized burner orifices
d. All of the above
30. What device is required to
match and properly operate a
Low Profile Gas Furnace with a
heat pump?
a. the RXPF-F01 Fossil Fuel Kit
b. the RXMD-C02 Blower
Delay Kit
c. the RXGP-F01 Twinning Kit
d. All of the above are required
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123