CONQUEST 90 - Page 121

18. How many total attempts, or
trials for ignition, does the
furnace control board make
before 100% lock out?
a. one
b. two
c. four
d. ten
19.
The condensate drain trap at
the end of the secondary heat
exchanger should be filled with
water before furnace operation.
a. True
b. False
20.
What is the purpose of the PVC
tee and trap in the combustion
air pipe?
a. To drain water from the
secondary heat exchanger;
b. To drain any water that might
condense and before it can
flow into the furnace;
C.
To minimize the loss of
humidity from the house;
d. None of the above.
21. What is the purpose of the
amber LED on the furnace
control board?
a. To indicate if the furnace
control board has 24 volt
power;
b. To indicate if the control
board has a malfunction:
c. To indicate if the flame
current microamp signal is
sufficient;
d. To indicate if the blower door
switch is fully closed.
22.
What horizontal non-direct vent
termination is used on the
45,000 BTUH upflow furnace?
a. A PVC or ABS tee extending
12 inches out from the wall,
b. A 2" PVC or ABS pipe
extending 12" from the wall,
C. A 2" PVC or ABS coupling
reduced to 1-1/2" pipe and
extending 12" from the wall,
d. A 2" PVC or ABS pipe
extending 12" from the wall
with a 90° elbow turned
down.
23.
What item must be changed on
U.S. installations above 5000
feet elevation?
a.
Natural gas orifices
b. One negative pressure switch
c. The furnace control board
d. The gas valve regulator
spring
24. What can cause excessive vent
gas temperatures?
a. Too much indoor blower air
b.
Too much gas pressure
c.
Low return air temperature
d.
A long furnace run cycle
25. Where is the temperature rise
information listed?
a. On the furnace name (rating)
plate
b.
In the furnace installation
instructions
C.
In this service manual
d. All of the above
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