問題一覧
1
How do you pinch a flue pipe
upward pitch
2
What type of pipe is bi vent
double wall pipe
3
Identify the switches
temperature switch on rise and pressure switch open on the rise capacitor coil transformer
4
A component that appears in the 70 furnace but not a 90% furnace
draft diverter
5
What two pipes does a 90% efficiently furnace have
intake pipe exhaust pipe
6
Is low-voltage such as 24V consider central voltage TRUE OR FLASE
true
7
What does the flue pipe Connect to
chimney or outside
8
A heat anticipator can be adjusted to prevent
thermostat overshoot
9
Another term for exhaust
flue pipe
10
The part under the thermostat cover
The subbase
11
What are the components of a fan center?
relay transformer junction box
12
Which of the following three is? Measurement current flow
amps
13
N/A
N/a
14
N/a
n/a
15
Does a fan switch open or close when the furnace is hot
Close when it’s hot open when it’s cool down
16
What are the components gas flows through?
gas valve manifold spud burner
17
Four components required for a furnace
limit switch thermostat fan switch Contactor
18
What is the Y wire?
blue for cooling
19
What causes the open rollout switch
crack in the heat exchanger
20
On a 90% furnace which portion of the exhaust gases condense
secondary heat exchanger
21
What is the limit Switch used for
to prevent extensive heat
22
What does a 90% furnace require for condensation?
collector box and drain line
23
What kind of limit switch it’s inside a blower motor
auxiliary limit switch
24
12 or red wire 24v is connected to what
transformer secondary
25
Which component forces air thought the heat exchanger inside the venting
induced draft fan
26
N/a
N/a
27
What is the rollout switch for?
release heat out the heat exchanger
28
What does IFC control
Fan and ignition controls
29
Where does combustion take place on a 90%?
Primary heat exchanger
30
An induced draft fan would be on a 70% furnace true or false
False
31
What type of furnace produce water
90% or plus
32
Where is a vent safety switch located on a 70% furnace
draft diverter
33
What would the jumper wire in the com/fan be removed
The jumper will be removed when wire to 24 V
34
A device that Can reduce capacity of induced draft fan on a smaller furnace
restrictor plate
35
Can a fan realy control a blower motor
yes a relay can as well as a fan relay IFC
36
What material should the venting of a 70% furnace be made of
metal single wall
37
A transformer that uses 120v in the primary and 24v in secondary
step down transformer
38
3 types of furnaces
upflow downflow horizontal
39
To adjust the speed on a Direct drive blower what device will be adjusted?
relay