Transcript G1 Supplemental Questions

G1
Supplemental
Questions
Question 1
What type of single phase motors are used for the
compressor, outdoor fan motor and indoor fan
motor? Move onto the next slide to determine your
answer.
What’s your answer?
Compressor motor – PSC
Outdoor fan motor – PSC
Indoor fan motor – Shaded Pole
Question 2
Does the compressor have an overload, and if so, is
it internal or external? Move onto the next slide to
determine your answer.
What’s your answer?
Internal
Question 3
Whose
identification
code
is
used
with
the
thermostat? Move onto the next slide to determine
your answer.
What’s your answer?
ITT
This is a very old schematic since ITT’s ID code has
not been used for many years now.
Question 4
The contactor for the compressor and outdoor fan
motor is identified with __________ letter.
onto the next slide to determine your answer.
Move
What’s your answer?
M
Question 5
What is the purpose of the blue/yellow wire tap on
the transformer primary? Move onto the next slide
to determine your answer.
What’s your answer?
The tap is so that this transformer can be used on
either 208 or 230 volts. Red to Yellow/Blue is for
208v and Red to Black is for 230v.
This supply
voltage for this equipment is 230v, so noted,
therefore the schematic shows L1 and L2 connected
to Red and Black. Check it out.
Question 6
What is the rectangle in the ‘yellow’ wire of the low
voltage circuit, and which wire is it found in? Move
onto the next slide to determine your answer.
What’s your answer?
The rectangle is a ‘fuse.’ A rectangle can be used as
a symbol for a fuse.
The wire that the fuse is found in is the ‘common’
wire of the transformer. Many times when a fuse is
used on the low voltage circuit, it is found on the
‘return’ or ‘common’ side of the circuit.
Question 7
Notice the IFR in the low voltage circuit. It has a
number 1 to the left and a number 3 to the right of
the coil. What do these numbers represent? Move
onto the next slide to determine your answer.
What’s your answer?
Since the numbers are right where the ‘dots’ are,
they indicate wire connection points. The numbers
represent the ID code on the relay for the coil.
Question 8
To the left of the IFR coil there are numbers 7 and 6.
What do these numbers represent? Move onto the
next slide to determine your answer.
What’s your answer?
Since the numbers are NOT where the ‘dots’ are,
they indicate actual wires.
The numbers represent
the ID code on the wire. We don’t usually see this
on schematics. This is done at the factory. The folks
on the production line use this type of diagram to
wire the equipment.
Question 9
Likewise, to the left of the ‘M’ coil there are numbers.
What do these numbers represent? Move onto the
next slide to determine your answer.
What’s your answer?
Since the numbers are NOT where the ‘dots’ are,
they indicate actual wires.
The numbers represent
the ID code on the wire. We don’t usually see this
on schematics. This is done at the factory. The folks
on the production line use this type of diagram to
wire the equipment.
Question 10
What is the switching action of the IFR? Move onto
the next slide to determine your answer.
What’s your answer?
I hope you answered SPST –NO.
Question 11
What is the switching action of the ‘M’ contactor?
Move onto the next slide to determine your answer.
What’s your answer?
I hope you answered DPST.
Question 12
What is the source voltage, frequency and phase?
Move onto the next slide to determine your answer.
What’s your answer?
You should have answered:
120v, 60Hz, 1 Phase
Question 13
What do the ‘M’ letter designations L1, L2, T1 and T2
represent? Move onto the next slide to determine
your answer.
What’s your answer?
L1 and L2 represent the power coming in (source)
connections.
T1 and T2 represent the power going out to the
‘load.’