1
2
3
4
5
100
What is electrical voltage phase?
# of currents in a voltage cylce
100
What are the blower maintenance checks
Running Amps on blower fan motor
Check for heat on back of motor
Check for leaking oil
Check for horizontal play in the blower shaft
100
What are the relay ratings?
# of Poles
# of Throws
100
Amps=
Work being done
100
What two positions are switches usually designed in?
Normally Open
Normally Closed
200
limit switch
200
What is the difference between the x-13 motor and the variable speed fan motor
The variable speed motor has several rows of terminals, 1 row of 4-6 terminals and 1 row of 12-18 terminals. A x-13 motor has 2 rows of 4-6 terminals per row.
200
What are the two types of wiring diagrams?
Pictoral
Ladder
200
How do you calculate target Superheat for a system with a fixed orifice metering device?
(IWBx3-80-ODT)/2
200
What is the difference between a relay and a contactor?
A contactor can handle more Amps
300
What are the two parts on an A/C motor
Stator
Rotor
300
On PSC motors what happens when resistance is increased
The motor slows down
300
What is the standard frequency in the US
60 HZ
300
What are the terminals on the load side of the system labeled as?
T1,T2
300
Volts=
Pressure
400
What are the 3 types of windings in A/C motors?
Common winding
Start winding
Run winding
400
What 2 checks need to be made on a contactor?
Voltage Drop
Visual Inspection
400
What is Air Conditioning?
The process of controlling the temperature, humidity, cleanliness, and distribution of air within a structure
400
What are the 3 pressures on a TXV metering device?
Suction
Spring
Sensing Bulb
400
What is Heat
Energy that causes the movement of molecules within a substance
500
what are the ratings on a contactor and what do they measure?
Vac- Volts
FLA- Full Load Amps- Running Amps on a fan motor
LRA- Locked Rotor Amps- Startup Amps on a compressor
RES- Running Amps for resistive loads
500
What color wire is a 24v common?
Blue (or any other color)
500
How is superheat affected on a system with a Low Load on the Condenser?
Superheat is not affected
500
What is the incoming voltage into the transformer called?
Primary Voltage
500
What is subcooling?
Heat removed from a liquid below its saturation temperature