Chad Test Flashcards
Start cap % and is it voltage or amps
130% and it’s voltage
Potential relay switches on?
Voltage, back emf
Current relays, wire gauge? Series of parallel? And do they have many turns
Thick gauge wire, in series and have many turns
Run cap % and are they voltage or amperage
110% and voltage
How are micro fared added in parallel?
1/1+1/2+1/3
Potential relay, Line gauge? Many turns? Series or parallel
Light gauge, many turns and parallel
Compressor discharge 6” off discharge max heat
107 degrees C
What terminals energize defrost solenoid on a time clock
3@X
What terminates a defrost time clock
Time set and evaporator at 55F
How to add micro fareds
1+2+3
Adding microfarads is opposite of resistors?
YES
If oil pressure control lines are hooked up backwards what will the compressor do
It will run for a short period of time than shut off
Why would you want a cover on the oil safety control?
With cold ambient temperature it might not shut off
What type of unloaded, is it called even it bypasses the piston,
Electrical unloading not mechanical
What 2 compressors are eccentric?
Scroll and rotary
What 2 compressors are Concentric?
Reciprocating and screw
Are PSC and CSCR the same
Yes
What 2 single phase motors start coils are removed after 75% rotation?
CSIR AND RSIR
How long do you let the crank case heater on a RTU warm up before a first start up?
24 Hours
Does an accumulator stop a flooded start on a compressor?
NO!
Pilot valve purpose
Minimize size of valve operator
Super heat divided by 1.8
Yes
Operating superheat of thermostatic expansion valve
Sum of the static and opening superheat (valve gradient)
System installed with pressure limiting txv what accessory can’t be used
CPR
3 txv charges that have a mop
Gas, gas cross charge, and hydraulic
