It's the TXV
The TXV’s main job is to control the flow of refrigerant into this component
What is the evaporator coil
The evaporator coil in a refrigerant system is where this happens to the refrigerant
What is refrigerant boils and absorbs heat
What two types of questions do we use to gather information from the customer
What are open-ended and closed-ended questions
This gas is used while brazing to prevent scale and oxidation inside copper lines
What is nitrogen
This board is the “brain” of the Mini split, controlling fans, sensors, and compressor speed.
What is the printed circuit board (PCB)
If a TXV is restricted or stuck closed, this pressure reading will be lower than normal
What is the suction pressure
This term describes the heat required to change a substance from liquid to gas without changing temperature.
What is latent heat
This is the first step of the Service System
What is Prepare
The factory charge is typically based on this length of refrigerant lines.
What is 15 feet (or manufacturer-specified base line length)
This component meters refrigerant electronically instead of using a pressure/temperature spring system.
What is an electronic expansion valve (EEV, TEV)
If a TXV is stuck open, what would our Superheat be?
low superheat
A ton of refrigeration equals how many BTUs per 24 hours
What is 288,000 BTU
This DISC style prefers a methodical, accuracy-based approach
What is the C style
When pulling a vacuum, the system is considered dry when it reaches this threshold or lower.
What is 500 microns
This sensor changes resistance based on temperature and helps the Mini split regulate room conditions.
What is a thermistor
Name the 3 pressures that the TXV works off of
What is Spring, suction, and Sensing Bulb pressure
A high superheat and low subcooling reading indicates this about the refrigerant charge
What is the system is undercharged (starved)
Name all 6 steps of the Service System in order.
What are Prepare, Greet, Explore, Present, Execute, Wrap Up
: This component may be replaced during a refrigerant leak repair to ensure the system stays dry and clean
What is the filter drier
Inverter compressors operate using this type of voltage.
What is DC Voltage
What is the Superheat formula for a Piston?
IWBx3-80-ODA/2
This DISC style is most likely to be resistant to sudden changes and values steadiness
What is the S style
This procedure removes air, moisture, and non-condensable from a sealed system
What is pulling a vacuum
The EEV often operates using this type of motor, which moves the valve in precise steps
What is a stepper motor