Refrigeration
Name the two types of metering devices
Fixed orifice (Piston)
Modulating (TXV)
It takes _ btu to raise _ lb of water _° F
1, 1, 1
Before disconnecting High and Low voltage wires, check for ____
Voltage/Power
BTU
(Write the word on the board)
British Thermal Unit
A four-size, square shank tool, used to open and close the equipment’s service valves
Service valve wrench
What does a compressor do?
Moves refrigerant
Vapor only
Low to high
What is the tonage of a 42000 btu ac
3.5 ton
As temperature in an object increases, the pressure __?
Increases
An HVAC system that uses two different types of fuel.
Dual fuel
A tool that can be used to expand the end of a tube so to create a female fitting.
Swage tool
Refrigerant is in what state between the evaporator and the compressor
Low pressure vapor
How many btus in a 4.5 ton system?
54,000 btus
Free points
oh yeah
PSIG
Pound per Square Inch Gauge
Name 5 brands of HVAC units
Trane, Carrier, Lennox, Rheem, Goodman, Amana, Rudd, Bosch, York, American Standard
The condenser changes the refrigerant from a High pressure Vapor to a ___ pressure ___.
High pressure Liquid
Ice absorbs __ Btus of heat to change 1 lb of ice to 1 lb of water @ 32 degrees (Just a change of state)
144
Describe any form of 3H/2C equipment
answers vary
DSH is an abbreviation for
Discharge Superheat
Name all the tools needed to recover refrigerant
Gauges, Recovery tank, Recovery machine, Scale
Many people have contributed to the invention of the refrigerator, including William Cullen, Jacob Perkins, Carl von Linde, Fred W. Wolf, and ____.
Albert Einstein
All objects contain heat until it reaches absolute zero, -__° Fahrenheit?
absolute zero or -460 Fahrenheit
______ was the first President to enjoy air conditioning in the White House. He spent $30,000 to install the system in the oval office, just after the start of the Great Depression.
Herbert Hoover
2nd Law of ____?
Heat travels from hot to cool
(Write the word on the board)
Thermodynamics
What year was the first modern air conditioner introduced?
1902