By Carter Stanfield, David Skaves, AHRI
Created with a straight forward imaginative and prescient of invaluable wisdom, this groundbreaking textual content presents finished insurance of heating, ventilating, air-con, and refrigeration. Lauded as a reader-friendly textual content that grants basic innovations, the most up-tp-date developments, and functional functions with basic language and assuredly provided thoughts, F undamentals of HVACR, 2d variation boasts conscientiously chosen art and the correct amount of element. This e-book is every thing readers want to know to put in, carrier, and retain HVACR platforms.
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Extra info for Fundamentals of HVACR
All portable ladders must have no-slip feet. 3. Place ladders on a firm footing, no farther out from the wall than one quarter of the height required, as shown in Figure 3-7. 4. Ladders must be tied, blocked, or otherwise secured at the top where the ladder meets the building to prevent them from slipping sideways. UNIT 3 SAFETY 21 3 FEET MINIMUM Figure 3-8 Never use a metal ladder near electrical wires! HEIGHT CAUTION Ladders must be inspected from time to time to ensure their safety. Some companies will require that a company safety official inspect the ladders you carry on your service van.
If the oxygen cylinder valve were to be broken off of a full oxygen cylinder, the cylinder could fly around the room much like a child’s balloon. To prevent possible damage to the valves and regulators on oxygen and acetylene cylinders, the cylinders should be securely attached to a frame or cart when they are in use (Figure 3-13). CAUTION Certain materials react explosively if exposed to highpressure pure oxygen. Never use oil or grease on any part of the oxygen or acetylene regulator, hoses, or torch and tips.
Ensure that all fittings are clean and dry when assembling. Repair using only manufacturer-approved replacement parts. Air acetylene torches are used by HVACR technicians to produce sufficient heat for silver (hard) soldering brazing. These torches use a mixture of air and acetylene as a fuel. Oxyacetylene torches are used for brazing, welding, and cutting. These torches mix oxygen and acetylene gases to produce a very intense, hot flame. The following safety rules should be practiced when using this equipment.