CHOWS UNIT 4 Flashcards
(49 cards)
What are some of the things you should be looking out for in regards to personal safety when going to a job site?
Wet areas
Hazardous chemicals
Electrical sparks
Heavy equipment that could jeopardize your safety
Holes
How fast will a GFCI trip?
1/40 of a second
You and your partner, Daniel are working on a chiller in the basement of the building. He goes to check the cooling tower timer. While you take pressures and temperatures on the chiller. All of a sudden you hear and feel a loud rush of pressure in the machine room, you are in, You notice a white vapor is being released from a relief valve on the chiller into the machine room you are in. What should you do?
Grab Daniel and tell him let’s get out of here. A machine can be replaced, but a life cannot. Since refrigerant is denser than air, displacement will occur in a person can easily pass out and die.
Vincent and Mason are working at Payless shoes. I need to get to the roof to work on a package unit. How should they set up their ladder if the rooftop is 18 feet high? Explain what they should do to prep for rooftop work..
The ladder should be 3 feet above the rooftop and 1/4 distance from building
Set up a pulley system to bring equipment up and down from the roof
Inspect the roof for wet spots and anything that could be a potential safety risk
Have on proper PPE before going onto the roof
Always be aware of your surroundings
While doing preventative maintenance in the basement at Hilton Hawaiian Village, while checking pressures on the rack as you crack the king valve with your service wrench, it starts to leak shooting liquid all over your probes and hands. What should you do?
Stay calm and close the valves
The alternative method would be to leave the area and inform everyone you can .
Play hazard signs and Blinky lights if possible to keep people from going into the area .
If the refrigerant hadn’t touched my hands, I’d probably attempt to position the valve back to its original setting .
Because my hand came in with the refrigerant I would go to the hospital as soon as possible .
Kaipo is being sent to clean a greased out air conditioning condenser coil on the roof with no roof access. what safety precautions should be taken before using chemicals to clean the condenser.
Make sure that he is the proper ladder and extension to access rooftop
Proper protective equipment, such as goggles, face, mask, gloves, steel toe, boots, and pants
Make sure your system is not arching
Lockout tag out
Make sure a wash station is close by
Inspect the rooftop for anything hazardous, including wet spots
Billy is reporting to a high-rise job today to hang fan coil units and rough in pipe. What type of PPE should he show up with on this job site?
Long pants
Long sleeve shirt
Face mask
A tarp or something to place under the working area to help with cleanup
Gloves
Hardhat
When doing a crane lift what should you do to the unit to help you stabilize and guide the load?
Utilize a tagline
Ensure that the unit is snuggly strap down with no loose ends
If possible, keep unit in a wooden crate that is nailed shut
Jason needs to replace a large screw compressor today located inside of a target. What should he bring to replace the compressor that is sitting on a stand 3 feet high off the ground? And then needs to move the compressor from the machine room on the second floor to a flatbed on the first floor. What is needed?
A crank jack will assist in bringing him down the compressor that is 3 feet high off the ground
A pallet jack with a pallet to place compressor on could come in handy
Gloves
A helper
New compressor
Lifting belt
Ratcheting tool set
Face mask in case there is a compressor burn out
Unistrut
When soldering pipe on a heat pump located above a pole ceiling to replace a TXV, name some ways you can protect components and prevent unit from catching on fire while working inside of the drop ceiling.
A heat shield can prevent components from catching fire
Have an open port suppress has an escape route
Wet rags
Air circulation
How hot is an electrical arc?
An electrical art can be four times hotter than the suns surface. 35,000°F.
What are some good practices to prevent electrical shock when working on HVAC equipment?
Don’t work on energized systems in the rain
Wear proper protective equipment
When checking/resetting breaker, use only one hand with both probes in it while the other hand is behind your back
Lockout tag out
Stirling is being sent to Sprint to replace a line starter located in a 12 foot ceiling in a backstock room area for a fan coil unit. How can he safely do this job? This procedures and equipment needed to get them set up.
Lockout tag out
Set up working area with cones or signs to let people know something is happening over here
Proper protective equipment and tools
A portable fan for ventilation
A 20 foot ladder just to be safe no less than 15 foot ladder
Pump down an isolate component for change out
Battery operated drill
Gloves, face mask
Cell phone
What is the code book referred to for electrical safety in the United States?
National electrical safety code or NFPA-70E
What is an “Arc Flash”?
An arc flash is a type of electrical explosion that occurs when an electrical current passes through the air between ungrounded conductors or between a conductor and ground.
What can cause An arc flash in the field?
Faulty equipment
Improper maintenance
Non-insulated probes that are being used on a system with moisture in the air
Having a shorted ground wire (short to ground)
Corrosion
What can stop an arc flash?
Circuit breaker
Fast acting fuse
Deenergize the system
GFCI
Properly rated cat 3 / cat 4 tools
Why listen to the voice in your head?
Because it is warning you that something is not right. That little voice in your head could be the determining factor if you make it back home or not. If it doesn’t look safe, don’t do it.
When transferring refrigerant from a cylinder to a refrigeration system or any other container, you should always wear……
Goggles with a side shields and gloves
A fusible plug is a metal fitting that has a hole drilled through it, and the hole is filled with……..
Material with a low melting point
When it is necessary to perform electrical work in an area that has a damp or wet floor, which of the following can be done to minimize the chance of electrical shock?
Wear insulated boots and gloves
Place a rubber mat on the floor
Use a fiber ladder
An electrical circuits, the……. Wire protects the operator.
Grounding
Fires that involve ordinary materials, such as paper, cardboard and wood are classified as type……
A
A cylinder with 1500 in.² of internal surface contains R-22 and is in a service truck body at 120°F. What is the total outward force of the refrigerant against the inner wall of the cylinder in tons of pressure?
194.92 tons
