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  • A stumper for the HVAC technicians?

    Maintenance & Repairs - 5 hours ago

    Additional Details

    So I'm in an HVAC class. My lab was a unit change out. Everything was going smooth and easy, until I tried to raise the head pressure to 278 psig. The first time I got my head pressure up around 278 psig. While measuring my subcool(which was fluttering around 20 degrees) the high pressure switch cut out. After that It cut out at around 160psig. I bypassed the hi/lo pressure switches, because they kept tripping, and raised head pressure to 200 psig. Above that and the compressor cuts out while the condenser fan keeps blowing. I weighed in the charge of 5.8 lbs of R-22, like the label on the unit called for, if anything it is overcharged. I pulled a triple evac. It is not on me yet to troubleshoot this unit, but I hate failure. This one has two of my instructors suspecting different causes; bad compressor or undercharge. Any ideas? To raise the head pressure, we wrap the coils with plastic and limit airflow. I say it is overcharged because 5.8 lbs is a complete charge with 25' of lineset. This unit has approximately 19' of lineset. The evap coil was not replaced with the condenser. The TXV works fine, it maintains 10 degrees superheat. I think I got everything. The filter drier is just a standard issue. About the size of an orange. The sight glass has a few stray bubbles, which I have received mixed information on. A short time instructor said a proper charge should show no bubbles, another instructor said a proper charge would show some bubbles. The subcool number does show an undercharge...either a coolant loss or I had the scale set to kilos? I think it was a potential relay. All those little black boxes look the same, and I could not see the wiring diagram without removing it from the unit. discharge temp. was around 85-110, the higher number with higher pressure. hermetic, scroll, 208 volt, high temp, used residential unit. We have dozens of A/C's, I swapped out a 13 SEER unit for an antique 12 SEER Rheem. I don't remember the amp draw, but it did increase as pressure rose. This problem developed near the end of the day. So we didn't have time to start troubleshooting. School is closed till Monday, but I have been pondering this since last night. From the questions you have led me with, I tend to suspect the compressor. The compressor was extremely hot to the touch. I think it was a potential relay. I could not read the schematic on it. I admit I am a rookie with no practical field experience. evap pressure stays steady at 70 psig. The pressure rises to around 80 psig when head pressure is forced up to 200 psig.
  • need help with upholstery fabric?? advice?

    Decorating & Remodeling - 9 hours ago

    Additional Details

    I'm buying fabric for my couches and I wanted to know if a blend of wool and polyester would be a good fabric.. I want something that is colour durable, easy to clean and would last a long time.. OH and something that wont lint up when i put it in the wash.. if anyone knows of such fabric please let me know.. thanks in advance
  • Drywalling question(gaps and jagged sheetrock).?

    Do It Yourself (DIY) - 10 hours ago

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    I'm not sure if I make sense to you, this is hard to explain. Basically there is a hole or groove about a inch deep in the sheetrock where he failed to snap the board clean. The grove is located in the middle on the ending. Now when I tape over this I can sorta see that I'm taping over a hole in a wall. I feel like this is not the proper way to do it and it can easy be "punched" through later on. What can I do to fix this gap so I can tape over something solider and the paste?
  • How do I clean my UGG's?

    Cleaning & Laundry - 12 hours ago

    Additional Details

    I always wear them without socks because they are so warm and fluffy inside so Im thinking I should clean them, can they go in the washing machine and the dryer?
  • my new home has a fab laundry room,need some ideas ,i wanna it to be really nice.?

    Decorating & Remodeling - 14 hours ago

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  • Can I let carpet deodorizer sit overnight?

    Cleaning & Laundry - 14 hours ago

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  • I have always fancied myself as gardener but now my wife wants me to plant bulbs. Never planted bulbs before.?

    Garden & Landscape - 14 hours ago

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    Do I have to plant them in the fall, like now, or can they be planted in the spring. Tulips etc...etc.
  • framing metal studs and drywall?

    Decorating & Remodeling - 16 hours ago

    Additional Details

    someone knows who is hiring.i do framing metal stud,drywall,& T bar suspended ceiling and also i have my own laser for T bar ceiling i have more than 10 years experience i am available in east wenatche wash. thanks
  • What is the best time of the year to trim Burning Bush hedges?

    Garden & Landscape - 16 hours ago

    Additional Details

    I always thought you were supposed to trim them in springtime, but right now those little spindly branches with no leaves on them look pretty easy to trim to the height I want them at ......
  • How do I get these trip switches on again?

    Do It Yourself (DIY) - 16 hours ago

    Additional Details

    Hi. I was at work and, in a fit of utter stupidity, I went to the swtichboard and flicked some of the trip switches off. Now they won't switch back on again. I tried to switch them on and they just kept going back to off. Please help before anyone notices that nothing is working. Is there an easy way to get them back on again? I don't want to get the sack. I think I might just pretend it was a storm that did it. But I don't know if I can get away with it. Please help! I think the switches are right over into the off position already but I'll check. I think I have to call in the electricians and pay for them to fix it (in the middle of the night), because if the company can't function due to a strange lack of electricity then it will cause a lot of problems and then people will get angry and I will have to hide in the cupboards again. And I don't want to do that because it's very uncomfortable after the first few hours.

Buying Eco-Friendly Cleaners

What to look for when choosing green products ...

By Martha Li
Buying Eco-Friendly Cleaners
There are a lot of green cleaning products that make hefty claims about being safe for the environment—but can they be trusted? Follow these guidelines when buying green cleaning products to ensure they are truly environmentally friendly.

Watch out for toxic ingredients. Avoid products that contain chlorine bleach and ammonia, two ingredients that contain high and acute levels of toxicity. The fumes produced by these ingredients become an irritant to the eyes, nose, throat and lungs. If combined together, these two chemicals pose an additional threat because they react with each other to form lung-damaging gases. It’s also best to avoid cleaners with labels such as "Danger" or "Poison" as these are tell-tale signs that the product is corrosive or may cause burns or other harmful effects to your health.

Avoid phosphates. Phosphates are minerals that can soften water, but they also act as fertilizers. When cleaning products containing phosphates go down the drain and are discharged into bodies of water, particularly into lakes and rivers, the phosphates cause pollution of the water due to a rapid growth of algae.

Buy products made of plant-based ingredients.
The key ingredients in most cleaners are known as surfactants, which are the detergents themselves. Surfactants contained in many cleaning products are petroleum-based, though there is a growing trend towards using ingredients made from coconut or other vegetable oils. The environmental benefit of cleaning products made of vegetable oils is that these surfactants are renewable resources, whereas petroleum is a non-renewable resource that causes pollution during the extraction and refining process.

Check the degree of biodegradability.
Most substances contained in cleaning products will eventually break down; so the “biodegradable” mention on the label may not mean anything at all. Instead, look for products that have a more specific claim, such as "biodegradable within 21 days". It’s also important to note that surfactants made from plant-based oils are not necessarily more biodegradable than those made from petroleum.

Avoid products containing nonylphenol ethoxylate. This is a petroleum-based surfactant that has poor biodegradability. Unfortunately, even when used, this ingredient is rarely ever disclosed on the label. If you do see it listed, however, definitely avoid using the product. In addition to its poor biodegradable quality, this type of surfactant is believed to have harmful effects on fish and other wildlife.

Verify if the product has been regulated. Be skeptical of products that give vague claims such as "non-toxic", “environmentally-friendly” or “ecologically-safe”. These terms hardly mean anything if not backed up by an environmental governing body. Short of being a scientist in a lab, the main thing to look for is not only statements such as “biodegradable” and “non-toxic” but also if the product has been certified by a third party such as the EcoLogoM Program or the Design for the Environment Program (DfE) by the U.S. Environmental Protection Agency, which has specific requirements that need to be met.

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1 Comment

  • 1. Posted by Jill The Reckless on Tue, May 12, 2009

    This article is very helpful. I have been trying to find out whether "plant-based" surfactants are really less harmful than those made from petroleum bi-products. I have found the information provided by 'natural' product manufacturers very vague. It is helpful that you point out that a certification from a third party would be significant. Thanks.

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