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  1. Replies
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    Dave. Start a thread in the proís commercial...

    Dave. Start a thread in the proís commercial forum, we can get more in depth with technical assistance there. In the open forums, you wonít see in depth combustion assistance.
  2. So youíve changed it to MO99, and are now having...

    So youíve changed it to MO99, and are now having these issues? It was OK on R22?

    You may be seeing why Trane said you canít convert it......
  3. Best course of action is to first contact the...

    Best course of action is to first contact the manufacturer for their recommendations. These days, they all have a stance on conversion.

    What brand and model unit do you have?
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    If he does that, get him to hang a tag on the...

    If he does that, get him to hang a tag on the cores explaining that they have filters, but need changed before returning to service.

    Itís irritating going on jobs and finding things bypassed or...
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    LOL! Yeah man, I work on anything and...

    LOL! Yeah man, I work on anything and everything....and make no promises on any of it!

    I see stuff every day that I donít know what it is, just gotta keep on keepin on!!
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    the red one looks like a regulator of some kind...

    the red one looks like a regulator of some kind and the other a filter, strainer, or solids separator.
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    you should be able to use tapatalk to attach an...

    you should be able to use tapatalk to attach an image directly from your phone.
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    well, that was entertaining....just learned more...

    well, that was entertaining....just learned more about the history of sewer systems than I ever wanted to! LOL!

    Doesn't look like that company is in business anymore.....unless they've changed...
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    Do the carriers have the Dual coils? The waxy...

    Do the carriers have the Dual coils?

    The waxy buildup in the Tranes is caused by high discharge temps...which is based on. High tremps. Caused by lack of proper coil cleaning!
  10. OP is referring to moisture removal from the air...

    OP is referring to moisture removal from the air side (dehumidification), not evacuating a system for refrigerant charging.
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    OP said guy was a new tech, so I could easily...

    OP said guy was a new tech, so I could easily see:

    TXVís are better than fixed orifice, and why pay OEM? a compressor is a compressor!

    Bottom line, thatís a screwed up mess. I feel sorry for...
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    Ok, so lets do it right. Size the TXV for the...

    Ok, so lets do it right.

    Size the TXV for the unit tonnage at the rated capacity. Size the orifice for the unit capacity. Size the the distribution nozzle and distribution tubes for the the...
  13. Thread: York Heat Pump

    by 71CHOPS
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    The space sensor failure popped up on all the...

    The space sensor failure popped up on all the newer ones a few years ago, factory always said not to worry about it.

    Which economizer controller does it have? May just be a configuration setting...
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    Yeah some of them had a NO and NC contact set on...

    Yeah some of them had a NO and NC contact set on the pressure switch. Would have to see a wiring diagram, but should be easy to bypass.
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    Uhhhmmmm.......yeaahh........

    Uhhhmmmm.......yeaahh........
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    22* discharge SH is low for a scroll compressor. ...

    22* discharge SH is low for a scroll compressor.

    Recover charge and weigh.

    Sounds like the conversion is the culprit. The new distribution header should have an orifice, sized for the...
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    Prolly a fractional HP motor. Just get the...

    Prolly a fractional HP motor. Just get the Mitsubishi part number or model and order from them. Youíll likely have to get it directly from them anyway.
  18. I have all the parts to build build a gantry out...

    I have all the parts to build build a gantry out of unistrut whatever size and configuration I need.

    Have a trolly that rides in the strut groove and welded 90*ís for the leg bracing.
  19. Thereís some threads about it in tools and test...

    Thereís some threads about it in tools and test equipment forum. I believe there is a warranty recall.
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    I change mine when they start to look dirty, OR...

    I change mine when they start to look dirty, OR if I think they've gotten wet. I keep packs of them, so i'm fairly liberal with changes....cheap insurance to protect your meter.
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    I wonder if they were evacuated with the rest of...

    I wonder if they were evacuated with the rest of the system then!? LOL!!
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    plus, when you call your local parts...

    plus, when you call your local parts center......if you provide the correct serial number and they order the wrong part, it's on them, not you.

    If I have a part number, I give it to them, but...
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    on critical applications, it's very handy to have...

    on critical applications, it's very handy to have the bypass. most people forget to add ports to pump the refrigerant from the shell to the line on the other side of the valve though.....

    also,...
  24. yeah, may just be contrast setting.

    yeah, may just be contrast setting.
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    just select a brand, and call the manufacturer. ...

    just select a brand, and call the manufacturer. they will size a unit for your specifications.
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    if it has orifice headers, they are likely...

    if it has orifice headers, they are likely plugged up.

    prolly is overcharged too.....most people see low suction and add charge to bring it up without thinking about why it's low.
  27. I second the reheat idea.....it should have one....

    I second the reheat idea.....it should have one.

    also, if you work with dehumidifiers, it's the same principal....just mechanical instead of desiccant.

    use your psychrometer to get your process...
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    even a broken clock is right twice a day!:whistle:

    even a broken clock is right twice a day!:whistle:
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    not sure that would be called crankcase...

    not sure that would be called crankcase superheat......you're really attempting to measure oil temperature, to be sure it doesn't contain liquid refrigerant. it's more of a differential measurement....
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    there are regulations that dictate safe working...

    there are regulations that dictate safe working hours. any company that follows OSHA regulations absolutely will not allow more than a 16 hour work day.....in fact, you could be fired for working...
  31. Model number? Operating log?

    Model number?

    Operating log?
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    I thought so too....it was a standard coil unit. ...

    I thought so too....it was a standard coil unit. Didnít even look at seer rating, couldnít have been much higher than 13.

    I measured all the line sets, got outdoor and indoor unit capacities and...
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    If you use the general rule of thumb of 1,000...

    If you use the general rule of thumb of 1,000 ohms per volt, youíre still above that.

    Many things can affect a megaohm reading, including the amount of refrigerant or moisture in the windings,...
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    I've had 2 FP meters not read voltage over 8-10...

    I've had 2 FP meters not read voltage over 8-10 years of using them.

    really I'm glad it happened, as it has forced me to never trust any meter. Now I frequently check my meter on a known voltage...
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    lots of pumps will lose oil to the system with a...

    lots of pumps will lose oil to the system with a power loss. no reason to junk the pump....it's normal.
  36. double post

    double post
  37. what he said. also, if you have a basic single...

    what he said.

    also, if you have a basic single loop, then your bypass needs to be sized to maintain the minimum flow requirements for the chiller.

    if you have a primary / secondary system, the...
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    Why not install a manual reset low pressure...

    Why not install a manual reset low pressure switch in the true suction line?

    If youíre reaching that low of an ambient, you need some condenser coil baffles, or other wind protection also.
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    I worked on a small (7.5 ton) split heat pump a...

    I worked on a small (7.5 ton) split heat pump a few weeks back. The manufacturer provided several charging methods. One was approach, which was saturated temp. and ENTERING air temp.

    They wanted...
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    That 1,000 hours is based on exposure limits. ...

    That 1,000 hours is based on exposure limits.

    It will last longer at lower than rated PPM exposure.....or last less at higher than rated PPM exposure.
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    Are we going to get a follow up?

    Are we going to get a follow up?
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    Also, sizing of chillers should be based on usage...

    Also, sizing of chillers should be based on usage for the load. If you design a system that will have a chiller running nearly fully loaded for a large percentage of run times, youíre better...
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    Wrong sized orifice. Research the correct...

    Wrong sized orifice.

    Research the correct piston size for the condenser you installed.
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    Wait til you get something like a corner grounded...

    Wait til you get something like a corner grounded Delta. 480 between all phases, zero volts from phase B to ground.
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    that's a tough braze, very hard to get the steel...

    that's a tough braze, very hard to get the steel hot enough without melting the copper! Good job!
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    isn't that just reinventing the wheel? what...

    isn't that just reinventing the wheel?

    what if he does all that, and finds out there is a problem external to the machine causing it?

    "oh, sorry Mr. Customer, I know you just paid me $10,000...
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    why did they manufacture the risers fit the round...

    why did they manufacture the risers fit the round hole on the bottom of the pad?:whistle:
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    Prolly gonna be tough on that one. Cool coil...

    Prolly gonna be tough on that one.

    Cool coil has a great idea with ceiling cassettes. Some line set, some 2x2 drop ins, figure out what to do with condensate, and youíre done!
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    Iíve got a 30lb cylinder that either has a hole...

    Iíve got a 30lb cylinder that either has a hole or broken tube. I canít get the bottom 4Ē of liquid out. Have to turn it over to get all of it.

    I donít think any of them have a stub on the gas...
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    Youíre gonna have a really hard time getting the...

    Youíre gonna have a really hard time getting the airflow down that length, unless you could fill the entire drop ceiling space with duct, and narrow it as you go out. Or maybe shoot a high static...
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