Type: Posts; User: Allen
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There is a question that you may want to ask the manufacturer, What is the suction gas velocity at the minimum stage of loading?
The suction gas velocity needs to be at least 1000 feet...
The duct leakage testers that are produced by United and several others all have an orifice plate in the discharge tube. The pressure drop across the orifice is measured using either an...
At our apprentice graduation, on the 6th of June, the apprentice that graduated number one was 48 years old.
Like Timebuilder and Redman 1126 said, if you can get in do it....
This just shows that you have to work the bugs out of any unit.
I'm sorry, I couldn't resist.
Yes, the blockage was probably doing what you stated.
I use a piece of software titled Smartdraw. http://www.smartdraw.com/
It is a simple program to use, and you can create your own symbols.
With the UCP having 24 vac to it and the fuse is good, but the red LED is not lit.
The UCP is bad, it must be replaced. That is from page 46, Section 9.1 of the Black Book.
I agree with Hands, Never use Acidaway.
I heard a chemist speak about it in reference to system clean up, her comment was "Acidaway is horrible."
You should follow Hands directions, you...
I agree with Alcomech, that Shortridge is the best.
About calibration, considering the amount of money that you will be spending for these instruments, no matter what brand you choose,...
If the solenoid fails, the VCM is going to still go through the calibration process. Since it cannot vent the high port to the low port the pressure difference will not go to zero. When...
Thank you for the information on the app.
Local 602 serves Washington, DC, Maryland and Northern Virginia.
Good luck to you my friend.
Where did you get your psychrometric app for your Iphone?
Hi Durable Machinery,
Your leaving wet bulb temperature is too low, does not make sense.
I would expect the wet bulb temperature to be around the 55 degrees.
When the air leaves the...
Is the armature (moving part of the starter) pulled completely in?
If it is not pulled completely in, the coil of the starter will pull more current than it should.
The coil of the...
You must weigh the refrigerant charge into the RTU.
Keep warm thoughts.
They are arc guards or also called arc chutes. Their purpose is to give a path to the arc that is created from the inductive "kick" when the contactor opens. They are there for safety...
The VCM goes through calibration once every minute. The calibration sequence is initiated by the firmware in the VCM.
The actual process is: 1. calibration sequence is initiated
Did you check the bellyband crankcase heaters?
The "cornerstone" scrolls must have crankcase heaters.
If the compressors are getting noisy, it could be refrigerant washing the oil off...
There is nothing wrong with the UCM.
If the VAVs are connected to Summit, Summit is stopping your override, and returning it to normal operation. Or what it perceives as normal....
Do you know what the tonnage of the unit or model number?
The model number would be best.
I have pulled the GE book out of the attic.
Let me know.
I will scan it for your tomorrow.
I thought I had it here on this computer
but it is a BTC, cooling only not a heat pump.
By the way, Trane bought GE's air conditioning...
The piping material will be determined by the size of the piping being run.
Typically, what I have seen is, 2.5 inches (63.5 mm) or less is copper.
3 inch (76.2 mm) or larger is...
The advantage of a direct return system is lower cost of materials and labor.
The terminal unit piping is returned to the system return directly, so those returns are of different...
The contacts that you are referring to change state when going from unoccupied to occupied, as you read.
Trane considers heating in a VAV RTU to be an unoccupied operation.
When your 90...
You have a model M compressor in the condensing unit. and there is a two step process to determine what in the Guard Pak (GP) shut the compressor down.
The two things are oil pressure as...
Hi Vic Expert,
I teach in our Local's apprenticeship school.
Is there any training literature or videos available for the Vic fittings and systems?
I had learned the different formulas through the years doing my job. Knowing those formulas helped me to do my job as a serviceman.
There is a good book available from the...
In our chapter we have NEBB certified firms that are not union, and those firms have members that are represented on our different chapter committees, ie technical and educational. One...
Why do you feel that NEBB is exclusionary?
"NEBB's exclusionary practices will make you a lonesome lonely guy."
All they want is for a candidate to pass some tests, that are not...
Knew York could not have presented the union side better.
I'm in the local in the Washington, DC area, and I went through the same way as Knew York. The journeyman classes are excellent.
What is currently controlling the loading and unloading.
Are you cooling air or water?
To load and unload that compressor by suction pressure now, you would need to change the...
Did you learn from your mistake?
Did you clean up your act after and work hard to be a better person?
With you saying that it occurred 17 years ago, I think my two questions have been...
Hi Climate Frontier,
The chilled water flow is the most important flow, too little flow and you won't get the moisture removal that you need.
With that being said, in heating you can get 90% of the...
Hi Jerry ,
Yes, a failed economizer board can cause your problem.
Turn off the power to the unit, take off the access panel for the filters.
Look above the filters at the access panel there you...
Is the unit a VAV? A VAV unit is controlled by supply air temperature in cooling.
The individual VAV zones should have their own heat in the VAV boxes.
The heat in the rooftop unit is...
That is a good question.
If the Exhaust Enable settpoint was set as you recommend the exhaust fan will not start until that space pressure gets above the space pressure setpoint plus...
Hi Aircooled 81,
Go into the Setpoint menu and find "Exhaust Enable Setpoint". The factory default setting is 25%, lower that down to 5%. Changing this setting will only enable the exhaust logic in...
You did not specify, but I have assumed that the furnaces are gas fired.
You have a 1.5 million BTUH furnace that requires a certain amount of airflow to prevent the heat exchanger...
I agree with Beenthere, that 200 cfm per ton is typical, and like Beenthere I have seen MUA units on the "light" side of 200 cfm per ton.
Yes, I agree with you, in that the HSI also serves as the flame sensor.
The Fenwal ignition module, that mirfgtech stated, is being used provides the power supply for the flame current....
The purpose of that transformer is to apply 24 vac to the HSI when not in the heating mode. The reason that they did that, it was a retrofit to earlier units, was to keep the HSI warm so...
Hi neophytes serendipity,
I pulled my card out to check it, my card states that I am a BTJ.
I was a HVAC service man for close to forty years, about 21 years at the last company.
I teach the...
The power should enter at the electric heat section.
Trane has run three power wires through the unit from the electric heat section to the control panel, you will find that they are...
I agree with JP Smith, 2 psid replace the filter.
To answer your first question, I'm going to ask a question.
Is the suction line filter that is installed a replaceable core suction...
There is another drawing software package that is good.
The motor is bad, it has shorted internally winding to winding causing it to run continuously.
You must replace the motor.
Do you have a local contractor to call for this service?
The IntelliPak unit does NOT have a split coil like the Voyager II units. The IntelliPak has a single coil as Southern Mech stated.
Do the procedures that Lynn Comstock has...
Hi oldtimer 2,
I meant to ask,
Are you out of Local 420?
I met a few guys from Local 420 in Michigan last week.
Hi oldtimer 2,
This is what has worked for me for years, 75 cfm per KW of electric heat.
If you work the math out on a 2 KW heater it will work out to be a 42 degree temperature rise. When you...