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RJ

RJ

Joined on February 3, 2007

Last Post on August 22, 2014

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meter

@ August 22, 2014 2:10 PM in puchasing a new ammeter, recommendations?

The Ampobe acd 14 is made by amprobe you can get it online about $ 150.00

meter

@ August 22, 2014 12:35 PM in puchasing a new ammeter, recommendations?

Amprobe  ACD-14  reads amps, volts, resistance and other features,  compact ,  the meter I would carry in my tool bag,  I would also add an Amprobe lead kit with rubber insulated leads and clips

derating

@ August 6, 2014 5:05 PM in Altitude and Deration

I was servicing my Lennox 100mbh nat gas furnace ( just bought the house in the colo mts  9000 ft .  the burner orfices looked to small,  the furnace previously was on propane, after researching with the local supply house we determined that the orfice size was correct derated  to about 70mbh, still wating to hear from someone at colo nat gas on there feedback.  Lennox had little info I could access as I am a retired fitter and don't have a contractor license.  Also interested in the final solution.  Most of my career was at sea level did not encounter these issues 

auto vents

@ July 18, 2014 10:45 AM in Constantly purging air in hydronic system

auto vents should be valved off after initial start up, they can draw air in if you have low system press.  If your exp tank is on the supply side (not seeing point of no press. change ) ,your NPSP (net possitve suction press. could go into a negative press.causing air to be drawn in.

cfm

@ July 13, 2014 10:05 AM in determing to cfm

Hot wire anemometer.   you can get one for $175.00     when reading air flow at diffusers always factor the free air through the grill or diffuser.  also what Spence talked about, using fan curve for unit

plug

@ July 2, 2014 6:34 PM in major problems with new carrier system

There is a chance that the rubber plugs on the end of the line sets were left in by accident, if any brazing was done on line set a partial restriction or floating debris in line set is a possibility. Something floating in the line set or evap coil may allow normal oper at startup and than cause a partial restriction which could cause compressor overheating and failure as the compressor may not cycle off on the low press control.  Or in one commercial job I worked on the liquid drier was installed incorrectly and the dessicant beads were found in the system

cooler

@ June 2, 2014 2:54 PM in A little guidiance please?

You may need a evaporator pressure regulating valve (EPR ) on your evap coils, they will maintain a set evap pressure   I would contact the local Sporlan or Alco rep for some application help

meter

@ May 15, 2014 4:58 PM in meter

whats the best meter currently out there now for measuring water flow   for example. on w/s heat pumps.  also what is the best balancing valve  1 inch which has meter connections

RTU

@ May 13, 2014 12:40 PM in RTU vs Mini Splits

I would strongly consider replacing the RTU as it is 12 yrs old ?     option 3,  well as a service tech I would not want to run into this 10 yrs down the road after the bldg. changes hands and everyone is trying to figure out whats controlling what.

wire

@ May 4, 2014 1:19 PM in Wiring size controversy

Some installs will require  separate wiring and disconnect for the heat strips, check the codes in your area. Also are you figuring a compressor and a evap motor   whats the total horsepower and KW

high press

@ April 12, 2014 11:36 AM in lowering steam pressure in a industrial building

Hopefully they are involving a mech.engineer     From my experience working with high press. steam,  smaller diameter piping sometimes could be used.   lowering the main press. with the same size piping may be a concern.

damper

@ April 9, 2014 6:49 PM in New install Furnace

Better to balance air flow at the plenum    using vents or diffusers for balancing can cause velocity noise. although most residential installs don't use these, I would put them in if I was doing a new install.

damper

@ April 9, 2014 10:17 AM in New install Furnace

I would install these dampers on the plenum ahead of the runs     easy install

hvac contractor

@ April 9, 2014 9:47 AM in Looking for residential installer in Denver, Colorado

Pasterkamp  Heating or AMS mechanical

install

@ April 7, 2014 11:03 AM in New install Furnace

I recommend a manual damper installed on the supply plenum for each run for balancing purposes,   you can buy a ductulator on line to help you size all duct.

traps

@ March 26, 2014 7:14 PM in Removing and loosening painted radiator condensate trap covers

Get the paint off like Jamie said.  For the radiator trap I would use my pocket knife and cut the old paint around where the cap assy screws to body ( where gloves )   than use a large  socket  and breaker bar, tighten first  (clockwise)  this will help break any paint and rust loose. than loosen using large pipe wrench for backup.  For the F&T trap a lot of paint removal and rust dissolver. You may consider replacing the entire F&T trap ( picture on right ) as a lot of the rebuild kits cost almost as much as a new trap.

fuel cell

@ March 19, 2014 7:01 PM in fuel cell

Thanks all .    Rick

megohm meter

@ March 19, 2014 6:59 PM in compressor

Supco M501 is a good inexpensive meter for checking hermetic compressors. about $160.00        New hermetic compressors will usually show a insulation resistance value of 100 megs or higher, readings of 50 megs or less indicate either the winding insulation is deteriorating or the oil/refrig is contaminated, may be moisture in system. The first step if you get a low reading would be to clean up system (install oversize liquid drier ). If you still get a low reading I usually explain to the customer that the winding insulation is breaking down and that premature failure of compressor is inevitable.  I have seen compressors run along time with low readings.  This meter can also be used to check motors and transformers. If you are going to work on larger equip. a crank style meter will give you more options     AmpProbe makes a good one    they can run in the thousands

fuel cell

@ March 10, 2014 6:50 PM in fuel cell

A friend called me from another state  about a major hvac upgrade they are looking at doing to there church.  One person at the church wanted to look into replacing the boiler and emergency generator with a fuel cell ?  any input on this would be great. don't know any equip details at this time.
thanks      Rick

traps

@ February 26, 2014 8:36 PM in Condensate drain trap question:

Over the years I have seen hundreds of poorly installed and misunderstood cond. trap installs    If the condensate pan is on the inlet side of the fan then a trap is needed or the static of the fan will not allow water to drain.  Can you post a drawing of your system.  the dimensions of the trap, especially in larger units depends on the air static of the system

exp tanks

@ February 20, 2014 6:17 PM in Waterlogged Compression tanks

Go to the main wall jan. 9  2014          compession/exp tanks

geo

@ February 20, 2014 6:06 PM in geothermal vs. airsource

Water furnace   makes a good product and I believe they have engineering available
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