Ran across a 20 ton Byrant LP RTU today that is data tagged at 3.2" wc
on the manifold and verified by the manufacture as such. That's a
first for me. Every other piece of LP equipment I've ever seen runs
10" wc on the manifold.
"Unusual"?? hehe. That's quite an understatement. That furnace was
undoubtedly the strangest machine ever. And the "flapper". Now that
was a piece of artwork. And then the ol water pressure test to check
for heat exchanger leaks. Now that was some engineering work.
POS. Gotta love ol "Dave".
Tempstar happens to be getting on my nerves a bit too.
Installed a 2.5 ton 12 Seer heat pump back in 2005 for my cousin.
Working fine till last week. Found the outdoor expansion valve had
rubbed a hole in the cap bulb line so the bulb lost its charge. No
valve in stock at my Tempstar dealer (They have 8 diff wholesale
houses in 3 states. Had to get it from the factory. It comes so I go
do the job. About 5 hrs for a damn bulb change. A big part of that was
getting that damn frozen refrigerant out of the unit at 9 in the
morning on a 20 degree day. Had a cube heater, hand held propane torch
and covered the top of the unit to warm it up. Anyways, changed it
out, press tested, evacuated (changed the bi-flo drier in the outdoor
unit), weighed in the charge and turned it on. Compressor sounded a
bit funny and I watched the suction gauge pump all the way down to
zero!! Freaking garbage new exp valve from the factory! I was a little
leary because when I got the new valve out of the box it looked rather
tarnished and not shiney new copper and brass. Looked at the date
code. It TOO was a 2005 new expansion valve. Its one with the check
built into the valve, non bleed with the external eq line.
What a crock of chit! Ordered the new valve again. Wonder what I'll
get this time?
It sure would be nice to build units with bypasses and shut off valves
around the exp valve so when they crap out on you, just valve it off,
unbolt or unsweat, pop in the new, a quick evac on the valve and a cpl
inches of tubing and away you go again. I know it would be more
expensive to build but hell, around here the require new boilers to be
installed with valves on almost every piece on the unit to avoid
draining the system.
Maybe Ohamma will require that. hahahaha
Valves only work if you exercise them once in a while which is
something that usually isn't done. I've seen a lot of new butterfly
and ball valves not hold worth a damn after a few years. I've also
seen quite a few gate valves fail because the stems to the gate break
when you try and valve them off.
I had to replace some HW valves in an old church last week that
wouldn't shut off completely and the only valves in the loop were at
the boiler. Took all day to replace four angle valves with a union
outlet because of it. Purging the air was a real bitch. I replaced
the coin vents on the baseboard with some #67 auto vents to help take
care of any remaining air which worked out fine. Systems with air
separators are a lot easier to deal with.
3.2" seems low, but is not unusual.
Since lots of gas lines "out East" are ancient many run on very low
Not long ago, (w/in 15 yrs) Boston & Chicago still had gas mains made of
14" WC gas pressure was all that could be delivered at the street.
Bring that into a building, & run it through a meter, & 7" was the max
they'd "guarantee delivered"
7" WC pressure out from the meter, & a reasonable pipe TEL (total equivalent
length), common practice meant most equipment was sized to operate on a
standard loss of 50% from the meter...
With high pressure gas out West (80 psi at the street) it does seem "small"
I'm assuming Bryant built it for worst case & offered up a $10-20.00 kit for
Sure would lower production costs.
Maybe they built it to operate in sub zero temp zones...
Propane pressure drops as the temps drop below zero, & has none at all if
it's below it's -44dF boiling point.
Not common, but well above my states low temp record... (-60dF in Tower, MN
Add to that the pressures of tanks near empty, tank heaters are common, &
many are underground.
But, I could be wrong...
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