Type: Posts; User: fatboy
The upgrade is 3-4 weeks away from D/B
School starts in 3 weeks, teachers in bldng in 1 1/2 weeks , chiller does entire 800 student school
D/B says retrofit will take 30-40 hours
GB at D/B...
Anyone performed the Dunham Bush NC25-4 controller (obsolete- originally made by Danfoss) upgrade to the Dunham Dush Director controller.
I have one on order thru DB, curious on ease of conversion...
could your low limit setpoint be holding the damper signal closed
I was on their site recently inquiring on a vav box
they had info on pneaumatic,analog and ddc setup of their box's
not doing much JC work anymore, but I run a dual boot operating system on my laptop and I have accessed JC controllers thru both Oper Sys's ( XP Pro and 2000)
my laptop has a serial port
never perform a megohm test on a compressor motor that is in a vacuum
if set up properly, your P66 will come on first, then as press rises, your fan cycle controls will stage the remainder of fans and possibly back off or nearly stop your P66 fan
I was under the schooling that press independant vav box's
use the hi/lo pickup tubes, not press dependant
a press independant box measures the delta P across the p/u tubes and then...
you whorersalesers at Carrier already rape us(contractors) for the cost of parts
sorry about your luck,,
when I call you factory guys, I expect answers
in my area we are referred...
when you call into tech support
and play the phone tag game to get to the answer man
you better have the info available that they want
like NormC said, show you know what your attempting to...
HW Chiller Man
sounds like I need to checkout the Copeland screw line
have you serviced much Hitachi screws?
if so how do they compare to the Mcq or copeland?(got a few D/Bush chillers that...
HW Chiller Man
thanks for the repost, sounds like you have this retrofit under control.
the 10 sec on/off delay, is this to position the slide vlv for capacity?
If I remember correct my 80t...
hw chiller man
you got me curious on the Copeland screw replacement
what tonnage is available on the Cope screw?
how detailed of retrofit and will the Microtech boards control the...
why are you using 4 DX9100's, would not 1 do the job
(seems a lot of overkill to me to use 4)
or would not JC unt controllers be less expensive
so you have alot of exp with the dca's
my question on a possible gear problem on the now defunct/out of production 35in/lb 2 position 24v ML81851008 spring return produced...
what quality of system do you want
cheap- seperate cooling only rtu with ductwork
moderate- mini splits but at 20x20 you could need 10+ tons/3 units
quality- ATStulz or Liebert self...
anyone having bad experiences with the ML series direct coupled actuator?
Hnywl now has the MS series to replace the ML series that was marketed in the 2000- late 2002
got a few jobs that the...
When I megohm compressors on pm or service work, I use the data to establish a trend and then compare these readings from pm to pm to see if the megohm value is consistent or dropping.
I guess i read the other posts and thought this unit was a 100%oa setup as Maxster mentioned in his post, when I reread Geo1950 's original post he does not mention 100%oaair, anyways...
your electric unloaders are most likely controlled by a discharge air controller to maintain a desired supply air temp
I would set the hot gas bypass regulator to a suction press/temp to prevent...
are not Alen Bradley and ABB to seperate manufacturers of vfd's?
you are going to have some press drop difference between disch serv valve and the liq line- I see it all the time on larger tonnage units
the only true press drop reading across the...
like the others stated, more info on the setup would be desirable
had a new install of a vav system where the suit/tie engineer figured a reheat indeco box on the med press air duct- only...
I agree with BobbyM
cond was misordered.
most OEM's don't offer a 40+tonnage unit in a single circuit anymore, I believe Mcq and AAON do, all others are custom made
You may have to remove...