| | Preview | User | Replies | |
 | "Help " , posted Thu 3 May 00:35
Commerical system has extreme high suction, and low head. Twinned evap coils, single condenser, with 2 compressors. No funky noises. 120 psi on head, 1 degrees subcool, about 95-100 on suction, 66 ... read more |
timothynd28
 |
Replies (3)
Re(1):Help - so_cal_tech
Re(1):Help - shortys
Re(1):Help - SMB
| |
| "Question for a top tech " , posted Wed 2 May 18:03
im working on a 75ton trane and im having some charging issues. The 2nd stage has a sight glass and seems to run fine. the first stage doesnt have a sight glass and superheat is fine, but the sub cool ... read more |
SMB
|
Replies (13)
Re(1):Question for a top tech - kimmy
Re(1):Question for a top tech - kimmy
Re(1):Question for a top tech - kimmy
Re(1):Question for a top tech - chiller guy
Re(2):Question for a top tech - SMB
read more
| |
| "2 stage thermo to 2 units " , posted Tue 1 May 02:02:
LuxPro PSP722E - 2stage heat & 2stage cool thermoconnected to2 gas furnaces controlling 2 AC units.The newly replaced control boards on the furnaces no longer allow operation with the ... read more |
mbales
|
Replies (1)
Re(1):2 stage thermo to 2 units - AQA
| |
| "help please " , posted Thu 26 Apr 18:59
Hey all you hvac'ers, Im a student and I could use some helpI need to find some info regarding the installation requirements/process of an air to air heat pump system in a bank. ANY help at all wo ... read more |
btu4life
|
Replies (0)
| |
| "Hot gas defrost systems " , posted Thu 26 Apr 01:22
Hi,I was wondering if anyone here has experience with automatic, pressure actuated hot gas bypass systems i.e. not actuated by any solenoids but actuated by pressure variations in the working ... read more |
steveaus
|
Replies (4)
Re(1):Hot gas defrost systems - kimmy
Re(1):Hot gas defrost systems - Chiller guy
Re(2):Hot gas defrost systems - steveaus
Re(3):Hot gas defrost systems - chiller guy
| |
| "-20 freezer " , posted Tue 24 Apr 03:05
We are planning to construct a -20 deg C walk-in freezer with box external dimension of 5.5m L x 26.12m W x 2.7m H with no controll RH. It will be installed in an air conditioned room at the second fl ... read more |
redmm
|
Replies (1)
Re(1):-20 freezer - commtech
| |
| "pump couplings " , posted Thu 19 Apr 16:49
what do i need to know when changing rubber pump couplings?is it as simple as loosening the set screws, removing the old couplings, and using a straight edge to verify the alignment? ... read more |
ref tech
|
Replies (2)
Re(1):pump couplings - ckmb5150
Re(1):pump couplings - shortys
| |
| "American Standard RTU doesn't restart " , posted Thu 19 Apr 14:52:
My American Standard RTU, after a cold start, will run just fine. After it cycles off, it will not restart on its own. I have replaced the compressor (2yrs ago), this year the mainboard, t-stat, and h ... read more |
Circuit
|
Replies (9)
Re(1):American Standard RTU doesn't restart - so_cal_tech
Re(1):American Standard RTU doesn't restart - chiller guy
Re(2):American Standard RTU doesn't restart - Circuit
Re(3):American Standard RTU doesn't restart - Chiller guy
Re(1):American Standard RTU doesn't restart - chiller guy
read more
| |
| "unit sizing? " , posted Sun 15 Apr 17:54
i have a 3000 square foot building with insulated attic and 18 foot high ceilings what size air handlers should i put i would normally do 5 ton for 3000 square feet but how do i compensate for the hig ... read more |
hvactek
|
Replies (1)
Re(1):unit sizing? - drcuervo
| |
| "9RS30765TFC Compressor Info Required " , posted Mon 9 Apr 23:29
Hi guys!Ok, came across a walk in freezer running HP 80. I have identified the TXV's are undersized on the 2 coils, based on box loading conditions.Problem is I haven't been able to find o ... read more |
rustymike
|
Replies (1)
Re(1):9RS30765TFC Compressor Info Required - mikeweber3
| |
| "These Tranes are derailing me! " , posted Thu 5 Apr 19:21
We have several 4 ton Trane rooftop heat pumps where I work, mostly model WSC048A3R___. Being heat pumps, the outside coils freeze up in lower temps with high humidity. Half of them don't defrost. The ... read more |
gdeer
|
Replies (1)
Re(1):These Tranes are derailing me! - chiller guy
| |
| "Wiring Programmable Thermostat " , posted Wed 4 Apr 15:07
Want to replace Am Standard ASYSTAT652 with programmable Honeywell TH6620D for 2 stage heat pump one stage cooling system. Need help with wiring. Am Standard: R (24 V hot) Y (Compressor) O (Reversing ... read more |
sweetdealinc
|
Replies (2)
Re(1):Wiring Programmable Thermostat - Houston204
Re(2):Wiring Programmable Thermostat - sweetdealinc
| |
| "I need a trane service manual " , posted Mon 2 Apr 19:53
I need a trane service manual for a make up air unit model dfoa218fnbb5aej13bocdefjknyn any wireing diagrams ect would greatly be appriciated. ... read more |
trykonxlgold75
|
Replies (1)
Re(1):I need a trane service manual - Houston204
| |
| "York rooftop DCUC-T150N245A " , posted Mon 2 Apr 15:40
Anyone have a guide for York equipment model nomenclature? My current challenge is a York packaged rooftop model DCUC-T150N245A. I assume that the 150 means 150 btuh cooling = 12.5 ton nominal size. ... read more |
WisTexan
|
Replies (0)
| |
| "in senior listing below..unit is T8600C " , posted Tue 27 Mar 19:46
did not make clear-we need old damaged or whatever Chronotherm III T8600CPlease.must replace wall panel before hot weather begins. ... read more |
wilcoxco
|
Replies (0)
| |
 | "Re:size of old sears unit " , posted Tue 27 Mar 09:47:
I need to know what size this equipment is.Can you help me? This is OLD Sears Equip.Model # 867-816862Serial # 70871217Style # 42tD7035650Mfr.# 703912 ... read more |
Smi
|
Replies (0)
| |
| "Tripping Breakers " , posted Tue 27 Mar 07:45
Hi Techs, I have a 1ton Carrier unit that tripps the breaker every time its energized. Wondering where to start looking for the problem. ... read more |
postal
|
Replies (3)
Re(1):Tripping Breakers - fire and ice
Re(1):Tripping Breakers - theduke03
Re(1):Tripping Breakers - bretster
| |
 | "need old or broken - senior HELP! T8600 " , posted Mon 26 Mar 12:07
Son broke wall unit for our T 8600 Honeywell Chronotherm III.If you have one or old non-working 8600 thermostat we need desperately...just an old discarded backpiece will do the job.Pl ... read more |
wilcoxco
|
Replies (1)
Re(1):need old or broken - senior HELP! T860 - so_cal_tech
| |
| "Total Shut down!! " , posted Sat 24 Mar 06:51
Got a 5 ton American Standard and it completely shut down on me, even the thermostat control was out. I checked to make sure power was going to unit, and then I pushed the reset button on the contact ... read more |
amormino72
|
Replies (6)
Re(1):Total Shut down!! - fire and ice
Re(1):Total Shut down!! - amormino72
Re(1):Total Shut down!! - theduke03
Re(1):Total Shut down!! - bretster
Re(2):Total Shut down!! - azacdoc
read more
| |
| "Trane RA 400 " , posted Fri 23 Mar 19:44
I am looking for a Clearly legible diagram for a Trane ra400 ... read more |
highercry
|
Replies (0)
| |
| "IAQ for school classrooms " , posted Fri 23 Mar 05:56
Dear fellows:I just recently finish the installation of some ductless mini split systems in a local elementary school. Everything working fine so far. But now school board members are worried ... read more |
reftec021702
|
Replies (2)
Re(1):IAQ for school classrooms - rustymike
Re(1):IAQ for school classrooms - destinktive
| |
| "mepsurplus.com got me the parts " , posted Thu 22 Mar 02:30
Everyone reading this HAS extra stuff waiting to be used on that next job, or maybe you need something that your supplier just cant get you in time.....go to read more |
roberts hvac
|
Replies (0)
| |
| "Oil Boilers " , posted Sun 18 Mar 18:48
just curious about an installation. Another company installed several lennox oil fired boilers on a passenger train. i was wondering if they had to be certified for use in a mobile installation or if ... read more |
TeddyB
|
Replies (0)
| |
| "Unit size " , posted Fri 16 Mar 15:50
Knowing absolutely nothing about HVAC, how does one determine the size (in tons) of an existing unit scheduled to be replaced?Thanks much for help! ... read more |
TapTV
|
Replies (5)
Re(1):Unit size - Bretster
Re(2):Unit size - taptv
Re(3):Unit size - Bretster
Re(4):Unit size - taptv
Re(3):Unit size - Bretster
| |
| "Ruud 3.5 heat pump high head pressure O/L " , posted Tue 13 Mar 23:59
Today I was sent to service a Ruud 3.5 ton heat pump with an ECM motor. The start up failed, did the re-wire, unit runs fine in cool. Now, in heat mode, the unit runs an very hot liquid line (3/4), an ... read more |
bbaker
|
Replies (1)
Re(1):Ruud 3.5 heat pump high head pressure O - theduke03
| |
| "Trane 3AAT80B1A1 to Rite-Temp 8082C HELP!!!!" " , posted Sat 3 Mar 16:27
Help!!!I'm changing out a 2-Stage Trane 3AAT80B1A1 to a Rite Temp 8082CMy Trane has an X2, T and is jumped from W to U. I'm not sure where to go with any of those three.The Rit ... read more |
rakoczy27
|
Replies (1)
Re(1):Trane 3AAT80B1A1 to Rite-Temp 8082C HEL - static
| |
| "Carrier WeatherMaker 9200-Heating problem " , posted Thu 1 Mar 19:46:
In my church we have a Carrier WeatherMaker 9200. Two units work together to heat the main hall. Recently one unit worked unstable. The frame was put off inside furnace in about three minutes. Some ti ... read more |
chaut123
|
Replies (1)
Re(1):Carrier WeatherMaker 9200-Heating probl - theduke03
| |
| "Edit:: Sorry, wrong forum. " , posted Tue 27 Feb 21:58:
sorry, wrong forum. Delete ... read more |
duncantuna
|
Replies (1)
Spanish webcams for adult - Moheros
| |
| "help wiring totaline t-stat " , posted Tue 27 Feb 11:53:
Changing a honeywell t-stat over a totaline programable P374-2800, unit is a Rheem heat pump.Honeywell T-stat had brown - Cred - Rgreen - Gyellow - Ywhite - WTo ... read more |
klaservice
|
Replies (1)
Re(1):help wiring totaline t-stat - rickmcd72
| |
| "Water source noise " , posted Mon 26 Feb 20:20
Got a large unit with a BAD noise from the water coil. Flow is good based on the diff across the reg valve. any ideas? ... read more |
Dazz
|
Replies (1)
Re(1):Water source noise - shortys
| |
| "chiller " , posted Thu 22 Feb 18:23
can condensate occur in a common barrel for a dual circuit water chiller if on circuit is operating with 45 degree water and the other circuit is being evacuated ... read more |
hvaccur
|
Replies (1)
Re(1):chiller - chiller guy
| |
| "Trane Failures " , posted Wed 21 Feb 11:31
I have recently heard about Trane units failing during power outages when outside temperatures are cold and I don't know why. I am guessing that it has to do with the unit being suddenly shut down whi ... read more |
sbbgf8
|
Replies (1)
Re(1):Trane Failures - Antonetz
| |
| "blower motor " , posted Tue 20 Feb 22:26
I have a 1987 Rheem gas furnace and I am replacing the blower motor. The motor has seven wires: black, blue, white, brown/white, brown, yellow, and red. My furnace has black, red and white. I am tryin ... read more |
nygiants7
|
Replies (2)
Re(1):blower motor - Antonetz
Re(2):blower motor - nygiants7
| |
| "Heat pump mysteries " , posted Thu 15 Feb 12:40
I have a armstrong heatpump unit in a 900 sq ft commercial building.It is a 3 ton unit.I have it ducted into the building with 8 registers and 1 12 inch return.My problem is ..over the past month the ... read more |
Liljoe
|
Replies (2)
Re(1):Heat pump mysteries - jbac
Re(1):Heat pump mysteries - Antonetz
| |
| "york furnace issues " , posted Wed 14 Feb 22:55
OK, OK, I am a newbie and i see this topic has been beet to death but. I am renting a building that has a outdoor your furnace/air-conditioned I do not have the model number with me right now but I wi ... read more |
bcol7473
|
Replies (3)
Re(1):york furnace issues - Antonetz
Re(2):york furnace issues - bcol7473
Re(3):york furnace issues - Antonetz
| |
| "propane to gas conversion " , posted Sun 11 Feb 16:01
i am attempting to convert a dayton propane only unit heater, attempted to obtain a coversion kit & there are none for this paticular heater, so i have changed the gas valve & can not obtain any infor ... read more |
Antonetz
|
Replies (4)
Re(1):propane to gas conversion - ExtremeAC
Re(2):propane to gas conversion - Antonetz
Re(3):propane to gas conversion - kalining
Re(4):propane to gas conversion - Smi
| |
| "Lux TX9000TS from Baystat240A " , posted Sat 10 Feb 16:19
Am trying to put a digital thermostat in to replace baystat240a but can't figure out wiring and would appreciate the help.Baystat240A wiresTan-TBlue-BOrange-OYellow-YGreen- ... read more |
dthangl187
|
Replies (1)
Re(1):Lux TX9000TS from Baystat240A - Houston204
| |
| "Time to replace? " , posted Sat 10 Feb 09:43
I have a 16 year old Miller cmf 80-po oil furnace which currently stopped working. The last time I had it serviced the tech said it had a crack in the burner plate but was no emergency at the time to ... read more |
babyrotten
|
Replies (1)
Re(1):Time to replace? - Rustymike
| |
| "Need diagram to hook up Honeywell thermostat " , posted Tue 6 Feb 20:42
Does anyone have an instruction manual for the honeywell thermostat RTH110B? I need a diagram to follow for installation. ... read more |
G Chambers
|
Replies (2)
Re(1):Need diagram to hook up Honeywell therm - ExtremeAC
Re(1):Need diagram to hook up Honeywell therm - evildberg
| |
| "Need diagram to hook up Honeywell thermostat " , posted Tue 6 Feb 20:40
... read more |
G Chambers
|
Replies (0)
| |
