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 | "roof top ac question " , posted Wed 19 Apr 10:03
In a rooftop a/c unit what are the four operating factors that will affect the cooling capacity of the unit? ... read more |
hvacbrat
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Replies (5)
Re(1):roof top ac question - supertech7
Re(1):roof top ac question - supertech7
Re(1):roof top ac question - dumbapprentice
Re(1):roof top ac question - acefurnacefixer
Re(2):roof top ac question - docker
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| "d.c. heat cool T.stat " , posted Sat 15 Apr 13:17
secqence of operation ,troubel shoot ... read more |
oper49
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Replies (2)
Re(1):d.c. heat cool T.stat - dumbapprentice
Re(2):d.c. heat cool T.stat - Freezone12
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| "Newbie (questions about schematic diagrams) " , posted Mon 10 Apr 13:22
Thanks for looking at this message, just wanted to know if there was a way to post a schematic diagram and ask a question?I'm in my first year of hvac in Ontario. Licensed as Gas 3 certified, I s ... read more |
toronto24
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Replies (1)
Re(1):Newbie (questions about schematic diagr - rjohnson2152
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| "Price quote for cental air " , posted Mon 27 Mar 21:59
I have received several different prices to have central air installed in my house. Return vents would need to be installed.(I'm remodeling, they have full access all walls and ceilings in the ho ... read more |
johnny4658
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Replies (4)
Re(1):Price quote for cental air - Weber
Re(1):Price quote for cental air - strosfan
Re(1):Price quote for cental air - rjohnson2152
Re(1):Price quote for cental air - acefurnacefixer
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| "Heil Rooftop " , posted Mon 27 Mar 14:21
Can anyone give me any information on an old Heil rooftop unit model NRGR10HN30D? if there are cut sheets out there that would be great. ... read more |
bmw19
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Replies (2)
Re(1):Heil Rooftop - oldbobsr
Re(2):Heil Rooftop - bmw19
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| "York T874R Sub Q674L to Honeywell RTH7400 " , posted Sat 25 Mar 20:18:
Like many I am looking to upgrade my heat pump to a programmable thermostat and am having issues with the wiring...Honeywell is of no assistance.The current base: Q674L has the following conne ... read more |
mdiaddez
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Replies (8)
Re(1):York T874R Sub Q674L to Honeywell RTH74 - Xenos
Re(2):York T874R Sub Q674L to Honeywell RTH74 - Xenos
Re(3):York T874R Sub Q674L to Honeywell RTH74 - mdiaddez
Re(4):York T874R Sub Q674L to Honeywell RTH74 - Xenos
Re(5):York T874R Sub Q674L to Honeywell RTH74 - mdiaddez
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| "Manitowoc Ice Machine/HP-81Refr/G600 series.. " , posted Tue 21 Mar 17:51
I have a Ice Machine that runs but will not leave the Harvest Cycle.....and the pumps does not shut down and continues to run water over the evaporator...or the Dump valve will not close and stays ope ... read more |
David45Morton
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Replies (4)
Re(1):Manitowoc Ice Machine/HP-81Refr/G600 se - fitter597
Re(2):Manitowoc Ice Machine/HP-81Refr/G600 se - David45morton
Re(1):Manitowoc Ice Machine/HP-81Refr/G600 se - gsxrsquid
Re(2):Manitowoc Ice Machine/HP-81Refr/G600 se - david45morton
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| "Im trying to install a thermostat " , posted Mon 13 Mar 22:30
Help!!! Im trying to replace an old Bryant thermostat with a new Hunter 44260. Ive read the directions a million times and most of the letters dont corespond with the instructions. This thermostat tha ... read more |
tim831
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Replies (3)
Re(1):Im trying to install a thermostat - cookie monster
Re(1):Im trying to install a thermostat - acefurnacefixer
Re(1):Im trying to install a thermostat - blackngold
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| "Capacitors " , posted Sat 11 Mar 17:59
Are "start" and "run" capacitors interchangeable---if not how do they differ in manufacture. ... read more |
Dog Biscuit
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Replies (3)
Re(1):Capacitors - wirednut
Re(1):Capacitors - chiller guy
Re(2):Capacitors - hvac tech ut
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| "Ultrasonick leak detector? " , posted Mon 6 Mar 23:01
I am curious if any of you use an ultrasonic leak detector and how you feel about them if you have any experience with them.Am thinking about buying one for the upcoming cooing season.I ju ... read more |
zander
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Replies (8)
Re(1):Ultrasonick leak detector? - zander
Re(2):Ultrasonick leak detector? - theapprentice
Re(1):Ultrasonick leak detector? - theapprentice
Re(1):Ultrasonick leak detector? - kevink
Re(2):Ultrasonick leak detector? - zander
read more
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| "5h compressor bearing removal & inserts " , posted Sun 5 Mar 05:01:
WHAT IS THE PROCEDURE OF REMOVING AND INSERTING THE MAIN AND PUMPEND BEARINGS FOR 5H46 CARLYLE COMPRESSOR . PLS EXPLAIN IN DETAIL, BETTER IF THEREIS ANY PICTURE OF PROCEDURE....AND WHAT TOOL IS USED F ... read more |
altaf22m
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Replies (2)
Re(1):5h compressor bearing removal & inserts - Rustymike
Re(2):5h compressor bearing removal & inserts - Freezone12
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| "manuels " , posted Sat 4 Mar 16:19
does anyone know where i can get lennox G24M2 series manuels quickly? ... read more |
Judge722
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Replies (1)
Re(1):manuels - harpo
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| "Gauges. " , posted Fri 3 Mar 11:04
I've been thinking about getting a gauge set that measures both 410A and R22. They sell them, but is it ok to mix the different oils in the freons? Also The R22 reading is close to the begining of thi ... read more |
theapprentice
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Replies (6)
Re(1):Gauges. - Weber
Re(1):Gauges. - acefurnacefixer
Re(1):Gauges. - Freezone12
Re(2):Gauges. - theapprentice
Re(3):Gauges. - dumbapprentice
read more
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| "push pull recovery question " , posted Thu 2 Mar 15:28
i,am getting ready to take my practical exam and have been going over the push pull procedure for large centrifigal machine "r123" my question. after pulling the vacume on my recovery tank and lines ... read more |
wedge
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Replies (2)
Re(1):push pull recovery question - chiller guy
Re(2):push pull recovery question - wedge
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| "changing filter dryer " , posted Thu 2 Mar 15:14
can i braze in a new filter dryer on the liquid line of a large recip chiller "carrier 30hr r502" after pumping down to the condenser and pulling a vacum on the line to remove any remaining vapor? or ... read more |
wedge
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Replies (3)
Re(1):changing filter dryer - Chiller Guy
Re(2):changing filter dryer - wedge
Re(3):changing filter dryer - dumbapprentice
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| "Honeywell to white rogers gas valve wiring " , posted Sun 26 Feb 17:35
They sent me white rogers valves to replace the current honeywell valves on my commercial GCS16 953-200-3y furnace. The problem is they did not send a wiring diagram and won't. Can anyone tell me h ... read more |
mto7464
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Replies (2)
Re(1):Honeywell to white rogers gas valve wir - marchvac
Re(1):Honeywell to white rogers gas valve wir - Xenos
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| "continuous fan " , posted Fri 17 Feb 20:47
the fan on my roof mount Paynme PH1P runs non-stop. What is the cause and how do I fix it. ... read more |
fseater
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Replies (2)
Re(1):continuous fan - Weber
Re(1):continuous fan - Archangel
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| "Exhaust blockage ? " , posted Thu 16 Feb 22:54
Thanks for your reply .So I probably have exhaust blockage or a faulty switch ? These switches should reset when I turn off power, but after I do , the jets still wont ignite . ... read more |
sochilly
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Replies (1)
Re(1):Exhaust blockage ? - marchvac
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| "testing hi pressure switch " , posted Thu 16 Feb 22:19
I have a lennox G24M gas furnace . The blower is working but the jets wont ignite. The LED flashes 4 times indicating primary/secondary limit or flame rollout switch has opened . The flame rollout swi ... read more |
sochilly
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Replies (3)
Re(1):testing hi pressure switch - marchvac
Re(1):testing hi pressure switch - blackNgold
Re(1):testing hi pressure switch - Xenos
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| "need feed back " , posted Thu 16 Feb 19:29
I have a 15 year old carrier heat pump/ ac package unit in my house. I am replacing it with a new ducane 2 ton heat pump/ac unit(13seer). I think my old unit is 8-9 seer. My first question is ducane ... read more |
doityourselfer1
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Replies (3)
Re(1):need feed back - Archangel
Re(2):need feed back - doityourselfer1
Re(3):need feed back - dumbapprentice
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| "TRANE CVAC027 " , posted Wed 15 Feb 22:57
Dear ALL,Anyone still have the TRANE CVAC 027 or 032 w/ classic black control panel (made in USA) control and starter wiring diagram? Can send to me or not? ... read more |
can
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Replies (1)
Re(1):TRANE CVAC027 - chiller guy
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| "data aire head pressure problems " , posted Fri 10 Feb 11:04
I HAVE 9 DATA AIRE UNITS IN A TELECOMM SITE . 35 TON GLYCOL SYSTEM WITH PLATE EXCHANGERS. NO LIQUID SOLENOIDS NO RECIEVERS.IT HAS2 COPLAND SCROLL COMPRESSORS.TXV,S..THE SYSTEMS RUN PERFECT GOOD SUPERH ... read more |
phillw65
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Replies (3)
Re(1):data aire head pressure problems - kdmman
Re(1):data aire head pressure problems - Archangel
Re(2):data aire head pressure problems - phillw65
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| "Arcoaire " , posted Thu 9 Feb 23:33
Mod#GNJ100n16a1SER#L961414018RPJ IIHad a call,Gas valve chatters after about 10 min run time 27v at valve,1)found 8pin connector loose chatter still came back first thought was gas ... read more |
shawnml9
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Replies (1)
Re(1):Arcoaire - kevink
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| "Goodman furnace manufacture date? " , posted Wed 8 Feb 20:48
Insurance guy here. Need help to figure out manufacture date of an oil fueled multi-position warm air furnace, manufactured by Goodman Manufacturing Corp of Houston, TX. House built in 1924, current o ... read more |
rlanes
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Replies (1)
Re(1):Goodman furnace manufacture date? - pilight
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| "Water Balancing " , posted Wed 8 Feb 06:47
I want to gain more knowledge on water balancing in commercial applications. Say a chilled water plant with 2 chillers and 50 air handling units and 2 pumps.Has anyone got any suggestions on ... read more |
rocketrod71
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Replies (2)
Re(1):Water Balancing - brian626
Re(1):Water Balancing - brian626
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| "Humidifier wiring to furnace control panel " , posted Tue 7 Feb 21:46
I just installed a new Generalaire 1137 power humidifier, replacing an Aprilaire 112. My furnace is a Carrier 8000. I installed the GA in the same manner as the Aprilaire. Two wires came from the hu ... read more |
mcamp18
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Replies (1)
Re(1):Humidifier wiring to furnace control pa - thero
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| "Oil Quantity " , posted Fri 3 Feb 08:26
Without name plate data telling how much oil is needed in a system, how is the Quantity determined? (Working on a Goodman PH 060) ... read more |
bfisher2842
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Replies (2)
Re(1):Oil Quantity - Archangel
Re(2):Oil Quantity - bfisher2842
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| "PTAC " , posted Wed 1 Feb 18:24:
I would need help to select a PTAC or PTHP unit. My questions are: In New York City should I go with a PTHP or PTAC? Are PTAC in general quieter than PTHP? Does anybody know who really makes quiet uni ... read more |
mycor
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Replies (1)
Re(1):PTAC - shawn T
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| "Orange wire in non heat pump package unit? " , posted Wed 1 Feb 10:21
Have you seen any non heat pump system ever require connection to O (or B) for heat?I'm finishing up wiring in a new thermostat with a gas/electric Lennox rooftop package unit. GCS16 series. ... read more |
Quakeserver149
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Replies (1)
Re(1):Orange wire in non heat pump package un - evildberg
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| "CFM LOSS IN 36" SPIRAL DUCT " , posted Tue 31 Jan 15:50
I AM HAVING A PROBLEM TRYING TO FIND THE VOLUME LOSS IN A 36" DIA. STEEL SPIRAL DUCT WITH 13,500 CFM SUPPLY GOING THROUGH 80' LENGTH AND STATIC PRESSURE 0.20.THANKSRYAN ... read more |
BIGWALT70
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Replies (4)
Re(1):CFM LOSS IN 36 - Xenos
Re(1):CFM LOSS IN 36 - Dog Biscuit
Re(1):CFM LOSS IN 36 - acefurnacefixer
Re(1):CFM LOSS IN 36 - Archangel
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 | "Gas Pressure " , posted Tue 24 Jan 23:28
Heres a stumper...I recently installed a Rheem water heater m#HE45-199. For those of you not aware, it is a 95% AFUE, stainless steel tubular heat exchanger that recovers approx. 300g/hr @ 90 ... read more |
MrMetti
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Replies (7)
Re(1):Gas Pressure - kosmo
Re(1):Gas Pressure - Dog Biscuit
Re(1):Gas Pressure - Superdave
Re(1):Gas Pressure - kevink
Re(2):Gas Pressure - MrMetti
read more
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| "Switch from mercury Tstat to Electronic " , posted Tue 24 Jan 19:58
I think I've figured out the proper wire connect sequence, but would appreciate a 2nd set of eyes to look it over.In the shop, we are using a Honeywell T874D1165 mercury switch based two stage ... read more |
Quakeserver149
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Replies (7)
Re(1):Switch from mercury Tstat to Electronic - Quakeserver149
Re(1):Switch from mercury Tstat to Electronic - Archangel
Re(2):Switch from mercury Tstat to Electronic - harpo
Re(3):Switch from mercury Tstat to Electronic - Quakeserver149
Re(4):Switch from mercury Tstat to Electronic - harpo
read more
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| "Unit twinning question " , posted Mon 23 Jan 15:48
My church currently has a 20-ton Trane packaged unit with gas heat that they use to serve their sanctuary. They are adding on an activity room the same size as the sanctuary. I have ran a load for the ... read more |
rnelson
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Replies (3)
Re(1):Unit twinning question - shawn T
Re(1):Unit twinning question - MrMetti
Re(2):Unit twinning question - rnelson
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| "relay, combustion for an Intertherm furnace " , posted Mon 23 Jan 00:08
This is for a moble home, and yes I know this is the comm. service forum, but I am hope someone can help. All the info is here: http://we ... read more |
nabullet
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Replies (1)
Re(1):relay, combustion for an Intertherm fur - Archangel
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| "burner just shuts off " , posted Thu 19 Jan 20:12
I am working on a York model D6CG060 rooftop unit. The flame on the burner just shuts off. There is times the burner will work fine all day then out of no ware the burner shuts off the only way to get ... read more |
cbollin
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Replies (4)
Re(1):burner just shuts off - tinner73
burner just shuts off - cbollin
Re(1):burner just shuts off - Evildberg
burner just shuts off - cbollin
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| "Warehouse HVAC " , posted Wed 18 Jan 12:27
Hi, I'm a student in civil engineering. It's my last semester and in a team project we must do the structural design of a warehouse (2 buildings : 120*80 and 90*90 connected).We need to consider ... read more |
Alexis
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Replies (2)
Re(1):Warehouse HVAC - pacserve
Re(1):Warehouse HVAC - harpo
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| "carrier roof top " , posted Wed 18 Jan 11:11
when the sparking starts the 24 volt to the gas valve goes crazy no cosistants i have 24 volts to the control and if i disconnect the sparker line then the voltage stays ok. suggestions ... read more |
midlam
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Replies (1)
Re(1):carrier roof top - Archangel
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| "Berry Precooler R22/R404A Retrofit? " , posted Tue 17 Jan 12:55
I'm new here, so kick me if I offend anyone. Here is why I am posting here. The condensed version of this is: Would it make sense to retrofit a 40 ton R22 system running at around 0 deg F evap te ... read more |
Melon Launcher
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Replies (1)
Re(1):Berry Precooler R22/R404A Retrofit? - Archangel
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| "Maple Chase Thermostat " , posted Sun 15 Jan 07:27
I have a Maple Chase Thermostat. When i set it to the desired temp (which would be a couple of degrees above the actual temp), instead of the heat kicking in, it resets itself down to the actual temp ... read more |
tlterry
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Replies (3)
Re(1):Maple Chase Thermostat - acefurnacefixer
Re(2):Maple Chase Thermostat - AZboyinWI
Re(3):Maple Chase Thermostat - Evildberg
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| "Model and Serial Numbers " , posted Fri 13 Jan 12:37
Can anyone please help me with reading a few model and serial numbers? I am working on a project at work and I am unfamiliar on how to determine tonnage and age.Here are some examples:
read more |
stan1999
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Replies (1)
Re(1):Model and Serial Numbers - Rustymike
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