Joined on November 8, 2009
Last Post on March 5, 2014
@ March 5, 2014 8:39 PM in computer room heat gain questionWhat is that, and what is the differance and using a regular volt amp meter to determine the watts consumed by this equipment, and it's heat output?
@ March 5, 2014 7:23 AM in computer room heat gain questiondoes anyone have a rule of thumb as to how much heat gain there is from a standard desktop computer, like you would have in your house? i have a job where the customer has moved their call center to an interior room within in their space. in this office there are four occupants, and six desk top computers. the size of the room is 280 ft2, 3920 ft3, the space has no exposed walls, and is served by a rooftop unit that serves other areas that require heat, and cool, where this room will only need ac year around. the six desktops are all the same model where on the back it shows 5 amps @ 120 volts. that would add up to 600 watts, and 2,046 btu's each. is this the best assumption to make as to how much heat these computers put out, or does anyone know a better way to go about this. thanks to all.
@ January 26, 2014 9:33 PM in replacing condensing gas heat exchangerthe only reason I replaced the heat exchanger was because it was under a lifetime warranty, and it was for a family member that is trying to sell their house. I am aware that the labor credit tops out at twenty years, and this furnace is well beyond that. replacing the secondary heat exchanger was a piece of cake, and I found out that it can be slide out without messing with the primary, however I would suggest to anyone that has to do this, if there is any doubt about the primary cells to go ahead and replace them, which I did because they are also under a lifetime warranty. thanks again
@ January 22, 2014 8:54 PM in replacing condensing gas heat exchangerdoes anyone know if the secondary heat exchanger on a carrier model #58sxc furnace can be replaced without removing the primary heat exchanger? I have a family member that has one that is leaking, and I have ordered the replacement heat exchanger, which unfortunately came with a lifetime warranty, and am planning on replacing both even though through testing it only appears that the secondary is cracked. I have never replaced one of this model before, and am just going by an exploded view of the unit. i tried to convince them to replace the furnace, they would get a better warranty, and all new parts, but they chose to replace the faulty part. any input would be appreciated. thanks to all.
@ January 7, 2014 11:12 AM in prolem with lennox pulse furnaceThe kidney shaped holes face in towards the heat exchanger, that the way they are facing. Thanks
@ January 7, 2014 7:53 AM in prolem with lennox pulse furnacethanks to all, i have the pulse furnace heat exchanger test kit and have used it several times.this furnace's heat exchanger seems to be ok, but i feel at this point replacement is the only option. i was able to get it to fire when i went back to measure up for a new furnace. this furnace's has become less reliable that replacement is the best option. the only saving grace is that this house has four systems, and when one is not working sometimes it is not even noticable.
@ January 4, 2014 11:00 PM in prolem with lennox pulse furnaceI installed the tune up kit today, and the pulse furnace will not fire at all. With the old parts it would fire about once every three times, now it does not fire at all. You here the sparking and see manifold pressure, however it does not fire. I do not know what do at this point, as everything I have done to this point has resulted in a dead end. I can't think of anything else to chek or replace.
@ January 2, 2014 10:58 PM in prolem with lennox pulse furnaceThanks for the response, I ordered the tune up kit today and am going to install it as soon as the kit arrives.
@ January 1, 2014 7:54 PM in prolem with lennox pulse furnacehappy new year to all. I had a call today on a lennox pulse furnace m# g140 4/5-100-6. the ignition model was off on lockout with a code of no flame sensed. I reset the furnace at the thermostat, and it fired off on the first try. upon checking the manifold pressure it was dead on (2'' of w.c as stated on the nameplate to be the maximum) and the flame signal was right where it has been in the past (4.5 ua) I have worked on this furnace for several years, and recorded the readings of the manifold, flame signal, temperature rise and combustion test readings. all seemed to be normal, and was right where it was when I did the maintenance on the furnace back in October. upon cycling the furnace several times, about once every three times, it did not light although you can hear the sparking, and read the correct manifold pressure at the outlet of the gas valve. I confirmed that the combustion blower is operating, and turns off after flame is established, which is normal for pulse ignition. the combustion blower, spark plug, flame sensor, and cables were all replaced on this furnace back in 2009, and appear to be in good condition, and not the cause of this intermittent ignition problem. the only thing that I can come up with that could be the problem where it just doesn't light off is if one of, or both the gas flapper and the air flapper valve are not opening when the need to. i have never replaced either of the flapper valves on this furnace, and am posting this to see if anyone else has come across this problem where a pulse furnace every couple of cycles just doesn't establish ignition. if I locked out once a heating season, that could be lived with, but it is now more often not firing off then firing off. thanks to all I know this is a long post
@ December 18, 2013 10:51 PM in mr. slim trouble code?does anyone know if a Mitsubishi mr. slim unit with the following information:
model# msz09un (indoor unit) model#muz09un (outdoor unit)
has a trouble code if the green light on the indoor unit blinks five times, then pauses for two seconds, then blinks another five times. does this indicate a trouble code, and if so what is it? I have not been to this site, and am trying to troubleshoot this remotely. thanks to all in advance.
@ December 13, 2013 9:16 PM in rydlyme descalerhas anyone used rydlyme descaler, and if so what did they think of it compared to some of the products that nu-calgon makes. we have a job where we have to clean about twenty 50 ton water cooled condensers that are not rod able, and need to be pumped clean. I have never used rydlyme but it is getting a lot of advertisement in our area. thanks to all
@ November 20, 2013 8:32 PM in cleaning a plate and frame heat exchangerMostly dirt and other stuff found in an open cooling tower system
@ November 19, 2013 7:39 PM in cleaning a plate and frame heat exchangerdoes anyone know the best mild detergent to use when scrubbing down the plates of plate and frame heat exchanger? the manufacture recommends using nitric acid, and water. I do not want to use any acids if necessary, because we would be scrubbing them down on the roof of the building (rubber roof) thanks to all
@ November 18, 2013 8:17 PM in info. on york self containedI am looking for an o&m manual on a York self contained unit model# dvw050.this unit is only six years old, and I have tried going through the local York office with no results. thanks to all
@ November 10, 2013 12:03 AM in beckett cleancut pumpwhen bleeding a beckett cleancut oil pump that has a solenoid on it, should you get oil out of the bleeder when the bleeder is opened (pump running), even if the solenoid is closed? thanks to all
@ September 25, 2013 10:13 PM in nfpa 54/common vent sizingdoes anyone know which nfpa 54 table is used to size the common vent flue pipe size for category 1 furnaces? we have a job where we are doing an oil to gas conversion,and would be install five 120 mbh category 1 furnaces,relining the chimney and i need to find out how to size the common vent that the five furnaces would tie into.they give some examples in the book,but i did not see any that had five furnaces.thanks to all
@ August 28, 2013 10:53 PM in txv too smallI was working on a carrier water source heat pump today (r410a) m#50 hq installed in april 2013.there was a certified air balance done on the unit, and airflow does not appear to be an issue.the problem is both circuits (6 ton two stage unit) are running with low suction pressure (95-100 psi) to the point where the outlet of the txv starts to ice up and the unit goes out on freeze protection. this occurs on both circuits. the charge has been removed and weighed back in to what is on the nameplate. even though this is a six ton unit with two isolated three ton circuits, the txvs are only rated at two tons each. does anyone else find this odd that you would have a six ton unit with txvs only capable of supplying four tons of refrigeration across the evaporator coil. both txvs seemed to be maintaining a good superheat (12-15 degrees) in the evaporator, it just seems that the evaporator is being starved of refrigerant, and the txvs cannot open any further
@ August 5, 2013 7:28 PM in chilled water coil delta tdoes anyone know if there is a formula to find what the air temperature drop should be across a chilled water coil, if the gpm,airflow,and water temperature drop is know? thanks to all
@ July 25, 2013 10:07 PM in drier installed backwardswhat can happen if a liquid line drier gets installed backwards? with the arrow pointing towards the condenser rather then then the evaporator. the drier in question is a sporlan 163s.i got a call for a check up on a three year old system, and found that the drier was installed backwards. the unit is a 410a unit and appears to be running fine with normal pressures, superheat, and subcooling.
@ July 23, 2013 9:52 PM in zerol ice reducing system capacitythanks for the response. there is next to no separation between the condenser and the evaporator. the condenser sits at ground level, and the evaporator is in the crawl space. about 15' of line set, no insulation missing off the suction line. the longer the system runs, the lower the superheat gets after about an hour and a half it's gets to around 10 degrees.
@ July 22, 2013 8:58 PM in zerol ice reducing system capacityI got a call on a one and a half ton trane split system heat pump, that may be undersized for the space and that was the reason for the call.while I was there I recorded the following readings:
suction-85 discharge-190 sh-20 sc-2 indoor wet bulb-71 outdoor dry bulb-87 indoor dry bulb-81, delta t across evaporator-14 delta t across the condenser- 8
the thing that seemed not right with this system was the low condenser split (condenser coil was clean and the head pressure is normal),and that it took nearly 30 minutes of run time for the superheat to come down and the evaporator to start to produce condensation.
when the system was install someone put zerol ice in the system, and I was wondering if anyone has had experience with this, and was also wondering if this was what took the system so long for the superheat to come down. i have never used this product, and am thinking that this may be effecting this system's performance or am I overlooking something here
@ March 10, 2013 9:33 PM in adjusting the air on a power flame gas burnerthanks for the help,however the pdf that is online is the same one that is shipped with the burner.it does not explain how to adjust the air.i have all the combustion test equpment necessary to work on this burner as i have before.i was just wondering if anyone had experience with powerflame,that's all.