Joined on November 8, 2009
Last Post on November 20, 2013
@ 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.
@ March 10, 2013 1:27 PM in Gas light partsi was able to find the parts from a company called modern home products,and then bought them locally.they worked perfect.thanks to all
@ March 10, 2013 1:22 PM in adjusting the air on a power flame gas burnerdoes anyone know how to adjust the air intake on a powerflame model# fdm 225 gas burner? i have attached some pictures of the burner in question,and have contacted the manufacturer and they were of little help,they just kept saying yes to everything.it was as if they were unsure.it has a damper on the intake side that is attached to the mod.motor it opens as the motor, which is linked to the gas valve turns.the problem is unless the burner is in high fire,which is rare,the buner produces too much co.the manufacturer says to undo the setscrew on the mod. motor and open it that way,that does not seem right to me,but i am unsure as well. thanks to all
@ March 1, 2013 7:15 PM in Gas light partsDoes anyone know where to get parts for gas lights that you would have installed at a house? I have a customer that has one that is about thirty years old, that there is no manufacturer or make on. I am looking to replace the control knob that is broken, if the part or rebuild kit is available.thanks to all.
@ February 25, 2013 7:14 PM in underground ductworkthanks to all. the duct is being used for supply air from a gas fired furnace into an addition on a house.i found it in the imc code 603.8,i am going to make a copy of this part of the code,and send to the builder,and then i will get a cutsheet on the duct to show the homeowner that this is the only thing that can be used in the ground.at this point i would rather lose the job,then do something that is going to cause a code or health issue.you are right there is no amount of money worth that as there is always another job to do. thanks again
@ February 25, 2013 1:45 PM in underground ductworkdoes anyone know what type of ductwork is suitable to be installed in the slab (underground) we have a job that we have given them a price on transient ductwork (plastic duct with a lining on the outside that is made to go in the ground) the customer balked at that price and the builder is saying that that type of duct is not needed and regular sheet metal duct is ok.i have told them that i do not feel comfortable installing anything but the plastic ductwork,because once it is in the slab,there is no turning back.i have also gone back on jobs with regular duct underground where it has filled up with water.i can't find anything in the international mechanical code that addresses this,and did not know if anyone knew of an ashrae standard for this.any assistance would be very helpful. thanks to all.
@ February 5, 2013 10:24 PM in ductwork in slabdoes anyone know the current standards for installing ducts in a concrete slab? we have a job that we are installing transit duct (duct with a coating that makes it suitable to be installed in the ground) i looked in the imc,and all it says that ducts should be suitable to be installed underground,and in acca manual d there is nothing that mentions anything about installing ducts in a slab.thanks to all
@ February 2, 2013 8:11 PM in schemenauer unit ventilatordoes anyone know if parts or coils are still available for schemenauer unit ventilators originally made in holland,ohio? i have two that i need to replace the hot water coils in them.thanks to all
@ January 30, 2013 10:35 PM in base board heat thermostatdoes anyone make a line voltage,electric heat thermostat that is digital? most of the ones that i have seen just have a temperature scale or a wamer-cooler scale.thanks to all.
@ January 11, 2013 11:14 AM in Type of glycolDoes anyone know of an instrument that can determine what type of glycol is in a system? I have a refractor meter that tells the freeze point, but it does not tell the type. Thanks to all.
@ January 10, 2013 10:31 PM in parts for this valve available?it is a trane valve.thank you for your help.does anyone know if anyone still makes a valve like this or can i just replace it with a hoffman type 185? thanks again
@ January 10, 2013 8:38 PM in type of system?with a system that has cast iron rads,shutoff valves located at the top of the rad,with just a return union on the outlet,no trap.is this a vapor/vac.sytem?the system has vents located at the end of each return.also a radatior supply valve on a two pipe steam sytem can it be modulated to control the amount of heat the radatior puts out? i thought that on one pipe system this will effect the flow of condensate that returns to the boiler,but was unsure about a two pipe system.thanks to all.