Heating Help

Air

@ February 1, 2013 10:32 AM in Air lock

Are there automatic air vents on top of air seperators, if so they could be drawing air into system especially if your n.p.s.p ( net possitive suction press, ) at your pump goes below 0 psig.  I recommend all air vents on hydronic systems be valved off after initial fill and bleed.   pictures would be good

economite

@ January 31, 2013 1:32 PM in economite 150-c thermalcouple

Its been awile since I have worked on one of these, In alot of jobs the burner itself was supported by the stand as you can see, where the burner tube is attached to the boiler is sealed with refractory type cement which you need to remove to get burner out. The burner may be attached with clip style fasteners to the boiler, Before you remove the burner order some Greenpatch 421 cement  5 gals is about $65.00.  you will need this when reattaching the burner to seal the blast tube to the boiler. Alot of these old burners were set in place like this, now day burners come with mtg. plates and tube plates for most installs.   Before pulling burner check for an access panel to get to pilot assy. on back or side of burner, I used to have an I.O.M on this burner sorry could not find.

flue info

@ January 30, 2013 4:56 PM in A new section

Thanks I have all that, I mentioned it because I thought it would be a good topic

door switch

@ January 29, 2013 12:13 PM in No power coming to the circuit board

check your blower door switch

good idea

@ January 28, 2013 2:51 PM in A new section

I think one of the most misunderstood yet critical parts of our trade is flue sizing and application,  Maybe some info on flues can be shared as needed at this new category. I found the Selkirk co.  has great info.

Danfoss info

@ January 27, 2013 1:57 PM in Need help buying TRV

Check my post Feb. 9th   2012  good info
RJ

valve

@ January 25, 2013 5:20 PM in Is it easy to change a bleeder valve

Sorry should have been clearer, its 1/8 inch ball valve, male x female or use a 1/4 inch and reduce

auto vent

@ January 25, 2013 3:15 PM in Is it easy to change a bleeder valve

Thats an auto vent, you dont want that there, relplace it with a key vent, coin vent or 1/8 inch jomar valve ( ball valve).  you will need to drain the system press. and lower the loop temp. when the job is done you will need to vent and purge system. recommend you get a pro   not a job for a homeowner

schematic

@ January 22, 2013 11:06 AM in Multiple zone valve wiring.

Good schematics on line, look up taco 570 zone valve wiring

controls

@ January 21, 2013 8:05 PM in Staged pressure controls

This may help, Lattner boilers are used alot in spas and gyms for steam rooms

commercial

@ January 21, 2013 2:53 PM in commercial

Thanks Dan        I have 38 yrs exp in commercial boilers (low and high press ) as well as large recip. chillers,   large refrig systems and pneumatic controls. i am retired and have plenty of time to answer what I can

category

@ January 21, 2013 11:47 AM in category

Would anyone like to see a commercial hvacr category at the wall

noise

@ January 20, 2013 7:37 PM in niosy geothermal

Is it 3 phase, if so try changing rotation

uncharted territory

@ January 20, 2013 6:34 PM in Direct Exchange Geothermal

Reminds me of the solar hw systems of the 1970's  Alot of people with limited hvacr experience installing these systems.   I worked on 1 that utilized a well system, the refrig. systems would trip on high head press. when the grout material in the wells was dry,  worked ok when the ground around the well area was moist, after it rained. proper design and install is crucial.

vents

@ January 20, 2013 1:06 PM in 0013 taco circulator

Sorry I have mistated, I dont use auto vents on hydronic systems unless they have a shutoff valve before.  When piping up a hydronic coil I install shut off valves on the supply and return lines, a circut setter on the return, a control valve where used, and 2 petes plugs,    I pipe in tee with a ball or gate valve with a pipe x hose fitting at top of coil and drain valve at bottom of coil, this allows troubleshooting this coil for flow problems   I have always had the best results bleeding systems at the highest point in system, better to bleed with pumps off. I have used the purge technique to success when I did not have high points in system

vent

@ January 20, 2013 10:20 AM in 0013 taco circulator

Reminds me of a job years ago, AHU in attic area had no flow, installer had not installed valves on coil for venting air, we installed a saddle valve ( type used to hook humidifier to water line ) on the coil copper piping and were able to get out air stuck in the top of the coil, and get flow,   returned later in week an repiped, installing drains and high point air removal valves

vent

@ January 19, 2013 11:58 PM in 0013 taco circulator

One of the rules of the pipefitter   Always provide a way to vent the high points and drain the low points.   

sizing

@ January 19, 2013 11:39 AM in 0013 taco circulator

You need to start by checking pipe size to btu's, and TEL total equivalent length (pipe length + 50% for fittings), also press. drop through equip. When you have this you can use a pump curve ( selection chart ) to size the pump.   Remember in closed loop systems height is only considered in the cold fill pressure.  should be at least 5 psig at very top of your bldg piping.  Every 2.3 ft of height will equal 1 psig  .  In your case you need at least  26 psig plus 5psig = 31 psig. at your boiler.   In some cases relief valves need to be changed to higher press. setting.  I would get the cold fill press. up, and bleed top of system, try that first. you may need to install valves at the top of your system to get air out.

boileric

@ January 18, 2013 11:15 AM in BOILER SIZING...GAS , STEAM

whats the size of the old boiler, I ran into the same problem, I had to use size of old boiler and take in account that the old 1940 boiler had a side arm domestic water heater. I did put in a disclaimer in the bid

valves

@ January 17, 2013 6:19 PM in zone valve question

Not sure what style you have, the old WR zone valves had a stem assy that sat inside a valve body, after some time the stem would where allowing some flow through valve body causing overheating even though the zone was not calling for heat, One way to tell would be to isolate that zone by shutting it off with a gate or ball valve

duct

@ January 17, 2013 5:27 PM in electric duct heater

where does the duct go,  AHU ?  MA unit,   sometimes these would be installed to try to correct a miscalculation on original design or reheat of new zone that was added.

lock out

@ January 16, 2013 2:05 PM in Power Flame JR30A-12 locking out frequently

First thing   get an I.O.M. for burner.   what's it locking out on. may be a gas press. problem.  Pilot and rod can be cleaned.  You may need to pull the burner to check the diffuser plate. If your not familiar with this burner you may want to get a second set of eyes on it       pictures ?