DIY Chatroom Home Improvement Forum

DIY Chatroom Home Improvement Forum (
-   HVAC (
-   -   Bleeding my heating system 1-2-3 (

bwoo 12-31-2006 02:48 PM

Bleeding my heating system 1-2-3

Just wondering is there a "preferred" or "right" way of bleeding my hydronic heating system?

I see valves on the supply end, and I could also bleed from my return side (but if I do that I bleed the whole system).

Also, is the proper way to shut off the supply and/or the return?

Thanks in advance!


trollmastergeneral 12-31-2006 03:02 PM

I can help with your problem but have a couple of questions first.What presure is your boiler at curently and does it have a presure reducing valve on the water supply line,or due you have to fill it manualy.

bwoo 01-01-2007 09:16 AM

The pressure is at 25psi. And yes, it does have a pressure reducing valve

trollmastergeneral 01-01-2007 10:17 AM

Are your boiler drains on the supply or return lines. Isthere shut offs on supplys and returns. A picture sure would help. Your presure should be around 15 psi .Is your expansion tank full of water?

bwoo 01-01-2007 10:59 AM

i'll post a picture in the next post. however, I actually removed all my expansion tanks in the hope of reducing my electric bill. i had another post in which i was asking about glowcore. do you think the removal of my expansion tanks make a difference?

trollmastergeneral 01-01-2007 11:09 AM

Yes that is most likely why you are running at 25 psi. Check your presure reducing valve it will say 15 psi. Your t&p valve will open up at 30 psi. When you heat up the water it expands this is why you need the expansion tank.:eek: Did you replace your glowcore aka glowlesscore:laughing:

#CARRIERMAN 01-01-2007 11:15 AM

Hi bwoo

If you go to page #9 and find the post Bleeding air-Hot water system by Dragon I laid out some pretty specific details in this one. If you need any help past that let us know. If you can get a guy by the name of mdshunk involved he is very intelligent. I have not seen him on here for a while though. Let us know and we will help you through this.

Good luck

bwoo 01-01-2007 12:43 PM

2 Attachment(s)
no i didn't replace them. instead, i took them out of action. i'm posting two diagrams..

This first one i call 2006
Attachment 494

And this second one i call 2007
Attachment 495

All I did was take the glowcores out of action. Based on this, do you still recommend that I drop the PSI to 15?

My major issue is this.. on the 4th floor (Zone 4), i can get the supply to be really really hot, but on the return side (at the air handler), it is only luke warm.

Do you recommend that I put the glowcores back into action?

bwoo 01-01-2007 12:45 PM

Thanks for the tip. It's a long post so I've printed it out to read. vbmenu_register("postmenu_28390", true);

bwoo 01-01-2007 12:45 PM

trollmastergeneral and #CARRIERMAN,

do you guys work as professional HVAC engineers? if so, which geographies do you cover?


bwoo 01-01-2007 12:59 PM

just realized something - trollmastergeneral, when you mean expansion tank, you're referring to my glowcores right?

bwoo 01-01-2007 01:22 PM

as for my boiler, it's a Laars Endurance model EBP which is described by Laars as:


This appliance is a low pressure, direct
vent, hot water boiler that provides priority domestic
hot water on demand as well as hydronic space
heating. The unit has a twenty gallon tank which holds
boiler water (as opposed to domestic water storage).
The boiler water is kept hot at all times to
provide immediate response to call for heat or
domestic water. Domestic water is heated by the boiler
water through a stainless steel plate heat exchanger.

So, do I still need the glowcores?

trollmastergeneral 01-01-2007 01:27 PM


Originally Posted by bwoo (Post 28408)
trollmastergeneral and #CARRIERMAN,

do you guys work as professional HVAC engineers? if so, which geographies do you cover?


I am not a engineer but I am a licensed contractor in michigan.I specialize in service because I love service.I love boilers and steam heat because it is a specialty item not many people know how to repair these systems. I have been in HVACR since 1987.I have owned my own buisness for the last 11 years ago. I am not against home owners who need help either.

trollmastergeneral 01-01-2007 01:33 PM

I see that zone 4 has a pump is this the zone is not working. Which zone is not working. Is this the only zone not working?

trollmastergeneral 01-01-2007 01:44 PM

This is getting a little confusing. What is the original complaint that made you want to bleed the system.:huh:

All times are GMT -5. The time now is 10:57 PM.

vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

Search Engine Friendly URLs by vBSEO 3.6.1