Weil Mclain Ultra 155 not condensating.

Users who are viewing this thread

wtxing

New Member
Messages
4
Reaction score
0
Points
1
Location
Tioga county NY
Installed Ultra `155 with factory 1 1/2 header. Came with Taco 0014-F1 (32 gpm max) circ pump. Attached 1 1/4 copper to input and also to output of header. My heating system has several zones all driving the return water by Gruundfos pumps with 17 gpm rating. Return water temp at the 1/4 inlet pipe is 100 deg. The temp as it enters the boiler, after the Taco pump, is the same as the output temp 160 deg. I suspect the the Taco pump is over powering the return water and looping thru the primary loop back to the boiler input. Asked Weil Mclain support if I could change the Taco with the same Grundfos used in my heating system and they said no. Any suggestions on how the solve this besides replacing all my heating system pumps with ones that have the same gpm as the Taco ?
 

Fitter30

Well-Known Member
Messages
5,169
Reaction score
1,023
Points
113
Location
Peace valley missouri
Inlet temp 140° or more will not condense efficiency drops to 87%. Take a few pics of the boiler and related piping so we can see how system is piped. Grundfos pump model? What are the heat emitters?
 

wtxing

New Member
Messages
4
Reaction score
0
Points
1
Location
Tioga county NY
This is my design. Circ pump at input of propane boiler is Taco 0014 all other zone circ pumps pumping return water ar Grundfos 15-58FC. As I said before I believe the primary loop in the boiler header powered by the TAco is overpowering the return water powered by the GRUNDFOS.

mydesign new7.jpg
 

Attachments

  • Heating design.JPG
    Heating design.JPG
    60.1 KB · Views: 30

John Gayewski

In the Trades
Messages
4,832
Reaction score
1,556
Points
113
Location
Iowa
If your theory is correct you should be able to close the valve on the output of the primary pump as your pump should be installed with isolation valves. This won't hurt the pump but will restrict the flow.
 

Fitter30

Well-Known Member
Messages
5,169
Reaction score
1,023
Points
113
Location
Peace valley missouri
It seems like the Taco 0014-F1 pump may be pushing too much flow, causing the water to bypass the boiler. One solution could be to install a flow restrictor or balancing valve in the primary loop to limit the flow and prevent the looping issue. You could also consider using a different pump with a lower flow rate that better matches the system’s requirements. If replacing all the system pumps isn't ideal, adjusting flow rates through other means like these could help balance the system without a full pump overhaul.
Lp boiler are the two tees are the closer than 12" center to center? Fin tube really doesn't start to heat till 140° water and might take up to 180° depending how they were designed. How are you lowering the water temp for basement and 1st floor?
Wood boiler pump move pump to boiler wood inlet get rid of that whole pipe. S1 & S2 lines, S3 line back to back tees. Need a diagram just tell me.
 

wtxing

New Member
Messages
4
Reaction score
0
Points
1
Location
Tioga county NY
Header Tees are 2.5 inches apart center to center. If you look at my diagram above you will see upstairs baseboad is fed prior to hot water going thru basement and 1st floor mixing valve that supplies all othe radient zones. Dont understand your last sentence. Look at diagram above looking at symbol ledend in lower left of diagram.
 

Ron

New Member
Messages
5
Reaction score
0
Points
1
Location
Mesa, AZ
If the Taco is pushing too hard, it might be worth checking if you can adjust the flow rate on the Taco pump or even look at a speed control option. Sometimes, throttling down the flow can help balance things out. If that doesn’t work, consider adding a flow check valve to prevent the backflow issue. And hey, don’t hesitate to consult with an HVAC pro; sometimes a fresh set of eyes can pinpoint issues you might not notice!
 
Top
Hey, wait a minute.

This is awkward, but...

It looks like you're using an ad blocker. We get it, but (1) terrylove.com can't live without ads, and (2) ad blockers can cause issues with videos and comments. If you'd like to support the site, please allow ads.

If any particular ad is your REASON for blocking ads, please let us know. We might be able to do something about it. Thanks.
I've Disabled AdBlock    No Thanks