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Hot Topics: Boiler Problems | DoItYourself.com



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Original post: Weird hydronic issue with 2 zone boiler system

kirmool Member

Folks,

I have a Weil-McLain Gold CGT boiler. I have a strange question that I can produce every time. The system has two zones (upstairs and downstairs) and sanitary with a single Taco 007 circulator pump.

When both zones require heat simultaneously, the nerve floor will never be heated. As soon as I prevent the upper floor from calling for heat downstairs, it starts to heat up. I have replaced the zone head and zone body but the problem still remains. My circulation pump was replaced about a year ago.

My house is on a concrete slab, so some of my Zone 1

pipelines go under the slab. I'm starting to think about whether the boiler was properly movable when installed. I have no idea when it was installed because I bought the house with it ten years ago. I never really noticed it until a few winters ago. But now it drives me crazy.

I have attached some pictures of the system for your review.

Thank you!

  boiler system in basement

  boiler system in basement

  boiler element

PJmax Group moderator

Welcome to the forum.

Thread moved to boiler forum.

I reoriented / resized your images.

One thing I see that stands out is oven smoke in the wall?

Is there a chimney in there?

It should not be open.

What is system pressure?

kirmool Wire Starter

The smoke of the boiler goes directly outside. There is no chimney there, as it is an outer wall.

The system pressure is 15 PSI.

lawrosa Super Moderator

That boiler has a mixer I think often caused problems. Give me a moment.

lawrosa Super Moderator

That boiler also heats your hot water. I know the system is problematic. I'm trying to find documentation. Here is the manual.

lawrosa Super Moderator

Testing the 3-way valve.

kirmool Thread Starter

I have ordered a replacement cartridge for 3-way valve and I should get it within a few days. I have an extra actuator for this 3-way valve because it failed me twice there- in I had no hot water. Thus, I had one in standby. I replaced it with the old one and monitor the problem for a couple of hours but no dice. I'll wait until the three-way valve cartridge comes in and replace it and see how it shakes out.

I will report back when I changed the cartridge .

In addition, the position of the 3-way lever is always down even when the tankless t-state requires heat.

kirmool Thread Starter

I got the part today and did the repair. She is buzzing nicely now! Both zones now provide enough heat even when running at the same time.

Getting the existing cartridge out was a big pain but in the end saved some elbow grease and the bow blade the day.

Many thanks to you Lawrosa and PJmax.

 old boiler parts

 replacement of boiler

law rose Super Moderator [19659005] Hey man glad you fixed … Yeah, they're hurt. I don't see too many of these boilers anymore. I worked on my fair share

PJmax Group Moderator

Good job. Thank you for knowing how you did it.


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