Weil McCann GV90

Crissie

This is a conventional cast iron boiler with a secondary stainless steel heat exchanger to allow for condensing and direct venting through PVC. Has anyone had experience with this, any feedback? Do you know if we would need to worry about boiler protection or supply water temp? Thx!!

EBEBRATT-Ed

Not familier with the boiler but the manual say the water temp sensor and controls included with the boiler will provide boiler return temp protection....it's already built in.

You can download the manuals on Supply House .Com

HVACNUT

I service a few of them.
That boiler has both an internal system circulator and an internal bypass circulator that mixes hot supply water with the return water when RWT drops to 140° to prevent condensing in the cast iron section. 
I would pipe it (if more than one zone) primary/secondary as shown in the installation manual. 
I've not had too many issues with them. The internal circulators are both Taco 007 unless newer revisions have different. 

Tom_133

I love them, I also really liked the first versions without the heat exchanger on the outside.

Crissie

Tom_133 said:

I love them, I also really liked the first versions without the heat exchanger on the outside.

Do we really not need to worry about the water temps, either on the supply or the boiler protection return water temp? Thanks