1st time winterizing 2022 Greyhawk 27 U

[JROtexas]

I've searched here and read through the manual, but it seems to only address a water heater with three valves, and mine has only two. It has 'cold in' and 'hot out'. I'm guessing they should both be closed, and the heater tank drained from outside. Anything else before I start sending the pink stuff through the lines? Your advice welcome - and I'll update when it's over. Cold spell on the way.
Thanks.

 

[stu stoner]

If I am reading the post correctly, how will you then get antifreeze thru the hot water lines that are after the water heater....or am I missing something? Typically there are three valves and a bypass so that you can pump antifreeze thru the hot water lines.

 

[Glamper64]

You're right about the HWT mine only has two valves (some have three) close them and drain the tank. Now open the low point drains and all the faucets to drain the system. I blow out the lines via a compressor at the city water in connection to make sure all water is gone but you don't have to...don't forget the outdoor shower/kitchen/toilet. Set compressor @ 35-40 psi. if you blow out lines. Now close every faucet/low point drains and pump in antifreeze via water pump from hose in jug of antifreeze until pump stops. Now open furthest away faucets one at a time and every other faucet until a nice flow of pink is seen. You should also remove the washer/screen at city water inlet and push a back flow valve button till antifreeze squirts out. I skip this step because I blown out the lines first. Pour a little more antifreeze down sink/shower traps. Leave about 3"-4" in toilet. That should do it...you should also remove your battery and put in on a tender at home for the winter.

 

[dvspl]

Good advice from Glamper64. Just turn both valves toward each other and pump the antifreeze through. The two valve system seems to be replacing the older three valve system. Here's a good article on the topic that includes diagrams of how it works: https://rv101withmarkpolk.com/2019/10/24/understanding-rv-water-heater-by-pass-systems/

 

[JROtexas]

UPDATE: the 2022 27U has a 2-valve system, and I've figured it out now. While the manual doesn't specifically address 2-valve systems, the solution is intuitively obvious after studying the set-up.
Thanks to you responders, especially dvspl for the link with diagrams.

 

[Glamper64]

Yes it's quite obvious once you get it
What's confusing to people sometimes is that it's not really a shut off but more of a diverter. The 2 valve simply diverts the water into a pipe instead of the HWT...follow the water
When you think about it, the 3 valve seems silly really

 

[Mikemc423]

Yes it's quite obvious once you get it
What's confusing to people sometimes is that it's not really a shut off but more of a diverter. The 2 valve simply diverts the water into a pipe instead of the HWT...follow the water
When you think about it, the 3 valve seems silly really

In the Coleman popup I owned, there was a bypass tube. I would remove the in and out from the heater tank and connect the bypass tube to those connections. Sounds like the same idea here.

Also, I always put the pink stuff in my holding tank and pump it from there. I couldn't figure out how to pump it from the jug. lol
This works, though.