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Since you guys showed me that the Weep Mizer output 2 has a 2 degree differential I'm going to use that with a contactor for the secondary loop. The aquastat will have the two pumps on it and it's rated for twice that. Thanks for all your help and preventing me many times in this thread from...

Two Takagi T-H3-DV-N units. Okay so if I use another 2400-45-3P in series on the primary loop it might work out fine. At 15 GPM they add up to 66 feet of head pressure. Maybe I'll get the bonus psi too. Lol.

The 0013 chart shows 29 feet of head at 7 GPM. Two of those would only be 58 feet of head and that is only about 25 psi, right? I'm really getting confused. 😂

Am I looking for 15-20 psi after the heaters to somewhat match the secondary loop? How do I know how much temperature rise my heaters will be running? You set the output to 105F but do you know the temp going into your heater? I'm guessing it is around 55F based on 7 GPM.

I understand the pump curve charts but don't comprehend the heater pressure drop curve very well. Isn't the pressure drop going to change with demand? The chart shows only 8 psi drop @ 5 GPM. It goes up to 12 @ 6 GPM. At 7 GPM it is still only about 12 psi or so. I need to regroup. :unsure:

I did some more calculations and I'm going to go with a Taco 2400-45-3P on the primary loop and one on the secondary loop. It's about the same cost as going with three 0013 pumps. I'm into this about $5K so far without the fittings that I'll buy locally as I put it all together. I'm sure I'll...

They are National Pride and we bought them used. Originally 10 position rotary switches and I converted them to 12 position bolt-on style. They are not even in the same place as they were originally. Then I installed a black flush dummy switch in the swiper, ran the wires out the back and...

On the secondary loop I calculated just the tubing runs and came up with about 23 GPM and 15 of head pressure. The 0013 is perfect for that if I don't count the extra head pressure for the manifolds and elbows.

I didn't think I'm going to use the buffer tank because we have little space for it without making it a difficult install. The air eliminators of course come in different sizes. The pump flanges come in many sizes also. The old copper is currently 2" and the manifolds are 1 1/2" which seem very...

Three of those pumps are close to $1,500 so I want to get it right the first time.

It's not exactly how I remember it happening but here is my thread on it. https://www.carwashforum.com/threads/cryptopay-not-settling-transactions.19349/

We had this issue several years ago and the transactions were "stuck" in the coordinator. I can't remember what we had did to fix it. It seems like we had to reset it with the button.

How do I verify that an 0013 pump is the correct size? I looked at an online calculator but it seemed over my head. We have 16 loops with 1/2" PEX. I have no idea how long the original loops are but I think the longest loop on the newly poured concrete is about 200'.

I'm not sure why my mind skipped over that. Lol. I think I need more sleep. This whole remodel is really taking a toll on me.

Still sounds like 1 degree to me. If LL is set to 33 then it turns on at 32 and stays on until it reaches 33 or higher again.

The wire run from the Weep Mizer is going to be about 40'. I think a 2 degree differential might be better on those 32 degree days. I guess setting output 2 at 34 (not sure if that's the HL or LL) degrees may accomplish similar results though. Our old system had only one pump and it ran all...

The stats that I'm looking at have 16 amp rating so I should be good there. If I used two of them, one for return temp and one for outdoor then I probably don't need any relays. All three pumps' 6 amp load would run through the outdoor stat and 4 amps through the one used for aquastat.

So are you running the full primary loop pumps' load through the auquastat?

I'm thinking of three relays. Relay 1 would control the secondary loop pump when it gets below freezing. Relay 2 would control primary loop pump. Relay 3 would have the coil wired from output of relay 1 and the output contacts go to supply power to relay 2 contact. I'm probably not explaining it...