Mystery thermostat question

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Mystery thermostat question

December 28, 2016, 07:54:51 pm

In the head of my 96 U320 there is a thermostat labeled "hydroflame'. And it turns something on. The question is what?
Anybody?

Re: Mystery thermostat question

Reply #1 – December 28, 2016, 08:24:03 pm

That is what turns on the bathroom aquahot heater blower

Re: Mystery thermostat question

Reply #2 – December 28, 2016, 09:11:18 pm

Quote from: red tractor – December 28, 2016, 08:24:03 pm

That is what turns on the bathroom aquahot heater blower

does it have anything to do with the heat on the floor? Living room gets warm but bathroom doesnt so was wondering

Thanks

Re: Mystery thermostat question

Reply #3 – December 28, 2016, 09:16:08 pm

Yes. Turn it on and set the desired temperature and you should get heat if it's working properly.

Re: Mystery thermostat question

Reply #4 – December 28, 2016, 09:52:29 pm

Thanks all

Re: Mystery thermostat question

Reply #5 – December 28, 2016, 11:04:47 pm

That also will heat your bays where the water tank and pump are. You need to have either the diesel or elect switch in the on position of your Aqua hot system to produce heat.

Re: Mystery thermostat question

Reply #6 – December 29, 2016, 11:06:18 am

You should have 3 of those in your coach 1st in living room zone 1 - 2nd in the bath zone2 - 3rd in bedroom zone 3 , If when you turn either one of the 3 zones the pump in Aqua Hot comes on and it also turns on fans behind the heat exchange's in whatever zone is turned on, all this is done in side cover of Aqua Hot, If when you turn on bedroom and the other one comes on , wiring is been changed, all zones are activated by a negative signal from t-stats on wall

Re: Mystery thermostat question

Reply #7 – December 29, 2016, 11:33:24 am

You need to get your signature showing your year and model as some later coaches only have two thermostats, one in living room for zone 1 and 2 and one in bath for zone 3

Re: Mystery thermostat question

Reply #8 – December 29, 2016, 01:04:40 pm

Quote from: rbark – December 28, 2016, 11:04:47 pm

That also will heat your bays where the water tank and pump are. You need to have either the diesel or elect switch in the on position of your Aqua hot system to produce heat.

Richard, can you heat your bays without heating the cabin? Just concerned about those rare nights where we do get down to the 30's.

Re: Mystery thermostat question

Reply #9 – December 29, 2016, 01:45:09 pm

Quote from: Sven and Kristi – December 29, 2016, 01:04:40 pm

Richard, can you heat your bays without heating the cabin? Just concerned about those rare nights where we do get down to the 30's.

Sven,

This isn't Richard but let me jump in.

This only applies to coaches with the Aqua Hot system.

Unless someone has changed things you should have a t'stat in the water pump bay area that will cause the heater units in the basement to operate separate of the "cabin area" You do have to have either the electric or diesel switch inside "on" as the t'stat don't turn on nothing but the circulating pump to that loop and the heat fans.

As far as 30* we don't even worry about basement heat.

Pamela & Mike

Re: Mystery thermostat question

Reply #10 – December 29, 2016, 06:16:19 pm

Just what I was going to say.

Re: Mystery thermostat question

Reply #11 – December 29, 2016, 06:35:49 pm

I have a mystery with my Bedroom heat exchanger that I need to track down. When it turned cold here the bedroom fan started coming on when the main thermostat was not set to call for heat in the bedroom. I thought it might be a sticky relay but I proved that it was not. When I turned down the thermostat in the bay to its lowest position it stopped the heat exchanger fan in the bedroom. I don't understand why the bedroom heat exchanger would be connected to the thermostat in the bay and also to the 4 button thermostat in the coach. Any ideas?

Re: Mystery thermostat question

Reply #12 – December 29, 2016, 07:29:10 pm

Quote from: rbark – December 28, 2016, 11:04:47 pm

That also will heat your bays where the water tank and pump are. You need to have either the diesel or elect switch in the on position of your Aqua hot system to produce heat.

Thanks. Thats a good thing to know. So that thermostat controls the heat for the bathroom area and the heated storage bay. And since the aqua hot is the furnace it must be on i assume.

Re: Mystery thermostat question

Reply #13 – December 29, 2016, 08:20:52 pm

Michaeloh59, that's right. There is also a Tstat mounted where your Manoblock water system is that you can set the temp also. I think most set it around 35 deg.

Re: Mystery thermostat question

Reply #14 – December 29, 2016, 08:50:31 pm

Michael, that thermostat does not turn on the bay heat only the bathroom heat. the thermostat by the manabloc is what turns on the bay heat, and yes the aqua hot has to have either the diesel or electric turned on the heat the fluid in the boiler tank which is then circulated through the system when a zone calls for heat.

Re: Mystery thermostat question

Reply #15 – December 29, 2016, 09:27:49 pm

The confusion here is that the bathroom and the basement are on the same AquaHot fluid zone loop (iow - they share the same zone valve), but each have their own thermostat that controls the blowers in their respective areas.

Re: Mystery thermostat question

Reply #16 – December 29, 2016, 09:29:53 pm

Thanks Michelle, you did a much better explanation then I did. It was much easier to understand.

Re: Mystery thermostat question

Reply #17 – December 29, 2016, 09:36:12 pm

My bad, I thought the bathroom fan also heated the bay at the same time. 😩

Re: Mystery thermostat question

Reply #18 – December 29, 2016, 09:44:26 pm

Richard,

Just for your info you have 2 heat radiators and fans in your water pump/service bay.

Pamela & Mike

Re: Mystery thermostat question

Reply #19 – December 29, 2016, 10:08:16 pm

Quote from: Pamela & Mike – December 29, 2016, 09:44:26 pm

Richard,

Just for your info you have 2 heat radiators and fans in your water pump/service bay.

Yes - and critters like to build nests on them, so use an inspection mirror and check them periodically....

Re: Mystery thermostat question

Reply #20 – December 30, 2016, 01:44:02 am

last week we drycamped in front of my folks house in Las Vegas.

Knowing the weather would be at freezing I turned the bay heater thermostat from it lowest position to 50 degrees.

You could hear the fans running below the floor I have never heard before. Obviously works.

55 degree temp increase from the input temp allows hotter showers if you do not care about the additional consumption of diesel and battery power to run the bays blower fans.

Good test.

Re: Mystery thermostat question

Reply #21 – December 30, 2016, 10:43:46 am

Quote from: Caflashbob – December 30, 2016, 01:44:02 am

last week we drycamped in front of my folks house in Las Vegas.

Knowing the weather would be at freezing I turned the bay heater thermostat from it lowest position to 50 degrees.

You could hear the fans running below the floor I have never heard before. Obviously works.

55 degree temp increase from the input temp allows hotter showers if you do not care about the additional consumption of diesel and battery power to run the bays blower fans.

Good test.

Maybe just faster hot water, the temperature is set by the Aqua Hot tempering valve. A pain to adjust though

Re: Mystery thermostat question

Reply #22 – December 30, 2016, 11:46:29 am

Quote from: Caflashbob – December 30, 2016, 01:44:02 am

55 degree temp increase from the input temp allows hotter showers if you do not care about the additional consumption of diesel and battery power to run the bays blower fans.

This statement is wrong.

Just like how any thermostat operates, the basement thermostat has nothing to do with the temperature of the hot water (or heat) coming from the AquaHot. It merely sets the temperature below which the heat comes on in that area, above which it does not.

As craneman states, the temperature of the hot water is controlled by the AquaHot.

Re: Mystery thermostat question

Reply #23 – December 30, 2016, 12:21:06 pm

I was testing heating the water tank itself. Starting out with 50 degree water versus 40 degree water.

Then the 55 degree max rise....

Re: Mystery thermostat question

Reply #24 – December 30, 2016, 12:35:24 pm

Quote from: Caflashbob – December 30, 2016, 12:21:06 pm

I was testing heating the water tank itself. Starting out with 50 degree water versus 40 degree water.

Then the 55 degree max rise....

The function of the aquahot is to heat the water to a set point, The higher the input temp, the less it has to work. This has nothing to do with the demand. If it cannot supply the water at the set temp, the boiler will keep firing and attempt to reach the set temp. This is how it works, makes no difference what registers are open. The max rise is at a certain demand [gpm].
If there is no demand, it could be 75 f. rise. I believe max temp rise on some aquahot models is at 1.5 gpm

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