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Old 01-02-2012, 11:18 PM   #1
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Hydro Hot Question

My motorhome has the Hydro Hot system, with two thremoststs, one in bedroom and one in kitchen. If the thermostats are not set at the same temp, the highest turns on the fans and they blow cold air till the other thermstat is set the same then the burner will light. Is this normal. Have to keep the whole motorhome at same temp or burner does to light when only one thermstat requires heat. Any suggestions.
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Old 01-02-2012, 11:48 PM   #2
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Welcome to the forum. For my unit I can have one thermostat set to operate and one off. If I want to operate both thermostats they need to be on the same setting i.e., furnace or A/C, etc.
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Old 01-03-2012, 07:11 AM   #3
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That doesn' sound correct. It is not how my Aqua Hot works. If I turn my diesel burner switch on then the boiler fires up and maintains boiler temp regardless of what the thermostats are set at. Turning the thermostat on and setting the thermostat to furnace mode turns on the circulating pumps. Raising the temps on the thermostat then turns on the fans to blow hot air. My thermostats do not control the diesel boiler only the fans and circulating pumps. With the circulating pumps running then when the fans come on I get hot air right away.
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Old 01-03-2012, 08:11 AM   #4
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Quote:
Originally Posted by Mike Canter View Post
That doesn' sound correct. It is not how my Aqua Hot works. If I turn my diesel burner switch on then the boiler fires up and maintains boiler temp regardless of what the thermostats are set at. Turning the thermostat on and setting the thermostat to furnace mode turns on the circulating pumps. Raising the temps on the thermostat then turns on the fans to blow hot air. My thermostats do not control the diesel boiler only the fans and circulating pumps. With the circulating pumps running then when the fans come on I get hot air right away.

Ditto for my unit...
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Old 01-03-2012, 06:41 PM   #5
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Quote:
Originally Posted by Mike Canter View Post
That doesn' sound correct. It is not how my Aqua Hot works. If I turn my diesel burner switch on then the boiler fires up and maintains boiler temp regardless of what the thermostats are set at. Turning the thermostat on and setting the thermostat to furnace mode turns on the circulating pumps. Raising the temps on the thermostat then turns on the fans to blow hot air. My thermostats do not control the diesel boiler only the fans and circulating pumps. With the circulating pumps running then when the fans come on I get hot air right away.
Ditto for mine also.

I have two inside thermostats with 3 zones controlled. The kitchen/living room area is controlled by the thermostat located in the kitchen area. The thermostat in the bedroom controls two zones. Zone 1 is the bedroom, zone 2 is the bathroom. Both zone 1 and 2 on the bedroom control must be set to furnance or either zone can be off, but not set to heat or AC. The living area control can be set to anything as it is independent of the bedroom control.
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Old 01-05-2012, 07:43 PM   #6
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Thanks for the info. Fixed it today. The pump wires were crossed, so when the bedroom called for heat the bedroom fans would come but the living room pump would run. So when both thermostats were set the same it worked ok. Never tried to heat the living room and not the bedroom. Problem solved. Came this way from factory!!!!!
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