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I am using boiler mate as heat ex changer hot water.

Customer Question
I am using boiler mate...
I am using boiler mate as heat ex changer for solar hot water. I have an Amtrol set point controller and would like to know how to wire the set point controller to operate 110 volt heat dump valves.
Submitted: 3 years ago.Category: HVAC
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Answered in 4 minutes by:
7/3/2015
HVAC Technician: Rick, HVAC Supervisor replied 3 years ago
Rick
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 24,602
Experience: 40+ yrs. experience as a licensed oil & gas technician.
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I don't follow your config. Is the boilermate your back up DHW? where are you dumping heat to? the boiler mate? I'm not sure what you mean by "an Amtrol set point controller". Are you referring to the built in boilermate controls or do you have a separate controller? if the latter I need a model number
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Customer reply replied 3 years ago
numbers on it are:
98160327(###) ###-####131R
Model is not written next to any of these numbers.
It is a built in control and it just has a set point. It is for DHW and I am dumping it to an outside radiator.
HVAC Technician: Rick, HVAC Supervisor replied 3 years ago
Ok first you can't use the boiler mate control to operate an excessive heat dump. DHW is domestic hot water. So besides the solar you need a back up DHW source for days when the sun don't shine. It sounds to me like the boiler mate is that back up. Do you have a separate solar hot water storage tank? what are you using for a controller for the solar? is the solar a closed loop or a drain back system?
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Customer reply replied 3 years ago
I am using the boilermate as a preheater to the electric hot water heater
HVAC Technician: Rick, HVAC Supervisor replied 3 years ago
What are you using for a solar controller? is the solar closed loop or drain back? you mention an electric water heater, does it have a solar coil in it?
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Customer reply replied 3 years ago
Closed loop, no controller would like to use theromstat in boilermate to protect against overheating through the heat dump. Boilermate has it's own internal coil which preheats the domestic water for the electric hot water heater.
HVAC Technician: Rick, HVAC Supervisor replied 3 years ago
You can't do this without a solar controller. It's not safe to operate a solr hot water system without a controller. I'm very familair with the boilermate and the internal aquastat relay in the boilermate can't be used for this purpose.
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Customer reply replied 3 years ago
What does a solar controller do? It controls flow and temperature correct?
HVAC Technician: Rick, HVAC Supervisor replied 3 years ago
It senses (with remote sensors) tank and collector temps and turns the pump on and off accordingly. Most of them also have a temp overload feature which is what you'd use to control your heat dump solenoid.
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Customer reply replied 3 years ago
I have 2 valves one is normal ope one is normal closed when the set point is reached water being circulated by the circulator pump will be diverted to the heat dump instead of the boilermate. I have an expansion tank in my closed loop system.
HVAC Technician: Rick, HVAC Supervisor replied 3 years ago
You still need a controller.
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HVAC Technician: Rick, HVAC Supervisor replied 3 years ago
With your config you could be burning fuel (whatever your boiler uses) to heat the outdoors
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