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Wrenches,<br>
For Wrenches who do the occasional DC hydronic or battery-based SDHW
control: <br>
Here's a reference to a product that can handle one- or two-stage
remote temperature setpoint control, and it's readily available at a
reasonable price.<br>
<br>
Ranco makes a line of standard commercial remote-bulb setpoint
controllers for refrigeration and similar apps. They're available in
single-stage (like the defunct GoldLine SP30) and two-stage (like
the SP300), with a variety of input voltages. The 24VAC models work
fine on 24VDC as well. <br>
<br>
These are available through Grainger.com. It's under $100, has a
1/2" KO and a digital temperature display. The 3ZP79 single-stage
setpoint controller has this description:<br>
<blockquote>Electronic Temperature Control, Input Voltage 24 Volts,
Switch Action SPDT, Sensor Thermistor, 2 Inches Long, 1/4 Inch
Diameter, 8 Feet Cable, Set Point Range -30 to 220 Degrees
Fahrenheit, 0-10 Volts Output No, Ambient Humidity Range 0 to 95%
RH, Noncondensing, Differential Range 1 to 30 Degrees Fahrenheit,
Enclosure NEMA 1, Number of Stages 1, Length 2 Inches, Height 6.52
Inches, Depth 2.48 Inches, Width 2.7 Inches</blockquote>
The two-stage version is the 3ZP84, at under $160.<br>
<br>
The Grainger listing doesn't specify AC or DC, but the box and
instructions call out only 24VAC. When I called the manufacturer's
tech support line, the man informed me that it wasn't designed to
work on DC, and it was in violation of its intended use. OK, so I
tried it. It works fine. I'm using it to send a temperature-based
call for backup boiler heat for the sidearm DHW tank on my DC
hydronic home heating control system.<br>
<br>
Someone out there can use this info...<br>
Allan<br>
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<font face="Times New Roman, Times, serif"><b>Allan Sindelar</b></font><br>
<small><a href="mailto:Allan@positiveenergysolar.com"><font
color="#000099" face="Times New Roman, Times, serif"><u>Allan@positiveenergysolar.com</u></font></a></small><font
face="Times New Roman, Times, serif"><br>
<span style="font-size: 10pt;">NABCEP Certified Photovoltaic
Installer<br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
<b>Positive Energy, Inc.</b><br>
3201 Calle Marie<br>
Santa Fe, New Mexico 87507<br>
<b>505 424-1112</b><br>
<a href="http://www.positiveenergysolar.com/" target="_blank"><u>www.positiveenergysolar.com</u></a><o:p></o:p></span></font>
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