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Installing Solar Thermal Controllers

My sensor cable is only 4 feet long. How do I wire it from the controller all the way to the collectors?

My sensor cable is only 4 feet long. How do I wire it from the controller all the way to the collectors? First off, when wiring to the collectors, make sure you use the high temp sensor (usually black or red). One end of the sensor cable has the sensor, which needs to be at the hot end of the collector array, and the other end has crimped wires that fit easily and securely into controller slots. So, the best thing to do is cut the sensor cable in half, and use each half where it is meant to be […]

How do I get my SmartMaxx DHWPlus controller from Celcius to Farenheit?

How do I get my SmartMaxx DHWPlus controller from Celcius to Farenheit? Push the “+” button until you move to end of the main menu (time). Press the “+” button continuously for about 3 seconds to get into the adjustment submenu. You should see “Arr.” Temperature scale choice is near the end of the submenu, so keep pushing the “+” button until you see “UNIT.” When you get there, press the “OK” button once. “SET” will start blinking on the screen. Press the “+” button once, and Celcius will change to Farenheit. Push the “OK” button again to make the […]

What is involved in setting the drainback option (ODB) on my SmartMaxx-DHWPlus controller?

What is involved in setting the drainback option (ODB) on my SmartMaxx-DHWPlus controller? In the submenu, switch ODB from “OFF” to “ON.” Four new items will appear in the submenu: tDTO, tFill, tSTB, and OBST. Some experimentation may be necessary to get these settings correct for your system. tDTO (time period switch-on) is the amount of time the DT O must be met before the controller will turn the pump on. The factory setting is 60 seconds. The collector/tank temperature differential must be met for 60 seconds straight before the controller will trigger the pump. tFill (filling time) is the […]

How do I get into the adjustment submenu on my SmartMaxx-DHWPlus controller?

How do I get into the adjustment submenu on my SmartMaxx-DHWPlus controller? Press the “+” button to move through the main menu (Display Channels) until you reach the last item in the main menu. Then press the “+” for about 3 seconds straight until you access the submenu (Adjustment Channels). The first code displayed will be “Arr.”

How Do I Get My SmartMaxxDHWPlus Controller from German to English?

How do I get my SmartMaxxDHWPlus controller from German to English? With the controller plugged in, push the “+” button until you reach the end of the main menu. You will see the time displayed under the German “ZEIT.” Then push the “+” button for about 3 seconds straight until the controller goes to the submenu. “ANL” is the first German code in the submenu. Once you have accessed the submenu, press the “+” button until you reach the end of the submenu (a version number). Then press the “-“ button three times to go back to language (German “SPR”). […]

Setting your solar thermal system differential temperature setpoint.

Q:What is the most appropriate differential temperature for my solar thermal system? A: The factory setting on our controllers is 12 Degrees. This will work fine but for northern climates it is better to have a delta T of 17 Degrees. This will allow the collector to heat up sufficiently so as to not turn the pump on and off early in the cold mornings. In warmer climates, say mid-latitude and below you can keep the factory setting at 12 deg F.

What is the most appropriate delta T for Northern climates?

Question: What is the most appropriate delta T for Northern climates? Answer: 17

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