SmartMaxx-Pro Large Temp Difference Controller with 2 Relays

SmartMaxx-Pro Large Temp Difference Controller with 2 Relays


SKU: SmartMaxx-Pro-L4 Category:
View cart

How do I order? 

  • Orders can be placed online using the online ordering system. Our office will contact you to confirm your order, shipping details, and payment.
  • SunMaxx Solar is a manufacturer of solar hot water equipment, availability and production lead-times vary based on our production order queue

Manufacture Direct Pricing

Please note the referenced prices online are for manufacturer direct pricing only. For wholesale & distribution inquires, please contact our office for an offer.

Want to speak with our office? Call us 1-877-786-6299


SmartMaxx-Pro Controller Series

SunMaxx Solar offers pre-packaged solar hot water heating systems for both the do-it-yourself customer and the professional installer. Each system includes the primary components required when installing a solar hot water heating system. It is our goal to keep our product cost low in order to ensure that we are making renewable energy products more affordable to the community.

Product Description

The SmartMaxx-Pro Series sets a new standard in solar thermal differential control. Combing practical design with a feature rich, crystal clear operator guidance system, SunMaxx can offer sophisticated control in an extremely user-friendly package.
Users are presented with programming and operational information, in graphical or plain text formats in one of many user selectable languages.

These controllers are designed to offer installers and system designers an extremely flexible, feature rich platform capable of system control, data logging and remote administration in one compact, easy to use product. In order to collect data your system also needs SmartMaxx 1″/150 GPM flow sensor and PT1000 sensor elements which ensure full control of a solar hot water system. These Controllers also incorporate a built in MicroSD card slot for data logging purposes, as well as an optional Ethernet module for remote programming, diagnostics and data logging analysis.

Terminal Connection Details
Terminal Connection
R1 Relay 1
R2 Relay 2
R3 Relay 3 (normally open)
R3| Relay 3 (normally closed)
L Mains Phase Conductor L
R Mains Neutral Conductor R
Relay Rated Load (A) 2 / 4 (depending on the fuse)


Important Note: Relays which are operating in SmartMaxx Pro L4 have different capacity that the device! Solar controllers are fused at 2A or 4A depending on a version. If the solar system requires a solar pump (UniMaxx Series) which operates on a higher amperage please consider higher fused version. Otherwise the controlling device might be damaged. Please get familiar with product datasheet and call your sales representative.

Features & Benefits

  • Self-explanatory full text menus for quick understanding
  • Temperature sensors with PT1000 sensor elements ensure precise recognition of the temperature difference and optimum use of energy.

  • Conforms to CAN/CSA E60730-2-9-1 (R2007)
  • Ideal for small commercial and large residential solar hot water and heating systems
  • Full Graphical / 128 x 64 dot display control
  • Standard SmartMaxx Pro L4 max. amperage is 2A.
  • The product version can be updated to 4A if needed

Technical Details


  • Mains Voltage: 100 – 240 VAC
  • Mains Frequency: 50 – 60 Hz
  • Power Consumption: 0.5 – 2.5 W
  • Controller Max. Amperage: 2 or 4 A
  • Overall Dimensions: 6.42 x 4.33 x 2.04 in
  • Aperture Installation Dimensions: 6.18 x 4.17 x 1.22 in
  • Display: Full Graphical / 128 x 64 dot
  • Network Connections: CAN Bus
  • Real Time Clock: RTC / 24hr Power Reserve
  • Temperature for operation: 32 – 104 °F
  • Temperature for transport / storage: 32 – 140 °F
  • Air Humidity for operation (@77°F): 85%

SunMaxx’s Pump Stations are an all in one solar hot water component featuring a circulator pump, a digital controller and valves engineered to keep your system circulating the solar heat transfer fluid through the collectors and into the storage tank.

SunMaxx will size a pump station specific to your needs. No need to do the math!!!

Our pump station’s fill valve has GHT hose threads on the outside. You can easily make an adaptor using the following three fittings, which can be purchased at your local hardware store or plumbing supply.

  • Schrader valve x ¼” male NPT
  • Reducing Bushing, ½” NPT Male x ¼” NPT Female
  • Hose fitting, ½” NPT male x ¾” swivel GHT female

Use Teflon tape on the NPT threads of the Schrader valve and bushing in constructing the adaptor. When attaching the adaptor to the pump station, be sure to use two tools: one to hold the fill valve in place, and one to tighten the adaptor. That way, you won’t create leaks in the pump station itself while testing.

Take a deep breath and let all your air out… of your Solar thermal system One of the biggest issues with a successful commissioning is air removal. Any time you spend with this detail will be time well spent. Air pockets become entrained within your HTF and like to find places to hide. Air pockets can form between your HTF and the inner wall of piping (especially with flexible piping) and can only be removed through persistence and time. Here are a few things you can do to help this process. First, be sure that your air purger is located on the high and hot side of your collector series. The hotter the fluid the less the ability for dissolved gasses to stay in solution and the higher the air vent, the more likely you will effectively remove trapped air that, due to its buoyancy, will rise to the top. Once you feel most of the air has been removed this way, you can shut that air eliminator off or remove it all together. If you install a Titan Power Plus collector, you will have a manual air bleeder permanently installed in your line set connections. If you install a ThermoPower collector, you will include an air vent that should be isolated and de-commissioned at this point. Now, down to the pump station. The UniMaxx pump stations have an integral air eliminator with a scoop that will allow entrained air to collect and be bled off manually by opening the valve up to a full turn until HTF comes out. This can be done each day for the first few days or periodically checked. Smaller systems will take much less time removing the air. Another way of enabling the removal of air is to run the pump at maximum speed during commissioning, this will help to break the friction that holds the bubbles to the inner wall thus forcing the bubble through and out. After words, you should adjust your pump speed accordingly. If air persists in your system, it will inevitably find its way to the suction side of your pump and cause cavitation and eventual pump failure. If your pump appears to be not pumping, it is likely that although it is receiving 115v, it cannot pump because of air pockets. Simply unplug your pump and manual override and give it a few minutes. Air will work its way out, pump can run and then you need to go back to the air purging steps. Please view our SunMaxx technical manual (linked) for further instruction in effective system commissioning.

How to Order:

If you are confident with your solar hot water heating requirements you can place your order online by clicking on the add to cart button which is located above. All orders are reviewed by our solar hot water heating department and the customers are contacted in order to ensure that you have ordered the correct merchandise for your application. In the event you have any questions our sales staff are available from 8:30AM to 5:30PM EST.

Silicon Solar Inc ships products internationally please ask your sales representative for a shipping rate to your destination.

Need Assistance?
If you have questions need help or simply feel uncomfortable placing your order online feel free to contact the product representative at 1-800-786-0329.

You've just added this product to the cart: