Solar Control System
The Solar Control System is both the heart and brains of a solar water heater. It is what controls the flow of heating fluids and water, based on programmable temperature differential measurements. It measures the temperature in various zones such as at the output of the collectors and compares this to the temperature of the solar storage tank and makes decision to turn off/on pumps and Diverter valves.
There are 3 main parts to a Solar Control System:
Digital Controller- This consists of a differential computer that has temperature input sensors and also has output relay controls. The digital controller will turn the pumps on when there is heat demand from the collector, divert the heat to an auxiliary heating system and shut the system down if the heat demand is too low (or too high in emergency conditions).
Mechanical Pumps and Diverts- This consists of the components that physically move and control the water or heating fluid This consists of pumps and electronic Diverter valves are used to control the flow with in a solar thermal system.
Specialty Plumbing- Often over looked but vital to safe and efficient operation of a solar thermal system. These are the various specialty pluming requirements that are needed to properly operate any solar heating, including:
- safety features -such as pressure release valves, one-way flow valves and expansion tanks
- service features -such as fill and drain valves as well as shut of valves
- operating regulators -such as pressure display, flow meters, hot and cold temperature valves
- Maintenance features -such as air bleeding scoops
Fortunately there are systems that combine all three components into one compact pre-assembled system. This make installation very quick and reduces the chances of failures and incorrect installations. Northern Lights uses PAW solar flow stations with RESOL DeltaSol computer controllers for all our systems. These German engineered system have been used in over 2, million solar installations world wide, making them the industry's leading suppliers of quality solar components and controllers. Their proven track record means you be assured the best system on the market!
RESOL Controllers
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DeltaSol AL
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DeltaSol BS Plus
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Download Spec Sheet 
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Download Spec Sheet
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The RESOL DeltaSol® AL Is a basic solar differential controller and offers a clear operating concept and is equipped with the newly developed illuminated display with system-monitoring. Flashing symbols for sensors, pumps and valves enable an immediate display of temperatures, temperature differences and active outputs. Adjustment and control of the solar system can be easily carried out.
- Illuminated system-monitoring-display
- Up to 3 temperature sensors Pt1000
- Solar operating hours counter
- 1 basic solar system control with one tank and one collector field
- Basic Pool Controller
- Heat balancing, tube collector function
- Energy metering
- Function control
- Enclosure in outstanding design and easy user friendly operation
- Emergency shut down and cooling function
- Freeze protection
- System Cooling & Collector Cooling
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The RESOL DeltaSol® BS Plus system controller is for standard solar thermal systems with 2 standard-relays allowing control of two zones such as water and AUX heating zone. It has an additional aqua stat function preprogrammed for different hydraulic layouts and is equipped with energy metering.
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Pump Stations
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FLOWSOL B with BS Plus
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Download Spec Sheet
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- All medium-bearing parts are made of brass
- Intergrated BS Plus Controller
- All connections 3/4“ female
- With Pre-assembled steel wall bracket
- Full port ball valve in return pipe is noise-free, low pressure drop, manual opener for faster line drain service, spring-actuated - special design for solar thermal applications
- Large ball valve handles for easy grip, and visible closing position
- Air-Scoop in the supply line for a permanent degassing of the heat transfer medium
- Function-optimized design insulation made of durable elastic EPP; 100% insulation of the fittings - excellent pump ventilation and cooling
- Solar safety assembly Pressure relief valve 86 PSI high-temperature manometer 0 - 90 PSI with Drain valve for flushing and filling, flat sealing connection for expansion tank
- Full metal solar thermometer, 32-320°F (0 - 160°C) can be pulled-off, with immersion sleeve being integrated in the ball valve
- Fully assembled with flat sealing union connections at most joints
- Pump can be isolated for servicing
- Flow meter Flow quantity measuring device with balancing valve, 1-13 l/m
- Flushing and draining unit integrated Two drain valves (at the Flow meter and at the safety group) enable the filling and flushing of the system
- Wilo Star 3 speed pump S21
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- All medium-bearing parts are made of brass
- All connections 1/2“ female
- With Pre-assembled steel wall bracket,
- Full port ball valve in return pipe is noise-free, low pressure drop, manual opener for faster line drain service, spring-actuated - special design for solar thermal applications
- Large ball valve handles for easy grip, and visible closing position
- Air-Scoop in the supply line for a permanent degassing of the heat transfer medium
- Function-optimized design insulation made of durable elastic EPP; 100% insulation of the fittings - excellent pump ventilation and cooling
- Solar safety assembly Pressure relief valve 86 PSI high-temperature manometer 0 - 90 PSI with Drain valve for flushing and filling, flat sealing connection for expansion tank
- Integrated solar thermometer and Pressure guage, 32-320°F (0 - 160°C) can be pulled-off, with immersion sleeve being integrated in the ball valve
- Pump can be isolated for servicing
- Flow meter Flow quantity measuring device with balancing valve, 1-13 l/m
- Flushing and draining unit integrated Two drain valves (at the Flow meter and at the safety group) enable the filling and flushing of the system
- Wilo Star 3 speed pump S16
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RESOL FLOWSOL PUMP STATION
Pump Station Features
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Airstop
Especially designed to permanently de-aerate the solar fluid of solar installations.
Optimum installation point: in the collector flow, in the solar valves and fittings.
- accessible, easy access for servicing during operation
- high de-aerating output due to low viscosity at high temperatures of the solar fluid in the flow and due to big volume (minimal flow velocity, long storage period)
The air separated from the solar fluid gathers in the Air stop and can be vented from time to time. Using especially stainless steel corrugated pipes, the system can be completely vented.
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High Temp Flow Valve
Brass fitting for high temperature. The flow valve ensures flow of the system only one way and prevents anti siphon caused by thermo-siphoning during the evening. Manual temperature gage with service valve allows for quick servicing without having to drain the system.
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Flow Meter
High quality Bora Silicate Glass Flow meter with service valve ensures accurate calculation of flow. Adjustable flow valve allows micro calibration of flow.
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Commercial Heating Control System
