Grundfos 15-65 B

Stock Replacement Parts

We carry a huge range of solar hot water circulating pumps. Solar Hot Water Repairs will repair or replace any brand of solar hot water system or hot water system. We are mainly based on the Sunshine Coast and can easily fix system in a wide range of areas.

  • Grundfos 15-65 B

    Grundfos 15-65 B

     

     

    We use the Grundfos Solar 15-65 B for closed loop and open loop solar hot water systems. Plumbing repairs on the saxon system can be tricky but we have had plenty of experience in fixing these systems over the last 8 to 9 years. 

    The Grundfos 15-5B circulating pump was bought into the country and used with the Saxon closed loop Solar Power SP4002 solar hot water system. It has a higher head capacity then the Grundfos Solar 15-20 CIL. The Grundfos 15-20 CIL is not a suitable replacement pump for the Viking pump used in the Solar Power SP4002 hot water system.

    Saxon solar hot water systems are no longer made. However, we have managed to secure a quantity of the Grundfos Solar 15-65 B circulating pumps as replacement parts. This pump can be used with similar solar hot water systems made by Solar Power and Solar Land that made use of the Saxon tank.

     


    Solar Hot Water Repairs QLD repair solar hot water systems on the Sunshine Coast but also from Brisbane to Hervey Bay. For all solar hot water enquiries please call 0455 265 539 or email accounts@solarhotwaterrepairsqld.com.au.


     

     

     

    The Grundfos Solar 15 65 B solar hot water circulating pump is an OEM pump that has been supplied to replace the viking solar hot water pump in the Saxon SP4002 Solar Power solar hot water system.

    The viking pump is no longer made. See below information on the controller used with the original pump.

    Operation

    The controller measures the temperature of a roof mounted collector and the temperature of a water storage tank. When the tank temperature is low and the collector is hot, the controller will turn on the pump to recirculate water from the tank through the collector. Water passing through the collector will be heated from the sun.

    If the water in the tank is already hot, then the pump will not run regardless of how sunny and lovely the day is.

    This system is not a pure solar system. It is a boost system that aims to reduce but not eliminate gas or electricity use. It is most cost effective with paired with an off-peak electric system, where solar will be the only source of heat during the day and electricity will be used at night.

    Temperature Sensor Inputs

    The controller requires either 2 or 3 temperature sensors, depending upon the type of tank.

    • 2 Sensor

      Most installations will use 2 temperature sensors. One sensor will be placed in the water tank and be connected to the Tank Bottom input. The other sensor will be placed up at the collector and be connected to the Solar Collector input.

      The 85°C/75°C link should be REMOVED for the 2 sensor system.

      In the 2 sensor system, the pump will only operate if the collector is hot and the tank temperature is below 82°C. It will turn the pump off when the tank temperature reaches 85°C.

    • 3 Sensor

      Other installations that have a lower temperature water tank use 3 temperature sensors. Two sensors are placed in the water tank, one near the bottom the other near the top. This is to ensure no part of the tank ever gets too hot. They are connected to the Tank Bottom and Tank Top inputs. The third sensor will be placed up at the collector and be connected to the Solar Collector input.

      The 85°C/75°C link should be INSTALLED for the 3 sensor system. Do not remove the link as the tank may be damaged and is costly to replace.

      In the 3 sensor system, the pump will only operate if the collector is hot and the tank temperature is below 71°C. It will turn the pump off when the tank temperature reaches 74°C. Only the bottom sensor is used to determine if the pump should turn on, but it will turn off when either sensors detects it's too hot.

      The three sensor system also supports frost prevention. If the collector temperature falls below the defrost threshold, the pump will turn on to pump hot water from the tank through the collector coils to protect them from the effects of the water freezing in the tubing. Pumping will continue for at least 15 minutes, unless a sensor fault is detected.

    Indicator LED

    The indicator LED may help diagnose faults. It indicates the following things:

    • LED Steady On

      Normal. System is idle. Pump is off.

    • 1 short flash

      Normal. Pump is running.

    • 2 short flashes

      Fault. A temperature sensor is faulty.

     

    Billing information

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