Why it’s essential to install SCALA2 correctly

Installing SCALA2 correctly is crucial for several reasons.

It will help maintain optimal performance, prevent damage to the pump and water system, ensure energy efficiency, prevent system leakages and any resulting water damage, comply with regulations and provide consistent water pressure around the home.

Follow local legislation and regulations such as plumbing codes, as well as our best practice tips below to optimise your SCALA2 system.

 

How to install SCALA2 correctly

Please note that this best practice checklist is intended as a general guide only.

To ensure the correct installation of SCALA2 in your location, always refer to the documentation that came with your pump and consult with a professional when necessary.

Find the SCALA2 documentation here.

 

Preparation

1. Review product documentation and specifications
Review the Installation & operating instructions and Data booklet, available to download here: SCALA2 Documentation.

Familiarise yourself with your SCALA2’s technical details such as flow rate, maximum pressure, power supply, and dimensions. This will ensure the pump meets your customer’s application demands. Be sure to check local legislation and regulations; for example, drinking water installations must follow special requirements. Install the pump.

2. Choose a suitable installation location
The pump can be installed both indoors and outdoors (SCALA2 is IPX4 rated).

Consider factors like accessibility, stability and proximity to the water source. Ensure there is enough space for maintenance.

The pump should be installed near a drain, or in a drip tray connected to a drain. SCALA2 has an integrated drip tray, as it’s normal for the shaft seal to leak slightly on start-up. Installing in a separate drip tray helps deal with any pipe connection leakages, and lead away any possible accumulated condensation on the pump frame. Install in a ventilated room to help avoid condensation.

For outdoor installations, it is recommended not to expose the booster to direct sunlight. In winter periods, the system exposed to frost risk must be totally empty.

3. Check the power supply
Verify that the power supply meets the requirements specified in the product manual.

Confirm if an electrician’s assistance is needed for electrical connections. Any modifications to electrical connections should be performed by a licensed electrician.

4. Prepare the necessary tools
Gather the tools required for installation, such as wrenches, pliers, pipe cutters, Teflon tape*, and a voltage tester.

Please note all pump connections require hand tightening only: do not use a wrench. Using wrenches can overtighten and crack connection housing and may void warranty.

*If the pipe is sealed with flat gaskets, do not use sealing tape.

5. Prepare the required materials
Collect all the necessary materials for installation, including pipes, fittings, valves and any additional accessories required.

 

Installation

1. Turn off the power supply
Prior to installation, make sure you turn off the electrical supply to the area where the pump will be installed to avoid any accidents or electrical hazards.

2. Install the pump
Securely install the SCALA2 pump in your selected location, ensuring it is level and stable. Ideally, place it on a vibration-dampening rubber pad to create a quieter environment.

3. Connect the pipes
All pump connections require hand tightening only: do not use a wrench. Using wrenches can overtighten and crack the connection to the pump housing, potentially voiding the pump’s warranty.

Install the necessary pipes, fittings, and valves to allow for proper water flow.

Inlet and outlet connections are adjustable by ±5°.

The diameter of the inlet pipe must be larger than 1″ if it is longer than 10 m (32.8 ft), or if the suction lift exceeds 4 m (13.1 ft).

Connect the outlet to a straight horizontal pipe. Placing a straight horizontal pipe before any bends in the piping system can help reduce unnecessary friction loss and stabilise flow. All piping in the system should be properly supported.

We recommend using flexible hoses to provide safe and taint-free conveyance of potable water. Grundfos flexible hoses are Water Regulation Advisory Scheme (WRAS) approved for both hot and cold water, and have excellent kink resistance and durability with a strong abrasion- and crush-resistant construction.

Use Teflon tape or appropriate sealants to prevent leaks at the connection points. Do not use sealing tape on pipes sealed with flat gaskets, such as Grundfos flexible pipes.

Refer to the general precautions for inlet and outlet pipes in the SCALA data booklet.

4. Check the connections
Ensure that all connections between the pump, pipes and valves are tight and secure. Use a water pressure gauge to check for any leaks or pressure irregularities.

5. Prime the pump
The pump must be primed with 1.7 litres (0.45 gallons) of water before first start-up.

For suction lift applications, the locking pin (if mounted) must be removed and the pump may need to be re-primed (priming to a foot valve is recommended).

6. Start and check the pump
Turn on the power supply and test the pump’s functionality.

Start the pump with a tap open at the highest point of the system. This removes the air from the pump and system, and fills the pump with water.

Check for any unusual noises, vibrations or leaks. Monitor the system to ensure it is operating within the desired parameters.
It is normal for the shaft seal to leak slightly on start-up until the shaft seal faces are fully lubricated. Therefore, the pump should be installed near a drain, or in a drip tray connected to a drain (see step 2 above).

7. Adjust the tank pre-charge pressure.
Set the pressure to 70% of the setpoint value: never above it.

For more on setting pre-charge pressure, scan the label on top of the pump or go directly to our how-to guide.

Operation

1. Perform system checks
Test the pump’s performance under different load conditions to ensure it meets your customer’s requirements and is providing the expected water pressure and flow rate.

Ensure the system in which the pump is installed, is designed for the maximum pump pressure (to prevent any backflow pressure over 10 bar).

2. Conduct final inspections
Inspect the entire installation for any potential issues, such as loose connections, improper wiring or water leaks. Address any identified problems as appropriate.

3. Educate the user
Provide the end-user with necessary guidance on operating and maintaining the pump to ensure its optimal performance and longevity. Direct them to grundfos.com/scala2 from where they can find product support and information.

Let them know who to contact if any errors or alarms are displayed on the operating panel.

We recommend an annual check of the pre-charge pressure in the integrated pressure tank. This is because all pressure systems with air expansion vessels require proper pre-charge pressure for optimal operation and energy savings, so adjustment may be necessary.

 

Want to know more?

Check out the following resources for further information:

Other how to guides

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