Grundfos SCALA Multistage Centrifugal Boosters

1. Product Introduction

Grundfos SCALA pumps are all-in-one integrated pressure boosters designed for domestic use and ensure a constant supply of clean water to households, gardens, and light commercial applications.

SCALA1

Grundfos SCALA1 is a self-priming, multistage pump that combines all the components of a pressure booster into a compact composite enclosure. It can communicate with the Grundfos GO Remote app through built-in Bluetooth technology, enabling high customization options.

SCALA2

Grundfos SCALA2 is a fully integrated, self-priming, compact waterworks for pressure boosting in domestic applications. It incorporates integrated speed control, allowing it to maintain perfect pressure in the taps by adjusting its performance to the increasing demand.

1.1 Features and Benefits

General benefits of SCALA pumps include:

• Easy installation
• Easy commissioning
• Easy operation

1.2 Applications

The SCALA boosters are suitable for domestic and light commercial water supply where pressure boosting is required. Recommended applications include:

• Pressure boosting of city mains water
• Pressure boosting of water from a roof tank
• Pressure boosting of water from a break tank
• Pressure boosting of water from a ground tank
• Water supply from shallow wells (up to 8 m / 26.2 ft)
• Garden irrigation
• Water transfer

1.3 Pumped Liquids

The product is suitable for pumping clean, thin, non-aggressive, and non-explosive liquids without solid particles or fibres. It is designed for fresh water with a maximum chloride content of 300 ppm and free chlorine content below 1 ppm.

2. Selection Guide

This guide helps to size and select the most suitable SCALA product. Follow the instructions to determine the best product variant for your needs.

1. Choose the right pump for your application.

2. Size your pump.

Consider the number of taps and the required flow rate to select the appropriate pump model.

Preconditions:

• A tap pressure of 3 bar (43.5 psi) is considered.
• For suction operation, remove a floor for every 3 meters (9.84 ft) of suction depth.
• A tap flow between 9 and 12 l/min average usage with half of the taps open is considered.

3. Installation and Operation

3.1 Mechanical Installation

The pump should be placed as close as possible to the liquid source to minimize inlet pipe length. A clearance of 0.5 m (1.64 ft) on three sides is recommended for motor cooling. The pump must be fastened to a solid horizontal foundation with a maximum inclination angle of ± 5°.

If pumping rainwater or well water, install an inlet filter. If the pump is installed above the liquid level, fit a foot valve with a strainer to the inlet pipe.

3.1.1 Pipe System

Ensure the inlet pipe is correctly dimensioned for optimum suction capacity. If a hose is used, it must be non-collapsible. The inlet pipe diameter should be larger than 1" if the pipe is longer than 10 m (32.8 ft) or if the suction lift exceeds 4 m (13.1 ft).

3.1.2 Inlet Pipe Length and Suction Lift

The recommended maximum inlet pipe length depends on the geodetic suction lift, as illustrated in the provided diagram.

3.1.3 Inlet and Outlet Pipes

• Install pipes to avoid air pockets, especially on the inlet side.
• Use eccentric reducers with the tapered side down.
• Keep pipes as straight as possible, using long-radius 90° bends to decrease friction loss.
• Run a horizontal inlet line with a gradual upward slope for suction-lift conditions.
• A short pipe should be the same diameter as the inlet port or larger.
• A long pipe should be one or two sizes larger than the inlet port.

3.1.4 Maximum System Pressure

Ensure the system is designed for the maximum pump pressure. When installing a non-return valve, include an expansion tank at the water heater and plumb the pressure-relief valve to a drain. Comply with local regulations. The maximum inlet pressure plus the head must not exceed the maximum system pressure. A pressure-relief valve is recommended to protect the pump.

3.2 Installation Examples

3.2.1 Suction from a Well

Diagram showing a well suction setup with components labeled: Highest tapping point, Isolating valve, Flexible hoses, Pipe support, Inlet filter, Foot valve with strainer. H1 indicates maximum suction lift (8 m / 26.2 ft), and H2 indicates the minimum submersion depth of the inlet pipe (0.5 m / 1.64 ft).

3.2.2 Suction from a Tank

Diagram illustrating suction from a tank, with components labeled: Highest tapping point, Pipe hangers, Isolating valve, Flexible hoses, Drain to sewer, Inlet filter, Freshwater tank, Foot valve with strainer, and a 1-degree inclination.

3.2.3 Mains Water Pressure Boosting, SCALA1

Diagram showing mains water pressure boosting for SCALA1, with components labeled: Highest tapping point, Pipe hangers and supports, Isolating valves, Flexible hoses, Bypass valve, Optional pressure-reducing valve, Optional pressure relief valve, Drip tray, Pressure gauge, Mains water pipe.

3.2.4 Mains Water Pressure Boosting, SCALA2

Diagram illustrating mains water pressure boosting for SCALA2, with components labeled similarly to SCALA1, including an optional pressure-reducing valve and pressure relief valve.

3.2.5 Roof Tank Filling

Diagram showing a roof tank filling system with components labeled: Float switch, External input (switch) cable, Pump, Water source (tank), Roof tank.

3.3 Electrical Connection

Electrical connections and protection must comply with local regulations. Ensure the pump is suitable for the power supply and is correctly earthed. Use a suitable adapter if the plug type differs from the power outlet. Pumps without plugs must be connected via an external main switch or wired with a plug.

3.4 Motor Protection

The pump has built-in current- and temperature-dependent motor protection. The thermal switch cuts out if the pump is blocked or overloaded and restarts automatically after cooling. No external motor protection is required.

4. SCALA1

4.1 Product Range

4.2 Motor

The motor is water-cooled and equipped with sealed, greased-for-life ball bearings for silent operation and minimum service. It includes a built-in thermal switch and requires no additional motor protection.

4.3 Features and Benefits of SCALA1

• Water on demand
• All-in-one integrated booster
• Bluetooth communication
• External input
• Twin booster enabled
• Low noise level < 55 dB(A)

4.3.1 Self-priming

The self-priming pump ensures stable operation even if not fully filled with liquid. It can lift liquid from below the inlet level and handle a mix of air and liquid until fully primed.

4.3.2 Robust Design

The pump is designed for long and trouble-free operation. Its composite construction and corrosion-resistant internal components ensure high robustness.

4.3.3 Easy Installation

Installation involves three steps: connecting pipes, priming the pump, and plugging it into a power outlet. The pump starts automatically after being plugged in.

4.4 Protection Features

4.4.1 Dry-running Protection

This feature automatically stops the pump when running without liquid, reducing the risk of damage and maintenance costs.

4.4.2 Anti-cycling Function

This function prevents frequent starting and stopping caused by minor leakages or incompletely closed taps. It stops the pump and indicates an alarm.

4.4.3 Maximum Runtime

A timer can turn off the pump after a set continuous running time, adjustable via the Grundfos GO Remote app.

4.5 Performance Curves

Performance curves for SCALA1 models at 50 Hz and 60 Hz are provided, illustrating the relationship between head, flow rate, and power consumption.

4.6 Technical Data

4.6.1 Dimensions and Weights

Dimensions (H1, H2, H3, L1, W1) and weights for SCALA1 variants are provided in tables.

4.6.2 Operating Conditions

Operating conditions for SCALA1 models, including maximum ambient and liquid temperatures, system pressure, inlet pressure, head, flow rate, IP rating, pumped liquid type, noise level, and frequency of starts/stops, are detailed in a table.

4.6.3 Electrical Data

Electrical data for SCALA1 models at 50 Hz and 60 Hz, including voltage, power (P1, P2), speed (n), current (In, Istart), and standby power, are presented in tables.

4.6.4 Construction of SCALA1

An exploded view of the SCALA1 pump is provided, with a material specification table listing components and their materials.

4.7 Approvals and Markings

Safety approvals (CE, EAC, C-US) and drinking water approvals (ACS) are indicated.

4.8 Suction Performance

Suction performance curves for SCALA1 models are provided, showing performance under various suction lift conditions.

5. SCALA1 Twin Booster System

SCALA1 can be set up as a twin booster for increased flow demand or as a stand-by pump. A dedicated accessory set includes a base plate, manifolds with valves, communication cable, and fixing screws.

5.1 Features and Benefits

The twin system offers all SCALA1 features plus the ability to handle increased flow demand.

5.1.1 Easy Installation

The SCALA1 twin booster is quickly installed by mounting pumps on the base plate, connecting them with the cable and manifolds, and then connecting to the pipe system.

5.1.2 Alternation

Pumps can be set to alternate based on runtime or number of starts, ensuring equal usage. This can be configured via the Grundfos GO Remote app.

5.1.3 Grundfos GO Remote Enabled

The twin booster system can be connected to the Grundfos GO Remote app via Bluetooth for system parameter adjustments.

5.2 Protection Features

The twin booster shares SCALA1's protective functions. Dry-run protection operates per pump, while anti-cycling and maximum runtime protection operate for the system.

5.3 Operation Modes

5.3.1 Duty/Assist

Both pumps run simultaneously to meet higher flow demands. If one pump cannot meet the demand, the second pump starts.

5.3.2 Duty/Standby

Only one pump runs at a time, with the other on standby. Pumps switch priority based on alternation settings.

5.4 Performance Curves

Performance curves for SCALA1 twin booster systems are provided.

5.5 Technical Data

5.5.1 Dimensions

Dimensions for the SCALA1 twin system are provided in a table.

5.5.2 Construction of SCALA1 Twin System

An exploded view of the SCALA1 twin accessory set is shown, with a material specification table.

6. SCALA2

6.1 Motor

The highly efficient motor is water-cooled and features sealed, greased-for-life ball bearings for silent operation and minimal service. It has a built-in thermal switch and requires no additional motor protection.

6.2 Features and Benefits of SCALA2

• Perfect water pressure
• All-in-one integrated booster
• High energy efficiency
• Easy selection
• Compact
• Low noise level < 47 dB(A)

6.2.1 Perfect Water Pressure

An integrated sensor measures discharge pressure and compares it to the desired level. The pump control adjusts pump speed via a frequency converter to maintain constant system pressure.

6.2.2 Self-priming

The self-priming pump ensures stable operation, even if not fully filled with liquid. It can lift liquid from below the inlet level and handle a mix of air and liquid until fully primed.

6.2.3 Robust Design

Designed for long and trouble-free operation with an aluminium construction and corrosion-resistant internal components.

6.2.4 Easy Installation

Installation involves three steps: connecting pipes, priming the pump, and plugging it into a power outlet. The pump starts automatically after being plugged in.

6.3 Protection Features

6.3.1 Dry-running Protection

Automatically stops the pump when running without liquid, reducing risk of damage and maintenance costs.

6.3.2 Anti-cycling Function

Prevents frequent starting and stopping due to minor leakages or incompletely closed taps. Stops the pump and indicates an alarm.

6.3.3 Maximum Runtime

A timer can turn off the pump after a set continuous running time (30 minutes for SCALA2).

6.4 Performance Curves

Performance curves for SCALA2 are provided, illustrating head, flow rate, and power consumption.

6.5 Technical Data

6.5.1 Dimensions and Weights

Dimensions and weights for the SCALA2 are provided in a table.

6.5.2 Operating Conditions

Operating conditions for SCALA2 models, including temperature, pressure, head, flow rate, IP rating, pumped liquid, and noise level, are detailed in a table.

6.5.3 Electrical Data

Electrical data for SCALA2 models, including voltage, frequency, power (P1, P2), speed (n), current (In), and insulation class, are presented in a table.

6.5.4 Construction of SCALA2

An exploded view of the SCALA2 pump is provided, with a material specification table listing components and their materials.

6.6 Approvals and Markings

Safety approvals (CE, EAC, DVE, C-US) and drinking water approvals (WRAS, ACS, NSF/ANSI 61, NSF/ANSI 372) are indicated.

6.7 Suction Performance

Suction performance curves for SCALA2 are provided, showing performance under various suction lift conditions.

7. Accessories

7.1 SCALA Twin Accessory Set

This set includes a base plate, two manifolds with isolation valves, a communication cable (for SCALA1 only), and fixing screws, enabling SCALA pumps to be connected as a twin booster system.

7.1.1 Construction of SCALA Twin Accessory Set

An exploded view of the SCALA twin accessory set is shown, with a material specification table.

7.1.2 Product Numbers

Product numbers for SCALA1 and SCALA2 twin accessory sets with different connection types (Rp and NPT) are listed.

7.2 Inlet Filter

An inlet filter is recommended for pumping rainwater or well water to protect the pump from debris and provide clean water. Features include quick installation, easy maintenance, and 80% filtration efficiency.

7.2.1 Filter Specifications

Filter specifications, including micron rating, efficiency, working pressure, and temperature, are provided.

7.2.2 Product Numbers

Product numbers for the inlet filter with Rp and NPT connections are listed.

7.3 Flexible Hoses

Flexible hoses provide a safe and taint-free conveyance of potable water. They are WRAS-approved for hot and cold water, offer excellent abrasion and crush resistance, and have good flexibility.

7.3.1 Product Numbers

Product numbers for flexible hose sets are listed.

8. Product Numbers

This section provides detailed product number tables for SCALA1 and SCALA2 models, categorized by voltage, frequency, plug type, country of origin, and specific approvals (SNI, CCC, CSA, ARB).

8.1 SCALA1

Tables list product numbers for various SCALA1 configurations at 50 Hz and 60 Hz.

8.2 SCALA2

Tables list product numbers for SCALA2 configurations at 50/60 Hz.

9. Grundfos Product Center

The Grundfos Product Center is an online tool for searching and sizing products. It provides access to performance curves, technical specifications, diagrams, and documents. Users can select their country to view available products and resources.

Key features include:

• Products & Services: Search by product number or name.
• Applications: Choose an application to design and optimize systems.
• Products A-Z: Browse a list of all Grundfos products.
• Categories: Filter by product category.
• Liquids: Find pumps for specific liquid types.
• Product Replacement: Find suitable replacements.
• WWW: Select country to change language and website structure.
• Sizing: Size products based on application and operating conditions.