Grundfos SCALA Installation and Operating Instructions
1. General Information
These installation and operating instructions describe the Grundfos SCALA domestic water supply pumps. Sections 1-4 provide essential information for safe unpacking, installation, and startup. Sections 5-14 offer important details on product service, fault finding, and disposal.
1.1 Target Group
These instructions are intended for professional installers.
1.2 Symbols Used in this Document
- Warning: Indicates potential personal injury if safety instructions are not observed.
- Caution: Indicates potential electric shock risk, leading to serious personal injury or death if instructions are not followed.
- Caution: Indicates potential malfunction or damage to equipment if safety instructions are not observed.
- Note: Provides helpful tips for easier job execution and safe operation.
2. Receiving the Product
2.1 Inspecting the Product
Verify that the received product matches the order. Ensure the product's voltage and frequency match the installation site's specifications (refer to section 6.4.1 Nameplate).
2.2 Scope of Delivery
The package includes:
- 1 Grundfos SCALA pump
- 1 quick guide
- 1 safety instructions booklet
3. Installing the Product
3.1 Location
The pump can be installed indoors or outdoors but must be protected from frost. It is recommended to install the pump near a drain or in a drip tray to manage condensation.
3.1.1 Minimum Space
The pump requires a minimum space of 430 x 215 x 325 mm (17 x 8.5 x 12.8 inches) for installation and maintenance access.
3.1.2 Installing in Frosty Environment
If installed outdoors where frost is possible, enclose the pump in insulating material.
3.2 System Sizing
Warning: The system must be designed for the maximum pump pressure. The pump is factory-set to three bar outlet pressure, adjustable to system needs. The tank precharge pressure is 1.25 bar (18 psi).
3.3 Mechanical Installation
Warning: Ensure the power supply is switched off and cannot be accidentally switched on before performing any work.
3.4 Foundation
Fasten the pump to a solid horizontal foundation using the base plate holes. Ensure the pump is not stressed by the pipework. Use the provided flexible connections (± 5°) for inlet and outlet pipes. Loosen and tighten union nuts by hand.
3.4.1 Pipework
Connect inlet and outlet pipes using flexible connections. Ensure connections are hand-tightened.
3.4.2 Reducing Noise
To minimize vibration transfer and noise, use a vibration-damping rubber pad, flexible hoses, and correctly placed pipe hangers for rigid pipes. Place pipe hangers close to the flexible hose connections.
3.5 Installation Examples
Fittings, hoses, and valves are not supplied with the pump.
3.5.1 Mains Water Pressure Boosting
Illustrates a typical mains water pressure boosting setup, including inlet pipe submersion, isolating valves, flexible hoses, bypass valve, optional pressure-reducing valve, optional pressure-relief valve, drip tray, and pressure gauge.
3.5.2 Suction from a Well
Details a well suction setup, including highest tapping point, isolating valve, inlet filter (recommended if water contains debris), and foot valve with strainer. Maximum suction lift is 8 m (29 ft).
3.5.3 Suction from Freshwater Tank
Shows a freshwater tank suction setup, including highest tapping point, pipe hangers, isolating valves, flexible hoses, drain to sewer, and foot valve with strainer.
3.6 Suction Pipe Length
Provides a guide for different possible pipe lengths based on vertical pipe length for DN 32 and DN 40 pipes. Includes preconditions for maximum flow velocity and pipe roughness.
3.7 Electrical Connection
3.7.1 Plug Connection
Warning: Ensure the voltage and frequency match the installation site. If the power supply cable is damaged, it must be replaced by the manufacturer or a qualified service agent. The product must be connected to a socket with earth connection. An earth leakage circuit breaker (ELCB) with a tripping current < 30 mA is recommended.
3.7.2 Connections without Plug
Warning: Electrical connections must be performed by an authorized electrician according to local regulations. Ensure the power supply is switched off and cannot be accidentally switched on. Connect to an external mains switch with a contact gap of at least 3 mm in all poles.
4. Starting Up the Product
Caution: Do not start the pump until it has been filled with liquid.
4.1 Priming the Pump
Unscrew the priming plug and fill the pump housing with at least 1.7 litres (0.45 gallons) of water. Screw the priming plug back on. Note: If suction depth exceeds 6 m (20 ft), priming may need to be repeated. Always tighten priming and drain plugs by hand.
4.2 Starting the Pump
- Open a tap to prepare for venting.
- Insert the power plug or turn on the power supply. The pump will start automatically.
- Close the tap when water flows without air.
- Open the highest tapping point (e.g., a shower).
- Adjust the pressure using the '+' and '-' buttons.
- Close the tapping point. Startup is complete.
4.3 Shaft Seal Run-in
The shaft seal faces are lubricated by the pumped liquid. A run-in period is required for the leakage to stabilize. Under normal conditions, any leakage will evaporate. No leakage should be detected.
5. Storing and Handling the Product
5.1 Handling
Caution: Handle the pump carefully to prevent breakage.
5.2 Storing
If the pump is to be stored, drain it and keep it in a dry location. The storage temperature range is -40 to 70 °C (-104 to 158 °F).
5.3 Winterizing
If the pump will be out of operation during winter and exposed to frost, disconnect it from the power supply and winterize it. Follow these steps: stop the pump, disconnect power, open a tap to release pressure, close isolating valves and drain pipes, gradually loosen the priming plug to release pressure, and remove the drain plug to drain the pump.
5.3.1 Startup after Winter
Check for blockages by following steps in section 9.1 Deblocking the pump. Refer to section 4 for startup procedures.
6. Product Introduction
6.1 Product Description
Diagram showing the Grundfos SCALA pump with numbered parts: 1. Air valve, 2. Operating panel, 3. Nameplate, 4. Plug for pump shaft access, 5. Priming plug, 6. Outlet opening, 7. Inlet opening, 8. Drain plug, 9. Ventilation holes.
6.2 Application
The pump is suitable for pressure boosting of fresh water in domestic water supply systems.
6.3 Pumped Liquids
The pump is designed for clean fresh water and chlorinated water < 300 ppm.
6.4 Identification
6.4.1 Nameplate
Diagram of the nameplate with numbered descriptions: 1. Type designation, 2. Product number, 3. Serial number, 4. Production code, 5. Maximum head, 6. Minimum head, 7. Rated head, 8. Rated flow rate, 9. Maximum ambient temperature, 10. IP class, 11. Maximum operation pressure, 12. Maximum liquid temperature, 13. Minimum and maximum rated power, 14. Model, 15. Voltage and frequency, 16. Approvals, 17. Minimum and maximum rated current.
6.4.2 Type Key
Explains the type designation for SCALA pumps, including type range, model, supply voltage, motor type, mains cable and plug options, controller type, and thread type.
7. Control Functions
7.1 Menu Overview, SCALA2
Diagram of the SCALA2 operating panel with buttons for On/Off, Increase/Decrease pressure, Reset, and Stop. Includes indicators for required outlet pressure, manual stop, and panel lock.
7.1.1 Pressure Indicator, SCALA2
The pressure indicator shows the required outlet pressure from 1.5 to 5.5 bar (22 to 80 psi) in 0.5 bar (7.5 psi) intervals. Illustrations show pumps set to 3 bar (44 psi) and 3.5 bar (51 psi).
7.1.2 Indicator Lights, SCALA2
Details the meaning of various indicator lights:
- Operating indications:
- The operating panel is locked.
- Power supply failure.
- The pump is blocked (e.g., shaft seal seized).
- Leakage in the system.
- Dry-running or water shortage.
- The maximum pressure has been exceeded.
- The maximum runtime has been exceeded.
- The temperature is outside the range.
*For fault number 4 (dry-running), the pump attempts automatic resets. For other faults (1, 2, 3, 5, 6, 7), the pump resets when the cause is remedied.
8. Operating the Controller
8.1 Setting the Outlet Pressure
Adjust the outlet pressure by pressing the '+' and '-' buttons.
8.2 Locking and Unlocking the Operating Panel
The operating panel can be locked to prevent accidental changes. To lock, hold down the '+' and '-' buttons simultaneously for three seconds. The panel is locked when the 'lock' symbol lights up. To unlock, repeat the process; the panel is unlocked when the 'lock' symbol turns off.
8.3 Expert Settings, SCALA2
Note: Expert settings are for installers only. This menu allows toggling between auto reset, anti-cycling, and maximum continuous operating time.
- Auto reset: Automatically resets alarms when conditions normalize.
- Anti-cycling: Monitors pump starts/stops to prevent frequent cycling, indicating a potential system leakage (alarm 3).
- Maximum continuous operating time: Limits continuous operation to 30 minutes to prevent overheating (alarm 6).
8.3.1 Accessing the Expert Settings
Hold the Reset button for five seconds. The 'expert' symbol flashes, indicating active settings. Use the '+' and '-' buttons to navigate and the Reset button to toggle settings.
8.4 Resetting to Factory Settings
Press the '+' and '-' buttons simultaneously for five seconds to reset to factory settings.
9. Starting Up the Product After Shutdown or Standstill
9.1 Deblocking the Pump
Warning: Ensure the power supply is switched off. The end cover has a plug that can be removed to deblock the pump shaft if it has seized due to inactivity.
9.2 Controller Settings
Controller settings are retained even when the pump is turned off.
9.3 Priming
If the pump has been drained, it must be filled with liquid before startup (see section 4).
10. Servicing the Product
Warning: Ensure the power supply is switched off before performing any work.
10.1 Maintaining the Product
10.1.1 Insect Filter
An insect filter prevents insects from nesting. It is located at the bottom and can be removed and cleaned annually or as needed.
10.1.2 Inlet and Outlet Valves
The pump is maintenance-free. Check and clean the inlet and outlet non-return valves annually or as needed.
To remove the outlet non-return valve: Turn off power, shut off water, release pressure, close isolating valves, drain pipes, gradually open the priming plug (pos. 5), clean the non-return valve with water and a soft brush, and reassemble.
To remove the inlet non-return valve: Turn off power, shut off water, release pressure, close isolating valves, drain pipes, remove priming plug (pos. 5), remove drain plug (pos. 8), unscrew union nut (pos. 7), pull out inlet connection, pull out inlet non-return valve, clean with water and a soft brush, and reassemble.
10.2 Customer Service Information
For information on service parts, visit the Grundfos Product Center at www.product-selection.grundfos.com.
10.3 Service Kits
Information on service kits is available at the Grundfos Product Center on www.grundfos.com.
11. Taking Out of Operation
For information on taking the product out of operation, refer to end-of-life documentation on www.grundfos.com.
12. Fault Finding the Product
12.1 Grundfos Eye Operating Indications
Provides a guide to the Grundfos Eye indicators and their meanings:
- No lights on: Power off, pump not running.
- Two opposite green lights rotating: Power on, pump running.
- Two opposite green lights at 45° angle: Power on, pump running.
- Two opposite green lights permanently on: Power on, pump not running.
- Two opposite red lights flashing: Alarm, pump stopped.
- Two opposite red lights on: Alarm, pump stopped.
12.2 Fault Resetting
Fault indications can be reset manually by pressing the Reset button after the fault cause is eliminated. The pump will attempt automatic reset if the fault disappears.
13. Fault Finding Chart
Warning: Switch off power before fault finding.
| Fault | Grundfos Eye | Indicator Light | Automatic Reset | Cause | Remedy |
|---|---|---|---|---|---|
| 1. The pump is not running. | No lights on |
- | No | a) Power supply failure | Switch on power supply. Check cables, connections, and fuses. |
| b) Power supply voltage out of range | Check power supply and nameplate. Reestablish correct voltage range. | ||||
| No | c) Shaft seal seized up | See section 9. Contact Grundfos Service if problem persists. | |||
| No | d) Pump blocked by impurities | See section 9. Contact Grundfos Service if problem persists. | |||
| Yes | e) Dry running | Check water source and prime pump. | |||
| No | f) Maximum runtime exceeded | Check installation for leakage and reset alarm. | |||
| No | g) Internal non-return valve defective or blocked | Clean, repair, or replace non-return valve. See section 10. | |||
| 2. The pump is running. | Two opposite green lights rotating Two opposite green lights at 45° angle |
- | - | a) Leakage in pipework or non-return valve not closed | Check and repair pipework, or clean/replace non-return valve. |
| - | b) Small continuous consumption | Check taps and reconsider usage pattern. | |||
| - | c) Temperature below freezing | Protect installation against frost. | |||
| 3. Pump performance is insufficient. | Two opposite green lights permanently on |
- | - | a) Pump inlet pressure too low | Check inlet conditions. |
| - | b) Pump is undersized | Replace with a larger pump. | |||
| - | c) Inlet pipe, strainer, or pump partially blocked | Clean inlet pipe or pump. | |||
| - | d) Leakage in inlet pipe | Repair inlet pipe. | |||
| - | e) Air in inlet pipe or pump | Prime inlet pipe and pump. | |||
| - | f) Required outlet pressure too low | Increase pressure setting. | |||
| Yes | g) Maximum temperature exceeded | Check cooling conditions. Protect pump from direct sunlight or heat sources. | |||
| 4. System overpressure. | Two opposite red lights flashing Two opposite red lights on |
Yes | a) Maximum pressure exceeded (inlet pressure > 6 bar) | Check inlet conditions. | |
| Yes | b) System causes high pressure (e.g., water heater) | Check installation. | |||
| 5. The pump can be reset, but runs only for a few seconds. | Two opposite red lights flashing |
Yes | a) Dry running or water shortage | Check water source and prime pump. | |
| Yes | b) Inlet pipe blocked by impurities | Clean inlet pipe. | |||
| Yes | c) Foot or non-return valve blocked | Clean, repair, or replace foot or non-return valve. | |||
| 6. The pump can be reset, but starts repeatedly after stopping. | Two opposite red lights flashing |
Yes | d) Leakage in inlet pipe | Repair inlet pipe. | |
| Yes | e) Air in inlet pipe or pump | Prime inlet pipe and pump. Check inlet conditions. | |||
| No | a) Internal non-return valve defective or blocked | Clean, repair, or replace non-return valve. | |||
| No | b) Tank precharge pressure incorrect | Adjust tank precharge pressure to 70% of required outlet pressure. |
13. Technical Data
13.1 Operating Conditions
- Maximum ambient temperature: 45 °C (113 °F)
- Maximum liquid temperature: 55 °C (131 °F)
- Maximum system pressure: 10 bar (145 psi)
- Maximum inlet pressure: 6 bar (85 psi)
- Maximum head: 45 m (147 ft)
- IP rating: IPX4D (outdoor installation)
- Pumped liquid: Clean water
- Noise level: < 45 dB(A)
13.2 Mechanical Data
Pipe connections are R 1" or NPT 1".
13.3 Electrical Data
Provides a table detailing supply voltage, frequency, maximum current, power consumption, and stand-by power for different SCALA2 models. Also lists available mains cable and plug types.
13.3.1 Dimensions and Weights
Table showing dimensions (H1, H2, H3, L1, W1) and weight for the SCALA2 pump in mm/inches and kg/lbs.
14. Disposal
This product is designed for disposal and recycling. Minimum 85% recycling, maximum 10% incineration, and maximum 5% depositing. Dispose of the product or its parts in an environmentally sound manner according to local regulations.
Grundfos Companies
Lists Grundfos companies worldwide with contact information for various countries.
