Grundfos SCALA2 Variable Speed Constant Pressure System

Grundfos SCALA2 Variable Speed Constant Pressure System

Not Available. Grundfos SCALA2 (98562818) variable speed, constant pressure system. The Grundfos SCALA2 is a fully integrated, self-priming, compact all-in-one water pump for pressure boosting in domestic applications. The unit incorporates the controller, speed controlled drive, tank, sensors and non-return/check valve. The SCALA2 integrated speed control enables perfect water pressure at the taps, meaning that the pump performance will increase with increasing demand. SCALA2 is suitable for houses with up to three floors and eight tapping points. Accurate sizing of the pump can be based on the pump curve below and local norms and standards.


  • Capacity: Up to 17 gpm Maximum
  • Pressure Setting: 80 psi
  • Pressure Adjustment Range: 22 to 80 psi
  • Maximum Inlet Pressure: 87 psi (6 bar)
  • Maximum System Pressure: 145psi (10 bar)
  • Maximum Liquid Temperature: 113 F (45 C)
  • Maximum Ambient Temperature: Continuous operation 113 F
  • Suction Lift: 26 ft (8 m)
  • Connections: 1" NPT
  • Power: 560 Watts Voltage: 115 volts Amps: 5 - 5.7
  • Operating Frequency: 20 to 63 Hz
  • Maximum Amps: 12 Amps
  • Carton Dimensions: 19" L, 10" W, 15" H Shipping
  • Weight: 26 lbs
  • Enclosure Nema Rating: NEMA 3 intended for outdoor use primarily to provide a degree of protection against windblown dust, rain, sleet, and external ice formation. provides protection against falling rain, sleet, snow, and external ice formation. Indoors they protect against dripping water.
  • Built-in system Protection: Dry-running protection.
  • Note: With suction pressures greater than 60psi, a pressure reducing valve must be installed to the suction side of the pump.

Scala2 Warranty

Questions & Answers

What happens if I set the set point too high? For instance, if I set the set point to 5 bar and the pump is lifting liquid from a depth of 8 m?
The pump will operate normally, but show fault indication no 5. When the tap is closed, the pump will stop after approx. 3 minutes and still show fault indication no 5. The pump will start again when a tap is opened, and it will operate at full speed and maximum performance and still show fault indication no 5. If the required outlet pressure is set within the pump, performance range the alarm will be reset automatically.
Why is it possible to set the set point higher than the pump can manage?
You may be interested in raising the pump pressure in installations with a filter on the outlet side and a positive inlet pressure.
Why is SCALA2 limited to 6 bar inlet pressure?
SCALA2 is designed for PN 10, meaning that the pump can withstand 10 bar pressure. SCALA has been tested up to 16 bar inlet pressure. Design standards prescribe that the outlet pressure of a pump must be added to its maximum permissible inlet pressure. This explains why we have chosen to let SCALA operate with a maximum inlet pressure of 6 bar - otherwise the design would be over dimensioned.
Why is it important that the pump is placed horizontally?
A SCALA pump in horizontal position will operate at its optimum. If a SCALA pump is placed vertically with inlet and outlet ports pointing downwards, air may build up inside the cooling jacket. This will not damage the motor, but it may overheat. If a SCALA pump is placed vertically with inlet and outlet ports pointing upwards, it will not handle air very well, and its self-priming capabilities will be reduced. If a SCALA pump is placed up to a 15 degrees; angle in any direction, there is risk of bad cooling and self-priming. But the pump will not be damaged. If a SCALA pump is placed at more than a 15 degrees; angle in any direction, there is risk of strongly reduced functionality and lifetime as well as damage to the pump.
Why do I need to prime the pump more than once?
If the suction lift is higher than 6 m, or 20 feet, the pump may need to be primed more than once.
Why does the pump indicate alarm if the inlet pressure is too high?
This may be an indication that there is a fault in the installation that may cause damage to the pump. The pressure limit is 6 bar. The alarm will be reset automatically when the inlet pressure is again below the pressure limit. Alarm indication no 5.
Why does the pump lose speed at regular intervals, for instance, every second minute?
This is the low-flow stop test function, which measures the flow in order to stop the pump when there is low or no flow.
Why does the pump not stop immediately when I close the tap?
The pump needs to fill the pressure tank; therefore, it will typically run for 5-8 seconds after you closed the tap. If there is more than one pressure tank in the installation, the after-run time may be longer. If you close the tap very slowly, the pump will not detect any change in pressure, and it may take up to 115 seconds until the pump detects that there is no flow and stops.
The pump seems to be running at full speed when it is operating?
The reason for this may be that the pressure tank is larger than 50 liters. The reason may also be that the pump is running on its maximum curve (see question no 1).
Can two SCALA pumps run in parallel?
No, we do not recommend that. Buy a system that is suitable for parallel operation, such as a Hydro Multi-E.
Can two SCALA pumps run in series?
No, we do not recommend that. Two controlled pumps in series will typically work against each other. However, it will be fine to install a fixed-speed pump as feed pump for SCALA2.
Is it possible to communicate with SCALA?
No, neither wireless nor wired communication is possible.
Is there a service tool (PC Tool) for SCALA?
No. However, it is clearly indicated when a SCALA pump must be replaced, and that is when the Grundfos Eye is showing permanent red light.
Why are vibrations transferred to pipes and walls when the pump is running?
The pump is not installed correctly, which is the reason why vibrations are transferred to the pipe system. See the installation section.
It seems that the pump starts up slowly?
As the motor is speed controlled, it has been designed to start slowly. But motor, controller and pressure tank are adjusted to each other, meaning that the pump will supply water before the tank is empty, which again means that the customer will not experience loss of pressure.
The customer experiences water splashes when he opens the tap?
The tap is either too big or it has been opened too quickly. The pump is dimension to handle the opening of a ; inch tap in approx. one second. The pump is designed for normal household installations with normal tapping points, and they should not normally cause any problems.
Water is seeping out underneath the pump?
There can be two reasons: 1: The typical reason is condensation. This cannot be eliminated, but we recommend that you install the pump in a drip tray or close to a floor drain. 2: Another reason can be leakage from the shaft seal. The shaft seal will leak during the running-in period, but this should stop after three hours; continuous operation or after normal operation for a week. Normally, the leakage from the shaft seal will be so small that the water will evaporate. If the leakage is more than one drop per minute, there is fault in the shaft seal (or the pump is still being run in).
Why does it take five minutes from I turn off the water supply to the pump till the pump stops with dry-running alarm?
The pump distinguishes between a water-filled pump and a dry pump. A water-filled pump will run for a while in order to try to fill up the inlet line, and it will try to restart automatically. A dry pump will stop immediately as otherwise the shaft seal will be destroyed within a few minutes, and it must be restarted manually.
Why do I have to restart the pump manually after dry-running?
There can be two answers: 1: Automatic reset has been deactivated in advanced settings. 2: The pump has not been primed.
What happens if the pump is exposed to a higher supply voltage than stated on the nameplate?
Nothing will happen. The Grundfos Motor Drive Software (GMDS) will stop the pump if the voltage is too high. In special situations with extreme noise, voltage spikes, swells, ring waves or other network phenomena, the GMDS will try to limit the problem and keep the pump running at reduced performance.
What happens if the pump is exposed to a lower supply voltage than stated on the nameplate?
Depending on the cause of the low voltage, the pump will continue running at limited performance until the minimum voltage reaches 75 V (115 V version) and 150 V (230 V version, respectively, where the pump will indicate alarm and stop. In case of long voltage supply lines, low network impedance and/or operation via diesel generator, the network may collapse because an unloaded voltage measurement of the network will show high voltage but no available energy. In this case, it may be a good idea to operate the product at a low set point. GMDS will try to keep the pump running even if the voltage supply collapses.
Where is the low-flow stop limit? And what happens on either side of the flow-flow stop limit?
App. 1.5 L/min. above the low-flow stop limit, the pump will run constant pressure. Below the low-flow stop limit, the pump will stop and occasionally start and fill the built-in pressure tank in order to maintain the required outlet pressure.
At which temperature will the frost protection be activated?
Frost protection is activated at 3 C and is deactivated again at 3 C higher temperature.
What triggers leakage indication/anti cycling (indicator light 3)?
Leakage indication or anti cycling are triggered by low flow when the pump is running in start/stop operation with the same interval between stops and starts. The alarm is triggered by an integrated counter counting up to 40 cycles with the same interval between stop and start. The counter has a 5-second tolerance. The counter counts up when the interval is the same as the previous one and down when the interval differs from the previous one.
What happens when anti cycling is enabled and there is a leak in the system?
Anti cycling disabled (default setting) => the pump will run as normal and indicator light no. 3 will light up. Anti-cycling enabled => the pump will stop and indicator light no. 3 will light up.
How does the SCALA automatic reset sequence function?
The auto reset sequence is three restarts within the first 60 seconds counting from the first restart attempt followed by eight restarts at 5-minute intervals followed again by one reset after 24 hours.
What is the low-flow stop limit?
1 - 1.5 liters per minute. This is to minimize the number of starts and to avoid heating the water in case of low flow.
Are we able to trace the products by unique numbers?
Yes. Each pump will have a unique serial number. However, this will not be visible on the box.
What kind of motor does SCALA2 incorporate?
A high-efficiency, water-cooled, permanent-magnet motor with speed control. P1 max.= 550 W.
What does IP rating mean?
Approved for outdoor installation.
Are there Factory Product Variants (FPV) available?

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