Grundfos GRUNDFOS UPS 15-50 PUMP

• The Grundfos Selectric domestic circulator incorporates an energy saving three speed motor for precise pump to system matching and consequent elimination of hydraulic noise.
• Compact size and standard port to port dimensions for easy fitting and for interchange with old pumps.
• Suitable for all domestic systems upto 120,000btu's/hour.
• The very highest quality pump components provide long life and maximum resistance to corrosion.

UPS 15-50 Selectric and UPS 15-60 Super Selectric circulators are designed to cater for the majority of domestic wet central heating systems up to 35kW. The UPS 15-50 Selectric covers virtually all standard systems whilst the higher head UPS 15-60 can accommodate larger domestic systems and higher resistance circuits (eg microbore). The pumps incorporate a new energy saving three speed motor for pump to system matching and consequent reduction of hydraulic noise. The very highest quality pump components provide long life and maximum resistance to corrosion. Standard port to port dimensions make these pumps interchangeable when replacing the vast majority of old pumps.

INSTALLATION

It is preferable to install Grundfos circulators in a vertical pipe pumping upwards. This position ensures that the pump shaft is horizontal, which reduces the thrust bearing load and ensures positive air purging from both the rotor chamber and impeller housing. Pumping downwards in a vertical pipe is not recommended as this may lead to air locking of the pump, with resultant loss of performance. However, pumping downwards is acceptable provided an effective air vent is incorporated in the system, before the pump.

Where pumps can only be installed in horizontal pipework, it is imperative that the pump shaft is horizontal, or slightly higher at the vent plug end. The shaft must not fall below the horizontal plane, even by a few degrees, as this causes premature wear of the top bearing and shaft. Pumps should not be installed with the shaft in a vertical plane, as this may lead to dry running of the top bearing, noise and possible pump failure. To avoid cavitation noise and risk of damage to the bearings the minimum pump inlet pressure should be 1.4m at 82°C (water temperature).

APPLICATIONS

The pumps may be used in heating systems containing glycol based anti-freeze with corrosion inhibitors up to a maximum of 50% solution but with a 15% performance reduction. However, if the liquid temperature remains lower than the ambient temperature during operation, condensation may form in the stator housing and, may short circuit the motor windings.

FLOW ADJUSTMENT

UPS15-50 -Selectric and UPS15-60 Super Selectric have a three speed selector switch on the terminal box.