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UPS 15-50 Selectric and UPS 15-60 Super Selectric circulators aredesigned to cater for the majority of domestic wet central heatingsystems up to 35kW.The UPS 15-50 Selectric covers virtually all standard systems whilstthe higher head UPS 15-60 can accommodate larger domestic systemsand higher resistance circuits (eg microbore).The pumps incorporate a new energy saving three speed motor forpump to system matching and consequent reduction of hydraulic noise.The very highest quality pump components provide long life andmaximum resistance to corrosion. Standard port to port dimensionsmake these pumps interchangeable when replacing the vast majorityof old pumps.
INSTALLATION
It is preferable to install Grundfos circulators in a vertical pipepumping upwards. This position ensures that the pump shaftis horizontal, which reduces the thrust bearing load and ensurespositive air purging from both the rotor chamber and impellerhousing.Pumping downwards in a vertical pipe is not recommended asthis may lead to air locking of the pump, with resultant loss ofperformance. However, pumping downwards is acceptableprovided an effective air vent is incorporated in the system,before the pump.
Where pumps can only be installed in horizontal pipework, it isimperative that the pump shaft is horizontal, or slightly higherat the vent plug end.The shaft must not fall below the horizontal plane, even by afew degrees, as this causes premature wear of the top bearingand 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 andpossible pump failure.To avoid cavitation noise and risk of damage to the bearings theminimum pump inlet pressure should be 1.4m at 82°C (watertemperature).
APPLICATIONS
The pumps may be used in heating systems containing glycolbased anti-freeze with corrosion inhibitors up to a maximumof 50% solution but with a 15% performance reduction.However, if the liquid temperature remains lower than theambient temperature during operation, condensation may form inthe stator housing and, may short circuit the motor windings.
FLOW ADJUSTMENT
UPS15-50 -Selectric and UPS15-60 Super Selectric have a threespeed selector switch on the terminal box.