Page 9 - Introduction

Don’t leave it to chance, get it right first time, if you think it’s expensive to hire a
professional wait to you count the costs of hiring a amateur.
Contact us on Skype/Phone: +44 (0) 161 8188974, Mobile: +44 (0) 7488298027,
email: paul.mcmullan@subtechengineers.com

Circulating Pumps (glandless)

There are so many glandless circulating pump manufacturers out there they keep bumping into
themselves, it really does not matter which one you chose as the
small domestic heating system pump is designed as a throw away
pump. Glandless circulators are more popular for smaller domestic and
light commercial application as they are compact and quiet. Due to EU
(ErP) regulations we are no longer allowed to use the small three
speed circulator anymore (unless it’s on a domestic hot water,
under floor heating, or thermal solar heating circuit) as its not
energy efficiency, so enter the variable speed circulator, with
permanent magnet motors and on-board
inverters.

As the systems and flows get bigger so do
the pumps, glandless circulators are normally limited by their motor size
and range from 25-100 mm connection sizes, but still fitted with the
permanent magnet motor and on-board inverter, allowing either
automatic setup, proportional pressure, constant pressure, fixed speed and
night mode to be programmed.

Twin head version are available
affording daily alternate start
and duty standby operation.

The bronze version for Sanitary hot water systems,
can still be the old style three speed pump,
but energy efficient versions are also available.

Care needs to be taken When installing glandless circulators, as due to their design the pumped
fluid needs to be able to flow around the shaft and motor to lubricate and cool, as a rule the motor
shaft should be mounted horizontally.