4
Application notes – continued
4. Isolation valves
Good plumbing practice is to fit full bore isolating valves into the inlet and outlet pipe work of
the pump to facilitate service and removal of the pump. To install immediately after the stop
tap, the isolation valve should be fitted to the pump outlet. To install before a combi boiler
only, the isolating valve should be fitted to the pump inlet.
5. Holding the CombiBoost during installation
To hold the CombiBoost during installation, spanner flats (24mm) have been provided on the
brass neck outlet. See Figure 1. Any tool used to hold the CombiBoost while the pipework is
connected must be located on the brass portion of the neck to avoid damage to the polymer
pump body.
6. Electrical requirements
The CombiBoost must be connected to the electrical supply using the mains cable with the
attached plug. This plug must be connected to an accessible socket that has been installed in
compliance with IET Wiring Regulations.
The plug must be accessible at all times.
If the supply cord is damaged, it must be replaced by the manufacturer, it’s service agent, or
similarly qualified person in order to avoid a hazard.
All pipe work must be cross-bonded in accordance with the IET Regulations.
CombiBoost is supplied with a 3A fuse fitted. Higher rated fuses MUST NOT be used.
If installed by a Part P qualified installer, the pump may be fitted via a 3A fused mains spur
without invalidating the warranty.
Figure 1: Spanner flats to hold the CombiBoost during installation
110mm
square
175mm inlet to outlet vertical height
195mm overall length
including inlet neck
Spanner flats on brass pump housing
Plastic pump body